从另一个模型视图将数据插入数据库

Question

我的项目有两个模型类，

public class BookModel
{
    public Int64 ISBN { get; set; }
    public DateTime AddedDate { get; set; }
    public bool isActive { get; set; }
    public int Quantity { get; set; }
    public int? FormatID { get; set; }
    public virtual FormatModel Format { get; set; }
}

和

public class FormatModel
{
    public FormatModel()
    {
        Books = new HashSet<BookModel>();
    }

    public int ID { get; set; }
    public string Value { get; set; }

    public virtual ICollection<BookModel> Books { get; }
}

如果指定的格式不存在，我想在我的Create.cshtml 文件中创建一个模式来添加新格式。

如何为我的模态创建一个提交按钮以在FormatModel 中添加格式？

这是我的看法：

@model RookBookMVC.Models.BookModel

@{
    ViewBag.Title = "Create";
    Layout = "~/Views/Shared/_Layout.cshtml";
    ViewBag.ReturnUrl = "/Book/Create";
}

<h2>Create</h2>

@using (Html.BeginForm("Create", "Book", FormMethod.Post))
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>BookModel</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })

        <div class="form-group">
            @Html.LabelFor(model => model.FormatID, "FormatID", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="input-group col-md-10">
                @Html.DropDownList("FormatID", null, "Select Book Format", htmlAttributes: new { @class = "form-control" })
                <div class="input-group-append">
                    <button type="button" class="btn btn-secondary" data-toggle="modal" data-target="#exampleModalCenter">
                        Add New
                    </button>
                </div>
            </div>
            @Html.ValidationMessageFor(model => model.FormatID, "", new { @class = "text-danger" })
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ISBN, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ISBN, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ISBN, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Quantity, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Quantity, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Quantity, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

@using (Html.BeginForm("Create", "Format", FormMethod.Post))
{
    @Html.AntiForgeryToken()
    <div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
        <div class="modal-dialog modal-dialog-centered" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title" id="exampleModalLongTitle">Add New Format</h5>
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">&times;</span>
                    </button>
                </div>
                <div class="modal-body">
                    <div class="form-group">
                        @Html.LabelFor(model => model.Format.Value, htmlAttributes: new { @class = "control-label col-md-2" })
                        <div class="col-md-10">
                            @Html.EditorFor(model => model.Format.Value, new { htmlAttributes = new { @class = "form-control" } })
                            @Html.ValidationMessageFor(model => model.Format.Value, "", new { @class = "text-danger" })
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                    <input type="submit" value="Create Format" class="btn btn-default" />
                </div>
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

点击“创建格式”按钮后。它为 ModelState.IsValid 返回 false 并且不会将任何数据添加到我的数据库中

我应该怎么做才能使“创建格式”按钮为格式创建一个新实体并将其保存在我的数据库中？

对于 Additional 我需要通过单个页面创建两个模型

Answer 1

您可能必须创建一个视图模型并将视图模型属性作为参数传递给操作 - 格式/创建帖子。 ViewModel 属性：

public string FormatValue { get; set; }

模态视图：

@Html.EditorFor(model => model.FormatValue, new { htmlAttributes = new { @class = "form-control" } })

参数与从模态表单传递的视图模型属性同名的控制器代码：

[HttpPost]
public ActionResult Create(string formatValue)
{
  using (var dataContext = new YourDbContextModel())
  {
     FormatModel fmtModel = new FormatModel();
     fmtModel.Value = formatValue;
     // rest of your code to save data
  }                   
}

Answer 2

public class MYViewModel{   public string FormatValue { get; set; } }

创建.cshtml

@model MYViewModel

    <div>
      @Html.EditorFor(model => model.FormatValue, new { htmlAttributes = new { @class = "form-control" } })
    </div>

你的意思是这样的吗？ 或

 public class MYViewModel{   
  public string FormatValue { get; set; } 
  Public BookModel Book {get; set;}
}