绑定到XmlDataSource时如何以编程方式设置Dropdownlist的SelectedValue [英] How to programmatically set SelectedValue of Dropdownlist when it is bound to XmlDataSource

问题描述

我使用 XmlDataSource 作为 dropdownlist 的 datasource.

I'm using XmlDataSource as the datasource for a dropdownlist.

现在我想在页面最初加载时设置下拉菜单的 SelectedValue.我已经尝试了下拉菜单的 OnDataBound 事件，我可以在其中看到总项目数.但是设置 SelectedValue 不起作用.在OnDataBinding 事件中，我什至看不到总项目数，可能是因为列表尚未绑定?

Now I want to set the SelectedValue of the drop down when the page initially loads. I have tried the OnDataBound event of the drop down in which I could see the total items. But setting the SelectedValue didn't work. InOnDataBinding event, I couldn't even see the total items probably because the list isn't bound yet?

如何根据值设置所选索引?

How can I set the selected index based on a value?

推荐答案

这似乎对我有用.

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            DropDownList1.DataBind(); // get the data into the list you can set it
            DropDownList1.Items.FindByValue("SOMECREDITPROBLEMS").Selected = true;
        }
    }

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