复制的ModelState错误到TempData的＆安培;显示它们在视图 [英] Copy ModelState Errors to TempData & Display them In the view

问题描述

我的大部分动作方法返回的失败和成功的结果RedirectToAction PartialViews。对于这一点，我想模型状态错误复制到TempData的，所以我可以将它们显示给用户。我已经在所以这里阅读的几个问题和一些外部链接，但他们没有工作对我来说......我从MvcContrib装饰与 ModelStateToTempData 的ActionMethod属性，则显示它如下的观点：（这只是一个原型）

Most of my action methods return PartialViews on success and RedirectToAction results on failure. For that, I would like to copy the model state errors into TempData so I could display them to the user. I've read several questions here on SO and some external links but none of them worked for me... I'm decorating the ActionMethod with ModelStateToTempData attribute from MvcContrib, then displaying it as follows in the view: (this is just a prototype)

        @if (TempData.Count > 0)
        {
            foreach (var obj in TempData)
            {
                var errors = ((ModelStateDictionary)obj.Value).Values;
                foreach (var error in errors)
                {
                <div style="position:absolute; background:Black; color:White; top:250px; left:550px;">
                    <span style="margin-bottom:5px; display:block; height:25px;">@error.Value</span>
                </div>
                }
            }
        }

而不是显示错误本身，我不断收到 System.Web.Mvc.ValueProviderResult 。我知道这是完全错误的，最终我会希望模型状态错误渗入到TempData里面一本字典，但现在我只想在视图中显示的错误字符串。

Rather than displaying the error itself, I keep getting System.Web.Mvc.ValueProviderResult. I know this is all wrong, and eventually I would want to filter the model state errors into a dictionary inside the TempData but for now I just want to have the error string displayed in the view.

P.S：我一直试图做手工，而不MvcContrib属性，我得到了相同的结果。但我preFER用我自己的code，所以我可以有超过整个问题的更多控制。

P.S: I've tried to do it manually without the MvcContrib attribute, and I got the same result. But I do prefer to use my own code so I could have more control over the whole issue.

有什么建议？

推荐答案

好吧尝试一百万的事情后，我发现自己的答案...：）

Ok After trying a million things, I found the answer myself... :)

if (TempData["ModelErrors"] == null)
    TempData.Add("ModelErrors", new List<string>());
foreach (var obj in ModelState.Values)
{
    foreach (var error in obj.Errors)
    {
        if(!string.IsNullOrEmpty(error.ErrorMessage))
            ((List<string>)TempData["ModelErrors"]).Add(error.ErrorMessage);
    }
}
return RedirectToAction("Index", "Home");

和视图：

    <div id="validationMessages">
        @{
            var errors = (List<string>)TempData["ModelErrors"];
        }
        @if (errors != null && errors.Count() > 0)
        {
            <div style="position:absolute; background:Black; color:White; top:250px; left:550px;">
                @foreach (var error in errors)
                { 
                   <span style="margin-bottom:5px; display:block; height:25px;">@error</span> 
                }
            </div>
        }
    </div>

更新：

这是一个ActionFilter里面：

Here it is inside an ActionFilter:

public class CopyModelStateErrorsToTempData : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        //Only export when ModelState is not valid
        if (!filterContext.Controller.ViewData.ModelState.IsValid)
        {
            //Export if we are redirecting
            if ((filterContext.Result is RedirectResult) || (filterContext.Result is RedirectToRouteResult))
            {
                if (filterContext.Controller.TempData["ModelErrors"] == null)
                    filterContext.Controller.TempData.Add("ModelErrors", new List<string>());
                foreach (var obj in filterContext.Controller.ViewData.ModelState.Values)
                {
                    foreach (var error in obj.Errors)
                    {
                        if (!string.IsNullOrEmpty(error.ErrorMessage))
                            ((List<string>)filterContext.Controller.TempData["ModelErrors"]).Add(error.ErrorMessage);
                    }
                }
            }
        }

        base.OnActionExecuted(filterContext);
    }
}

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