在razor中设置下拉选择值

我有一个月的下拉列表如下

var month=new SelectList(
        new List<SelectListItem>
        {
            new SelectListItem { Selected = true, Text = "All Months", Value = ""},
            new SelectListItem { Selected = false, Text = "January", Value = "01"},
            new SelectListItem { Selected = false, Text = "February", Value = "02"},
            new SelectListItem { Selected = false, Text = "March", Value = "03"},
            new SelectListItem { Selected = false, Text = "April", Value = "04"},
            new SelectListItem { Selected = false, Text = "May", Value = "05"},
            new SelectListItem { Selected = false, Text = "June", Value = "06"},
            new SelectListItem { Selected = false, Text = "July", Value = "07"},
            new SelectListItem { Selected = false, Text = "August", Value = "08"},
            new SelectListItem { Selected = false, Text = "September", Value = "09"},
            new SelectListItem { Selected = false, Text = "October", Value = "10"},
            new SelectListItem { Selected = false, Text = "November", Value = "11"},
            new SelectListItem { Selected = false, Text = "December", Value = "12"}

        }, "Value" , "Text", 1);
        @Html.DropDownList("drpMonth", @month, new { @class = "dropdown", @onchange = "OnDropdownChange(this.value,'month')", @selected = @ViewData["month"]})

var month=new SelectList(
新名单
{
新建SelectListItem{Selected=true，Text=“所有月份”，Value=”“}，
新建SelectListItem{Selected=false，Text=“一月”，Value=“01”}，
新建SelectListItem{Selected=false，Text=“二月”，Value=“02”}，
新建SelectListItem{Selected=false，Text=“March”，Value=“03”}，
新建SelectListItem{Selected=false，Text=“April”，Value=“04”}，
新建SelectListItem{Selected=false，Text=“May”，Value=“05”}，
新建SelectListItem{Selected=false，Text=“June”，Value=“06”}，
新建SelectListItem{Selected=false，Text=“July”，Value=“07”}，
新建SelectListItem{Selected=false，Text=“August”，Value=“08”}，
新建SelectListItem{Selected=false，Text=“septer”，Value=“09”}，
新建SelectListItem{Selected=false，Text=“十月”，Value=“10”}，
新建SelectListItem{Selected=false，Text=“11”，Value=“11”}，
新建SelectListItem{Selected=false，Text=“December”，Value=“12”}
}“价值”、“文本”，1）；
@DropDownList（“drpMonth”、@month、new{@class=“dropdown”、@onchange=“OnDropdownChange（this.value、'month'）”、@selected=@ViewData[“month”]}）

如何设置与ViewData[“月”]相等的选定值？

请尝试以下操作：

 @Html.DropDownList("drpMonth", new SelectList(month,"Value","Text",ViewData["month"]), new { @class = "dropdown", @onchange = "OnDropdownChange(this.value,'month')"})

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那是盖特尔