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","Genersoft.Platform.Service.Workflow","Common","GetToolType",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));            }        }