|
代码一：
private void Form1_Load(object sender, EventArgs e)
{
dataGridView1.DataSource = GetData();
}
private DataTable GetData()
{
DataTable dt = new DataTable();
using (SqlConnection connection
= new SqlConnection("ConnectionString"))
using (SqlCommand command = new SqlCommand())
{
command.Connection = connection;
command.CommandText = "SELECT * FROM Customers";
connection.Open();
using (SqlDataReader reader =
command.ExecuteReader
(CommandBehavior.CloseConnection))
{
dt.Load(reader);
}
}
return dt;
}
代码二：
private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Load(GetReader());
dataGridView1.DataSource = dt;
}
private IDataReader GetReader()
{
DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(string));
dt.Columns.Add("Firstname", typeof(string));
dt.Columns.Add("Lastname", typeof(string));
dt.Rows.Add((new Object[] {"HAYD", "David", "Hayden"}));
return dt.CreateDataReader();
} | 
