C# MVC3 Dropdownlist在post中为空
我已经在这方面工作了好几天,但没有任何进展。我的电影模型在我的帖子中不断失败,这是因为我的dropdownlist值对于parentGenre是空的。我检查了firebug,并发布了正确的值。以下是我到目前为止的情况: 电影模式:C# MVC3 Dropdownlist在post中为空,c#,asp.net-mvc-3,razor,foreign-keys,html-select,C#,Asp.net Mvc 3,Razor,Foreign Keys,Html Select,我已经在这方面工作了好几天,但没有任何进展。我的电影模型在我的帖子中不断失败,这是因为我的dropdownlist值对于parentGenre是空的。我检查了firebug,并发布了正确的值。以下是我到目前为止的情况: 电影模式: public class Movies { public Movies() { this.inventory = new HashSet<Inventory>(); this.transactions =
public class Movies
{
public Movies()
{
this.inventory = new HashSet<Inventory>();
this.transactions = new HashSet<Transactions>();
}
[Key]
public int movieID { get; set; }
[Required(ErrorMessage = "Title is required")]
[StringLength(50)]
public String Title { get; set; }
[Required(ErrorMessage = "Director is required")]
[StringLength(30)]
public String Director { get; set; }
[Required(ErrorMessage = "An actor is required")]
[StringLength(30)]
public String Stars { get; set; }
[Required(ErrorMessage = "Description is required")]
[AllowHtml]
[Column(TypeName = "nvarchar(MAX)")]
public String Description { get; set; }
[Required(ErrorMessage = "Genre is required")]
public virtual Genres parentGenre { get; set; }
[Required(ErrorMessage = "Duration is required")]
public int Duration { get; set; }
[Required(ErrorMessage = "Rating is required")]
public String Rating { get; set; }
[Required(ErrorMessage="Release date is required")]
public DateTime releaseDate { get; set; }
public ICollection<Inventory> inventory { get; set; }
public ICollection<Transactions> transactions { get; set; }
}
视图:
总而言之,它点击if语句检查模型是否有效,但由于“parentGenres”为null而失败,即使该值是在firebug中发布的
编辑:整个视图:
@模型电影
@using (Html.BeginForm()) {
@Html.ValidationSummary(true, "Movie was not entered in system. Please correct the errors and try again.")
<div>
<div class="input-prepend">
<span class="add-on"><i class="icon-film"></i></span>
@Html.TextBoxFor(m => m.Title, new { placeholder = "Title" })
@Html.ValidationMessageFor(m => m.Title)
</div>
<div class="input-prepend">
<span class="add-on"><i class="icon-facetime-video"></i></span>
@Html.TextBoxFor(m => m.Director, new { placeholder = "Director" })
@Html.ValidationMessageFor(m => m.Director)
</div>
<div class="input-prepend">
<span class="add-on"><i class="icon-tags"></i></span>
@Html.DropDownList("parentGenre", String.Empty)
@Html.ValidationMessageFor(m => m.parentGenre)
</div>
<div class="input-prepend">
<span class="add-on"><i class="icon-star-empty"></i></span>
@Html.TextBoxFor(m => m.Stars, new { placeholder = "Actor" })
@Html.ValidationMessageFor(m => m.Stars)
</div>
<div class="input-prepend">
<span class="add-on"><i class="icon-time"></i></span>
@Html.TextBoxFor(m => m.Duration, new { @class="maskedDuration", placeholder = "Duration (mins)" })
@Html.ValidationMessageFor(m => m.Duration)
</div>
<div class="input-prepend">
<span class="add-on"><i class="icon-warning-sign"></i></span>
@Html.DropDownListFor(m => m.Rating, (SelectList)ViewBag.Ratings)
@Html.ValidationMessageFor(m => m.Rating)
</div>
<div class="input-prepend">
<span class="add-on"><i class="icon-calendar"></i></span>
@Html.TextBoxFor(m => m.releaseDate, new { @class="maskedDate", placeholder = "Release Date (mm/dd/yyyy)" })
@Html.ValidationMessageFor(m => m.releaseDate)
</div>
<div class="control-group">
<div class="input-prepend">
<span class="add-on"><i class="icon-comment"></i></span>
@Html.TextAreaFor(m => m.Description, new { placeholder = "Description", @class="input-xxlarge" })
@Html.ValidationMessageFor(m => m.Description)
</div>
</div>
<p><button class="btn btn-primary" type="submit" value="Submit">Submit</button></p>
@Html.ValidationSummary()
</div>
}
@使用(Html.BeginForm()){
@Html.ValidationSummary(true,“未在系统中输入电影。请更正错误并重试。”)
@TextBoxFor(m=>m.Title,新的{placeholder=“Title”})
@Html.ValidationMessageFor(m=>m.Title)
@TextBoxFor(m=>m.Director,新的{placeholder=“Director”})
@Html.ValidationMessageFor(m=>m.Director)
@Html.DropDownList(“parentgreen”,String.Empty)
@Html.ValidationMessageFor(m=>m.parentGene)
@TextBoxFor(m=>m.Stars,新的{placeholder=“Actor”})
@Html.ValidationMessageFor(m=>m.Stars)
@TextBoxFor(m=>m.Duration,新的{@class=“maskedDuration”,placeholder=“Duration(mins)”})
@Html.ValidationMessageFor(m=>m.Duration)
@DropDownListFor(m=>m.Rating,(SelectList)ViewBag.Ratings)
@Html.ValidationMessageFor(m=>m.Rating)
@Html.TextBoxFor(m=>m.releaseDate,新的{@class=“maskedDate”,placeholder=“发布日期(mm/dd/yyyy)”)
@Html.ValidationMessageFor(m=>m.releaseDate)
@text区域(m=>m.Description,新的{placeholder=“Description”,@class=“input xxlarge”})
@Html.ValidationMessageFor(m=>m.Description)
提交
@Html.ValidationSummary()
}
尝试将其更改为DropDownList for
@Html.DropDownListFor(m => m.parentGenre,
(SelectList) ViewBag.parentGenre, String.Empty)
除此之外,我强烈建议您也将selectlist的名称更改为parentGenreList
ViewBag.parentGenreList = new SelectList(movieRepository.Genres,
"genreId", "genreName");
因此,生成的助手调用将是
@Html.DropDownListFor(m => m.parentGenre,
(SelectList) ViewBag.parentGenreList , String.Empty)
原因是,如果“选择列表”和“绑定”属性共享的名称在视图呈现时经常与入站绑定冲突。addMovie创建选择列表,但不向视图发送模型。你有模型绑定吗?请添加整个视图。是否进行模型绑定?我看不到你的观点?我想因为名字是一样的它会绑定?我不能执行@Html.DropDownListFor(m=>m.parentgrove,String.empty),因为它会抛出一个错误。通常会。但是我不知道你是怎么用lambda的w/o来做绑定的。哦,糟糕,上面没有复制。我有@model MovieRental.Models.Movies。我将在上面编辑我的。数据绑定错误-流派模型不包含属性ParentGene,这对我来说没有任何意义,因为它应该在电影模型中查看。movieRepository.genres返回“get{return db.genres;}我进行了更新,这是相同的错误。这是因为我的存储库正在返回什么吗?当我这样做时,m.intellisense拾取parentGene.OIC,genres应该是一个id(int).你使用的是代码优先EF?是的,但为什么类型会是int?我认为它必须是类型类型,因为它是外键。代码优先是凝灰岩。我玩它是为了好玩,但我所有的项目都是db优先。你是对的,你需要导航,但你只能从下拉列表中获得id,而不是整个对象。
@Html.DropDownListFor(m => m.parentGenre,
(SelectList) ViewBag.parentGenre, String.Empty)
ViewBag.parentGenreList = new SelectList(movieRepository.Genres,
"genreId", "genreName");
@Html.DropDownListFor(m => m.parentGenre,
(SelectList) ViewBag.parentGenreList , String.Empty)