动态生成WebService的客户端

给定了WebService地址和调用接口后动态的生成DLL，第二次再请求时会先判断DLL是否存在，以提高执行效率

 

核心代码下：

/// <summary>
        /// 动态生成WebService服务客户端
        /// </summary>
        /// <param name="serviceProvider">WebService服务的提供者</param>
        /// <param name="url">WebService具体地址</param>
        /// <param name="serviceName">需要调用的类名</param>
        /// <param name="actionName">需要请求的方法</param>
        /// <param name="args">方法参数列表</param>
        /// <returns></returns>
        public static object InvokeWebService(string serviceProvider, string url, string serviceName, string actionName, object[] args)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }

            if (string.IsNullOrEmpty(serviceName))
            {
                serviceName = GetWsClassName(url);
            }

            var shortUrl = BuildShortUrl(url);

            var nameSpace = string.Format("{0}_{1}_{2}", serviceProvider, serviceName, shortUrl);
            var binDir = HttpRuntime.AppDomainId == null ? AppDomain.CurrentDomain.BaseDirectory : HttpRuntime.BinDirectory;
            var asmFullPath = System.IO.Path.Combine(binDir, string.Format("{0}.dll", nameSpace));

            #region
            if (!File.Exists(asmFullPath))
            {
                if (!url.ToLower().EndsWith("?wsdl"))
                {
                    url += "?wsdl";
                }

                //获取WSDL 
                WebClient webClient = new WebClient();

                try
                {
                    #region 动态生成DLL
                    Stream wsdlStream = webClient.OpenRead(url);

                    //服务描述
                    ServiceDescription serviceDesc = ServiceDescription.Read(wsdlStream);

                    //生成客户端代理类
                    ServiceDescriptionImporter clientBuilder = new ServiceDescriptionImporter()
                    {
                        CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateNewAsync | System.Xml.Serialization.CodeGenerationOptions.GenerateProperties,
                        ProtocolName = "Soap",
                        Style = ServiceDescriptionImportStyle.Client
                    };
                    clientBuilder.AddServiceDescription(serviceDesc, null, null);


                    //生成客户端代理类代码
                    CodeNamespace ns = new CodeNamespace(nameSpace);
                    CodeCompileUnit ccu = new CodeCompileUnit();
                    ccu.Namespaces.Add(ns);

                    //按照clientBuilder的配置来生成代码
                    clientBuilder.Import(ns, ccu);

                    //C#代码容器
                    var sourceCodeProvider = new CSharpCodeProvider();

                    //设定编译参数
                    var comParams = new CompilerParameters();
                    comParams.GenerateExecutable = false;//如果此属性的值为 false，则生成 DLL
                    comParams.GenerateInMemory = false;
                    comParams.OutputAssembly = asmFullPath; // 可以指定你所需的任何文件名。
                    comParams.ReferencedAssemblies.Add("System.dll");
                    comParams.ReferencedAssemblies.Add("System.XML.dll");
                    comParams.ReferencedAssemblies.Add("System.Web.Services.dll");
                    comParams.ReferencedAssemblies.Add("System.Data.dll");
                    comParams.CompilerOptions = "/optimize";

                    //编译                 
                    var comResult = sourceCodeProvider.CompileAssemblyFromDom(comParams, ccu);

                    if (comResult.Errors.HasErrors)
                    {
                        System.Text.StringBuilder sb = new System.Text.StringBuilder();

                        foreach (System.CodeDom.Compiler.CompilerError ce in comResult.Errors)
                        {
                            sb.Append(ce.ToString());
                            sb.Append(System.Environment.NewLine);
                        }

                        throw new Exception(sb.ToString());
                    }
                    #endregion
                }
                catch (Exception ex)
                {
                }
                finally
                {
                    webClient.Dispose();
                }
            }
            #endregion

            //生成代理实例，并调用方法
            var asm = System.Reflection.Assembly.LoadFile(asmFullPath);
            Type t = asm.GetType(nameSpace + "." + serviceName, true, true);
            object obj = Activator.CreateInstance(t);
            System.Reflection.MethodInfo mi = t.GetMethod(actionName);
            return mi.Invoke(obj, args);
        }

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