為方法添加將OneWay屬性并設(shè)置為true時(shí)，客戶端將立即返回，不能接收返回值，并且也不毀的到依法的任何異常通知
該屬性位于System.Web.Service.Protocols命名空間下

[WebMethod]
[SoapRpcMethod(OneWay=true)]
public void StartLongOperation()
{
?/
}

如果為一個(gè)有返回值的方法添加OneWay屬性，編譯時(shí)并不會(huì)拋出錯(cuò)誤，但是將無法引用服務(wù)，
如果調(diào)用測(cè)試頁(yè)，會(huì)得到一下結(jié)果

One-way methods cannot have return values.
Parameter name: methodInfo

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: One-way methods cannot have return values.
Parameter name: methodInfo

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:

[ArgumentException: One-way methods cannot have return values.Parameter name: methodInfo]System.Web.Services.Protocols.SoapReflector.ReflectMethod(LogicalMethodInfo methodInfo, Boolean client, XmlReflectionImporter xmlImporter, SoapReflectionImporter soapImporter, String defaultNs) +4643[InvalidOperationException: Method FavoriteService.add can not be reflected.]System.Web.Services.Protocols.SoapReflector.ReflectMethod(LogicalMethodInfo methodInfo, Boolean client, XmlReflectionImporter xmlImporter, SoapReflectionImporter soapImporter, String defaultNs) +6633System.Web.Services.Description.SoapProtocolReflector.ReflectMethod() +134System.Web.Services.Description.ProtocolReflector.ReflectBinding(ReflectedBinding reflectedBinding) +2511System.Web.Services.Description.ProtocolReflector.Reflect() +626System.Web.Services.Description.ServiceDescriptionReflector.ReflectInternal(ProtocolReflector[] reflectors) +560System.Web.Services.Description.ServiceDescriptionReflector.Reflect(Type type, String url) +117System.Web.Services.Protocols.DocumentationServerType..ctor(Type type, String uri) +159System.Web.Services.Protocols.DocumentationServerProtocol.Initialize() +335System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing) +99[InvalidOperationException: Unable to handle request.]System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing) +258System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +93[InvalidOperationException: Failed to handle request.]System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +240System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath) +106System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +328System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +139System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +146
Version Information:?Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

轉(zhuǎn)載于:https://www.cnblogs.com/stswordman/archive/2006/07/03/441844.html

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