我有一个删除对象的方法.删除不属于视图,并且是“EditReport”中的“删除”按钮.成功删除“报告”上的重定向后.
[HttpPost] [Route("{reportId:int}")] [ValidateAntiForgeryToken] public IActionResult DeleteReport(int reportId) { var success = _reportService.DeleteReportControl(reportId); if (success == false) { ModelState.AddModelError("Error","Messages"); return RedirectToAction("EditReport"); } ModelState.AddModelError("OK","Messages"); return RedirectToAction("Report"); }
在ASP.NET MVC 5中,我使用以下属性在方法之间保存ModelState.我从这里开始:https://stackoverflow.com/a/12024227/3878213
public class SetTempDataModelStateAttribute : ActionFilterattribute { public override void OnActionExecuted(ActionExecutedContext filterContext) { base.OnActionExecuted(filterContext); filterContext.Controller.TempData["ModelState"] = filterContext.Controller.ViewData.ModelState; } } public class RestoreModelStateFromTempDataAttribute : ActionFilterattribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { base.OnActionExecuting(filterContext); if (filterContext.Controller.TempData.ContainsKey("ModelState")) { filterContext.Controller.ViewData.ModelState.Merge( (ModelStateDictionary)filterContext.Controller.TempData["ModelState"]); } } }
但是在ASP.NET MVC 6 RC 1(ASP.NET Core 1.0)中,此代码不起作用.
filterContext.Controller中的错误不包含TempData和ViewData的定义.
解决方法
感谢
answer,我意识到需要创建自己的代码ASP.NET Core 1.0(完整的.NET Framework 4.6.2)
public class SetTempDataModelStateAttribute : ActionFilterattribute { public override void OnActionExecuted(ActionExecutedContext filterContext) { base.OnActionExecuted(filterContext); var controller = filterContext.Controller as Controller; var modelState = controller?.ViewData.ModelState; if (modelState != null) { var listError = modelState.Where(x => x.Value.Errors.Any()) .ToDictionary(m => m.Key,m => m.Value.Errors .Select(s => s.ErrorMessage) .FirstOrDefault(s => s != null)); controller.TempData["ModelState"] = JsonConvert.SerializeObject(listError); } } } public class RestoreModelStateFromTempDataAttribute : ActionFilterattribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { base.OnActionExecuting(filterContext); 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 = 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); } } } }
代码的非同步版本ASP.NET Core 1.0(完整的.NET Framework 4.6.2)
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.Where(x => x.Value.Errors.Any()) .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,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(); } }
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