c# - 如何在 Asp.Net Core 的 ExceptionFilterAttribute 中传递 TempData

Question

我尝试在 Asp.Net Core MVC 中为我的 Controller 创建异常过滤器，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 - 如何在这个地方为 TempData 设置一些异常信息？我已将此 TempData 用于某些通知。

缺少这样的内容:context.Controller.TempData["notification"] - Controller 属性可能已被删除。

Answer 1

您可以使用 ITempDataDictionaryFactory 实现您想要的效果，您可以通过依赖注入(inject)将其带入构造函数。这有一个功能，GetTempData ，可用于访问您称为 TempData 的内容。这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;
    }
}