C#同时使用2个sqldatareader?
问题描述:
您好,有没有办法同时使用两个sqldatareader?
Hello is there a way to use two sqldatareader at same time ?
我正在编写程序
我因为同时使用2个阅读器而出现错误
and i got error because i use 2 readers at same
代码示例
SqlCommand LoadSilk = new SqlCommand("SELECT silk_own FROM SK_Silk WHERE JID = (SELECT JID FROM TB_User WHERE StrUserID = '"+ comboBox1.Text +"')", Connection);
SqlDataReader SilkReader = LoadSilk.ExecuteReader();
SqlCommand LoadCharacter = new SqlCommand("SELECT * FROM SRO_VT_SHARD.DBO._Char WHERE CharID IN (SELECT CharID FROM SRO_VT_SHARD.DBO._User WHERE UserJID = "+ JID +")", Connection);
SqlDataReader CharacterReader = LoadCharacter.ExecuteReader();
try
{
SilkReader.Read();
textBox5.Text = SilkReader[0].ToString();
Silk = SilkReader[0].ToString();
dataGridView1.Enabled = true;
button2.Enabled = true;
while (CharacterReader.Read()) {
dataGridView1.Rows.Add(CharacterReader["CharID"].ToString(), CharacterReader["CharName16"].ToString(), CharacterReader["CurLevel"].ToString());
}
log(comboBox1.Text + " account data loaded");
}
catch (Exception ex) {
log(ex.Message);
MessageBox.Show("Error");
} finally {
SilkReader.Close();
CharacterReader.Close();
}
它给了我这个错误
已经有一个与此命令相关联的打开的DataReader,必须先关闭.
There is already an open DataReader associated with this Command which must be closed first.
答
该错误消息具有误导性.您必须在连接字符串中设置 MultipleActiveResultSets = True
,才能使用两个不同的读取器发送两个单独的命令.
The error message is misleading. You must have MultipleActiveResultSets=True
set in your connection string to be able to send two seperate commands with two different readers.