C# 动态调用webservice

using System;

using System.Collections.Generic;

using System.Text;

using System.Net;

using System.IO;

using System.Web.Services.Description;

using System.CodeDom;

using Microsoft.CSharp;

using System.CodeDom.Compiler;



namespace TestClient

{

    public static class WebServiceHelper

    {

        ///   <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。 

        public static byte[] 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);

               //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

                return (byte[])mi.Invoke(obj, args);

            }

            catch (Exception ex)

            {

                throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));

            }

        }  

    }

}

　　调用方法：

      byte[] test = WebServiceHelper.InvokeWebservice(url, ServiceName, ServiceClassName, ServiceMethod, new object[] { 参数});