/// <summary>為從具有 <see cref="T:System.String" /> 指定的 URI 的資源下載的數(shù)據(jù)打開一個(gè)可讀的流。</summary>
    /// <returns>一個(gè) <see cref="T:System.IO.Stream" />，用于從資源讀取數(shù)據(jù)。</returns>
    /// <param name="address">以 <see cref="T:System.String" /> 形式指定的 URI，將從中下載數(shù)據(jù)。</param>
    public Stream OpenRead(string address)
    {
      if (address == null)
        throw new ArgumentNullException(nameof (address));
      return this.OpenRead(this.GetUri(address));
    }

    /// <summary>為從具有 <see cref="T:System.Uri" /> 指定的 URI 的資源下載的數(shù)據(jù)打開一個(gè)可讀的流</summary>
    /// <returns>一個(gè) <see cref="T:System.IO.Stream" />，用于從資源讀取數(shù)據(jù)。</returns>
    /// <param name="address">以 <see cref="T:System.Uri" /> 形式指定的 URI，將從中下載數(shù)據(jù)。</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為空");

            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);
                }

                //生成客戶端代理類代碼 
                CodeCompileUnit ccu = new CodeCompileUnit();
                ccu.Namespaces.Add(cn);
                sdi.Import(cn, ccu);
                CSharpCodeProvider csc = new CSharpCodeProvider();
                ICodeCompiler icc = csc.CreateCompiler();

                //設(shè)定編譯器的參數(shù) 
                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");

                //編譯代理類 
                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());
                }

                //生成代理實(shí)例,并調(diào)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("從Wsdl中找不到可調(diào)用的類型");
                }

                mi = type.GetMethod(methodname);
                if (mi == null)
                {
                    throw new Exception(string.Format("從Wsdl中找不到可調(diào)用的方法{0}.{1}", type.Name, methodname));
                }
                _type = type;
                _method = mi;
            }
            catch (Exception ex)
            {
                throw new Exception("創(chuàng)建WebService客戶端失敗！", ex);
            }
        }
    }