在ASP中异步使用ModelState和RedirectToAction.NET Core 1.0
本文关键字:NET RedirectToAction Core ModelState ASP 异步 | 更新日期: 2023-09-27 18:03:39
我有一个方法来删除对象。删除没有自己的视图,并且是"EditReport"中的"Delete"按钮。成功移除"报告"上的重定向后。
[HttpPost]
[Route("{reportId:int}")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteReport(int reportId)
{
var success = await _reportService.DeleteReportControlAsync(reportId);
if (success == false)
{
ModelState.AddModelError("Error", "Messages");
return RedirectToAction("EditReport");
}
ModelState.AddModelError("OK", "Messages");
return RedirectToAction("Report");
}
在ASP。我使用以下属性在方法之间保存ModelState。我从这里拿走了:https://stackoverflow.com/a/35987804/3878213
我最近转而对控制器、服务和存储库使用异步方法。在我看来,动作的属性也应该是异步的。最初,我将代码属性重写如下:
public class SetTempDataModelStateAttribute : Attribute, IAsyncActionFilter
{
public async Task OnActionExecutionAsync(ActionExecutingContext filterContext, ActionExecutionDelegate next)
{
var controller = filterContext.Controller as Controller;
var modelState = controller?.ViewData.ModelState;
if (modelState != null)
{
var listError = modelState.ToDictionary(m => m.Key, m => m.Value.Errors
.Select(s => s.ErrorMessage)
.FirstOrDefault(s => s != null));
var listErrorJson = await Task.Run(() => JsonConvert.SerializeObject(listError));
controller.TempData["ModelState"] = listErrorJson;
}
await next();
}
}
public class RestoreModelStateFromTempDataAttribute : Attribute, IAsyncActionFilter
{
public async Task OnActionExecutionAsync(ActionExecutingContext filterContext, ActionExecutionDelegate next)
{
var controller = filterContext.Controller as Controller;
var tempData = controller?.TempData?.Keys;
if (controller != null && tempData != null)
{
if (tempData.Contains("ModelState"))
{
var modelStateString = controller.TempData["ModelState"].ToString();
var listError = await Task.Run(() =>
JsonConvert.DeserializeObject<Dictionary<string, string>>(modelStateString));
var modelState = new ModelStateDictionary();
foreach (var item in listError)
{
modelState.AddModelError(item.Key, item.Value ?? "");
}
controller.ViewData.ModelState.Merge(modelState);
}
}
await next();
}
}
这对我来说似乎是合乎逻辑的。但是这段代码并没有像我预期的那样工作。但以下异步属性工作正常:
public class SetTempDataModelStateAttribute : ActionFilterAttribute
{
public override async Task OnActionExecutionAsync(ActionExecutingContext filterContext, ActionExecutionDelegate next)
{
await base.OnActionExecutionAsync(filterContext, next);
var controller = filterContext.Controller as Controller;
var modelState = controller?.ViewData.ModelState;
if (modelState != null)
{
var listError = modelState.ToDictionary(m => m.Key, m => m.Value.Errors
.Select(s => s.ErrorMessage)
.FirstOrDefault(s => s != null));
var listErrorJson = await Task.Run(() => JsonConvert.SerializeObject(listError));
controller.TempData["ModelState"] = listErrorJson;
}
await next();
}
}
public class RestoreModelStateFromTempDataAttribute : ActionFilterAttribute
{
public override async Task OnActionExecutionAsync(ActionExecutingContext filterContext, ActionExecutionDelegate next)
{
await base.OnActionExecutionAsync(filterContext, next);
var controller = filterContext.Controller as Controller;
var tempData = controller?.TempData?.Keys;
if (controller != null && tempData != null)
{
if (tempData.Contains("ModelState"))
{
var modelStateString = controller.TempData["ModelState"].ToString();
var listError = await Task.Run(() =>
JsonConvert.DeserializeObject<Dictionary<string, string>>(modelStateString));
var modelState = new ModelStateDictionary();
foreach (var item in listError)
{
modelState.AddModelError(item.Key, item.Value ?? "");
}
controller.ViewData.ModelState.Merge(modelState);
}
}
await next();
}
}
请告诉我这两个选项哪个更正确?为什么第一种选择不起作用呢?
请告诉我这两个选项哪个更正确。
选项二更正确,因为它实际上是有效的——正如你已经注意到的。如果你不想继承它,他们会让它成为sealed
。在这种情况下使用ActionFilterAttribute
似乎是合适的。事实上,快速浏览一下@ repo就会发现,这实际上是一种非常常见的方法。
为什么第一个选项不工作?
没有调用base
调用。关键是base
调用中可能存在自定义实现中缺少的代码。点击这里查看