C# MVC中DB文本、值的下拉列表
我对dropdownlist有问题。我想在selectedlist中显示文本,但选择Id。 如何实现视图?在视图中,我必须将所选数据保存到模型(odbiorca) 控制器:C# MVC中DB文本、值的下拉列表,c#,asp.net-mvc,database,drop-down-menu,C#,Asp.net Mvc,Database,Drop Down Menu,我对dropdownlist有问题。我想在selectedlist中显示文本,但选择Id。 如何实现视图?在视图中,我必须将所选数据保存到模型(odbiorca) 控制器: var odbiorca = dbU.Uczniowie.OrderBy(d => d.Nazwisko).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return Names var odbiorcaId= dbU.Uczniowie
var odbiorca = dbU.Uczniowie.OrderBy(d => d.Nazwisko).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return Names
var odbiorcaId= dbU.Uczniowie.OrderBy(d => d.Id).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return IDs
List<SelectListItem> items = new List<SelectListItem>();
for (int i=0;i<dbU.Uczniowie.Count();i++)
{
items.Add(new SelectListItem { Text = odbiorca[i], Value = odbiorcaId[i] });
}
ViewBag.odbiorca = items;
public ActionResult Index()
{
//Creates a example list with multiple "Uwaga" items,
//but you might want to pull the data from the database
List<Uwaga> UwagaList = new List<Uwaga>();
for (int i = 1; i <= 10; i++)
{
Uwaga item = new Uwaga();
item.Id = i;
item.odbiorca = "odbiorca " + i;
UwagaList.Add(item);
}
//Create a SelectList object, the first parameter is the list created above.
//The second parameter is the "id" key and the thirth
//parameter is the text you want to display in the dropdown.
var SelectList = new SelectList(UwagaList, "Id", "odbiorca");
//Fill the dropdownlist "odbiorca" using ViewData.
ViewData["odbiorca"] = SelectList;
}
我尝试了这个解决方案,但程序保存了文本,但没有保存值。
@DropDownList(“odbiorca”,“----”)两个linq语句返回相同的值
var odbiorca = dbU.Uczniowie.OrderBy(d => d.Nazwisko).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return Names
var odbiorcaId= dbU.Uczniowie.OrderBy(d => d.Id).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return IDs
这两个函数都返回一个列表,其中m.Nazwisko+“”+m.Imie
没有Id
您应该只使用一个查询来获取选择列表
var list = dbU.Uczniowie.Select(a => new {Text= a.Nazwisko + " " + a.Imie, Value = a.Id}).ToList();
ViewBag.odbiorca = list.Select(a => new SelectListItem{ Text = a.Text, Value = a.Value.ToString()});
试试这种方法。让我们以您的模型课为例:
public class Uwaga
{
[Key]
[Required]
public string Id { get; set; }
Required]
public string odbiorca { get; set; }
[Required]
public DateTime data { get; set; }
}
在视图中,您可以使用相同的帮助程序:@Html.DropDownList(“odbiorca”,“---”)
但是,在控制器中,您可以通过SelectList
对象设置“id”和“text”列。以控制器中的默认操作为例:
var odbiorca = dbU.Uczniowie.OrderBy(d => d.Nazwisko).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return Names
var odbiorcaId= dbU.Uczniowie.OrderBy(d => d.Id).Select(m => m.Nazwisko + " " + m.Imie).ToList(); //return IDs
List<SelectListItem> items = new List<SelectListItem>();
for (int i=0;i<dbU.Uczniowie.Count();i++)
{
items.Add(new SelectListItem { Text = odbiorca[i], Value = odbiorcaId[i] });
}
ViewBag.odbiorca = items;
public ActionResult Index()
{
//Creates a example list with multiple "Uwaga" items,
//but you might want to pull the data from the database
List<Uwaga> UwagaList = new List<Uwaga>();
for (int i = 1; i <= 10; i++)
{
Uwaga item = new Uwaga();
item.Id = i;
item.odbiorca = "odbiorca " + i;
UwagaList.Add(item);
}
//Create a SelectList object, the first parameter is the list created above.
//The second parameter is the "id" key and the thirth
//parameter is the text you want to display in the dropdown.
var SelectList = new SelectList(UwagaList, "Id", "odbiorca");
//Fill the dropdownlist "odbiorca" using ViewData.
ViewData["odbiorca"] = SelectList;
}
public ActionResult Index()
{
//创建包含多个“Uwaga”项的示例列表,
//但您可能希望从数据库中提取数据
List UwagaList=新列表();
对于(int i=1;i)如何在DropDownList中传递值,我看不到DropDownList接收ViewBag.odbiorca的视图