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ASP. NET MVC DropDownList Selected 关于Edit行动的价值工作,但不产生行动
原标题:ASP.NET MVC DropDownList SelectedValue works on Edit action, but not Create action

我在我的控制员(为埃德特和创建)中有以下守则:

model.Templates = new SelectList(PageManagementService.PageTemplateFetchList(), "PageId", "Title", 213);

“213”是一页的Id,只是用于测试。

我认为(为Edit和创建):

<%= this.Html.DropDownListFor(model => model.Page.TemplateId, this.Model.Templates)%>
<%= this.Model.Templates.SelectedValue %>

When I go to the Create form, I see the dropdown list, but the tag with value="213" is not selected. I even output the SelectedValue to make sure it s 213 - and I see 213.
When I go to the Edit form, I see the dropdown list, and the tag with value="213" is selected.

On the Create form, none of the tags have a "selected" attribute.
On the Edit form, the tag with value="213" has the "selected" attribute.

我失踪了吗? 怎样才能做到这一点? 没有人会看到这种行为?

<><>UPDATE: 改变除名名单的名称,使其发挥作用。 例如,而不是

<%= this.Html.DropDownListFor(model => model.Page.TemplateId, this.Model.Templates)%>

我这样做了。

<%= this.Html.DropDownList("somedropdown", this.Model.Templates)%>

它发挥了作用。 不清楚为什么......

问题回答

这可能是因为<代码>DataValue Field是一个示意图,可能在那里有某种不匹配之处。

类似情况:

model.Templates = new SelectList(PageManagementService.PageTemplateFetchList(), "PageId", "Title", "213");




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