需要一个完整的示例来处理未处理的异常，使用“ExceptionHandler”在ASP.NET Web Api？ [英] Need a complete sample to handle unhandled exceptions using "ExceptionHandler" in ASP.NET Web Api?

问题描述

我已经检查过此链接
http://www.asp.net/web-api/overview/web-api-routing-and-actions/web-api-global-error-handling 。
在这个链接中，他们提到这样

I had checked this link http://www.asp.net/web-api/overview/web-api-routing-and-actions/web-api-global-error-handling. In this link they mentioned like this

class OopsExceptionHandler : ExceptionHandler
{
    public override void HandleCore(ExceptionHandlerContext context)
    {
        context.Result = new TextPlainErrorResult
        {
            Request = context.ExceptionContext.Request,
            Content = "Oops! Sorry! Something went wrong." +
                      "Please contact [e-mail] so we can try to fix it."
        };
    }

    private class TextPlainErrorResult : IHttpActionResult
    {
        public HttpRequestMessage Request { get; set; }

        public string Content { get; set; }

        public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
        {
            HttpResponseMessage response = 
                             new HttpResponseMessage(HttpStatusCode.InternalServerError);
            response.Content = new StringContent(Content);
            response.RequestMessage = Request;
            return Task.FromResult(response);
        }
    }
}

我不知道如何在我的Web API操作中调用此类。所以可以使用这个 ExceptionHandler 给我完整的样本。

I don't know how to call this class in my Web API actions. So can any one give me the complete sample using this ExceptionHandler.

推荐答案

在您的WebApi配置中，您需要添加以下行：

In your WebApi config your need to add the line:

config.Services.Replace(typeof (IExceptionHandler), new OopsExceptionHandler());

还要确保您已经创建了实现IExceptionHandler的基础ExceptionHandler类：

Also make sure you have created the base ExceptionHandler class that implements IExceptionHandler:

public class ExceptionHandler : IExceptionHandler
{
    public virtual Task HandleAsync(ExceptionHandlerContext context, 
                                    CancellationToken cancellationToken)
    {
        if (!ShouldHandle(context))
        {
            return Task.FromResult(0);
        }

        return HandleAsyncCore(context, cancellationToken);
    }

    public virtual Task HandleAsyncCore(ExceptionHandlerContext context, 
                                       CancellationToken cancellationToken)
    {
        HandleCore(context);
        return Task.FromResult(0);
    }

    public virtual void HandleCore(ExceptionHandlerContext context)
    {
    }

    public virtual bool ShouldHandle(ExceptionHandlerContext context)
    {
        return context.ExceptionContext.IsOutermostCatchBlock;
    }
} 

请注意，这只会处理不是在其他地方处理（例如通过例外过滤器）。

Note that this will only deal with exceptions that are not handled elsewhere (e.g. by Exception filters).

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