Question

我试图在Asp.Net Core MVC中为我的控制器创建Exception filter，如下所示：

public class ControllerExceptionFilterAttribute : ExceptionFilterAttribute
{
    private readonly IHostingEnvironment _hostingEnvironment;

    public ControllerExceptionFilterAttribute(
        IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }

    public override void OnException(ExceptionContext context)
    {
        //How construct a temp data here which I want to pass to error page?
        var result = new ViewResult
        {
            ViewName = "Error"
        };

        context.ExceptionHandled = true; // mark exception as handled
        context.Result = result;
    }
}

我需要在OnException方法中使用TempData - 如何在此处为TempData设置一些异常信息？我已将此TempData用于某些通知。

缺少类似这样的内容：context.Controller.TempData["notification"] - 可能删除了控制器属性。

Answer 1

您可以使用ITempDataDictionaryFactory实现您正在寻找的内容，您可以通过依赖注入将其带入构造函数中。这有一个函数GetTempData，可用于访问您所指的TempData。以下是满足您需求的完整示例：

public class ControllerExceptionFilterAttribute : ExceptionFilterAttribute
{
    private readonly IHostingEnvironment _hostingEnvironment;
    private readonly ITempDataDictionaryFactory _tempDataDictionaryFactory;

    public ControllerExceptionFilterAttribute(
        IHostingEnvironment hostingEnvironment,
        ITempDataDictionaryFactory tempDataDictionaryFactory)
    {
        _hostingEnvironment = hostingEnvironment;
        _tempDataDictionaryFactory = tempDataDictionaryFactory;
    }

    public override void OnException(ExceptionContext context)
    {
        //How construct a temp data here which I want to pass to error page?
        var tempData = _tempDataDictionaryFactory.GetTempData(context.HttpContext);

        var result = new ViewResult
        {
            ViewName = "Error"
        };

        context.ExceptionHandled = true; // mark exception as handled
        context.Result = result;
    }
}

如何在Asp.Net Core中的ExceptionFilterAttribute中传递TempData

1 个答案: