如何在编辑模式 MVC 中将数据从数据库绑定到 DropDownList?
How to binding data from database to DropDownList in Edit Mode MVC?
我想将模型中的选定值数据绑定到视图中的下拉列表,但仍然无法正常工作。
在下拉列表中仍处于选中状态 "Select Business Unit"。
你有什么想法可以给我建议吗?
提前感谢您的帮助。
这是用户模型
public class UserModel
{
//public static ClaimsIdentity Identity { get; set; }
[Key]
public Int64 UserId { get; set; }
[Required]
public string UserCode { get; set; }
[Required]
public string UserName { get; set; }
[Required]
public string UserEmail { get; set; }
[Required]
public string UserPassword { get; set; }
[Required]
public string UserRole { get; set; }
[Required]
public string UserStatus { get; set; }
[Required]
public DateTime LastLogin_Date { get; set; }
[Required]
public string Create_By { get; set; }
[Required]
public DateTime Create_Date { get; set; }
[Required]
public string Update_By { get; set; }
[Required]
public DateTime Update_Date { get; set; }
public string BU_Code { get; set; }
public virtual BusinessUnitModel BusinessUnits { get; set; }
}
这是 BusinessUnitModel
public class BusinessUnitModel
{
public BusinessUnitModel()
{
this.Users = new HashSet<UserModel>();
this.Departments = new HashSet<DepartmentModel>();
}
[Key]
public string BU_Code { get; set; }
[Required]
public string BU_Name { get; set; }
[Required]
public string BU_Prefix { get; set; }
[Required]
public string BU_Type { get; set; }
[Required]
public string BU_Status { get; set; }
[Required]
public string Create_By { get; set; }
[Required]
public DateTime Create_Date { get; set; }
[Required]
public string Update_By { get; set; }
[Required]
public DateTime Update_Date { get; set; }
public virtual ICollection<UserModel> Users { get; set; }
public virtual ICollection<DepartmentModel> Departments { get; set; }
public virtual ICollection<StockModel> Stocks { get; set; }
}
这是用户控制器
* 我一直在更改代码 ViewBag.businessUnits ==> ViewBag.businessUnit *
public IActionResult Modify(Int64 id)
{
UserModel users = _user.GetAll(id);
ViewBag.businessUnit = new SelectList(_businessUnit.GetAll("A").Select(x => new
{
Value = x.BU_Code,
Text = x.BU_Name
}), "Value", "Text", users.BU_Code);
return View(users);
}
这是用户视图
<div class="col">
@Html.LabelFor(model => model.BusinessUnits, htmlAttributes: new { @class = "control-label" })
@Html.DropDownListFor(model => model.BusinessUnits, (IEnumerable<SelectListItem>)ViewBag.businessUnit, "Select Business Unit", new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.BusinessUnits)
</div>
ViewBag 变量应该是 ViewBag.businessUnit 而不是 usercontroller 的修改操作中的 ViewBag.businessUnits。请参阅下面的用户控制器代码。
public IActionResult Modify(Int64 id)
{
UserModel users = _user.GetAll(id);
ViewBag.businessUnit = new SelectList(_businessUnit.GetAll("A").Select(x => new
{
Value = x.BU_Code,
Text = x.BU_Name
}), "Value", "Text", users.BU_Code);
return View(users);
}
我想将模型中的选定值数据绑定到视图中的下拉列表,但仍然无法正常工作。
在下拉列表中仍处于选中状态 "Select Business Unit"。
你有什么想法可以给我建议吗?
提前感谢您的帮助。
这是用户模型
public class UserModel
{
//public static ClaimsIdentity Identity { get; set; }
[Key]
public Int64 UserId { get; set; }
[Required]
public string UserCode { get; set; }
[Required]
public string UserName { get; set; }
[Required]
public string UserEmail { get; set; }
[Required]
public string UserPassword { get; set; }
[Required]
public string UserRole { get; set; }
[Required]
public string UserStatus { get; set; }
[Required]
public DateTime LastLogin_Date { get; set; }
[Required]
public string Create_By { get; set; }
[Required]
public DateTime Create_Date { get; set; }
[Required]
public string Update_By { get; set; }
[Required]
public DateTime Update_Date { get; set; }
public string BU_Code { get; set; }
public virtual BusinessUnitModel BusinessUnits { get; set; }
}
这是 BusinessUnitModel
public class BusinessUnitModel
{
public BusinessUnitModel()
{
this.Users = new HashSet<UserModel>();
this.Departments = new HashSet<DepartmentModel>();
}
[Key]
public string BU_Code { get; set; }
[Required]
public string BU_Name { get; set; }
[Required]
public string BU_Prefix { get; set; }
[Required]
public string BU_Type { get; set; }
[Required]
public string BU_Status { get; set; }
[Required]
public string Create_By { get; set; }
[Required]
public DateTime Create_Date { get; set; }
[Required]
public string Update_By { get; set; }
[Required]
public DateTime Update_Date { get; set; }
public virtual ICollection<UserModel> Users { get; set; }
public virtual ICollection<DepartmentModel> Departments { get; set; }
public virtual ICollection<StockModel> Stocks { get; set; }
}
这是用户控制器
* 我一直在更改代码 ViewBag.businessUnits ==> ViewBag.businessUnit *
public IActionResult Modify(Int64 id)
{
UserModel users = _user.GetAll(id);
ViewBag.businessUnit = new SelectList(_businessUnit.GetAll("A").Select(x => new
{
Value = x.BU_Code,
Text = x.BU_Name
}), "Value", "Text", users.BU_Code);
return View(users);
}
这是用户视图
<div class="col">
@Html.LabelFor(model => model.BusinessUnits, htmlAttributes: new { @class = "control-label" })
@Html.DropDownListFor(model => model.BusinessUnits, (IEnumerable<SelectListItem>)ViewBag.businessUnit, "Select Business Unit", new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.BusinessUnits)
</div>
ViewBag 变量应该是 ViewBag.businessUnit 而不是 usercontroller 的修改操作中的 ViewBag.businessUnits。请参阅下面的用户控制器代码。
public IActionResult Modify(Int64 id)
{
UserModel users = _user.GetAll(id);
ViewBag.businessUnit = new SelectList(_businessUnit.GetAll("A").Select(x => new
{
Value = x.BU_Code,
Text = x.BU_Name
}), "Value", "Text", users.BU_Code);
return View(users);
}