遵循ASP.NET Web Api 2从头到尾构建REST服务一书,我遇到了一个名称空间错误,我无法解决HttpException引用的特定问题。
var httpException = exception as HttpException;
我正在使用C#,我只看到VB.NET中使用的样式,因此可能存在一些问题,即预期的语法风格。更正建议不断尝试小写h来生成httpException,但是HttpException是预期的
这是完整的代码:
using System.Net;
using System.Net.Http;
using System.Web; // bad practice: not usually supposed to be used on non
// web application projects
using System.Web.Http.ExceptionHandling;
using WebApi2Book.Data.Exceptions;
namespace WebApi2Book.Web.Common.ErrorHandling
{
public class GlobalExceptionHandler : ExceptionHandler
{
public override void Handle(ExceptionHandlerContext context)
{
var exception = context.Exception;
var httpException = exception as HttpException; <- red squiggle
if (httpException != null)
{
context.Result = new SimpleErrorResult(context.Request, (HttpStatusCode)httpException.GetHttpCode(), httpException.Message);
return;
}
if (exception is RootObjectNotFoundException)
{
context.Result = new SimpleErrorResult(context.Request, HttpStatusCode.NotFound, exception.Message);
return;
}
if (exception is ChildObjectNotFoundException)
{
context.Result = new SimpleErrorResult(context.Request, HttpStatusCode.Conflict, exception.Message);
return;
}
context.Result = new SimpleErrorResult(context.Request, HttpStatusCode.InternalServerError, exception.Message);
}
}
}