动态调用Webservice

/// <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>
  private 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));
   }
  }

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