How do you use SortExpression?

2 years ago
Noah Thompson
2 minutes

SortExpression is an attribute used to arrange data in either ascending or descending order.

Here is how to use:

  1. In a data source control (such as GridView, ListView, etc.) that requires sorting, locate the SortExpression property and set it to the name of the field you want to sort by. For example, if you want to sort by the “Name” field, you can set the SortExpression property to “Name”.
  2. Enable sorting function in the data source control by setting the AllowSorting property to true.
  3. Add a Sorting event handler to the data source control, which will be used to handle the sorting logic. In this event handler, you can retrieve the current sorting field using the e.SortExpression property and then proceed with the necessary data sorting operation.

Here is an example code:

<asp:GridView ID="GridView1" runat="server" AllowSorting="True" OnSorting="GridView1_Sorting">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
        ...
    </Columns>
</asp:GridView>

protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
    // 获取当前的排序字段
    string sortExpression = e.SortExpression;

    // 根据排序字段对数据进行排序操作

    // 重新绑定数据源
    GridView1.DataBind();
}

In the above example, by setting the SortExpression property to “Name”, clicking on the GridView column header will trigger the Sorting event. In the event handling method, the current sorting field can be accessed, and then the data can be sorted as needed. Finally, rebind the data source to achieve data sorting.

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