C# “错误”；发生引用完整性约束冲突"；_C#_Asp.net_Asp.net Mvc

C# “错误”；发生引用完整性约束冲突"；

c# asp.net asp.net-mvc

C# “错误”；发生引用完整性约束冲突"；,c#,asp.net,asp.net-mvc,C#,Asp.net,Asp.net Mvc,你能帮我查一下密码吗我有两种型号： public class Author { public int Id { get; set; } public string AuthorName { get; set; } public IEnumerable<Book> Books { get; set; } } public class Book { public int Id { get; set; } public string Title

你能帮我查一下密码吗

我有两种型号：

public class Author
{
    public int Id { get; set; }
    public string AuthorName { get; set; }

    public IEnumerable<Book> Books { get; set; }
}

public class Book
{
    public int Id { get; set; }
    public string Title { get; set; }
    public int YearPublish { get; set; }
    public int Price { get; set; }

    public int? AuthorId { get; set; } //FK
    public Author Author { get; set; } //navigation property
}

我的看法是：

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

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

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

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

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

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


书

@Html.ValidationSummary（true，“，new{@class=“text danger”}）
@Html.HiddenFor（model=>model.Id）
@LabelFor（model=>model.AuthorName，“AuthorName”，htmlAttributes:new{@class=“controllabel col-md-2”}）
@EditorFor（model=>model.AuthorName，new{htmlAttributes=new{@class=“form control”}）
@Html.ValidationMessageFor（model=>model.Author.AuthorName，“，new{@class=“text danger”}）
@LabelFor（model=>model.Title，htmlAttributes:new{@class=“controllabel col-md-2”}）
@EditorFor（model=>model.Title，new{htmlAttributes=new{@class=“form control”}）
@Html.ValidationMessageFor（model=>model.Title，“，new{@class=“text danger”}）
@LabelFor（model=>model.YearPublish，htmlAttributes:new{@class=“controllabel col-md-2”}）
@EditorFor（model=>model.YearPublish，new{htmlAttributes=new{@class=“form control”}}）
@Html.ValidationMessageFor（model=>model.YearPublish，“，new{@class=“text danger”}）
@LabelFor（model=>model.Price，htmlAttributes:new{@class=“controllabel col-md-2”}）
@EditorFor（model=>model.Price，new{htmlAttributes=new{@class=“form control”}）
@Html.ValidationMessageFor（model=>model.Price，“，new{@class=“text danger”}）

当我尝试单击“保存”按钮时（即使我不做任何更改），出现了一个错误：发生引用完整性约束冲突：关系一端的“Author.Id”属性值与另一端的“Book.authord”属性值不匹配。 dbBooks.Entry（book.State=EntityState.Modified中存在错误

如果我尝试添加

book.Author=null从逻辑上讲，我的AuthorNames开始消失
我还试图在Html.HiddenFor中添加一些内容，但可能我做了一些错误的事情，但没有任何更改。
嗯，您无法在书的编辑器视图中修改AuthorName。您需要另一个视图供作者修改
book.Author
-不能为null
，因为它具有导航属性，并且只能类似于只读模式。所以只需删除author.authorname的editormodel
已修改图书列表：
Book bookEdit = dbBooks.Books.ToList().Where(a => a.Id == id).SingleOrDefault();

看看你需要做什么，我现在知道了。您只需要选择所有作者的列表，在视图中，AuthorId book的字段中会自动选择名称。
使用创建一个新的表单组
<div class="form-group">
    @Html.LabelFor(model => model.AuthorId, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
           @(Html.DropDownListFor(p => p.AuthorId, (SelectList)ViewBag.Authors, new { @class = "form-control" }))
        @Html.ValidationMessageFor(model => model.AuthorId, "", new { @class = "text-danger" })
    </div>
</div>

再次感谢
但是使用DropDownList不允许我编辑作者的姓名。。但这个解决方案非常好
我需要编辑所有4个字段，如名称、标题、年份和价格
我尝试制作一些类似复合模型的东西：
public class BookAuthorCompositeModel
{
    public Author author { get; set; }
    public Book book { get; set; }
}

更改我的获取方法：
// GET: Books/Edit/5       
    public ActionResult Edit(int? id)
    {
        if (id == null)
        {
            return HttpNotFound();
        }
        var compModel = new BookAuthorCompositeModel();
        compModel.book = dbBooks.Books.ToList().Where(a => a.Id == id).SingleOrDefault();
        compModel.author = dbBooks.Authors.ToList().Where(x => x.Id == id).SingleOrDefault();


        return View(bookEdit);
    }

它显示了我所需要的一切（我点击“编辑”，查看有关姓名、头衔、年份和价格的信息）
我的看法是：
    @model BookStorage.Models.BookAuthorCompositeModel

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

<h2>Edit</h2>


@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

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

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

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

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


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

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

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

dbBooks.SaveChanges（）；导致错误。。
我认为使用这种ViewModel有助于编辑所有行，但它不会将数据共享到DB
也许你能帮个忙吗？
这可能不是问题，但我认为在编辑操作中，你应该查询该书的Id
，而不是AuthorId
：Book bookEdit=dbBooks.Books.Include（a=>a.Author）.Where（a=>a.Id==Id.Single（）谢谢！但是仍然不知道如何实现作者姓名（来自模型作者）的编辑以及图书模型的标题、年份等。。。
// GET: Books/Edit/5       
    public ActionResult Edit(int? id)
    {
        if (id == null)
        {
            return HttpNotFound();
        }
        var compModel = new BookAuthorCompositeModel();
        compModel.book = dbBooks.Books.ToList().Where(a => a.Id == id).SingleOrDefault();
        compModel.author = dbBooks.Authors.ToList().Where(x => x.Id == id).SingleOrDefault();


        return View(bookEdit);
    }

    @model BookStorage.Models.BookAuthorCompositeModel

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

<h2>Edit</h2>


@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

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

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

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

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


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

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

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

[HttpPost]
    public ActionResult Edit(Book book)
    {
        if (ModelState.IsValid)
        {
            dbBooks.Entry(BAmodel.book).State = EntityState.Modified;
            dbBooks.Entry(BAmodel.author).State = EntityState.Modified;

            dbBooks.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(book);
    }