.net根据确定下拉框中的选中项

  //当DropDownList中有这个值时，默认选中，否则选中第一个
    private void setDropDownListValue(DropDownList drp, string value)
    {
        if (drp.Items.FindByValue(value) == null)
        {
            drp.SelectedIndex = 0;
        }
        else
        {
            drp.SelectedValue = value;
        }
    }

    //根据text确定下拉框中的选中项
    private void setDropDownListText(DropDownList drp, string text)
    {
        if (drp.Items.FindByText(text) == null)
        {
            drp.SelectedIndex = 0;
        }
        else
        {
            for (int i = 0; i < drp.Items.Count; i++)
            {
                if (drp.Items[i].Text == text)
                {
                    drp.SelectedIndex = i;
                    break;
                }
            }
        }
    }