[英]MVC 4 Simple Populate DropDown from database model
我覺得有點傻。
我正在嘗試使用拳擊作為功能示例來了解 MVC 4。
我在數據庫中有WeightCategories
( Heavyweights
等)和Boxers
。
看起來很簡單。 關系是拳擊手具有當前的體重類別,但是當我編輯時,我希望它能夠通過下拉菜單進行更改。
如果它是我在代碼中創建的列表,我知道該怎么做,但是我無法理解如何從WeightCategory
表“加載”列表並將其顯示在拳擊手的視圖/模型中。
所以,這是我的WeightCategory
項目的代碼:
[Table("WeightCategories")]
public class WeightCategory
{
[Key]
public int WeightCategoryId { get; set; }
public WEIGHT_CATEGORIES WeightCategoryType { get; set; }
[Display(Name = "Weight Category Name")]
[Required]
[MinLength(5)]
public string Name { get; set; }
[Display(Name = "Weight Limit In Pounds")]
public int? WeightLimit { get; set; }
}
這是拳擊手項目的代碼
[Table("Boxers")]
public class Boxer
{
[Key]
public int BoxerId { get; set; }
public WeightCategory CurrentWeightCategory { get; set; }
[Required]
public string Name { get; set; }
public int Wins { get; set; }
public int Losses { get; set; }
public int Draws { get; set; }
public int Kayos { get; set; }
}
在視圖中,我真的不知道如何解決這個問題,我很確定它不是自動的,我可能需要在控制器的某個地方加載表格......我正在尋找最佳實踐或其他東西。
在最后的視圖中是這樣的:
@Html.DropDownListFor(model => model.CurrentWeightCategory.WeightCategoryId,
new SelectList(Model.WeightCategories, "WeightCategoryId", "Name",
Model.WeightCategories.First().WeightCategoryId))
你可以設計一個視圖模型:
public class MyViewModel
{
public Boxer Boxer { get; set; }
public IEnumerable<SelectListItem> WeightCategories { get; set; }
}
然后讓您的控制器操作填充並將此視圖模型傳遞給視圖:
public ActionResult Edit(int id)
{
var model = new MyViewModel();
using (var db = new SomeDataContext())
{
// Get the boxer you would like to edit from the database
model.Boxer = db.Boxers.Single(x => x.BoxerId == id);
// Here you are selecting all the available weight categroies
// from the database and projecting them to the IEnumerable<SelectListItem>
model.WeightCategories = db.WeightCategories.ToList().Select(x => new SelectListItem
{
Value = x.WeightCategoryId.ToString(),
Text = x.Name
})
}
return View(model);
}
現在你的視圖變成了視圖模型的強類型:
@model MyViewModel
@Html.DropDownListFor(
x => model.Boxer.CurrentWeightCategory.WeightCategoryId,
Model.WeightCategories
)
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