C＃MVC DropDownList验证

如何解决C＃MVC DropDownList验证

我有几个DropDownLists，我想让它们成为必需项。我没有使用强类型的视图和视图模型。两者都从数据库填充。

// in controller 
while (reader.Read())
{
    emps.Add(new SelectListItem
    {
       Text = reader["CODE"].ToString(),Selected = Request["vEmps"] == reader["CODE"].ToString() ? true : false
    });
}

// in view
@Html.DropDownList("vEmps",null,new { @id = "Code" })

解决方法

您不能使下拉项成为必需项。您只能创建下拉列表。尝试使用this method，并使用“ required”，“ required”填充属性参数

使用类似的东西：

@Html.DropDownList("vEmps",new SelectListItem[] {
    new SelectListItem("Employee1","Employee1"),new SelectListItem("Employee2","Employee2"),new SelectListItem("Employee3","Employee3"),new SelectListItem("Employee4","Employee4") },null,new { required = "required" })

它将像这样渲染html

<select id="vEmps" name="vEmps" required="required">
<option value="Employee1">Employee1</option>
<option value="Employee2">Employee2</option>
<option value="Employee3">Employee3</option>
<option value="Employee4">Employee4</option>
</select>