c# 动态调用webservice的小例子

class ServiceClass
 {
  #region InvokeWebService
  //动态调用web服务
  public static object InvokeWebService(string url, string methodname, object[] args)
  {
   return ServiceClass.InvokeWebService(url, null, methodname, args);
  }

  public static object InvokeWebService(string url, string classname, string methodname, object[] args)
  {
   string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
   if ((classname == null) || (classname == ""))
   {
    classname = ServiceClass.GetWsClassName(url);
   }

   try
   {
    //获取WSDL
    WebClient wc = new WebClient();
    Stream stream = wc.OpenRead(url + "?WSDL");
    ServiceDescription sd = ServiceDescription.Read(stream);
    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 csc = new CSharpCodeProvider();
    ICodeCompiler icc = csc.CreateCompiler();

    //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));
   }
  }

  private static string GetWsClassName(string wsUrl)
  {
   string[] parts = wsUrl.Split('/');
   string[] pps = parts[parts.Length - 1].Split('.');

   return pps[0];
  }
  #endregion
 }

string url = "http://www.jb200.com/globalweather.asmx" ;
string[] args = new string[2] ;
args[0] = this.textBox_CityName.Text ;
args[1] = "China" ;
object result = WebServiceHelper.InvokeWebService(url ,"GetWeather" ,args) ;
this.label_Result.Text = result.ToString() ;