Asp.net mvc 3 在@html.dropdownlistfor中设置所选值

我的视图中有以下代码

 <td>@Html.DropDownListFor(e => e[0].Reason, new List<SelectListItem>
  (
   new[]
    {
       new SelectListItem { Text = " -Select- ", Value = "-Select-" },
       new SelectListItem { Text = " Price ", Value = "Price" },
       new SelectListItem { Text = " 3P ", Value = "3P" },
       new SelectListItem { Text = " Freight Collect ", Value = "Freight Collect" },
       new SelectListItem { Text = " Billing ", Value = "Billing" },
       new SelectListItem { Text = " Business Closure ", Value = "Business Closure" },
       new SelectListItem { Text = " Customer Service ", Value = "Customer Service" },
       new SelectListItem { Text = " Quality ", Value = "Quality" },
       new SelectListItem { Text = " Service ", Value = "Service" },
       new SelectListItem { Text = " Business Relocate ", Value = "Business Relocate" },
       new SelectListItem { Text = " Change in Relationships ", Value = "Change in Relationships" },
       new SelectListItem { Text = " Different Account Code ", Value = "Different Account Code" },
       new SelectListItem { Text = " Economic Downturn ", Value = "Economic Downturn" },
       new SelectListItem { Text = " BIC ", Value = "BIC" },
       new SelectListItem { Text = " Credit/Collections ", Value = "Credit/Collections" }

        }
        ))</td>

@Html.DropDownListFor（e=>e[0]。原因，新列表
(
新[]
{
新建SelectListItem{Text=“-Select-”，Value=“-Select-”}，
新建SelectListItem{Text=“Price”，Value=“Price”}，
新建SelectListItem{Text=“3P”，Value=“3P”}，
新建SelectListItem{Text=“运费到付”，Value=“运费到付”}，
新建SelectListItem{Text=“Billing”，Value=“Billing”}，
新建SelectListItem{Text=“Business Closure”，Value=“Business Closure”}，
新建SelectListItem{Text=“Customer Service”，Value=“Customer Service”}，
新建SelectListItem{Text=“Quality”，Value=“Quality”}，
新建SelectListItem{Text=“Service”，Value=“Service”}，
新建SelectListItem{Text=“业务重新定位”，Value=“业务重新定位”}，
新建SelectListItem{Text=“关系变更”，Value=“关系变更”}，
新建SelectListItem{Text=“不同帐户代码”，Value=“不同帐户代码”}，
新建SelectListItem{Text=“经济衰退”，Value=“经济衰退”}，
新建SelectListItem{Text=“BIC”，Value=“BIC”}，
新建SelectListItem{Text=“信用/收款”，Value=“信用/收款”}
}
))

每次页面加载时，所选值都会发生更改

你能告诉我如何设置所选的值吗

---

提前感谢。

您可以通过模型对象传递所选值。从action方法中，您可以返回模型对象，如下所示

model obj=new model();
obj.Reason="Price";
return view(obj)

在视图中，在加载自身时选择具有值的项目

“Price”

或者可以使用jquery设置所选值

$(document).ready(function(){
   $("#Reason").val("Price");
});

---

可以通过模型对象传递选定的值。从action方法中，您可以返回模型对象，如下所示

model obj=new model();
obj.Reason="Price";
return view(obj)

在视图中，在加载自身时选择具有值的项目

“Price”

或者可以使用jquery设置所选值

$(document).ready(function(){
   $("#Reason").val("Price");
});

---

如果要在视图中设置选定值：

@Html.DropDownListFor( e => e[0].Reason, new SelectList( new List<SelectListItem>(){
   new SelectListItem { Text = " -Select- ", Value = "-Select-" },
   new SelectListItem { Text = " Price ", Value = "Price" },
   new SelectListItem { Text = " 3P ", Value = "3P" },
   new SelectListItem { Text = " Freight Collect ", Value = "Freight Collect" },
   new SelectListItem { Text = " Billing ", Value = "Billing" },
   new SelectListItem { Text = " Business Closure ", Value = "Business Closure" },
   new SelectListItem { Text = " Customer Service ", Value = "Customer Service" },
   new SelectListItem { Text = " Quality ", Value = "Quality" },
   new SelectListItem { Text = " Service ", Value = "Service" },
   new SelectListItem { Text = " Business Relocate ", Value = "Business Relocate" },
   new SelectListItem { Text = " Change in Relationships ", Value = "Change in Relationships" },
   new SelectListItem { Text = " Different Account Code ", Value = "Different Account Code" },
   new SelectListItem { Text = " Economic Downturn ", Value = "Economic Downturn" },
   new SelectListItem { Text = " BIC ", Value = "BIC" },
   new SelectListItem { Text = " Credit/Collections ", Value = "Credit/Collections" }
    } , "Value", "Text", e[0].Reason ) )

@Html.DropDownListFor（e=>e[0]。原因，新选择列表（新列表（）{
新建SelectListItem{Text=“-Select-”，Value=“-Select-”}，
新建SelectListItem{Text=“Price”，Value=“Price”}，
新建SelectListItem{Text=“3P”，Value=“3P”}，
新建SelectListItem{Text=“运费到付”，Value=“运费到付”}，
新建SelectListItem{Text=“Billing”，Value=“Billing”}，
新建SelectListItem{Text=“Business Closure”，Value=“Business Closure”}，
新建SelectListItem{Text=“Customer Service”，Value=“Customer Service”}，
新建SelectListItem{Text=“Quality”，Value=“Quality”}，
新建SelectListItem{Text=“Service”，Value=“Service”}，
新建SelectListItem{Text=“业务重新定位”，Value=“业务重新定位”}，
新建SelectListItem{Text=“关系变更”，Value=“关系变更”}，
新建SelectListItem{Text=“不同帐户代码”，Value=“不同帐户代码”}，
新建SelectListItem{Text=“经济衰退”，Value=“经济衰退”}，
新建SelectListItem{Text=“BIC”，Value=“BIC”}，
新建SelectListItem{Text=“信用/收款”，Value=“信用/收款”}
}，“值”，“文本”，e[0]。原因）

---

对于控制器中的设置选定值，请选中回答：

如果要在视图中设置选定值：

@Html.DropDownListFor( e => e[0].Reason, new SelectList( new List<SelectListItem>(){
   new SelectListItem { Text = " -Select- ", Value = "-Select-" },
   new SelectListItem { Text = " Price ", Value = "Price" },
   new SelectListItem { Text = " 3P ", Value = "3P" },
   new SelectListItem { Text = " Freight Collect ", Value = "Freight Collect" },
   new SelectListItem { Text = " Billing ", Value = "Billing" },
   new SelectListItem { Text = " Business Closure ", Value = "Business Closure" },
   new SelectListItem { Text = " Customer Service ", Value = "Customer Service" },
   new SelectListItem { Text = " Quality ", Value = "Quality" },
   new SelectListItem { Text = " Service ", Value = "Service" },
   new SelectListItem { Text = " Business Relocate ", Value = "Business Relocate" },
   new SelectListItem { Text = " Change in Relationships ", Value = "Change in Relationships" },
   new SelectListItem { Text = " Different Account Code ", Value = "Different Account Code" },
   new SelectListItem { Text = " Economic Downturn ", Value = "Economic Downturn" },
   new SelectListItem { Text = " BIC ", Value = "BIC" },
   new SelectListItem { Text = " Credit/Collections ", Value = "Credit/Collections" }
    } , "Value", "Text", e[0].Reason ) )

@Html.DropDownListFor（e=>e[0]。原因，新选择列表（新列表（）{
新建SelectListItem{Text=“-Select-”，Value=“-Select-”}，
新建SelectListItem{Text=“Price”，Value=“Price”}，
新建SelectListItem{Text=“3P”，Value=“3P”}，
新建SelectListItem{Text=“运费到付”，Value=“运费到付”}，
新建SelectListItem{Text=“Billing”，Value=“Billing”}，
新建SelectListItem{Text=“Business Closure”，Value=“Business Closure”}，
新建SelectListItem{Text=“Customer Service”，Value=“Customer Service”}，
新建SelectListItem{Text=“Quality”，Value=“Quality”}，
新建SelectListItem{Text=“Service”，Value=“Service”}，
新建SelectListItem{Text=“业务重新定位”，Value=“业务重新定位”}，
新建SelectListItem{Text=“关系变更”，Value=“关系变更”}，
新建SelectListItem{Text=“不同帐户代码”，Value=“不同帐户代码”}，
新建SelectListItem{Text=“经济衰退”，Value=“经济衰退”}，
新建SelectListItem{Text=“BIC”，Value=“BIC”}，
新建SelectListItem{Text=“信用/收款”，Value=“信用/收款”}
}，“值”，“文本”，e[0]。原因）

对于控制器中的设置选定值，请检查答案：

确定，veena

我留下了一条评论，建议如果是我，我会怎么做。但是，您正在根据当前的实现寻找答案，因此，我现在对此有以下看法：

<td>
    @{ var reasonList = new List<SelectListItem>(new[] {
        new SelectListItem { 
            Text=" -Select-",
            Value="-Select- "
        },
        new SelectListItem { 
            Selected = Model[0].Reason.Equals("Price"), 
            Text=" Price",
            Value="Price"
        },
        new SelectListItem {
            Selected = Model[0].Reason.Equals("3P"),
            Text=" 3P",
            Value="3P"
        }
        // etc etc...
      });
    }
    @Html.DropDownListFor(m => m[0].Reason, reasonList)
</td>

@{var reasonList=新列表（新[]{
新建SelectListItem{
Text=“-Select-”，
Value=“-Select-”
},
新建SelectListItem{
所选=模型[0]。原因。等于（“价格”），
Text=“价格”，
Value=“价格”
},
新建SelectListItem{
所选=模型[0]。原因。等于（“3P”），
Text=“3P”，
Value=“3P”
}
//等等等等。。。
});
}
@Html.DropDownListFor（m=>m[0]。原因，原因列表）

但是，我强烈建议您将此逻辑向上移动到控制器/服务代码中，因为当包含此类代码时，视图实际上变得杂乱无章。我还强烈质疑以这种方式检查索引元素的理由。为了简洁起见，我假设您已经指定了索引[1]、[2]等。如果是这种情况，那么您应该真正使用foreach循环，并在代码中按顺序遍历元素。下面是一个例子

@Html.DropDownListFor(model => model.DataBaseFieldToPopulate, ViewBag.MyDropDownListDataWithASelectedItem, "Invitation to select something from the list", new { @class = "a_CSS_class_name_of_your_choosing" })