C# 同时使用 2 个 sqldatareader？

Question

您好，有没有办法同时使用两个 sqldatareader？

我正在编写一个程序

我遇到错误，因为我同时使用 2 个阅读器

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();
}

它给了我那个错误

There is already an open DataReader associated with this Command which must be closed first.

Answer 1

错误消息具有误导性。您必须拥有 MultipleActiveResultSets=True在您的连接字符串中设置，以便能够使用两个不同的阅读器发送两个单独的命令。