/// ;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;
private 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));
 }
}