UC知道CheckBoxList.Items.FindByValue 出现不解，求解疑！
来源：百度知道 编辑：UC知道 时间：2024/06/05 12:19:26
private void ReadPower(CheckBoxList CBoxList, string p)
{
// 清除所有记录
for (int i = 0; i < CBoxList.Items.Count; i++)
CBoxList.Items[i].Selected = false;
// 显示有效记录
string S = "SELECT item FROM DeveloperLink a INNER JOIN Developer b ON a.Item = b.ID " +
"WHERE (a.ItemID = " + DT.Rows[0]["id"].ToString() + ") AND (b.Class = (SELECT ID FROM Developer WHERE (Name LIKE '%" + p + "%') AND (Class = 0)))";
DataTable RPDT = VD.OpenDataSet(S).Tables[0];
if (RPDT.Rows.Count > 0)
for (int i = 0; i < RPDT.Rows.Count; i++)
{
string Sss = RPDT.Rows[i][0].ToString();
CBoxList.Items.FindByValue(Sss).Selected = true;
}
}
每次运行到 CBoxList.Items.FindByValue(Sss).Selected = true; 就出错！
出错信息
System.NullRefer
{
// 清除所有记录
for (int i = 0; i < CBoxList.Items.Count; i++)
CBoxList.Items[i].Selected = false;
// 显示有效记录
string S = "SELECT item FROM DeveloperLink a INNER JOIN Developer b ON a.Item = b.ID " +
"WHERE (a.ItemID = " + DT.Rows[0]["id"].ToString() + ") AND (b.Class = (SELECT ID FROM Developer WHERE (Name LIKE '%" + p + "%') AND (Class = 0)))";
DataTable RPDT = VD.OpenDataSet(S).Tables[0];
if (RPDT.Rows.Count > 0)
for (int i = 0; i < RPDT.Rows.Count; i++)
{
string Sss = RPDT.Rows[i][0].ToString();
CBoxList.Items.FindByValue(Sss).Selected = true;
}
}
每次运行到 CBoxList.Items.FindByValue(Sss).Selected = true; 就出错！
出错信息
System.NullRefer
CBoxList.Items.FindByValue(Sss)没有找到，所以你点Selected 是没有的，就报这个错误了！
你这个貌似是将查出来的全部选中吧，那就这样写吧
foreach(ListItem li in CBoxList.Items)
{
li.Selected =true;
}
应该是这样的，你调试下！