文本框自动完成与MySQL [英] Textbox autocomplete with MySQL
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问题描述
我想用下面的code做文本框自动完成,但它给错误
错误:对象未设置为一个对象的实例
在这条线:
的(诠释计数= 0; COUNT< dt.Rows.Count;计数++)
谁能帮帮我吗?
私人无效tbMemberName_TextChanged_1(对象发件人,EventArgs的)
{
tbMemberName.AutoCompleteMode = AutoCompleteMode.Suggest;
tbMemberName.AutoCompleteSource = AutoCompleteSource.CustomSource;
AutoCompleteStringCollection namec =新AutoCompleteStringCollection();
//字符串搜索=%+ tbMemberName.Text +%;
//字符串@Name = tbMemberName.Text;
字符串SQL =
@SELECT DISTINCT(member_Firstname +''+ member_Lastname)从成员的WHERE名称,比如名称'%'+ tbMemberName.Text +'%';
数据表DT = MemberFormHelper.GetData(SQL,MF);
如果(dt.Rows.Count> = 0)
{
对于(诠释计数= 0; COUNT< dt.Rows.Count;计数++)
{
namec.Add(dt.Rows [统计] [名]的ToString());
}
}
tbMemberName.AutoCompleteCustomSource = namec;
}
解决方案
尝试
的(诠释计数= 0; COUNT< dt.Rows.Count-1;计数++)
如果该行数是10,你从0需要循环到9(10-1)。
干杯
I am trying to do the text box autocomplete by using the code below, but it gives the error
ERROR :"Object reference not set to an instance of an object"
on this line:
for (int count = 0; count < dt.Rows.Count; count++)
Can anyone please help me?
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;
}
解决方案
Try
for (int count = 0; count < dt.Rows.Count-1; count++)
If the row count is 10, you need to loop from 0 to 9 (10-1).
Cheers
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