动态添加web引用C#

我的代码是：

internal class WsProxy
{
    [SecurityPermissionAttribute(SecurityAction.Demand, Unrestricted = true)]
    internal static object CallWebService(string webServiceAsmxUrl, string userName, string password, string serviceName, string methodName, object[] args) 
    {
        System.Net.WebClient client = new System.Net.WebClient();
        if (userName.Length > 0)
        {
            client.Credentials = new NetworkCredential(userName, password);
        } 
        // Connect To the web service
        System.IO.Stream stream = client.OpenRead(webServiceAsmxUrl + "?wsdl");
        // Now read the WSDL file describing a service.
        ServiceDescription description = ServiceDescription.Read(stream);
        ///// LOAD THE DOM /////////
        // Initialize a service description importer.
        ServiceDescriptionImporter importer = new ServiceDescriptionImporter();
        importer.ProtocolName = "Soap"; // Use SOAP 1.2.
        importer.AddServiceDescription(description, null, null);
        // Generate a proxy client.
        importer.Style = ServiceDescriptionImportStyle.Client;
        // Generate properties to represent primitive values.
        importer.CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateProperties;
        // Initialize a Code-DOM tree into which we will import the service.
        CodeNamespace nmspace = new CodeNamespace();
        CodeCompileUnit unit1 = new CodeCompileUnit();
        unit1.Namespaces.Add(nmspace);
        // Import the service into the Code-DOM tree. This creates proxy code that uses the service.
        ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit1);
        if (warning == 0) // If zero then we are good to go
        {
            // Generate the proxy code
            CodeDomProvider provider1 = CodeDomProvider.CreateProvider("CSharp");
            // Compile the assembly proxy with the appropriate references
            string[] assemblyReferences = new string[5] { "System.dll", "System.Web.Services.dll", "System.Web.dll", "System.Xml.dll", "System.Data.dll" };
            CompilerParameters parms = new CompilerParameters(assemblyReferences);
            CompilerResults results = provider1.CompileAssemblyFromDom(parms, unit1);
            // Check For Errors
            if (results.Errors.Count > 0)
            {
                foreach (CompilerError oops in results.Errors)
                {
                    System.Diagnostics.Debug.WriteLine("========Compiler error============");
                    System.Diagnostics.Debug.WriteLine(oops.ErrorText);
                }
                throw new System.Exception("Compile Error Occured calling webservice. Check Debug ouput window.");
            }
            // Finally, Invoke the web service method
            object wsvcClass = results.CompiledAssembly.CreateInstance("nmspace");//nmspace
            MethodInfo mi = wsvcClass.GetType().GetMethod(methodName);
            return mi.Invoke(wsvcClass, args);
        }
        else
        {
            return null;
        }
    }

我是这样称呼它的：

object[] arg = new object[5];
WsProxy.CallWebService(@"myurl/somename.asmx", "NameService", "TheMethod", arg); 

但每次wsvcClass都为null。

我试着换

object wsvcClass = results.CompiledAssembly.CreateInstance("nmspace");

至

object wsvcClass = results.CompiledAssembly.CreateInstance("nmspace."+serviceName);

但它不起作用。

每个人都说这个代码很有魅力，但我无法让它发挥作用。为什么？

更新：以下是我动态添加引用时所做的操作：

Namespace.MyService defect = new Namespace.MyService();
defect.Name = "someName";

以下是我如何尝试通过代码做到这一点：

object wsvcClass = results.CompiledAssembly.CreateInstance("Namespace." + "MyService");
MethodInfo mi = wsvcClass.GetType().GetMethod("Namespace." + "MyService");
return mi.Invoke(null, new object[] { "someName" });

mi为空，我知道最后一行也有问题。这在我看来很愚蠢。

object wsvcClass = results.CompiledAssembly.CreateInstance(serviceName);