如何在SelectListItem中正确设置所选项目？

debugcn 发表于 Dev

中央情报局

我建立了一个新的SelectListItem。我可以填充选项，但不会让我设置“选定项”：

模型值

Model.Clients.ClientId = 1
Model.Clients.Name = "Company 1"
Model.Clients.ClientId = 2
Model.Clients.Name = "Company 2"
Model.Clients.ClientId = 3
Model.Clients.Name = "Company 3"
Model.Clients.ClientId = 4
Model.Clients.Name = "Company 4"
Model.Clients.ClientId = 5
Model.Clients.Name = "Company 5"

Model.User.Client.ClientId = 3

DropDownListFor

@Html.DropDownListFor(model => model.User.Client, Model.Clients.Select(x => new SelectListItem
{
    Text = x.Name,
    Value = x.ClientId.ToString(),
    Selected = x.ClientId == Model.User.Client.ClientId
    }).ToList(),
    new { @class = "form-control" }
)

下拉列表HTML

<select class="form-control" id="User_Client" name="User.Client">
    <option value="1">Company 1</option>
    <option value="2">Company 2</option>
    <option value="3">Company 3</option>
    <option value="4">Company 4</option>
    <option value="5">Company 5</option>
</select>

我的代码应将选项3选中，但不是。

林

试试下面的代码：

@Html.DropDownListFor(model => model.User.Client.ClientId, 
new SelectList(Model.Clients,"ClientId","Name", Model.User.Client.ClientId), 
new { @class = "form-control" })

注意：您不能Client为DropDownList绑定类，您需要使用属性ClientId。

最好为所选客户端添加另一个属性。如下所示：

public class yourModel
{
   public int selectedClientId {get;set;}
   //
}

    @Html.DropDownListFor(model => model.selectedClientId, 
    new SelectList(Model.Clients,"ClientId","Name", Model.User.Client.ClientId), 
    new { @class = "form-control" })

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