从另一个模型视图将数据插入数据库

Posted 2023-04-01

【中文标题】从另一个模型视图将数据插入数据库

【英文标题】：Insert data into database from another models view

【发布时间】：2020-02-29 17:37:26

【问题描述】：

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

【问题讨论】：

您必须将 BookModel 的强制属性作为隐藏属性传递，或者在模态表单帖子中传递带有属性名称的参数。

@Jaggan_j 我需要将格式添加为新实体，并且用户必须在插入新格式后从下拉列表中选择图书

【参考方案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
                     

【讨论】：

谢谢，我应该将我的 Viewmodel 传递给 Controller 吗？ ViewModel 属性是否包含 Book 和 FormatValue？

不是整个 ViewModel，只是上面显示的属性

【参考方案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;

【讨论】：

ViewModel 的目的往往是在同一个视图中包含多个模型，所以你的第二个是正确的。