我想默认在选择列表中设置一个选定的值。
我这里有此选择列表:
@{
List
<SelectListItem>
dateEcheancierCc = new List
<SelectListItem>
();
foreach (var dateEch in arrayDateEcheancierCc)
{
dateEcheancierCc.Add(new SelectListItem() { Text = dateEch, Value = dateEch },"Value","Text","Selected-value-by-default");
}
<div class="md-select px-0" style="min-width:0px">
@Html.DropDownList("DateEche", dateEcheancierCc, new { @class = "form-conrol" })
</div>
}
在这里,我尝试设置默认选择“默认值”,但这对我不起作用,为什么?
以下是下拉列表:
@Html.DropDownList("DateEche", dateEcheancierCc, new { @class = "form-conrol" })
答案 0 :(得分:1)
dateEcheancierCc.Add(new SelectListItem() { Text = dateEch, Value = dateEch },"Value","Text","Selected-value-by-default");
更改为这样
dateEcheancierCc.Add(new SelectListItem() { Text = dateEch, Value = dateEch, Selected = true });
确保您设置为“ Selected = true”的项目是列表中唯一的项目
我不知道您的规则,但是您可以这样尝试
例如:我有一个数组{“ Jeffrey”,“ John”,“ Joe”,“ Josh”},我想将Jeffrey设置为默认选择
if (dateEch == "Jeffrey")
dateEcheancierCc.Add(new SelectListItem() { Text = dateEch, Value = dateEch, Selected = true });
else
dateEcheancierCc.Add(new SelectListItem() { Text = dateEch, Value = dateEch });
答案 1 :(得分:0)
如果您的视图具有模型,则可以这样使用
@Html.DropDownListFor(model => model.SelectedId, new SelectList(Model.SelectCollections, "Value", "Text", Model.ValueToBeSelectedInCollection))
答案 2 :(得分:0)
构建Selected=true
时需要添加SelectListItem
。
foreach (var dateEch in arrayDateEcheancierCc)
{
dateEcheancierCc.Add(new SelectListItem() { Text = dateEch, Value = dateEch ,Selected = true });
}
答案 3 :(得分:0)
如下所示替换您的DropdownList,
<div class="md-select px-0" style="min-width:0px">
@Html.DropDownList("DateEche",new SelectList(dateEcheancierCc,"Value","Text","Selected-value-by-default"), new { @class = "form-conrol" })
</div>
然后选择列表为
foreach (var dateEch in arrayDateEcheancierCc)
{
dateEcheancierCc.Add(
new SelectListItem() { Text = dateEch, Value = dateEch }
);
}