如何在返回对象的ASP.NET Core WebAPI控制器中引发异常？

rianjs 发表于 Dev

102

里安斯

在Framework WebAPI 2中，我有一个如下所示的控制器：

[Route("create-license/{licenseKey}")]
public async Task<LicenseDetails> CreateLicenseAsync(string licenseKey, CreateLicenseRequest license)
{
    try
    {
        // ... controller-y stuff
        return await _service.DoSomethingAsync(license).ConfigureAwait(false);
    }
    catch (Exception e)
    {
        _logger.Error(e);
        const string msg = "Unable to PUT license creation request";
        throw new HttpResponseException(HttpStatusCode.InternalServerError, msg);
    }
}

果然，我收到该消息的500错误。

如何在ASP.NET Core Web API中执行类似的操作？

HttpRequestException似乎不存在。我希望继续返回该对象而不是HttpRequestMessage。

片

那这样的事呢创建一个中间件，在其中您将暴露某些异常消息：

public class ExceptionMiddleware
{
    private readonly RequestDelegate _next;

    public ExceptionMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext context)
    {
        try
        {
            await _next(context);
        }
        catch (Exception ex)
        {
            context.Response.ContentType = "text/plain";
            context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;

            if (ex is ApplicationException)
            {
                await context.Response.WriteAsync(ex.Message);
            }
        }
    }
}

在您的应用中使用它：

app.UseMiddleware<ExceptionMiddleware>();
app.UseMvc();

然后在您的操作中引发异常：

[Route("create-license/{licenseKey}")]
public async Task<LicenseDetails> CreateLicenseAsync(string licenseKey, CreateLicenseRequest license)
{
    try
    {
        // ... controller-y stuff
        return await _service.DoSomethingAsync(license).ConfigureAwait(false);
    }
    catch (Exception e)
    {
        _logger.Error(e);
        const string msg = "Unable to PUT license creation request";
        throw new ApplicationException(msg);
    }
}

更好的方法是返回IActionResult。这样，您就不必抛出异常。像这样：

[Route("create-license/{licenseKey}")]
public async Task<IActionResult> CreateLicenseAsync(string licenseKey, CreateLicenseRequest license)
{
    try
    {
        // ... controller-y stuff
        return Ok(await _service.DoSomethingAsync(license).ConfigureAwait(false));
    }
    catch (Exception e)
    {
        _logger.Error(e);
        const string msg = "Unable to PUT license creation request";
        return StatusCode((int)HttpStatusCode.InternalServerError, msg)
    }
}

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