远程调用WebService

/// <summary>
??????? /// 根据指定的信息，调用远程WebService方法
??????? /// </summary>
??????? /// <param name="url">WebService的http形式的地址</param>
??????? /// <param name="namespace">欲调用的WebService的命名空间</param>
??????? /// <param name="classname">欲调用的WebService的类名（不包括命名空间前缀）</param>
??????? /// <param name="methodname">欲调用的WebService的方法名</param>
??????? /// <param name="args">参数列表</param>
??????? /// <returns>WebService的执行结果</returns>
??????? /// <remarks>
??????? /// 如果调用失败，将会抛出Exception。请调用的时候，适当截获异常。
??????? /// 异常信息可能会发生在两个地方：
??????? /// 1、动态构造WebService的时候，CompileAssembly失败。
??????? /// 2、WebService本身执行失败。
??????? /// </remarks>
??????? /// <example>
??????? /// <code>
??????? /// object obj = InvokeWebservice("http://localhost/GSP_WorkflowWebservice/common.asmx",new object[]{"1"});
??????? /// </code>
??????? /// </example>
??????? public static object InvokeWebservice(string url,string @namespace,string classname,string methodname,object[] args)
??????? {???????
??????????? try
??????????? {
??????????????? System.Net.WebClient wc = new System.Net.WebClient();
??????????????? System.IO.Stream stream = wc.OpenRead(url+"?WSDL");
??????????????? System.Web.Services.Description.ServiceDescription sd = System.Web.Services.Description.ServiceDescription.Read(stream);
??????????????? System.Web.Services.Description.ServiceDescriptionImporter sdi = new System.Web.Services.Description.ServiceDescriptionImporter();
??????????????? sdi.AddServiceDescription(sd,"","");
??????????????? System.CodeDom.CodeNamespace cn = new System.CodeDom.CodeNamespace(@namespace);
??????????????? System.CodeDom.CodeCompileUnit ccu = new System.CodeDom.CodeCompileUnit();
??????????????? ccu.Namespaces.Add(cn);
??????????????? sdi.Import(cn,ccu);

??????????????? Microsoft.CSharp.CSharpCodeProvider csc = new Microsoft.CSharp.CSharpCodeProvider();
??????????????? System.CodeDom.Compiler.ICodeCompiler icc = csc.CreateCompiler();

??????????????? System.CodeDom.Compiler.CompilerParameters cplist = new System.CodeDom.Compiler.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");

??????????????? System.CodeDom.Compiler.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());??????????????? }??????????????? 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));??????????? }??????? }