复选框和模型绑定的问题始终返回false

Question

我在后台遇到复杂的表格。
当通过[HTTP POST]将表格发送到服务器时，我的模型是错误的。 即使我选中复选框，我的模型也总是返回false。 希望你们能帮助我，我在这个问题上浪费了很多时间，却一无所获。

我的模型的一部分

<!-- language: lang-csharp -->
public class project{
    ......
    public List<Skill> Skills { get{....} set{}    }
public class Skill
{
    public int SkillId { get; set; }
    public string SkillName { get; set; }
    public string SkillNumber { get; set; }
    public bool IsChecked { get; set; }
    public HttpPostedFileBase files { get; set; }
}

我的观点

<!-- language: lang-razor -->
for (int i = 0; i < Model.Skills.Count; i++)
{
        <div class="form-group row">
            <div class="col-8">
                @Html.CheckBoxFor(model => model.Skills[i].IsChecked)
                @Html.LabelFor(model => model.Skills[i].IsChecked, Model.Skills[i].SkillName)
            </div>
            <div class="col-4">
                <input type="hidden" name="@Model.Skills[i].SkillId" id="@Model.Skills[i].SkillId"  />
            </div>
        </div>
 }

我的控制器的一部分

<!-- language: lang-csharp -->
foreach (Models.Skill skill in viewModel.Skills)
            {
                if (skill.IsChecked)
                {
                    if(skill.files.ContentLength > 0)
                    {
                        string fileName = skill.SkillNumber;
                        string filepath = (path + "/" + fileName);
                        skill.files.SaveAs(filepath);
                    }
                }
            }

如果你们需要更多信息，别忘了问。

已更新：

剃刀-cshtml视图

@using (Html.BeginForm())
{
    <div class="form-group">
        @Html.LabelFor(model => model.ProjectTitle)
        @Html.TextBoxFor(model => model.ProjectTitle, new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.ProjectTitle, String.Empty, new { @class = "form-text text-muted" })
    </div>
    <div class="form-group">
        @Html.LabelFor(model => model.ProjectDescriptionShort)
        @Html.TextBoxFor(model => model.ProjectDescriptionShort, new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.ProjectDescriptionShort, String.Empty, new { @class = "form-text text-muted" })
    </div>
    <div class="form-group">
        @Html.LabelFor(model => model.ProjectDescriptionFull)
        @Html.TextBoxFor(model => model.ProjectDescriptionFull, new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.ProjectDescriptionFull, String.Empty, new { @class = "form-text text-muted" })
    </div>
    <div class="form-group">
        @Html.LabelFor(Model => Model.ProjectTypes)<br />
        @Html.DropDownListFor(Model => Model.ProjectTypeId, Model.ProjectTypes, "Selectionnez une type de projet", new { @class = "form-control" })
        @Html.ValidationMessageFor(Model => Model.ProjectTypes, String.Empty, new { @class = "form-text text-muted" })
    </div>
    for (int i = 0; i < Model.Skills.Count; i++)
    {
            <div class="form-control">
                    @Html.CheckBoxFor(model => model.Skills[i].IsChecked)
                    @Html.LabelFor(model => model.Skills[i].IsChecked, Model.Skills[i].SkillName)
            </div>
        }
    <input type="submit" value="valider" />
}

控制器动作

[HttpPost]
public ActionResult Index(Models.Project viewModel)
{
    if (ModelState.IsValid)
    {
        Models.User user = (Models.User)Session["User"];
        Datas.DataSetProjectTableAdapters.tbProjectTableAdapter tbProjectTableAdapter = new Datas.DataSetProjectTableAdapters.tbProjectTableAdapter();
        tbProjectTableAdapter.Insert(
            viewModel.ProjectTitle
            , viewModel.ProjectDescriptionShort
            , viewModel.ProjectDescriptionFull
            , user.UserId
            , viewModel.ProjectTypeId
            );
        Datas.DataSetProject.tbProjectDataTable lastProjectEntry = tbProjectTableAdapter.GetDataByLastInsert();
        int projectId = (int)lastProjectEntry.Rows[0]["Id"];


        string path = Server.MapPath("~/App_Data/UploadedFiles/Project/" + viewModel.ProjectTitle);  // Give the specific path
        if (!(System.IO.Directory.Exists(path)))
        {
            System.IO.Directory.CreateDirectory(path);
        }
        else{}
        foreach (Models.Skill skill in viewModel.Skills)
        {
            if (skill.IsChecked)
            {
                if(skill.files.ContentLength > 0)
                {
                    ... not implented yet
                }
            }
        }
    }
    return View(viewModel);
}

查看模型c＃

public class Project
{
    [Required]
    public string ProjectTitle { get; set; }
    [Required]
    public string ProjectDescriptionShort { get; set; }
    [Required]
    public string ProjectDescriptionFull { get; set; }
    [Required]
    public int ProjectTypeId { get; set; }
    public IEnumerable<SelectListItem> ProjectTypes
    {
        get
        {
            Datas.DataSetProject.tbProjectTypeDataTable tbProjectTypes = new Datas.DataSetProjectTableAdapters.tbProjectTypeTableAdapter().GetData();
            List<SelectListItem> Items = new List<SelectListItem>();
            foreach(Datas.DataSetProject.tbProjectTypeRow row in tbProjectTypes)
            {
                Items.Add(new SelectListItem()
                {
                    Value = row.Id.ToString(),
                    Text = row.ProjectName
                });
            }
            return Items;
        }
        set { }
    }

    public List<Skill> Skills
    {
        get
        {
            Datas.DataSetProject.tbSkillDataTable tbSkills = new Datas.DataSetProjectTableAdapters.tbSkillTableAdapter().GetData();
            List<Skill> Items = new List<Skill>();
            foreach (Datas.DataSetProject.tbSkillRow row in tbSkills)
            {
                Items.Add(new Skill()
                {
                    SkillId = row.Id,
                    SkillName = row.SkillNumber + " - " + row.SkillName,
                    SkillNumber = row.SkillNumber

                });
            }
            return Items;
        }
        set { }
    }

}

public class Skill
{
    public int SkillId { get; set; }
    public string SkillName { get; set; }
    public string SkillNumber { get; set; }
    public bool IsChecked { get; set; }
    public HttpPostedFileBase files { get; set; }
}

Answer 1

您可以尝试使用下面的代码代替CheckboxFor吗？

@ Html.CheckBox（“ IsChecked”，model.Skills [i] .IsChecked）

让我知道您尝试这个问题后是否仍然遇到问题。

Answer 2

  

您应该发布所有的cshtml文件和http发布操作

剃刀-cshtml视图

@using (Html.BeginForm())
{
    <div class="form-group">
        @Html.LabelFor(model => model.ProjectTitle)
        @Html.TextBoxFor(model => model.ProjectTitle, new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.ProjectTitle, String.Empty, new { @class = "form-text text-muted" })
    </div>
    <div class="form-group">
        @Html.LabelFor(model => model.ProjectDescriptionShort)
        @Html.TextBoxFor(model => model.ProjectDescriptionShort, new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.ProjectDescriptionShort, String.Empty, new { @class = "form-text text-muted" })
    </div>
    <div class="form-group">
        @Html.LabelFor(model => model.ProjectDescriptionFull)
        @Html.TextBoxFor(model => model.ProjectDescriptionFull, new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.ProjectDescriptionFull, String.Empty, new { @class = "form-text text-muted" })
    </div>
    <div class="form-group">
        @Html.LabelFor(Model => Model.ProjectTypes)<br />
        @Html.DropDownListFor(Model => Model.ProjectTypeId, Model.ProjectTypes, "Selectionnez une type de projet", new { @class = "form-control" })
        @Html.ValidationMessageFor(Model => Model.ProjectTypes, String.Empty, new { @class = "form-text text-muted" })
    </div>
    for (int i = 0; i < Model.Skills.Count; i++)
    {
            <div class="form-control">
                    @Html.CheckBoxFor(model => model.Skills[i].IsChecked)
                    @Html.LabelFor(model => model.Skills[i].IsChecked, Model.Skills[i].SkillName)
            </div>
        }
    <input type="submit" value="valider" />
}

控制器操作

    [HttpPost]
    public ActionResult Index(Models.Project viewModel)
    {
        if (ModelState.IsValid)
        {
            Models.User user = (Models.User)Session["User"];
            Datas.DataSetProjectTableAdapters.tbProjectTableAdapter tbProjectTableAdapter = new Datas.DataSetProjectTableAdapters.tbProjectTableAdapter();
            tbProjectTableAdapter.Insert(
                viewModel.ProjectTitle
                , viewModel.ProjectDescriptionShort
                , viewModel.ProjectDescriptionFull
                , user.UserId
                , viewModel.ProjectTypeId
                );
            Datas.DataSetProject.tbProjectDataTable lastProjectEntry = tbProjectTableAdapter.GetDataByLastInsert();
            int projectId = (int)lastProjectEntry.Rows[0]["Id"];


            string path = Server.MapPath("~/App_Data/UploadedFiles/Project/" + viewModel.ProjectTitle);  // Give the specific path
            if (!(System.IO.Directory.Exists(path)))
            {
                System.IO.Directory.CreateDirectory(path);
            }
            else{}
            foreach (Models.Skill skill in viewModel.Skills)
            {
                if (skill.IsChecked)
                {
                    if(skill.files.ContentLength > 0)
                    {
                        ... not implented yet
                    }
                }
            }
        }
        return View(viewModel);
    }

查看模型c＃

public class Project
{
    [Required]
    public string ProjectTitle { get; set; }
    [Required]
    public string ProjectDescriptionShort { get; set; }
    [Required]
    public string ProjectDescriptionFull { get; set; }
    [Required]
    public int ProjectTypeId { get; set; }
    public IEnumerable<SelectListItem> ProjectTypes
    {
        get
        {
            Datas.DataSetProject.tbProjectTypeDataTable tbProjectTypes = new Datas.DataSetProjectTableAdapters.tbProjectTypeTableAdapter().GetData();
            List<SelectListItem> Items = new List<SelectListItem>();
            foreach(Datas.DataSetProject.tbProjectTypeRow row in tbProjectTypes)
            {
                Items.Add(new SelectListItem()
                {
                    Value = row.Id.ToString(),
                    Text = row.ProjectName
                });
            }
            return Items;
        }
        set { }
    }

    public List<Skill> Skills
    {
        get
        {
            Datas.DataSetProject.tbSkillDataTable tbSkills = new Datas.DataSetProjectTableAdapters.tbSkillTableAdapter().GetData();
            List<Skill> Items = new List<Skill>();
            foreach (Datas.DataSetProject.tbSkillRow row in tbSkills)
            {
                Items.Add(new Skill()
                {
                    SkillId = row.Id,
                    SkillName = row.SkillNumber + " - " + row.SkillName,
                    SkillNumber = row.SkillNumber

                });
            }
            return Items;
        }
        set { }
    }

}

public class Skill
{
    public int SkillId { get; set; }
    public string SkillName { get; set; }
    public string SkillNumber { get; set; }
    public bool IsChecked { get; set; }
    public HttpPostedFileBase files { get; set; }
}

Answer 3

问题在于您的视图仅显示每个技能的复选框并为其分配值。它没有将复选框直接绑定到正确的模型属性。请参阅有关为集合创建显示模板的文章。这是您需要采取的方向。从长远来看，它更易于维护和重用。

ASP.net MVC - Display Template for a collection

此外，看起来您在视图模型中的技能获取者只会返回一个全新的列表。这可能是控制器每次都获取所有错误的新列表的原因。尝试改为在视图模型的构造函数中构建列表，并使用默认的getter和setter。

Answer 4

有时 CheckboxFor 有一些匿名错误，请使用以下代码作为建议。

<input type="hidden" name="@model.Skills[i].SkillId" /> 

<input type="checkbox" name="@model.Skills[i].IsChecked" />