/// <summary>
/// 动态生成LINQ查询，并将数据填入DataGridView控件中.
/// </summary>
private void btnSearch_Click(object sender, EventArgs e)
{
// 从控件中获取条件.
var c = ConditionBuilder1.GetCondition <Order>();
// 筛选掉不符合条件的所有Orders.
// 注意，由于延迟执行，实际上尚未执行查询.
var filteredQuery = db.Orders.Where(c);
// 我们现在可以执行其他任何操作（例如Order By或者Select)在filteredQuery中.
var query = from row in filteredQuery
orderby row.OrderDate, row.OrderID
select row;
// 执行查询，并将结果显示在DataGridView控件中.
dgResult.DataSource = query;
}
/// <summary>
/// Dynamically generate LINQ query and put it into DataGridView Control
/// </summary>
private void btnSearch_Click(object sender, EventArgs e)
{
// Get the Condition out of the control
var c = ConditionBuilder1.GetCondition <Order>();
// Filter out all Orders that don't match the Condition
// Note that the query does not actually get executed yet to due to deferred execution
var filteredQuery = db.Orders.Where(c);
// We can now perform any other operations (such as Order By or Select) on filteredQuery
var query = from row in filteredQuery
orderby row.OrderDate, row.OrderID
select row;
// Executes the query and displays the results in DataGridView1
dgResult.DataSource = query;
}