按日期降序排序

Question

我希望默认情况下在Gridview中以降序显示日期。

DataTable dt = new DataTable();
SqlDataAdapter adp = 
   new SqlDataAdapter("SELECT Customer.CustomerID, Customer.lastname, Customer.firstname, 
                              Ticket.Date, Ticket.Store, Ticket.Amount, Ticket.NoStub " +
                      "FROM Customer INNER JOIN Ticket ON Customer.CustomerID = Ticket.CustomerID 
                       WHERE Customer.CustomerID like " + txtCustomerID.Text, cn);
adp.Fill(dt);
gvHistory.DataSource = dt;

Answer 1

只需添加：

 order by Ticket.Date desc

到你的sql语句的末尾，如下所示：

DataTable dt = new DataTable();
        SqlDataAdapter adp = new SqlDataAdapter("SELECT Customer.CustomerID,             Customer.lastname, Customer.firstname, Ticket.Date, Ticket.Store, Ticket.Amount, Ticket.NoStub " +
                                                "FROM Customer INNER JOIN Ticket ON Customer.CustomerID = Ticket.CustomerID WHERE Customer.CustomerID like " + txtCustomerID.Text + " order by Ticket.Date desc", cn);
        adp.Fill(dt);
        gvHistory.DataSource = dt;

Answer 2

正如@Adels的回答，你可以通过改变你的sql语句来订购，如果你想通过代码来做。 尝试DataGridView.Sort方法如下

gvHistory.Sort(gvHistory.Columns["ColumnName"], ListSortDirection.Descending);

Answer 3

1. 我建议在数据网格上使用Sort函数，就像Damith推荐的那样
2. 不要直接将用户参数放入SQL语句中 。 您必须使用WHERE Customer.CustomerID like @customerId ，然后在命令中添加一个参数，其中name = @customerId and value = txtCustomerID.Text 。 这1）防止用户输入破坏数据库，2）防止膨胀SQL计划缓存。

Answer 4

System.Data.DataTable dt = new System.Data.DataTable();
System.Data.SqlClient.SqlDataAdapter adp = new System.Data.SqlClient.SqlDataAdapter(
                      "SELECT Customer.CustomerID,
                              Customer.lastname, 
                              Customer.firstname, 
                              Ticket.Date, 
                              Ticket.Store, 
                              Ticket.Amount,
                              Ticket.NoStub " +
                      "FROM Customer INNER JOIN Ticket ON 
                              Customer.CustomerID = Ticket.CustomerID WHERE         
                              Customer.CustomerID like " + txtCustomerID.Text + " 
                              order by Ticket.Date desc", cn);
adp.Fill(dt);
gvHistory.DataSource = dt;