调用webservice

WebClient web = new WebClient();
Stream stream = web.OpenRead(this._wsdlUrl);

//Stream streamInfo = new WebClient().OpenRead(InterfacePath + "/" + interfaceName + "?" + paramStr);

StreamReader streamReader = new StreamReader(stream, Encoding.UTF8);
var result = streamReader.ReadToEnd();

 转：http://www.cnblogs.com/eagle1986/archive/2012/09/03/2669699.html

调用webserivice 最简单的方法就是在 "引用"  那里点击右键，然后选择"引用web服务"，再输入服务地址。

确定后，会生成一个app.config 里面就会自动生成了一些配置信息

 webservice 代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

namespace TestWebService
{
    /// <summary>
    /// Service1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/",Description="我的Web服务")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
    // [System.Web.Script.Services.ScriptService]
    public class TestWebService : System.Web.Services.WebService
    {

        [WebMethod]
        public string HelloWorld()
        {
            return "测试Hello World";
        }

        [WebMethod]
        public string Test()
        {
            return "测试Test";
        }
      
        [WebMethod(CacheDuration = 60,Description = "测试")]
        public List<String> GetPersons()
        {
            List<String> list = new List<string>();
            list.Add("测试一");
            list.Add("测试二");
            list.Add("测试三");
            return list;
        }  

    }

}

动态调用示例：

方法一：

看到很多动态调用WebService都只是动态调用地址而已，下面发一个不光是根据地址调用，方法名也可以自己指定的,主要原理是根据指定的WebService地址的WSDL,然后解析模拟生成一个代理类,通过反射调用里面的方法 

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.Web;
using System.Net;
using System.Reflection;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Web.Services;
using System.Text;
using System.Web.Services.Description;
using System.Web.Services.Protocols;
using System.Xml.Serialization;
using System.Windows.Forms;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            WebClient client = new WebClient();
            String url = "http://localhost:3182/Service1.asmx?WSDL";//这个地址可以写在Config文件里面，这里取出来就行了.在原地址后面加上： ?WSDL
            Stream stream = client.OpenRead(url);
            ServiceDescription description = ServiceDescription.Read(stream);

            ServiceDescriptionImporter importer = new ServiceDescriptionImporter();//创建客户端代理代理类。

            importer.ProtocolName = "Soap"; //指定访问协议。
            importer.Style = ServiceDescriptionImportStyle.Client; //生成客户端代理。
            importer.CodeGenerationOptions = CodeGenerationOptions.GenerateProperties | CodeGenerationOptions.GenerateNewAsync;

            importer.AddServiceDescription(description, null, null); //添加WSDL文档。

            CodeNamespace nmspace = new CodeNamespace(); //命名空间
            nmspace.Name = "TestWebService";
            CodeCompileUnit unit = new CodeCompileUnit();
            unit.Namespaces.Add(nmspace);

            ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit);
            CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");

            CompilerParameters parameter = new CompilerParameters();
            parameter.GenerateExecutable = false;
            parameter.OutputAssembly = "MyTest.dll";//输出程序集的名称
            parameter.ReferencedAssemblies.Add("System.dll");
            parameter.ReferencedAssemblies.Add("System.XML.dll");
            parameter.ReferencedAssemblies.Add("System.Web.Services.dll");
            parameter.ReferencedAssemblies.Add("System.Data.dll");

            CompilerResults result = provider.CompileAssemblyFromDom(parameter, unit);
            if (result.Errors.HasErrors)
            {
                // 显示编译错误信息
            }

            Assembly asm = Assembly.LoadFrom("MyTest.dll");//加载前面生成的程序集
            Type t = asm.GetType("TestWebService.TestWebService");

            object o = Activator.CreateInstance(t);
            MethodInfo method = t.GetMethod("GetPersons");//GetPersons是服务端的方法名称,你想调用服务端的什么方法都可以在这里改,最好封装一下

            String[] item = (String[])method.Invoke(o, null);
            //注：method.Invoke(o, null)返回的是一个Object,如果你服务端返回的是DataSet,这里也是用(DataSet)method.Invoke(o, null)转一下就行了,method.Invoke(0,null)这里的null可以传调用方法需要的参数,string[]形式的
            foreach (string str in item)
                Console.WriteLine(str);

            //上面是根据WebService地址，模似生成一个代理类,如果你想看看生成的代码文件是什么样子，可以用以下代码保存下来，默认是保存在bin目录下面
            TextWriter writer = File.CreateText("MyTest.cs"); 
            provider.GenerateCodeFromCompileUnit(unit, writer, null);
            writer.Flush();
            writer.Close();
        } 
    }
}

在网上找了一个更为详细的

http://blog.csdn.net/ysq5202121/article/details/6942813

方法二：利用 wsdl.exe生成webservice代理类:

根据提供的wsdl生成webservice代理类，然后在代码里引用这个类文件。

步骤：1、在开始菜单找到  Microsoft Visual Studio 2010 下面的Visual Studio Tools ， 点击Visual Studio 命令提示(2010)，打开命令行。

          2、 在命令行中输入：  wsdl /language:c# /n:TestDemo /out:d:/Temp/TestService.cs http://jm1.services.gmcc.net/ad/Services/AD.asmx?wsdl

                这句命令行的意思是：对最后面的服务地址进行编译，在D盘temp 目录下生成testservice文件。

          3、 把上面命令编译后的cs文件，复制到我们项目中，在项目代码中可以直接new 一个出来后，可以进行调用。

   贴出由命令行编译出来的代码：

//------------------------------------------------------------------------------
// <auto-generated>
//     此代码由工具生成。
//     运行时版本:4.0.30319.225
//
//     对此文件的更改可能会导致不正确的行为，并且如果
//     重新生成代码，这些更改将会丢失。
// </auto-generated>
//------------------------------------------------------------------------------

// 
// 此源代码由 wsdl 自动生成, Version=4.0.30319.1。
// 
namespace Bingosoft.Module.SurveyQuestionnaire.DAL {
    using System;
    using System.Diagnostics;
    using System.Xml.Serialization;
    using System.ComponentModel;
    using System.Web.Services.Protocols;
    using System.Web.Services;
    using System.Data;
    
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Web.Services.WebServiceBindingAttribute(Name="WebserviceForILookSoap", Namespace="http://tempuri.org/")]
    public partial class WebserviceForILook : System.Web.Services.Protocols.SoapHttpClientProtocol {
        
        private System.Threading.SendOrPostCallback GetRecordNumOperationCompleted;
        
        private System.Threading.SendOrPostCallback GetVoteListOperationCompleted;
        
        private System.Threading.SendOrPostCallback VoteOperationCompleted;
        
        private System.Threading.SendOrPostCallback GiveUpOperationCompleted;
        
        private System.Threading.SendOrPostCallback GetQuestionTaskListOperationCompleted;
        
        /// <remarks/>
        public WebserviceForILook() {
            this.Url = "http://st1.services.gmcc.net/qnaire/Services/WebserviceForILook.asmx";
        }
        
        /// <remarks/>
        public event GetRecordNumCompletedEventHandler GetRecordNumCompleted;
        
        /// <remarks/>
        public event GetVoteListCompletedEventHandler GetVoteListCompleted;
        
        /// <remarks/>
        public event VoteCompletedEventHandler VoteCompleted;
        
        /// <remarks/>
        public event GiveUpCompletedEventHandler GiveUpCompleted;
        
        /// <remarks/>
        public event GetQuestionTaskListCompletedEventHandler GetQuestionTaskListCompleted;
        
        /// <remarks/>
        [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/GetRecordNum", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
        public int[] GetRecordNum(string appcode, string userID) {
            object[] results = this.Invoke("GetRecordNum", new object[] {
                        appcode,
                        userID});
            return ((int[])(results[0]));
        }
        
        /// <remarks/>
        public System.IAsyncResult BeginGetRecordNum(string appcode, string userID, System.AsyncCallback callback, object asyncState) {
            return this.BeginInvoke("GetRecordNum", new object[] {
                        appcode,
                        userID}, callback, asyncState);
        }
        
        /// <remarks/>
        public int[] EndGetRecordNum(System.IAsyncResult asyncResult) {
            object[] results = this.EndInvoke(asyncResult);
            return ((int[])(results[0]));
        }
        
        /// <remarks/>
        public void GetRecordNumAsync(string appcode, string userID) {
            this.GetRecordNumAsync(appcode, userID, null);
        }
        
        /// <remarks/>
        public void GetRecordNumAsync(string appcode, string userID, object userState) {
            if ((this.GetRecordNumOperationCompleted == null)) {
                this.GetRecordNumOperationCompleted = new System.Threading.SendOrPostCallback(this.OnGetRecordNumOperationCompleted);
            }
            this.InvokeAsync("GetRecordNum", new object[] {
                        appcode,
                        userID}, this.GetRecordNumOperationCompleted, userState);
        }
        
        private void OnGetRecordNumOperationCompleted(object arg) {
            if ((this.GetRecordNumCompleted != null)) {
                System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
                this.GetRecordNumCompleted(this, new GetRecordNumCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
            }
        }
        
        /// <remarks/>
        [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/GetVoteList", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
        public System.Data.DataSet GetVoteList(string appcode, string userID) {
            object[] results = this.Invoke("GetVoteList", new object[] {
                        appcode,
                        userID});
            return ((System.Data.DataSet)(results[0]));
        }
        
        /// <remarks/>
        public System.IAsyncResult BeginGetVoteList(string appcode, string userID, System.AsyncCallback callback, object asyncState) {
            return this.BeginInvoke("GetVoteList", new object[] {
                        appcode,
                        userID}, callback, asyncState);
        }
        
        /// <remarks/>
        public System.Data.DataSet EndGetVoteList(System.IAsyncResult asyncResult) {
            object[] results = this.EndInvoke(asyncResult);
            return ((System.Data.DataSet)(results[0]));
        }
        
        /// <remarks/>
        public void GetVoteListAsync(string appcode, string userID) {
            this.GetVoteListAsync(appcode, userID, null);
        }
        
        /// <remarks/>
        public void GetVoteListAsync(string appcode, string userID, object userState) {
            if ((this.GetVoteListOperationCompleted == null)) {
                this.GetVoteListOperationCompleted = new System.Threading.SendOrPostCallback(this.OnGetVoteListOperationCompleted);
            }
            this.InvokeAsync("GetVoteList", new object[] {
                        appcode,
                        userID}, this.GetVoteListOperationCompleted, userState);
        }
        
        private void OnGetVoteListOperationCompleted(object arg) {
            if ((this.GetVoteListCompleted != null)) {
                System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
                this.GetVoteListCompleted(this, new GetVoteListCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
            }
        }
        
        /// <remarks/>
        [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/Vote", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
        public bool Vote(string appcode, string userID, string qTaskID, string answer) {
            object[] results = this.Invoke("Vote", new object[] {
                        appcode,
                        userID,
                        qTaskID,
                        answer});
            return ((bool)(results[0]));
        }
        
        /// <remarks/>
        public System.IAsyncResult BeginVote(string appcode, string userID, string qTaskID, string answer, System.AsyncCallback callback, object asyncState) {
            return this.BeginInvoke("Vote", new object[] {
                        appcode,
                        userID,
                        qTaskID,
                        answer}, callback, asyncState);
        }
        
        /// <remarks/>
        public bool EndVote(System.IAsyncResult asyncResult) {
            object[] results = this.EndInvoke(asyncResult);
            return ((bool)(results[0]));
        }
        
        /// <remarks/>
        public void VoteAsync(string appcode, string userID, string qTaskID, string answer) {
            this.VoteAsync(appcode, userID, qTaskID, answer, null);
        }
        
        /// <remarks/>
        public void VoteAsync(string appcode, string userID, string qTaskID, string answer, object userState) {
            if ((this.VoteOperationCompleted == null)) {
                this.VoteOperationCompleted = new System.Threading.SendOrPostCallback(this.OnVoteOperationCompleted);
            }
            this.InvokeAsync("Vote", new object[] {
                        appcode,
                        userID,
                        qTaskID,
                        answer}, this.VoteOperationCompleted, userState);
        }
        
        private void OnVoteOperationCompleted(object arg) {
            if ((this.VoteCompleted != null)) {
                System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
                this.VoteCompleted(this, new VoteCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
            }
        }
        
        /// <remarks/>
        [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/GiveUp", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
        public bool GiveUp(string appcode, string userID, string qTaskID) {
            object[] results = this.Invoke("GiveUp", new object[] {
                        appcode,
                        userID,
                        qTaskID});
            return ((bool)(results[0]));
        }
        
        /// <remarks/>
        public System.IAsyncResult BeginGiveUp(string appcode, string userID, string qTaskID, System.AsyncCallback callback, object asyncState) {
            return this.BeginInvoke("GiveUp", new object[] {
                        appcode,
                        userID,
                        qTaskID}, callback, asyncState);
        }
        
        /// <remarks/>
        public bool EndGiveUp(System.IAsyncResult asyncResult) {
            object[] results = this.EndInvoke(asyncResult);
            return ((bool)(results[0]));
        }
        
        /// <remarks/>
        public void GiveUpAsync(string appcode, string userID, string qTaskID) {
            this.GiveUpAsync(appcode, userID, qTaskID, null);
        }
        
        /// <remarks/>
        public void GiveUpAsync(string appcode, string userID, string qTaskID, object userState) {
            if ((this.GiveUpOperationCompleted == null)) {
                this.GiveUpOperationCompleted = new System.Threading.SendOrPostCallback(this.OnGiveUpOperationCompleted);
            }
            this.InvokeAsync("GiveUp", new object[] {
                        appcode,
                        userID,
                        qTaskID}, this.GiveUpOperationCompleted, userState);
        }
        
        private void OnGiveUpOperationCompleted(object arg) {
            if ((this.GiveUpCompleted != null)) {
                System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
                this.GiveUpCompleted(this, new GiveUpCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
            }
        }
        
        /// <remarks/>
        [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/GetQuestionTaskList", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
        public System.Data.DataSet GetQuestionTaskList(string appcode, string userID) {
            object[] results = this.Invoke("GetQuestionTaskList", new object[] {
                        appcode,
                        userID});
            return ((System.Data.DataSet)(results[0]));
        }
        
        /// <remarks/>
        public System.IAsyncResult BeginGetQuestionTaskList(string appcode, string userID, System.AsyncCallback callback, object asyncState) {
            return this.BeginInvoke("GetQuestionTaskList", new object[] {
                        appcode,
                        userID}, callback, asyncState);
        }
        
        /// <remarks/>
        public System.Data.DataSet EndGetQuestionTaskList(System.IAsyncResult asyncResult) {
            object[] results = this.EndInvoke(asyncResult);
            return ((System.Data.DataSet)(results[0]));
        }
        
        /// <remarks/>
        public void GetQuestionTaskListAsync(string appcode, string userID) {
            this.GetQuestionTaskListAsync(appcode, userID, null);
        }
        
        /// <remarks/>
        public void GetQuestionTaskListAsync(string appcode, string userID, object userState) {
            if ((this.GetQuestionTaskListOperationCompleted == null)) {
                this.GetQuestionTaskListOperationCompleted = new System.Threading.SendOrPostCallback(this.OnGetQuestionTaskListOperationCompleted);
            }
            this.InvokeAsync("GetQuestionTaskList", new object[] {
                        appcode,
                        userID}, this.GetQuestionTaskListOperationCompleted, userState);
        }
        
        private void OnGetQuestionTaskListOperationCompleted(object arg) {
            if ((this.GetQuestionTaskListCompleted != null)) {
                System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
                this.GetQuestionTaskListCompleted(this, new GetQuestionTaskListCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
            }
        }
        
        /// <remarks/>
        public new void CancelAsync(object userState) {
            base.CancelAsync(userState);
        }
    }
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    public delegate void GetRecordNumCompletedEventHandler(object sender, GetRecordNumCompletedEventArgs e);
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    public partial class GetRecordNumCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {
        
        private object[] results;
        
        internal GetRecordNumCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) : 
                base(exception, cancelled, userState) {
            this.results = results;
        }
        
        /// <remarks/>
        public int[] Result {
            get {
                this.RaiseExceptionIfNecessary();
                return ((int[])(this.results[0]));
            }
        }
    }
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    public delegate void GetVoteListCompletedEventHandler(object sender, GetVoteListCompletedEventArgs e);
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    public partial class GetVoteListCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {
        
        private object[] results;
        
        internal GetVoteListCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) : 
                base(exception, cancelled, userState) {
            this.results = results;
        }
        
        /// <remarks/>
        public System.Data.DataSet Result {
            get {
                this.RaiseExceptionIfNecessary();
                return ((System.Data.DataSet)(this.results[0]));
            }
        }
    }
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    public delegate void VoteCompletedEventHandler(object sender, VoteCompletedEventArgs e);
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    public partial class VoteCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {
        
        private object[] results;
        
        internal VoteCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) : 
                base(exception, cancelled, userState) {
            this.results = results;
        }
        
        /// <remarks/>
        public bool Result {
            get {
                this.RaiseExceptionIfNecessary();
                return ((bool)(this.results[0]));
            }
        }
    }
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    public delegate void GiveUpCompletedEventHandler(object sender, GiveUpCompletedEventArgs e);
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    public partial class GiveUpCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {
        
        private object[] results;
        
        internal GiveUpCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) : 
                base(exception, cancelled, userState) {
            this.results = results;
        }
        
        /// <remarks/>
        public bool Result {
            get {
                this.RaiseExceptionIfNecessary();
                return ((bool)(this.results[0]));
            }
        }
    }
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    public delegate void GetQuestionTaskListCompletedEventHandler(object sender, GetQuestionTaskListCompletedEventArgs e);
    
    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    public partial class GetQuestionTaskListCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {
        
        private object[] results;
        
        internal GetQuestionTaskListCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) : 
                base(exception, cancelled, userState) {
            this.results = results;
        }
        
        /// <remarks/>
        public System.Data.DataSet Result {
            get {
                this.RaiseExceptionIfNecessary();
                return ((System.Data.DataSet)(this.results[0]));
            }
        }
    }
}

更为详细的可以参见：http://blog.csdn.net/slimboy123/article/details/4344914

方法三：利用http 协议的get  和post

这是最为灵活的方法。

using System;
using System.Collections;
using System.IO;
using System.Net;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
namespace Bingosoft.RIA.Common
{
    /// <summary>
    ///  利用WebRequest/WebResponse进行WebService调用的类
    /// </summary>
    public class WebServiceCaller
    {
        #region Tip:使用说明
        //webServices 应该支持Get和Post调用，在web.config应该增加以下代码
        //<webServices>
        //  <protocols>
        //    <add name="HttpGet"/>
        //    <add name="HttpPost"/>
        //  </protocols>
        //</webServices>

        //调用示例：
        //Hashtable ht = new Hashtable();  //Hashtable 为webservice所需要的参数集
        //ht.Add("str", "test");
        //ht.Add("b", "true");
        //XmlDocument xx = WebSvcCaller.QuerySoapWebService("http://localhost:81/service.asmx", "HelloWorld", ht);
        //MessageBox.Show(xx.OuterXml);
        #endregion

        /// <summary>
        /// 需要WebService支持Post调用
        /// </summary>
        public static XmlDocument QueryPostWebService(String URL, String MethodName, Hashtable Pars)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL + "/" + MethodName);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            SetWebRequest(request);
            byte[] data = EncodePars(Pars);
            WriteRequestData(request, data);
            return ReadXmlResponse(request.GetResponse());
        }

        /// <summary>
        /// 需要WebService支持Get调用
        /// </summary>
        public static XmlDocument QueryGetWebService(String URL, String MethodName, Hashtable Pars)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL + "/" + MethodName + "?" + ParsToString(Pars));
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";
            SetWebRequest(request);
            return ReadXmlResponse(request.GetResponse());
        }

        /// <summary>
        /// 通用WebService调用(Soap),参数Pars为String类型的参数名、参数值
        /// </summary>
        public static XmlDocument QuerySoapWebService(String URL, String MethodName, Hashtable Pars)
        {
            if (_xmlNamespaces.ContainsKey(URL))
            {
                return QuerySoapWebService(URL, MethodName, Pars, _xmlNamespaces[URL].ToString());
            }
            else
            {
                return QuerySoapWebService(URL, MethodName, Pars, GetNamespace(URL));
            }
        }

        private static XmlDocument QuerySoapWebService(String URL, String MethodName, Hashtable Pars, string XmlNs)
        {
            _xmlNamespaces[URL] = XmlNs;//加入缓存，提高效率
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL);
            request.Method = "POST";
            request.ContentType = "text/xml; charset=utf-8";
            request.Headers.Add("SOAPAction", """ + XmlNs + (XmlNs.EndsWith("/") ? "" : "/") + MethodName + """);
            SetWebRequest(request);
            byte[] data = EncodeParsToSoap(Pars, XmlNs, MethodName);
            WriteRequestData(request, data);
            XmlDocument doc = new XmlDocument(), doc2 = new XmlDocument();
            doc = ReadXmlResponse(request.GetResponse());

            XmlNamespaceManager mgr = new XmlNamespaceManager(doc.NameTable);
            mgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
            String RetXml = doc.SelectSingleNode("//soap:Body/*/*", mgr).InnerXml;
            doc2.LoadXml("<root>" + RetXml + "</root>");
            AddDelaration(doc2);
            return doc2;
        }
        private static string GetNamespace(String URL)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL + "?WSDL");
            SetWebRequest(request);
            WebResponse response = request.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(sr.ReadToEnd());
            sr.Close();
            return doc.SelectSingleNode("//@targetNamespace").Value;
        }

        private static byte[] EncodeParsToSoap(Hashtable Pars, String XmlNs, String MethodName)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"></soap:Envelope>");
            AddDelaration(doc);
            //XmlElement soapBody = doc.createElement_x_x("soap", "Body", "http://schemas.xmlsoap.org/soap/envelope/");
            XmlElement soapBody = doc.CreateElement("soap", "Body", "http://schemas.xmlsoap.org/soap/envelope/");
            //XmlElement soapMethod = doc.createElement_x_x(MethodName);
            XmlElement soapMethod = doc.CreateElement(MethodName);
            soapMethod.SetAttribute("xmlns", XmlNs);
            foreach (string k in Pars.Keys)
            {
                //XmlElement soapPar = doc.createElement_x_x(k);
                XmlElement soapPar = doc.CreateElement(k);
                soapPar.InnerXml = ObjectToSoapXml(Pars[k]);
                soapMethod.AppendChild(soapPar);
            }
            soapBody.AppendChild(soapMethod);
            doc.DocumentElement.AppendChild(soapBody);
            return Encoding.UTF8.GetBytes(doc.OuterXml);
        }
        private static string ObjectToSoapXml(object o)
        {
            XmlSerializer mySerializer = new XmlSerializer(o.GetType());
            MemoryStream ms = new MemoryStream();
            mySerializer.Serialize(ms, o);
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(Encoding.UTF8.GetString(ms.ToArray()));
            if (doc.DocumentElement != null)
            {
                return doc.DocumentElement.InnerXml;
            }
            else
            {
                return o.ToString();
            }
        }

        /// <summary>
        /// 设置凭证与超时时间
        /// </summary>
        /// <param name="request"></param>
        private static void SetWebRequest(HttpWebRequest request)
        {
            request.Credentials = CredentialCache.DefaultCredentials;
            request.Timeout = 10000;
        }

        private static void WriteRequestData(HttpWebRequest request, byte[] data)
        {
            request.ContentLength = data.Length;
            Stream writer = request.GetRequestStream();
            writer.Write(data, 0, data.Length);
            writer.Close();
        }

        private static byte[] EncodePars(Hashtable Pars)
        {
            return Encoding.UTF8.GetBytes(ParsToString(Pars));
        }

        private static String ParsToString(Hashtable Pars)
        {
            StringBuilder sb = new StringBuilder();
            foreach (string k in Pars.Keys)
            {
                if (sb.Length > 0)
                {
                    sb.Append("&");
                }
                //sb.Append(HttpUtility.UrlEncode(k) + "=" + HttpUtility.UrlEncode(Pars[k].ToString()));
            }
            return sb.ToString();
        }

        private static XmlDocument ReadXmlResponse(WebResponse response)
        {
            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            String retXml = sr.ReadToEnd();
            sr.Close();
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(retXml);
            return doc;
        }

        private static void AddDelaration(XmlDocument doc)
        {
            XmlDeclaration decl = doc.CreateXmlDeclaration("1.0", "utf-8", null);
            doc.InsertBefore(decl, doc.DocumentElement);
        }

        private static Hashtable _xmlNamespaces = new Hashtable();//缓存xmlNamespace，避免重复调用GetNamespace
    }
}

//跨域，get post 等问题，还可以设置cors方式

<webServices>
<protocols>
<add name="HttpSoap" />
<add name="HttpPost" />
<add name="HttpGet" />
<add name="Documentation" />
</protocols>
</webServices>

webServices返回一种方式

obj = new { success = success, errorMsg = errorMsg, datas = lstCourseView };

//Context.Response.Addheader("Access-Control-Allow-Headers","*");//cors方式
Context.Response.ContentType = "text/html; charset=utf-8";
Context.Response.Write(Newtonsoft.Json.JsonConvert.SerializeObject(obj));
Context.Response.End();