如何根据另一个组合框的选定值填充组合框 [英] how to fill a combobox based on selected value of another combobox

问题描述

我想使用两个组合框.
这两个组合框数据都从数据库填充.

我希望第二个组合框根据第一个组合框的选定值进行填充.



请提供正确的代码.

I want to use two comboboxes.
Both combobox data fill from database.

I want second combobox to populate based on selected value from the first combobox.



Please give proper code.

推荐答案

在第一个的selectedItemChanged事件上，使用第一个组合的selectedValue作为参数调用数据库调用，以加载第二个组合的值.

例如:

On selectedItemChanged event of the first you load the values of the second combo, using the selectedValue of the first as parameter to your database call.

Ex:

protected void ddlCity_SelectedIndexChanged(object sender, System.EventArgs e)
{
    
        ddlStreet.DataSource = Dal.GetStreetsByCity(ddlCity.SelectedItem.Text);
        ddlStreet.DataTextField = "streetName";
        ddlStreet.DataValueField = "idStreet";
        ddlStreet.DataBind();
        
    }
}

Krauze写道:

请给正确的代码...

pls give proper code...

请不要索要现成的代码.

ComboBox类具有您所需要的全部内容，而MSDN提供了完整的文档(例如，请参见

Please don''t ask for ready-to-run code.

The ComboBox class has all you need and MSDN provides full documentation (see, for instance, the example in ComboBox Class[^] overview).

:)

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