我想包裹我所有的http回复。
比如我们有一些返回JSON数据的操作:包装所有回复
public IActionResult Get()
{
var res = new
{
MessageBody = "Test",
SomeData = 1
};
return Ok(res);
}
我想我的回答是这样的:
{
"StatusCode":200,
"Result":
{
"MessageBody ":"Test",
"SomeData":1
}
}
如果有错误,那么响应必须包含在响应ErrorMessage
场。
在mvc 5中,我使用了DelegationHandler
,但是在asp.net内核中没有实现这个类。现在,我们必须使用中间件。
这是MVC 5代码:
public class WrappingHandler : DelegatingHandler
{
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var response = await base.SendAsync(request, cancellationToken);
return BuildApiResponse(request, response);
}
private static HttpResponseMessage BuildApiResponse(HttpRequestMessage request, HttpResponseMessage response)
{
object content;
string errorMessage = null;
if (response.TryGetContentValue(out content) && !response.IsSuccessStatusCode)
{
HttpError error = content as HttpError;
if (error != null)
{
content = null;
errorMessage = error.Message;
#if DEBUG
errorMessage = string.Concat(errorMessage, error.ExceptionMessage, error.StackTrace);
#endif
}
}
var newResponse = request.CreateResponse(response.StatusCode, new ApiResponse(response.StatusCode, content, errorMessage));
foreach (var header in response.Headers)
{
newResponse.Headers.Add(header.Key, header.Value);
}
return newResponse;
}
}
,并且对于asp.net芯中间件。在asp.net核心中没有TryGetContentValue
,HttpError
等东西。所以,我想先读响应体:
public class FormatApiResponseMiddleware
{
private readonly RequestDelegate _next;
public FormatApiResponseMiddleware(RequestDelegate next)
{
_next = next;
}
private bool IsSuccessStatusCode(int statusCode)
{
return (statusCode >= 200) && (statusCode <= 299);
}
public async Task Invoke(HttpContext context)
{
object content = null;
string errorMessage = null;
if (!IsSuccessStatusCode(context.Response.StatusCode))
{
content = null;
//how to get error
}
var body= context.Response.Body;
}
}
但是,Body
流具有CanRead
等于false
,我得到错误流不能被读取。如何正确包装回应?
你究竟想要完成什么?模型验证?异常处理? – Tseng
@Tseng我已更新问题,添加了一些细节。 – user348173