Question

我的表单中有一个复选框字段。当编辑并重新提交表单时，始终传递给控制器的复选框的值为false。我正在使用ASP.Net MVC Core 2.2。

Edit.cshtml

<form asp-action="Edit">
    <table>
    <tr>
        <td><label for="default">Default</label></td>
        <td>@Html.CheckBoxFor(m => m.IsDefault, new { @checked = "checked", @class = "form-input-styled" })</td>
    </tr>
    <tr>
        <td><label for="standard">Standard</label></td>
        <td>@Html.CheckBoxFor(m => m.IsStandard, new { @checked = "checked", @class = "form-input-styled" })</td>
    </tr>
    <tr>
        <td><label for="emailed">Emailed</label></td>
        <td>@Html.CheckBoxFor(m => m.IsEmailed, new { @checked = "checked", @class = "form-input-styled" })</td>
    </tr>
    </table>
</form>

ViewModel.cs

public class ReprintEditViewModel
{
    public bool IsDefault { get; set; }
    public bool IsStandard { get; set; }
    public bool IsEmailed { get; set; }
}

Controller.cs

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Edit(int id, [Bind("Id,Date,PolicyNumber,OwnerName,SendTo,EmailAddress,ModifiedDate,LastModifiedBy,DeliveryMethod, Default, Standard, Emailed")] ReprintEditViewModel xrCertReprint)
    {
        if (ModelState.IsValid)
        {
                //string dm = string.Join(", ", DeliveryMethod);
                string dm = "";
                if (xrCertReprint.IsDefault == true)
                    dm = "Default";
                if (xrCertReprint.IsStandard == true)
                    if (dm.Length > 1)
                        dm = dm + ", " + "Standard";
                    else
                        dm = "Standard";
                if (xrCertReprint.IsEmailed == true)
                    if (dm.Length > 1)
                        dm = dm + ", " + "Emailed";
                    else
                        dm = "Emailed";

            return RedirectToAction(nameof(Index));
        }
        return View(xrCertReprint);
    }

我尝试了stackoverflow中列出的其他解决方案/方式。什么都没解决。我不确定自己做错了什么？

Answer 1

当前，您正在使用以下代码绑定数据：

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(int id, [Bind("Id,Date,PolicyNumber,OwnerName,SendTo,EmailAddress,ModifiedDate,LastModifiedBy,DeliveryMethod, Default, Standard, Emailed")] ReprintEditViewModel xrCertReprint)
{
    if (ModelState.IsValid)
    {
            //string dm = string.Join(", ", DeliveryMethod);
            string dm = "";
            if (xrCertReprint.IsDefault == true)
                dm = "Default";
            if (xrCertReprint.IsStandard == true)
                if (dm.Length > 1)
                    dm = dm + ", " + "Standard";
                else
                    dm = "Standard";
            if (xrCertReprint.IsEmailed == true)
                if (dm.Length > 1)
                    dm = dm + ", " + "Emailed";
                else
                    dm = "Emailed";

        return RedirectToAction(nameof(Index));
    }
    return View(xrCertReprint);
}

虽然模型ReprintEditViewModel具有属性IsDefault , IsStandard and IsEmailed，但属性未包含在Bind属性中。因此，MVC模型绑定程序将忽略这些属性，而仅绑定传入属性的属性。如果删除Bind属性，则由于MVC默认模型绑定程序的缘故，所有与Model中具有相同名称的属性都将绑定，并且您将获得值。

您可以使用this link

了解有关模型绑定的更多信息

Answer 2

原因是您的[Bind]属性未包含正确的属性名称。

[Bind]属性指定模型绑定中应包括模型的哪些属性。

更改为使用IsDefault, IsStandard, IsEmailed代替Default, Standard, Emailed

 [HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(int id, [Bind("Id,Date,PolicyNumber,OwnerName,SendTo,EmailAddress,ModifiedDate,LastModifiedBy,DeliveryMethod, IsDefault, IsStandard, IsEmailed")] ReprintEditViewModel xrCertReprint)

请参阅https://docs.microsoft.com/en-us/aspnet/core/mvc/models/model-binding?view=aspnetcore-2.2#bind-attribute

Razor复选框在ASP.Net Core 2.2 MVC中始终返回false

2 个答案: