c# - 当我回发到 Controller 时，模型的所有值均为空

Question

我已将模型切回到一个字段:

//型号

public class LetterViewModel
{
    public string LetterText;
}

// Controller

public ActionResult Index()
{
    var model = new LetterViewModel();
    model.LetterText = "Anything";

    return View(model);
}

[HttpPost]
public ActionResult Index(LetterViewModel model)
{ 
    //model.LetterText == null
    return View(model);
}

//查看

@model Test.Models.LetterViewModel
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
    ViewBag.Title = "Create a Letter";
}
@using (Html.BeginForm())
{
    <div id="Bottom">
        @Html.TextAreaFor(m => m.LetterText)
        <input type="submit" value="Ok" class="btn btn-default" />
    </div>
}

当我检查开发工具中的“网络”选项卡时，它显示输入的值已包含在请求中。但是，当 HttpPost Controller 被触发时，该字段为空。

Answer 1

DefaultModelBinder 不设置字段的值，仅设置属性。您需要更改模型以包含属性

public class LetterViewModel
{
    public string LetterText { get; set; } // add getter/setter
}