MVC3：发布后更新的值未反映在文本框中

发布于 2024-12-01 09:57:55 字数 987 浏览 2 评论 0原文

我在我的页面上显示数据集合。我显示每行的标签和文本框。

下面是我的视图中的示例代码：

@using (Html.BeginForm())
{
   <input type="submit" value="Ok" />
   @for (int index = 0; index < Model.Persons.Count; index++ )
   {
      @Model.Persons[index].Name
      @Html.TextBoxFor(m => Model.Persons[index].Amount)
   }
}

在 Post Action 中，我更新了 Amount（比如增加 5）。

    [HttpPost]
    public ActionResult Persons(PersonList presenter)
    {

        for (int index = 0; index < presenter.Persons.Count; index++)
        {
            presenter.Persons[index].Amount += 5;
        }
        return View(presenter);
    }

此更新金额不会反映在页面上。但是，如果我使用下面的代码，那么它会正确显示，

@Model.Persons[index].Amount

或者

<input type="text" id=@("Persons_" + index + "__Amount") name="Persons[@index].Amount " value="@Model.Persons[index].Amount" ></input>

我想知道这种行为的原因，为什么会发生？

任何帮助将不胜感激。

原文

I am showing a collection of data on my page. I am showing label and Textbox for each row.

Below is the sample code from my View:

@using (Html.BeginForm())
{
   <input type="submit" value="Ok" />
   @for (int index = 0; index < Model.Persons.Count; index++ )
   {
      @Model.Persons[index].Name
      @Html.TextBoxFor(m => Model.Persons[index].Amount)
   }
}

In the Post Action, I am update Amount (say increasing by 5).

    [HttpPost]
    public ActionResult Persons(PersonList presenter)
    {

        for (int index = 0; index < presenter.Persons.Count; index++)
        {
            presenter.Persons[index].Amount += 5;
        }
        return View(presenter);
    }

This updated amount is not reflected on the page.
However if I use below code then it is shown properly, like

@Model.Persons[index].Amount

<input type="text" id=@("Persons_" + index + "__Amount") name="Persons[@index].Amount " value="@Model.Persons[index].Amount" ></input>

I would like to the reason for such behaviour that why is it happening?

Any help would be appreciated.

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埖埖迣鎅 2024-12-08 09:57:55

在更新值之前，只需添加 ModelState.Clear()，更新您的集合并返回它。

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涙—继续流 2024-12-08 09:57:55

发布的值将覆盖视图模型值。在使用之前我已经有一个解决方法...

ModelState["Field"].Value = new ValueProviderResult("NewValue", "Field", CultureInfo.InvariantCulture);

我想在你的情况下（我不完全确定你的对象是什么）类似于

PersonCollection persons = (PersonCollection)ModelState["Persons"].Value.RawValue;
persons[index].Amount += 5;
ModelState["Persons"].Value = new ValueProviderResult(persons, "Persons", CultureInfo.InvariantCulture);

The posted values will override the viewmodel values. I've had a workaround for this before using...

ModelState["Field"].Value = new ValueProviderResult("NewValue", "Field", CultureInfo.InvariantCulture);

I guess in your case (and I'm not entirely sure what your object is) something along the lines of

PersonCollection persons = (PersonCollection)ModelState["Persons"].Value.RawValue;
persons[index].Amount += 5;
ModelState["Persons"].Value = new ValueProviderResult(persons, "Persons", CultureInfo.InvariantCulture);

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