DataGridSortCommandEventArgs.SortExpression プロパティ
DataGrid コントロールの並べ替えに使用される式を取得します。
名前空間: System.Web.UI.WebControls
アセンブリ: System.Web (system.web.dll 内)
構文
解説
使用例
プラットフォーム
バージョン情報
参照
アセンブリ: System.Web (system.web.dll 内)
構文
プロパティ値
DataGrid コントロールの並べ替えに使用される式。
DataGrid コントロールの並べ替えに使用される式。
解説使用例SortExpression プロパティを使用して、DataGrid コントロールの並べ替えのためにユーザーが選択した列を確認する方法を次のコード例に示します。
<%@ Page Language="VB" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> Function CreateDataSource() As ICollection ' Create a Random object to mix up the order of items in the ' sample data. Dim Rand_Num As Random = New Random() ' Create sample data for the DataGrid control. Dim dt As DataTable = New DataTable() Dim dr As DataRow ' Define the columns of the table. dt.Columns.Add(new DataColumn("IntegerValue", GetType(Int32))) dt.Columns.Add(new DataColumn("StringValue", GetType(String))) dt.Columns.Add(new DataColumn("CurrencyValue", GetType(Double))) ' Populate the table with sample values. Dim i As Integer For i = 0 To 8 dr = dt.NewRow() dr(0) = i dr(1) = "Item " & Rand_Num.Next(1, 15).ToString() dr(2) = 1.23 * Rand_Num.Next(1, 15) dt.Rows.Add(dr) Next i ' To persist the data source between posts to the server, ' store it in session state. Session("Source") = dt Dim dv As DataView = New DataView(dt) Return dv End Function Sub Page_Load(sender As Object, e As EventArgs) ' Load sample data only once, when the page is first loaded. If Not IsPostBack Then ItemsGrid.DataSource = CreateDataSource() ItemsGrid.DataBind() End If End Sub Sub Sort_Grid(sender As Object, e As DataGridSortCommandEventArgs) ' Retrieve the data source from session state. Dim dt As DataTable = CType(Session("Source"), DataTable) ' Create a DataView from the DataTable. Dim dv As DataView = New DataView(dt) ' The DataView provides an easy way to sort. Simply set the ' Sort property with the name of the field to sort by. dv.Sort = e.SortExpression ' Rebind the data source and specify that it should be sorted ' by the field specified in the SortExpression property. ItemsGrid.DataSource = dv ItemsGrid.DataBind() End Sub Sub Check_Change(sender As Object, e As EventArgs) ' Allow or prevent sorting depending on the user's selection. If AllowSortingCheckBox.Checked Then ItemsGrid.AllowSorting = True Else ItemsGrid.AllowSorting = False End If ' After changing the property, rebind the data to ' refresh the DataGrid control. ' Retrieve the data source from session state. Dim dt As DataTable = CType(Session("Source"), DataTable) ' Create a DataView from the DataTable. Dim dv As DataView = New DataView(dt) ' Rebind the data source. ItemsGrid.DataSource = dv ItemsGrid.DataBind() End Sub </script> <body> <form runat=server> <h3>DataGrid AllowSorting Example</h3> Select whether to allow sorting in the DataGrid control. <br><br> <b>Product List</b> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" OnSortCommand="Sort_Grid" AutoGenerateColumns="False" AllowSorting="True" runat="server"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <Columns> <asp:BoundColumn DataField="IntegerValue" SortExpression="IntegerValue" HeaderText="Item"/> <asp:BoundColumn DataField="StringValue" SortExpression="StringValue" HeaderText="Description"/> <asp:BoundColumn DataField="CurrencyValue" HeaderText="Price" SortExpression="CurrencyValue" DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="Right"> </ItemStyle> </asp:BoundColumn> </Columns> </asp:DataGrid> <hr> <asp:CheckBox id="AllowSortingCheckBox" Text="Allow sorting" AutoPostBack="True" Checked="True" OnCheckedChanged="Check_Change" runat="server"/> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> ICollection CreateDataSource() { // Create a Random object to mix up the order of items in the // sample data. Random Rand_Num = new Random(); // Create sample data for the DataGrid control. DataTable dt = new DataTable(); DataRow dr; // Define the columns of the table. dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); dt.Columns.Add(new DataColumn("StringValue", typeof(String))); dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double))); // Populate the table with sample values. for (int i=0; i<=8; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + Rand_Num.Next(1, 15).ToString(); dr[2] = 1.23 * Rand_Num.Next(1, 15); dt.Rows.Add(dr); } // To persist the data source between posts to the server, // store it in session state. Session["Source"] = dt; DataView dv = new DataView(dt); return dv; } void Page_Load(Object sender, EventArgs e) { // Load sample data only once, when the page is first loaded. if (!IsPostBack) { ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } } void Sort_Grid(Object sender, DataGridSortCommandEventArgs e) { // Retrieve the data source from session state. DataTable dt = (DataTable)Session["Source"]; // Create a DataView from the DataTable. DataView dv = new DataView(dt); // The DataView provides an easy way to sort. Simply set the // Sort property with the name of the field to sort by. dv.Sort = e.SortExpression; // Rebind the data source and specify that it should be sorted // by the field specified in the SortExpression property. ItemsGrid.DataSource = dv; ItemsGrid.DataBind(); } void Check_Change(Object sender, EventArgs e) { // Allow or prevent sorting depending on the user's selection. if (AllowSortingCheckBox.Checked) { ItemsGrid.AllowSorting = true; } else { ItemsGrid.AllowSorting = false; } // After changing the property, rebind the data to // refresh the DataGrid control. // Retrieve the data source from session state. DataTable dt = (DataTable)Session["Source"]; // Create a DataView from the DataTable. DataView dv = new DataView(dt); // Rebind the data source. ItemsGrid.DataSource = dv; ItemsGrid.DataBind(); } </script> <body> <form runat=server> <h3>DataGrid AllowSorting Example</h3> Select whether to allow sorting in the DataGrid control. <br><br> <b>Product List</b> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" OnSortCommand="Sort_Grid" AutoGenerateColumns="False" AllowSorting="True" runat="server"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <Columns> <asp:BoundColumn DataField="IntegerValue" SortExpression="IntegerValue" HeaderText="Item"/> <asp:BoundColumn DataField="StringValue" SortExpression="StringValue" HeaderText="Description"/> <asp:BoundColumn DataField="CurrencyValue" HeaderText="Price" SortExpression="CurrencyValue" DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="Right"> </ItemStyle> </asp:BoundColumn> </Columns> </asp:DataGrid> <hr> <asp:CheckBox id="AllowSortingCheckBox" Text="Allow sorting" AutoPostBack="True" Checked="True" OnCheckedChanged="Check_Change" runat="server"/> </form> </body> </html>
プラットフォームWindows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
バージョン情報参照- DataGridSortCommandEventArgs.SortExpression プロパティのページへのリンク
