c# - 相当于ASP.NET MVC 5的HttpException的ASP.NET Core

在ASP.NET MVC 5中，您可以使用HTTP代码抛出HttpException，这将设置响应，如下所示:

throw new HttpException((int)HttpStatusCode.BadRequest, "Bad Request.");

HttpException在ASP.NET Core中不存在。等效代码是什么？

最佳答案

我实现了自己的HttpException和支持的中间件，该中间件可以捕获所有HttpException并将其转换为相应的错误响应。简短摘录如下。您也可以使用Boxed.AspNetCore Nuget包。

Startup.cs中的用法示例

public void Configure(IApplicationBuilder application)
{
    application.UseIISPlatformHandler();

    application.UseStatusCodePagesWithReExecute("/error/{0}");
    application.UseHttpException();

    application.UseMvc();
}

扩展方式

public static class ApplicationBuilderExtensions
{
    public static IApplicationBuilder UseHttpException(this IApplicationBuilder application)
    {
        return application.UseMiddleware<HttpExceptionMiddleware>();
    }
}

中间件

internal class HttpExceptionMiddleware
{
    private readonly RequestDelegate next;

    public HttpExceptionMiddleware(RequestDelegate next)
    {
        this.next = next;
    }

    public async Task Invoke(HttpContext context)
    {
        try
        {
            await this.next.Invoke(context);
        }
        catch (HttpException httpException)
        {
            context.Response.StatusCode = httpException.StatusCode;
            var responseFeature = context.Features.Get<IHttpResponseFeature>();
            responseFeature.ReasonPhrase = httpException.Message;
        }
    }
}

HttpException

public class HttpException : Exception
{
    private readonly int httpStatusCode;

    public HttpException(int httpStatusCode)
    {
        this.httpStatusCode = httpStatusCode;
    }

    public HttpException(HttpStatusCode httpStatusCode)
    {
        this.httpStatusCode = (int)httpStatusCode;
    }

    public HttpException(int httpStatusCode, string message) : base(message)
    {
        this.httpStatusCode = httpStatusCode;
    }

    public HttpException(HttpStatusCode httpStatusCode, string message) : base(message)
    {
        this.httpStatusCode = (int)httpStatusCode;
    }

    public HttpException(int httpStatusCode, string message, Exception inner) : base(message, inner)
    {
        this.httpStatusCode = httpStatusCode;
    }

    public HttpException(HttpStatusCode httpStatusCode, string message, Exception inner) : base(message, inner)
    {
        this.httpStatusCode = (int)httpStatusCode;
    }

    public int StatusCode { get { return this.httpStatusCode; } }
}

从长远来看，我建议不要使用异常来返回错误。异常比从方法中返回错误要慢。