Question

我有一个用于管理UserRoles的页面（将用户分配给角色），我想将我的角色的默认选择设置为特定角色，因为它是最常被用户添加的角色，但它不是列表中的第一个角色，这是我开始使用的。

默认情况下，我应该使用什么语法来选择角色列表中的其他项而不是Model.Roles.First（）。ID？或者这是浪费时间？

型号：

public class User
{
    public virtual int ID { get; set; }
    public virtual String LanID { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual Division Division { get; set; }
    public virtual Region Region { get; set; }
    public virtual Location Location { get; set; }
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
}

public class Role
{
    public virtual int ID { get; set; }
    public virtual String Name { get; set; }
    public virtual String Description { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual bool IncludeInReports { get; set; }
}

public class UserRole
{
    public virtual int ID { get; set; }
    public virtual User User { get; set; }
    public virtual Role Role { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual bool IsOmniscient { get; set; }
    public virtual bool IsReadOnly { get; set; }
    public virtual System.Nullable<DateTime> StartDateTime { get; set; }
    public virtual System.Nullable<DateTime> EndDateTime { get; set; }
}

视图模型：

public class UserRoleViewModel
{
    public int ID { get; set; }
    public List<User> Users { get; set; }
    public List<Role> Roles { get; set; }
    [Required]
    public int SelectedUserID { get; set; }
    [Required]
    public int SelectedRoleID { get; set; }
    [Required]
    public bool IsActive { get; set; }
    public bool IsReadOnly { get; set; }
    public bool IsOmniscient { get; set; }
    [DataType(DataType.Date)]
    public System.Nullable<DateTime> StartDateTime { get; set; }
    [DataType(DataType.Date)]
    public System.Nullable<DateTime> EndDateTime { get; set; }

}

查看：（Create.cshtml）

@model HolterManagementUI.Models.UserRoleViewModel
@{
    ViewBag.Title = "Create";
}

<h2>Create a User Role</h2>
@using (Html.BeginForm())
{

<table>
<tr>
    <td>Users</td>
    <td>
    @Html.DropDownListFor(h => h.SelectedUserID, new SelectList(Model.Users, "ID", "Description", Model.Users.First().ID))
    </td>
</tr>
<tr>
    <td>Roles</td>
    <td>
    @Html.DropDownListFor(h => h.SelectedRoleID, new SelectList(Model.Roles, "ID", "Description", Model.Roles.First().ID))
    </td>
</tr>
 <tr>
    <td>Read Only</td>
    <td>
    @Html.HiddenFor(h => h.ID)
    @Html.EditorFor(h => h.IsReadOnly)</td>
</tr>
<tr>
    <td>Can See Other Areas</td>
    <td>
    @Html.EditorFor(h => h.IsOmniscient)</td>
</tr>
 <tr>
    <td>Start Date & Time</td>
    <td>@Html.EditorFor(h => h.StartDateTime)</td>
</tr>
<tr>
    <td>End Date & Time</td>
    <td>@Html.EditorFor(h => h.EndDateTime)</td>
</tr>
</table>

<div class="buttongroup" align="left" style="margin-top: 50px">
    <input type="submit" name="submitButton" value="Save" />
    <button type="button" onclick="location.href='@Url.Action("List")'">Cancel</button>
</div>
}

Answer 1

您需要找到一种方法来了解哪个角色应该是默认角色，因此您要向bool IsDefault课程添加Role：

public class Role
{
    public virtual int ID { get; set; }
    public virtual String Name { get; set; }
    public virtual String Description { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual bool IncludeInReports { get; set; }
    public virtual bool IsDefault { get; set; }
}

并将您的观点更改为：

@Html.DropDownListFor(h => h.SelectedRoleID, new SelectList(Model.Roles, "ID", "Description", Model.Roles.First(x => x.IsDefault).ID))

修改

或者你可以将SelectedRoleID设置为默认值（如果没有设置 - 例如，如果用户正在编辑它，它可能已经预先设置了）并将其传递给您的视图，并更改您的查看：

@Html.DropDownListFor(h => h.SelectedRoleID, new SelectList(Model.Roles, "ID", "Description", Model.SelectedRoleID))

MVC4 SelectList Issue ...设置页面被删除时下拉列表的默认选择

1 个答案: