Question

.net 怎么样根据dropdownlist中索引改变来获取该值来判断

Answer 1

protected void Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
{
ddl_TaxType.AutoPostBack = True; //让DropDownList响应事件.
}

protected void ddl_TaxType_SelectedIndexChanged(object sender, System.EventArgs e)
{
string GetValue = "";
GetValue = ddl_TaxType.SelectedValue; //Value值
//GetValue = ddl_TaxType.SelectedItem.Text; //Text值
//GetValue = ddl_TaxType.SelectedItem.Value; //Value值
//GetValue = ddl_TaxType.Items(ddl_TaxType.SelectedIndex).Text; //Text值
//GetValue = ddl_TaxType.Items(ddl_TaxType.SelectedIndex).Value; //Value值
}

Answer 2

同楼上，
然后置dropdownlist控件的属性autopostback为true

Answer 3

selectedIndexChanged事件，把autoPostBack设为true

Answer 4

添加change事件