c# 三种方法调用WebService接口

/// <summary>
  /// 动态调用WebService的帮助类
  /// </summary>
  public class WebServiceHelper
  {
    #region InvokeWebService
    /// < 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 object InvokeWebService(string url, string methodname, object[] args)
    {
      return this.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">类名< /param>
    /// < param name="methodname">方法名< /param> 
    /// < param name="args">参数< /param> 
    /// < returns>< /returns> 
    public 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();
        if (!url.ToUpper().Contains("WSDL"))
        {
          url = string.Format("{0}?{1}", url, "WSDL");
        }
        Stream stream = wc.OpenRead(url);
        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 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)
        {
          StringBuilder sb = new StringBuilder();
          foreach (CompilerError ce in cr.Errors)
          {
            sb.Append(ce.ToString());
            sb.Append(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('.');
      if (pps[0].Contains("?"))
      {
        return pps[0].Split('?')[0];
      }
      return pps[0];
    }
    #endregion
  }
WebServiceHelper

WebServiceHelper

WebServiceHelper webService = new WebServiceHelper();
      object obj= webService.InvokeWebService("http://127.0.0.1:8001/WebService1.asmx", "Add", new object[] {22,33 });
      DataTable dt = obj as DataTable;