是否可以捕获无法处理的异常(在C#中)？

Question

我有一个捕获T的异常的泛型类:

    public abstract class ErrorHandlingOperationInterceptor<T> : OperationInterceptor where T : ApiException
    {
        private readonly Func<OperationResult> _resultFactory;

        protected ErrorHandlingOperationInterceptor(Func<OperationResult> resultFactory)
        {
            _resultFactory = resultFactory;
        }

        public override Func<IEnumerable<OutputMember>> RewriteOperation(Func<IEnumerable<OutputMember>> operationBuilder)
        {
            return () =>
            {
                try
                {
                    return operationBuilder();
                }
                catch (T ex)
                {
                    var operationResult = _resultFactory();
                    operationResult.ResponseResource = new ApiErrorResource { Exception = ex };
                    return operationResult.AsOutput();
                }
            };
        }
    }

使用特定异常的子类,例如

    public class BadRequestOperationInterceptor : ErrorHandlingOperationInterceptor<BadRequestException>
    {
        public BadRequestOperationInterceptor() : base(() => new OperationResult.BadRequest()) { }
    }

这一切似乎都很完美.但是,不知何故,在日志中(曾经,而不是每次)都是InvalidCastException:

System.InvalidCastException: Unable to cast object of type 'ErrorHandling.Exceptions.ApiException' to type 'ErrorHandling.Exceptions.UnexpectedInternalServerErrorException'.
   at OperationModel.Interceptors.ErrorHandlingOperationInterceptor`1.c__DisplayClass2.b__1() in c:\BuildAgent\work\da77ba20595a9d4\src\OperationModel\Interceptors\ErrorHandlingOperationInterceptor.cs:line 28

第28行是捕获.

我错过了什么？我做过一些非常愚蠢的事吗？

Answer 1

正如铁匠所说，你的T类型是ApiErrorResource。您在代码中的某个位置尝试使用ErrorHandlingOperationInterceptor不是Exception派生自 的来创建您的ApiErrorResource。

try
{
// throw Exception of some sort
}
catch (BadRequestException ex)
{
    BadRequestOperationInterceptor broi = new BadRequestOperationInterceptor ();
}
catch (Exception ex)
{
    // this is NOT right
    BadRequestOperationInterceptor broi = new BadRequestOperationInterceptor ();
}