动态调用WebService

通过添加引用的方式来引用WebService不够灵活，在实际应用中，进行测试和正式切换时比较麻烦

而采取灵活方式来实际WebService引用就要便捷的多

辅助类：

using System;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Net;
using System.Web.Services.Description;
using System.CodeDom;
using Microsoft.CSharp;
using System.CodeDom.Compiler;
using System.IO;

/// <summary>
/// Webservice 帮助工具类
/// </summary>
public static class WebserviceHelper
{

    /// <summary>
    /// 根据 Url 创建 webservice 实例
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="url"></param>
    /// <returns></returns>
    public static T CreateInstance<T>(string url)
    {
        if (url.EndsWith("svc"))
        {
            return CreateWCF<T>(url);
        }

        if (url.EndsWith("asmx"))
        {
            return CreateAsmx<T>(url);
        }

        return default(T);
    }

    private static T CreateWCF<T>(string url)
    {
        BasicHttpBinding basicBinding = new BasicHttpBinding();
        CustomBinding binding = new CustomBinding(basicBinding);
        BindingElement binaryElement = new BinaryMessageEncodingBindingElement();
        binding.Elements.Remove(binding.Elements[0]);
        binding.Elements.Insert(0, binaryElement);

        EndpointAddress endPoint = new EndpointAddress(url);

        T client = (T)Activator.CreateInstance(typeof(T), binding, endPoint);

        return client;
    }

    private static T CreateAsmx<T>(string url)
    {
        BasicHttpBinding basicBinding = new BasicHttpBinding();
        basicBinding.MaxBufferSize = int.MaxValue;
        basicBinding.MaxReceivedMessageSize = int.MaxValue;
        basicBinding.ReceiveTimeout = TimeSpan.FromMinutes(10);
        basicBinding.OpenTimeout = TimeSpan.FromMinutes(1);

        CustomBinding binding = new CustomBinding(basicBinding);
        EndpointAddress endPoint = new EndpointAddress(url);

        T client = (T)Activator.CreateInstance(typeof(T), binding, endPoint);

        return client;
    }

    #region 动态调用WebService动态调用地址
    /// < summary>           
    /// 动态调用web服务         
    /// </summary>          
    /// < param name="url">WSDL服务地址</param> 
    /// < param name="methodname">方法名</param>           
    /// < param name="args">参数</param>           
    /// < returns></returns>          
    public static object InvokeWebService(string url, string methodname, object[] args)
    {
        return WebserviceHelper.InvokeWebService(url, null, methodname, args);
    }
    /// <summary>
    /// 动态调用web服务
    /// </summary>
    /// <param name="url">WSDL服务地址</param>
    /// <param name="classname">服务接口类名</param>
    /// <param name="methodname">方法名</param>
    /// <param name="args">参数值</param>
    /// <returns></returns>
    public static object InvokeWebService(string url, string classname, string methodname, object[] args)
    {

        string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
        if ((classname == null) || (classname == ""))
        {
            classname = WebserviceHelper.GetWsClassName(url);
        }
        try
        {

            //获取WSDL   
            WebClient wc = new WebClient();
            Stream stream = wc.OpenRead(url + "?WSDL");
            ServiceDescription sd = ServiceDescription.Read(stream);
            //注意classname一定要赋值获取 
            classname = sd.Services[0].Name;

            ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
            sdi.AddServiceDescription(sd, "", "");
            CodeNamespace cn = new CodeNamespace(@namespace);

            //生成客户端代理类代码          
            CodeCompileUnit ccu = new CodeCompileUnit();
            ccu.Namespaces.Add(cn);
            sdi.Import(cn, ccu);
            CSharpCodeProvider icc = new CSharpCodeProvider();


            //设定编译参数                 
            CompilerParameters cplist = new CompilerParameters();
            cplist.GenerateExecutable = false;
            cplist.GenerateInMemory = true;
            cplist.ReferencedAssemblies.Add("System.dll");
            cplist.ReferencedAssemblies.Add("System.XML.dll");
            cplist.ReferencedAssemblies.Add("System.Web.Services.dll");
            cplist.ReferencedAssemblies.Add("System.Data.dll");
            //编译代理类                 
            CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
            if (true == cr.Errors.HasErrors)
            {
                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors)
                {
                    sb.Append(ce.ToString());
                    sb.Append(System.Environment.NewLine);
                }
                throw new Exception(sb.ToString());
            }
            //生成代理实例，并调用方法                 
            System.Reflection.Assembly assembly = cr.CompiledAssembly;
            Type t = assembly.GetType(@namespace + "." + classname, true, true);
            object obj = Activator.CreateInstance(t);
            System.Reflection.MethodInfo mi = t.GetMethod(methodname);
            return mi.Invoke(obj, args);

        }
        catch (Exception ex)
        {
            throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));
            // return "Error:WebService调用错误！" + ex.Message;
        }
    }
    /// <summary>
    /// 获取web服务的classname
    /// </summary>
    /// <param name="wsUrl"></param>
    /// <returns></returns>
    private static string GetWsClassName(string wsUrl)
    {
        string[] parts = wsUrl.Split('/');
        string[] pps = parts[parts.Length - 1].Split('.');
        return pps[0];
    }
    #endregion

}

调用：

    object[] args = new object[2];
    args[0] = ("");  
    args[1] = ("");  

    object objReturn = WebserviceHelper.InvokeWebService("url",  "hello", args);

摘自：https://www.cnblogs.com/mengfangchao/p/7543660.html