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public class ServiceProxy {

		#region InvokeWebService
		[SecurityPermissionAttribute(SecurityAction.Demand, Unrestricted = true)]
		internal static object CallWebService(string webServiceAsmxUrl, string serviceName, string methodName, object[] args) {

			var client = new WebClient();

			// Connect To the web service
			var stream = client.OpenRead(webServiceAsmxUrl + "?wsdl");
			if (stream == null) return null;
			// Now read the WSDL file describing a service.
			var description = ServiceDescription.Read(stream);

			///// LOAD THE DOM /////////
			// Initialize a service description importer.
			var importer = new ServiceDescriptionImporter {ProtocolName = "Soap12"};

			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.
			var nmspace = new CodeNamespace();

			var 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
				var assemblyReferences = new string[5] { "System.dll", "System.Web.Services.dll", "System.Web.dll", "System.Xml.dll", "System.Data.dll" };

				var parms = new CompilerParameters(assemblyReferences);

				var 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
				var wsvcClass = results.CompiledAssembly.CreateInstance(serviceName);
				if (wsvcClass == null) return null;
				var mi = wsvcClass.GetType().GetMethod(methodName);

				return mi.Invoke(wsvcClass, args);

			}

			else {

				return null;

			}

		}
		#endregion

		public static object CallWebService(string webServiceAsmxUrl, string serviceName)
		{
			throw new System.NotImplementedException();
		}
	}

            //调用
            var url = "www.myweb.com/service1.asmx";
            var args = new object[2];
            args[0] = "参数1";
            args[1] = "参数2";

            var result = ServiceProxy.CallWebService(url,"服务名称", "方法名称", args);
            
            return result.ToString() ;//Web服务中方法的返回值