.Net WebClient调用WebService

    /// <summary>为从具有 <see cref="T:System.String" /> 指定的 URI 的资源下载的数据打开一个可读的流。</summary>     /// <returns>一个 <see cref="T:System.IO.Stream" />，用于从资源读取数据。</returns>     /// <param name="address">以 <see cref="T:System.String" /> 形式指定的 URI，将从中下载数据。</param>     public Stream OpenRead(string address)     {       if (address == null)         throw new ArgumentNullException(nameof (address));       return this.OpenRead(this.GetUri(address));     }      /// <summary>为从具有 <see cref="T:System.Uri" /> 指定的 URI 的资源下载的数据打开一个可读的流</summary>     /// <returns>一个 <see cref="T:System.IO.Stream" />，用于从资源读取数据。</returns>     /// <param name="address">以 <see cref="T:System.Uri" /> 形式指定的 URI，将从中下载数据。</param>     public Stream OpenRead(Uri address)     {       if (Logging.On)         Logging.Enter(Logging.Web, (object) this, nameof (OpenRead), (object) address);       if (address == (Uri) null)         throw new ArgumentNullException(nameof (address));       WebRequest request = (WebRequest) null;       this.ClearWebClientState();       try       {         request = this.m_WebRequest = this.GetWebRequest(this.GetUri(address));         Stream responseStream = (this.m_WebResponse = this.GetWebResponse(request)).GetResponseStream();         if (Logging.On)           Logging.Exit(Logging.Web, (object) this, nameof (OpenRead), (object) responseStream);         return responseStream;       }       catch (Exception ex)       {         Exception innerException = ex;         if (innerException is ThreadAbortException || innerException is StackOverflowException || innerException is OutOfMemoryException)         {           throw;         }         else         {           if (!(innerException is WebException) && !(innerException is SecurityException))             innerException = (Exception) new WebException(SR.GetString("net_webclient"), innerException);           WebClient.AbortRequest(request);           throw innerException;         }       }       finally       {         this.CompleteWebClientState();       }     }

    public class DefaultWebServiceClient     {         Type _type;         MethodInfo _method;         object _obj;          public object InvokeService(object[] args)         {             object proxy = GetProxy();             return _method.Invoke(proxy, args);         }          public void SetValue(string fieldName, object value)         {             object proxy = GetProxy();             PropertyInfo field = _type.GetProperty(fieldName);             if (field != null)                 field.SetValue(proxy, value);         }          public object GetProxy()         {             if (_obj == null)                 _obj = Activator.CreateInstance(_type);              return _obj;         }          public MethodInfo MethodInfo         {             get { return _method; }         }          public DefaultWebServiceClient(Stream wsdl, string url, string methodname, string providerName)         {             if (wsdl == null || (wsdl.CanWrite && wsdl.Length == 0))                 throw new Exception("Wsdl为空");              try             {                 ServiceDescription sd = ServiceDescription.Read(wsdl);                 ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();                 sdi.AddServiceDescription(sd, "", "");                 CodeNamespace cn = new CodeNamespace(string.Format("DefaultWebServiceClient_{0}_{1}", providerName, wsdl.GetHashCode().ToString()));                  DiscoveryClientProtocol dcp = new DiscoveryClientProtocol();                 dcp.DiscoverAny(url);                 dcp.ResolveAll();                 foreach (object osd in dcp.Documents.Values)                 {                     if (osd is ServiceDescription) sdi.AddServiceDescription((ServiceDescription)osd, null, null); ;                     if (osd is XmlSchema) sdi.Schemas.Add((XmlSchema)osd);                 }                  //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();                  //设定编译器的参数                  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 StringBuilder();                     foreach (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                  Assembly assembly = cr.CompiledAssembly;                 Type type = null;                 foreach (Type t in assembly.GetExportedTypes())                 {                     if (t.GetCustomAttributes(typeof(System.Web.Services.WebServiceBindingAttribute), false).Count() > 0)                     {                         type = t;                         break;                     }                 }                  MethodInfo mi = null;                  if (type == null)                 {                     throw new Exception("从Wsdl中找不到可调用的类型");                 }                  mi = type.GetMethod(methodname);                 if (mi == null)                 {                     throw new Exception(string.Format("从Wsdl中找不到可调用的方法{0}.{1}", type.Name, methodname));                 }                 _type = type;                 _method = mi;             }             catch (Exception ex)             {                 throw new Exception("创建WebService客户端失败！", ex);             }         }     }