我有一个WCF Restful服务,我作为
Windows服务托管.我想为我的服务添加跨域支持.但是,当我使用global.asax文件时,我可以轻松地做到这一点.但我想将我的服务作为Windows服务托管.
我创建了一个项目,将我的服务托管为Windows服务.现在我面临的问题是,我现在无法添加跨域支持.我尝试了通过app.config文件找到的所有可能的解决方案,但都没有.我在这些链接上尝试了解决方案：
我尝试使用以下函数在代码中设置标题,方法是在每个服务契约方法中调用它.
private static void SetResponseHeader()
{
WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Origin","*");
WebOperationContext.Current.OutgoingResponse.Headers.Add("Cache-Control","no-cache,no-store");
WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Request-Methods","GET,POST,PUT,DELETE,OPTIONS");
WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Headers","Content-Type,Accept");
}
接口：
namespace ReaderService
{
[ServiceContract]
public interface INFCReader
{
[OperationContract]
[WebInvoke(UriTemplate = "GetLogin",Method = "POST")]
GetLoginResults GetLogin(DisplayRequest dispRequest);
}
这里DisplayRequest是一个类.
请帮帮我们如果有人想查看任何其他代码,请告诉我.
非常感谢.
编辑：：：：：：：
非常感谢托马斯的回复.
我创建了一个实现IDispactchMessageInspector的MessageInspector类.我在MessageInspector类中有以下代码.
public class MessageInspector : IDispatchMessageInspector
{
public object AfterReceiveRequest(ref Message request,IClientChannel channel,InstanceContext instanceContext)
{
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin","*");
if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
{
HttpContext.Current.Response.AddHeader("Cache-Control","no-cache");
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods",POST");
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers",Accept");
HttpContext.Current.Response.AddHeader("Access-Control-Max-Age","1728000");
HttpContext.Current.Response.End();
}
return null;
}
}
我现在得到的错误是 – ‘对象引用没有设置为对象的实例.’
错误发生在上面代码的这一行
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin","*");
解决方法
终于找到了我的查询解决方案.
一切都在这里. Supporting Cross Origin Resource
一步一步的解释很好.我想我可能从来没有想过这个问题.
码：
创建2个类,如下所示：
> MessageInspector实现IDispatchMessageInspector.
> BehaviorAttribute实现Attribute,IEndpointBehavior和IOperationBehavior.
具有以下细节：
//MessageInspector Class using System; using System.ServiceModel; using System.ServiceModel.Channels; using System.ServiceModel.Dispatcher; using System.ServiceModel.Description; namespace myCoRSService { public class MessageInspector : IDispatchMessageInspector { private ServiceEndpoint _serviceEndpoint; public MessageInspector(ServiceEndpoint serviceEndpoint) { _serviceEndpoint = serviceEndpoint; } /// <summary> /// Called when an inbound message been received /// </summary> /// <param name="request">The request message.</param> /// <param name="channel">The incoming channel.</param> /// <param name="instanceContext">The current service instance.</param> /// <returns> /// The object used to correlate stateMsg. /// This object is passed back in the method. /// </returns> public object AfterReceiveRequest(ref Message request,InstanceContext instanceContext) { StateMessage stateMsg = null; HttpRequestMessageProperty requestProperty = null; if (request.Properties.ContainsKey(HttpRequestMessageProperty.Name)) { requestProperty = request.Properties[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty; } if (requestProperty != null) { var origin = requestProperty.Headers["Origin"]; if (!string.IsNullOrEmpty(origin)) { stateMsg = new StateMessage(); // if a cors options request (preflight) is detected,// we create our own reply message and don't invoke any // operation at all. if (requestProperty.Method == "OPTIONS") { stateMsg.Message = Message.CreateMessage(request.Version,null); } request.Properties.Add("CrossOriginResourceSharingState",stateMsg); } } return stateMsg; } /// <summary> /// Called after the operation has returned but before the reply message /// is sent. /// </summary> /// <param name="reply">The reply message. This value is null if the /// operation is one way.</param> /// <param name="correlationState">The correlation object returned from /// the method.</param> public void BeforeSendReply(ref Message reply,object correlationState) { var stateMsg = correlationState as StateMessage; if (stateMsg != null) { if (stateMsg.Message != null) { reply = stateMsg.Message; } HttpResponseMessageProperty responseProperty = null; if (reply.Properties.ContainsKey(HttpResponseMessageProperty.Name)) { responseProperty = reply.Properties[HttpResponseMessageProperty.Name] as HttpResponseMessageProperty; } if (responseProperty == null) { responseProperty = new HttpResponseMessageProperty(); reply.Properties.Add(HttpResponseMessageProperty.Name,responseProperty); } // Access-Control-Allow-Origin should be added for all cors responses responseProperty.Headers.Set("Access-Control-Allow-Origin","*"); if (stateMsg.Message != null) { // the following headers should only be added for OPTIONS requests responseProperty.Headers.Set("Access-Control-Allow-Methods","POST,OPTIONS,GET"); responseProperty.Headers.Set("Access-Control-Allow-Headers",Accept,Authorization,x-requested-with"); } } } } class StateMessage { public Message Message; } } //BehaviorAttribute Class using System; using System.ServiceModel.Channels; using System.ServiceModel.Description; using System.ServiceModel.Dispatcher; namespace OpenBetRetail.NFCReaderService { public class BehaviorAttribute : Attribute,IEndpointBehavior,IOperationBehavior { public void Validate(ServiceEndpoint endpoint) { } public void AddBindingParameters(ServiceEndpoint endpoint,BindingParameterCollection bindingParameters) { } /// <summary> /// This service modify or extend the service across an endpoint. /// </summary> /// <param name="endpoint">The endpoint that exposes the contract.</param> /// <param name="endpointDispatcher">The endpoint dispatcher to be /// modified or extended.</param> public void ApplyDispatchBehavior(ServiceEndpoint endpoint,EndpointDispatcher endpointDispatcher) { // add inspector which detects cross origin requests endpointDispatcher.DispatchRuntime.MessageInspectors.Add( new MessageInspector(endpoint)); } public void ApplyClientBehavior(ServiceEndpoint endpoint,ClientRuntime clientRuntime) { } public void Validate(OperationDescription operationDescription) { } public void ApplyDispatchBehavior(OperationDescription operationDescription,DispatchOperation dispatchOperation) { } public void ApplyClientBehavior(OperationDescription operationDescription,ClientOperation clientOperation) { } public void AddBindingParameters(OperationDescription operationDescription,BindingParameterCollection bindingParameters) { } } }
在此之后,您需要做的就是将此消息检查器添加到服务端点行为.
ServiceHost host = new ServiceHost(typeof(myService),_baseAddress);
foreach (ServiceEndpoint EP in host.Description.Endpoints)
EP.Behaviors.Add(new BehaviorAttribute());
谢谢大家帮助.
