发布后视图中未更新的模型的表单值
[英]Form Values from Model Not Updating in View After Post
问题描述
I believe I'm missing something quite trivial here, but I'm not spotting it. 
我相信我在这里错过了一些琐碎的事情，但是我没有发现它。 I have a Post method, which modifies a Model property. 我有一个Post方法，可以修改Model属性。 I then want that model property to reflect the new property value. 然后，我希望该模型属性反映新的属性值。 So here are the pieces: 所以这是碎片：
Controller: 控制器：
[HttpPost]
public ActionResult Index(HomeModel model)
{
ModelState.Clear(); //Didn't help
model.MyValue = "Hello this is a different value";
return View(model);
}
Model: 模型：
public class HomeModel
{
[Display(Name = "My Message")]
public string MyValue { get; set; }
}
View: 视图：
@model MyApp.Models.HomeModel
@{
ViewBag.Title = "My MVC App";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title></title>
</head>
<body>
<div>
@using (Html.BeginForm("Index", "Home"))
{
<h5>Hello</h5>
<input id="SendMessage" type="submit" value="Send Message"/>
@Html.LabelFor(m => m.MyValue)
}
</div>
</body>
</html>
When I debug the controller I can see the updated model, but my LabelFor always has the Display attribute as opposed to the value I provided of "Hello this is a different value" . 当我调试控制器时，我可以看到更新的模型，但是我的LabelFor始终具有Display属性，而不是我提供的"Hello this is a different value" 。 What am I missing here that this label is not updated? 我在这里想念的是这个标签没有更新吗？
3 个解决方案
解决方案1
4 已采纳 2013-11-08 15:24:12
@Html.LabelFor displays your property name (or the name defined in your DisplayAttribute ), whereas @Html.DisplayFor displays your property content. @Html.LabelFor显示您的属性名称（或在DisplayAttribute定义的名称），而@Html.DisplayFor显示您的属性内容。 If your want "Hello this is a different value" displays, replace @Html.LabelFor by @Html.DisplayFor 如果要显示"Hello this is a different value" ，请用@Html.LabelFor替换@Html.DisplayFor
解决方案2
2 2013-11-08 15:24:12
The html helper look at the ModelState when binding their values and then in the model. html帮助程序在绑定它们的值时然后在模型中查看ModelState 。
So if you intend to modify any of the POSTed values inside your controller action make sure you remove them from the model state first: 因此，如果您打算在控制器操作中修改任何POSTed值，请确保首先从模型状态中将其删除：
ModelState.Remove("PropertyName");
Read this MVC 3 - Html.EditorFor seems to cache old values after $.ajax call 阅读此MVC 3-Html.EditorFor似乎在$ .ajax调用后缓存旧值
解决方案3
1 2013-11-08 15:24:10
That's the purpose of LabelFor , display the property name. 这就是LabelFor的目的，显示属性名称。 Either use EditorFor or just access the model property directly inside a label tag it to your view 使用EditorFor或直接在label内直接访问模型属性，将其标记为视图
<h5>Hello</h5>
<input id="SendMessage" type="submit" value="Send Message"/>
<label>@Model.MyValue</label>
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