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该解决方案还涵盖了使用Owin自托管的Web API。部分地从这里。您可以在其中创建一个私有方法，ApiController无论您如何托管Web API，该方法都将返回远程IP地址： private const string HttpContext = "MS_HttpContext"; private const string RemoteEndpointMessage =     "System.ServiceModel.Channels.RemoteEndpointMessageProperty"; private const string OwinContext = "MS_OwinContext"; private string GetClientIp(HttpRequestMessage request) {       // Web-hosting       if (request.Properties.ContainsKey(HttpContext ))       {            HttpContextWrapper ctx =                 (HttpContextWrapper)request.Properties[HttpContext];            if (ctx != null)            {                return ctx.Request.UserHostAddress;            }       }       // Self-hosting       if (request.Properties.ContainsKey(RemoteEndpointMessage))       {            RemoteEndpointMessageProperty remoteEndpoint =                (RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessage];            if (remoteEndpoint != null)            {                return remoteEndpoint.Address;            }        }       // Self-hosting using Owin       if (request.Properties.ContainsKey(OwinContext))       {           OwinContext owinContext = (OwinContext)request.Properties[OwinContext];           if (owinContext != null)           {               return owinContext.Request.RemoteIpAddress;           }       }        return null; }所需参考资料：HttpContextWrapper -System.Web.dllRemoteEndpointMessageProperty -System.ServiceModel.dllOwinContext -Microsoft.Owin.dll(如果使用Owin包，则已经有了)此解决方案的一个小问题是，当您在运行时实际上只使用其中的一种情况时，必须为所有3种情况加载库。作为建议在这里，这可以通过使用可以克服dynamic变量。您也可以将GetClientIpAddress方法编写为的扩展HttpRequestMethod。using System.Net.Http;public static class HttpRequestMessageExtensions{    private const string HttpContext = "MS_HttpContext";    private const string RemoteEndpointMessage =        "System.ServiceModel.Channels.RemoteEndpointMessageProperty";    private const string OwinContext = "MS_OwinContext";    public static string GetClientIpAddress(this HttpRequestMessage request)    {       // Web-hosting. Needs reference to System.Web.dll       if (request.Properties.ContainsKey(HttpContext))       {           dynamic ctx = request.Properties[HttpContext];           if (ctx != null)           {               return ctx.Request.UserHostAddress;           }       }       // Self-hosting. Needs reference to System.ServiceModel.dll.        if (request.Properties.ContainsKey(RemoteEndpointMessage))       {            dynamic remoteEndpoint = request.Properties[RemoteEndpointMessage];            if (remoteEndpoint != null)            {                return remoteEndpoint.Address;            }        }       // Self-hosting using Owin. Needs reference to Microsoft.Owin.dll.        if (request.Properties.ContainsKey(OwinContext))       {           dynamic owinContext = request.Properties[OwinContext];           if (owinContext != null)           {               return owinContext.Request.RemoteIpAddress;           }       }        return null;    }}现在您可以像这样使用它：public class TestController : ApiController{    [HttpPost]    [ActionName("TestRemoteIp")]    public string TestRemoteIp()    {        return Request.GetClientIpAddress();    }}