未定义构造函数
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我在查询数据库时,运行出现"OleDbDataReader dr = new OleDbDataReader();"中的new,说是未定义构千函数,请问怎么回事.编写代码如下:
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OleDbConnection con = admin.GetConnection();
con.Open();
try
{
OleDbCommand cmd = new OleDbCommand("select className,saveFolder from class", con);
OleDbDataReader dr = new OleDbDataReader();
dr = cmd.ExecuteReader(); //返回SqlDataReader集
while (dr.Read())
{
if (txtclassName.Text.Trim() == dr[i].ToString() || txtFolder.Text.Trim() == dr[i].ToString())
{
flag = false;
//Response.Write("频道名称或静态文件目录已经存在!");
return;
}
i++;
}
dr.Close();
}
catch (HttpException a)
{ }