[英]MVC5 dropdownlist validation
我正在尝试对MVC5中的下拉列表进行验证,即用户必须选择一个项目,但是我不确定该怎么做。 由于某种原因,我已经在Model类中创建了列表,但现在我不知道如何将[Require(ErrorMessage)]
应用于此程序
cshtml:
<label>Project Type:</label>
@Html.DropDownListFor(m => m.Project_Type, Project1.Models.Dropdowns.GetProjectType(), "--Project Type--", new { @class = "form-control" })
<h6 style="text-emphasis-color:red;text-decoration-color:red" class="error"> @Html.ValidationMessageFor(model => model.Project_Type)</h6>
模型:
public static IEnumerable<SelectListItem> GetProjectType()
{
List<SelectListItem> Project_Type = new List<SelectListItem>();
Project_Type.Add(new SelectListItem() { Text = "type1" });
Project_Type.Add(new SelectListItem() { Text = "type2" });
Project_Type.Add(new SelectListItem() { Text = "type3" });
Project_Type.Add(new SelectListItem() { Text = "type4" });
return Project_Type;
}
当我应用[Require()]时出现错误
错误图片
您需要将DD的值存储在如下变量中:
[Required(Errormessage="message")] // just add this in your model
public string Project_Type {get;set;}
并如下更改List
:
public static IEnumerable<SelectListItem> GetProjectType()
{
List<SelectListItem> Project_Type = new List<SelectListItem>();
Project_Type.Add(new SelectListItem() { Text = "type1",value="1" });
Project_Type.Add(new SelectListItem() { Text = "type2",value="2" });
Project_Type.Add(new SelectListItem() { Text = "type3",value="3" });
Project_Type.Add(new SelectListItem() { Text = "type4",value="4"});
return Project_Type;
}
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