我将尝试使用下面的代码做文本框自动完成,但它给该线路上的错误文本框自动完成与MySQL作为数据库
ERROR :"Object reference not set to an instance of an object"
:
for (int count = 0; count < dt.Rows.Count; count++)
谁能请帮我?
private void tbMemberName_TextChanged_1(object sender, EventArgs e)
{
tbMemberName.AutoCompleteMode = AutoCompleteMode.Suggest;
tbMemberName.AutoCompleteSource = AutoCompleteSource.CustomSource;
AutoCompleteStringCollection namec = new AutoCompleteStringCollection();
//string search ="%"+ tbMemberName.Text +"%";
//string @Name = tbMemberName.Text;
String sql =
@"SELECT DISTINCT(member_Firstname +''+ member_Lastname) AS Name FROM members WHERE Name Like '%'+tbMemberName.Text+'%'";
DataTable dt = MemberFormHelper.GetData(sql, mf);
if (dt.Rows.Count >= 0)
{
for (int count = 0; count < dt.Rows.Count; count++)
{
namec.Add(dt.Rows[count][Name].ToString());
}
}
tbMemberName.AutoCompleteCustomSource = namec;
}
你确定'dt.Rows'不是NULL? – jao 2011-06-14 10:13:07
'dt'可能为空,这就是为什么错误 – V4Vendetta 2011-06-14 10:14:54