我有一個方法來刪除對象。刪除不擁有自己的視圖,並且是「EditReport」中的「刪除」按鈕。成功刪除「報告」後的重定向。在ASP.NET Core 1.0中使用ModelState和RedirectToAction的異步
[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.NET Core 1.0(完全.NET Framework)中,我使用以下屬性在方法之間保存ModelState。我從這裏拿走了:https://stackoverflow.com/a/35987804/3878213
我最近轉向使用控制器,服務和存儲庫的異步方法。 在我看來,行動的屬性也應該是異步的。 起初,我重寫了代碼屬性如下:
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();
}
}
似乎合乎邏輯給我。但是這個代碼並不像我預期的那樣工作。 但是,下面的異步屬性都正常工作:
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();
}
}
請告訴我這兩個選項更正確?爲什麼沒有工作的第一個選項?
使用'await next();'在這裏不正確,因爲它導致該方法被多次命中。 –