[英]How to fill dropdownlist from a table with ID+First name+last name of a row
我使用此代码从表 sql 数据库中填充我的下拉列表。 我需要在下拉列表中显示每行的 id、FirstName 和 LastName。
例如:
1-Sara Sindra
2-Michel Lafra.
但我的代码只是 ID 显示在下拉列表中。
public void Load_Combo(string Query, ComboBox cb)
{
string ConnectionString = @"Data Source=.\sqlexpress;AttachDbFilename=|DataDirectory|\mydatabase.mdf;user id = sa;password = 1111111111";
SqlConnection connection = new SqlConnection();
cb.Items.Clear();
connection.ConnectionString = ConnectionString;
connection.Open();
SqlDataAdapter adaptor = new SqlDataAdapter(Query, connection);
DataTable dtt = new DataTable();
adaptor.Fill(dtt);
for (int i = 0; i < dtt.Rows.Count; i++)
cb.Items.Add(dtt.Rows[i][0].ToString());
connection.Close();
}
private void btn1_Click(object sender, EventArgs e)
{
Load_Combo("SELECT ID , FName + ' ' + LName AS Fullname FROM studentstbl", cmb_cash1);
}
您可以使用 string.Format 按顺序合并ID
和Full Name
,然后将生成的字符串附加到 ComboBox。
public void Load_Combo(string Query, ComboBox cb)
{
string ConnectionString = @"Data Source=.\sqlexpress;AttachDbFilename=|DataDirectory|\mydatabase.mdf;user id = sa;password = 1111111111";
SqlConnection connection = new SqlConnection();
cb.Items.Clear();
connection.ConnectionString = ConnectionString;
connection.Open();
SqlDataAdapter adaptor = new SqlDataAdapter(Query, connection);
DataTable dtt = new DataTable();
adaptor.Fill(dtt);
for (int i = 0; i < dtt.Rows.Count; i++)
cb.Items.Add(string.Format("{0}-{1}", dtt.Rows[i][0], dtt.Rows[i][1]));
}
connection.Close();
}
private void btn1_Click(object sender, EventArgs e)
{
Load_Combo("SELECT ID , FName + ' ' + LName AS Fullname FROM studentstbl", cmb_cash1);
}
在 for 循环之后而不是在 for 循环内进一步关闭连接。 见上面的片段
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