ASP.Net Core 2.0-如何从中间件返回自定义json或xml响应? [英] ASP.Net Core 2.0 - How to return custom json or xml response from middleware?
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问题描述
在ASP.Net Core 2.0中,我试图返回带有状态代码的格式化为json或xml的消息.我从控制器返回自定义消息没有问题,但是我不知道如何在中间件中处理它.
In ASP.Net Core 2.0, I am trying to return a message formatted as json or xml with a status code. I have no problems returning a custom message from a controller, but I don't know how to deal with it in a middleware.
到目前为止,我的中间件类如下:
My middleware class looks like this so far:
public class HeaderValidation
{
private readonly RequestDelegate _next;
public HeaderValidation(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext httpContext)
{
// How to return a json or xml formatted custom message with a http status code?
await _next.Invoke(httpContext);
}
}
推荐答案
要填充中间件中的响应,请使用httpContext.Response
属性,该属性为此请求返回HttpResponse
对象.以下代码显示了如何使用JSON内容返回500个响应:
To fill response in middleware use httpContext.Response
property that returns HttpResponse
object for this request. The following code shows how to return 500 response with JSON content:
public async Task Invoke(HttpContext httpContext)
{
if (<condition>)
{
context.Response.StatusCode = 500;
context.Response.ContentType = "application/json";
string jsonString = JsonConvert.SerializeObject(<your DTO class>);
await context.Response.WriteAsync(jsonString, Encoding.UTF8);
// to stop futher pipeline execution
return;
}
await _next.Invoke(httpContext);
}
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