C#动态调用WebService

 

代码namespace DynamicCallWebService
{
    public class WebServiceCaller
    {
        public static object InvokeWebService(string url, string methodName, object[] args)
        {
            return InvokeWebService(url, null, methodName, args);
        }
        public static object InvokeWebService(string url, string className, string methodName, object[] args)
        {
            string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
            if (string.IsNullOrEmpty(className))
            {
                className = GetWsClassName(url);
            }
            try
            {
                //Get WSDL
                string wsdlUrl = url + "?WSDL";
                WebClient webClient = new WebClient();
                Stream stream = webClient.OpenRead(wsdlUrl);
                ServiceDescription sd = ServiceDescription.Read(stream);
                if (!string.IsNullOrEmpty(sd.Name) && sd.Name != className)
                    className = sd.Name;
                ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
                sdi.AddServiceDescription(sd, "", "");

                
                // Add any child namespaces First
                foreach (Import schemaImport in sd.Imports)
                {
                    Uri baseUri = new Uri(wsdlUrl);
                    string schemaLocation = schemaImport.Location;
                    if (schemaLocation == null)
                        continue;
                    Uri schemaUri = new Uri(baseUri, schemaLocation);

                    using (Stream schemaStream = webClient.OpenRead(schemaUri))
                    {
                        try
                        {
                            ServiceDescription sdImport = ServiceDescription.Read(schemaStream, true);
                            sdImport.Namespaces.Add("wsdl", schemaImport.Namespace);
                            sdi.AddServiceDescription(sdImport, null, null);
                        }
                        catch { }  // ignore schema import errors
                    }
                }

                // Download and inject any imported schemas (ie. WCF generated WSDL)            
                foreach (XmlSchema wsdlSchema in sd.Types.Schemas)
                {
                    // Loop through all detected imports in the main schema
                    foreach (XmlSchemaObject externalSchema in wsdlSchema.Includes)
                    {
                        // Read each external schema into a schema object and add to importer
                        if (externalSchema is XmlSchemaImport)
                        {
                            Uri baseUri = new Uri(wsdlUrl);
                            string exSchemaLocation = ((XmlSchemaExternal)externalSchema).SchemaLocation;
                            if (string.IsNullOrEmpty(exSchemaLocation))
                                continue;

                            Uri schemaUri = new Uri(baseUri, exSchemaLocation);

                            using (Stream schemaStream = webClient.OpenRead(schemaUri))
                            {
                                try
                                {
                                    System.Xml.Schema.XmlSchema schema = XmlSchema.Read(schemaStream, null);
                                    sdi.Schemas.Add(schema);
                                }
                                catch { }  // ignore schema import errors                                                        
                            }
                        }
                    }
                }

                CodeNamespace cn = new CodeNamespace(@namespace);
                //Create Client proxy class
                CodeCompileUnit ccu = new CodeCompileUnit();
                ccu.Namespaces.Add(cn);
                sdi.Import(cn, ccu);
                CSharpCodeProvider csc = new CSharpCodeProvider();
                ICodeCompiler icc = csc.CreateCompiler();
                //Set complier parameters
                CompilerParameters cplist = new 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");
                //complie proxy class
                CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
                if (true == cr.Errors.HasErrors)
                {
                    StringBuilder sb = new StringBuilder();
                    foreach (CompilerError ce in cr.Errors)
                    {
                        sb.Append(ce.ToString());
                        sb.Append(Environment.NewLine);
                    }
                    throw new Exception(sb.ToString());
                }
                //Generate proxy instance and invoke mehtod
                Assembly assembly = cr.CompiledAssembly;
                Type t = assembly.GetType(@namespace + "." + className, true, true);
                object obj = Activator.CreateInstance(t);
                MethodInfo method = t.GetMethod(methodName);
                return method.Invoke(obj, args);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));
            }
        }

        public static string GetWsClassName(string wsUrl)
        {
            string[] parts = wsUrl.Split('/');
            string[] pps = parts[parts.Length - 1].Split('.');
            return pps[0];
        }
    }
}