根据JSON spec的说法,表示空值的正确方法是文字null
。
如果是这样,为什么WCF返回一个空响应而不是null
?这是一个bug,还是这种行为被记录在某个地方?
完整的repro示例:
using System;
using System.ServiceModel;
using System.ServiceModel.Web;
[ServiceContract()]
public class Service1
{
[OperationContract(), WebGet(ResponseFormat = WebMessageFormat.Json)]
public string GetSomeString() { return "SomeString"; }
[OperationContract(), WebGet(ResponseFormat = WebMessageFormat.Json)]
public string GetNull() { return null; }
}
public class Host
{
public static void Main()
{
// Very simple WCF server
var host = new WebServiceHost(typeof(Service1), new Uri("http://localhost:8000/"));
host.AddServiceEndpoint(typeof(Service1), new WebHttpBinding() {
HostNameComparisonMode = HostNameComparisonMode.Exact
}, "");
host.Open();
Console.WriteLine("Service is running, press enter to quit...");
Console.ReadLine();
host.Close();
}
}
预期结果:
$ curl http://localhost:8000/GetSomeString && echo
"SomeString"
$ curl http://localhost:8000/GetNull && echo
null
$
实际结果:
$ curl http://localhost:8000/GetSomeString && echo
"SomeString"
$ curl http://localhost:8000/GetNull && echo
$
https://stackoverflow.com/questions/39065676
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