我正在尝试从 .NET Core MVC 应用程序进行简单的 API 调用:
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://localhost:49897");
var response = client.GetAsync("some-route").Result;
var dataString = response.Content.ReadAsStringAsync().Result; // Unexpected data here. See below.
[...] // deserialize dataString
}
client.GetAsync(route)
成功命中一个 API 操作方法,该方法最终执行此操作:
public HttpResponseMessage Get([FromUri] BindingModel bindingModel)
{
List<SomeModel> resultObjects;
[...] // populate resultObjects with data
return Request.CreateResponse(HttpStatusCode.OK, resultObjects, new JsonMediaTypeFormatter());
}
但是 dataString
最终等于这个:
"{\"version\":{\"major\":1,\"minor\":1,\"build\":-1,\"revision\":-1,\"majorRevision\":-1,\"minorRevision\":-1},\"content\":{\"objectType\":\"System.Object, System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e\",\"formatter\":{\"indent\":false,\"serializerSettings\":{\"referenceLoopHandling\":0,\"missingMemberHandling\":0,\"objectCreationHandling\":0,\"nullValueHandling\":0,\"defaultValueHandling\":0,\"converters\":[],\"preserveReferencesHandling\":0,\"typeNameHandling\":0,\"metadataPropertyHandling\":0,\"typeNameAssemblyFormat\":0,\"typeNameAssemblyFormatHandling\":0,\"constructorHandling\":0,\"contractResolver\":null,\"equalityComparer\":null,\"referenceResolver\":null,\"referenceResolverProvider\":null,\"traceWriter\":null,\"binder\":null,\"serializationBinder\":null,\"error\":null,\"context\":{},\"dateFormatString\":\"yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFFK\",\"maxDepth\":null,\"formatting\":0,\"dateFormatHandling\":0,\"dateTimeZoneHandling\":3,\"dateParseHandling\":1,\"floatFormatHandling\":0,\"floatParseHandling\":0,\"stringEscapeHandling\":0,\"culture\":{}}}}}"
或者,以 JSON 格式:
{
version: {
major: 1,
minor: 1,
[...]
},
content: {
objectType: "System.Object, System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"
formatter: {
indent: false,
serializerSettings: {
[...]
}
}
}
}
我的模型列表根本不在那里。
返回的到底是什么,为什么我的模型列表不在响应中?我看过几个在线资源,我似乎按照他们展示的方式做事。这是一个非常实用的 API 调用,所以我不确定发生了什么。
最佳答案
What exactly is being returned, and why isn't my list of models in the response?
返回的是 HttpResponseMessage
的 JSON 序列化版本,因为虽然 Web API 2 专门处理这种类型,但 ASP.NET Core Web API 不会。
准确地说,ASP.NET Core web API supports returning the following types :
-
IActionResult
-
ActionResult<T>
- <任何其他类型>
前两个被特殊对待,但第三个导致该类型被 JSON 序列化并返回,正如您所见。
相比之下,Web API 2 supports the following special return types :
-
void
-
HttpResponseMessage
-
IHttpActionResult
- <任何其他类型>
正确的解决方案是更新您的代码以使用自定义 IActionResult
实现而不是返回原始 HttpResponseMessage
秒。 You may find this guide aids you in doing so - 特别是 Microsoft.AspNetCore.Mvc.WebApiCompatShim NuGet 包有一个 ResponseMessageResult class允许您从这个转换您的 Web API Controller 方法:
public HttpResponseMessage Foo(Bar quux)
{
return new BazHttpResponseMessage();
}
为此:
public IActionResult Foo(Bar quux)
{
return new ResponseMessageResult(new BazHttpResponseMessage());
}
这应该允许您当前的代码按原样工作。
关于c# - 数据模型未显示在 HttpResponseMessage 中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45226019/