如何在Asp.Net Core中的ExceptionFilterAttribute中傳遞TempData

Question

我試圖像這樣在Asp.Net Core MVC中為我的控制器創建Exception filter ：

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方法中與TempData一起TempData -如何在該位置為TempData設置一些異常信息？ 我已經將此TempData用於一些通知。

缺少這樣的內容： context.Controller.TempData["notification"] -控制器屬性可能已刪除。

Answer 1

您可以使用ITempDataDictionaryFactory實現所需的ITempDataDictionaryFactory ，可以通過依賴注入將其納入構造函數。 它只有一個函數GetTempData ，可用於訪問您稱為TempData 。 這是一個滿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;
    }
}