动态调用Web Service的方法

下面这个例子可以供参考

/**/
/// <summary>
/// 根据指定的信息，调用远程WebService方法
/// </summary>
/// <param name="url">WebService的http形式的地址</param>
/// <param name="namespace">欲调用的WebService的命名空间</param>
/// <param name="classname">欲调用的WebService的类名（不包括命名空间前缀）</param>
/// <param name="methodname">欲调用的WebService的方法名</param>
/// <param name="args">参数列表</param>
/// <returns>WebService的执行结果</returns>
/// <remarks>
/// 如果调用失败，将会抛出Exception。请调用的时候，适当截获异常。
/// 异常信息可能会发生在两个地方：
/// 1、动态构造WebService的时候，CompileAssembly失败。
/// 2、WebService本身执行失败。
/// </remarks>
/// <example>
/// <code>
/// object obj = InvokeWebservice("http://localhost/GSP_WorkflowWebservice/common.asmx","Genersoft.Platform.Service.Workflow","Common","GetToolType",new object[]{"1"});
/// </code>
/// </example>
public static object InvokeWebservice(string url, string @namespace, string classname, string methodname, object[] args)
{
    try
    {
        System.Net.WebClient wc = new System.Net.WebClient();
        System.IO.Stream stream = wc.OpenRead(url + "?WSDL");
        System.Web.Services.Description.ServiceDescription sd = System.Web.Services.Description.ServiceDescription.Read(stream);
        System.Web.Services.Description.ServiceDescriptionImporter sdi = new System.Web.Services.Description.ServiceDescriptionImporter();
        sdi.AddServiceDescription(sd, "", "");
        System.CodeDom.CodeNamespace cn = new System.CodeDom.CodeNamespace(@namespace);
        System.CodeDom.CodeCompileUnit ccu = new System.CodeDom.CodeCompileUnit();
        ccu.Namespaces.Add(cn);
        sdi.Import(cn, ccu);

        Microsoft.CSharp.CSharpCodeProvider csc = new Microsoft.CSharp.CSharpCodeProvider();
        System.CodeDom.Compiler.ICodeCompiler icc = csc.CreateCompiler();

        System.CodeDom.Compiler.CompilerParameters cplist = new System.CodeDom.Compiler.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");

        System.CodeDom.Compiler.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());
        }
        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));
    }
}