DataGrid.ItemDataBound イベント
アセンブリ: System.Web (system.web.dll 内)

Dim instance As DataGrid Dim handler As DataGridItemEventHandler AddHandler instance.ItemDataBound, handler
public: event DataGridItemEventHandler^ ItemDataBound { void add (DataGridItemEventHandler^ value); void remove (DataGridItemEventHandler^ value); }

ItemDataBound イベントは、項目が DataGrid コントロールにデータ連結された後に発生します。このイベントは、クライアント上にデータ項目が表示される前に、その項目にアクセスする最後の機会を提供します。このイベントが発生した後は、データ項目が null になり、使用できなくなります。

ItemDataBound イベントのハンドラを指定およびコーディングして、DataGrid の項目がデータ連結された順序を表示する方法を次の例に示します。
<%@ Page Language="VB" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script language="VB" runat="server"> Dim Cart As DataTable Dim CartView As DataView Function CreateDataSource() As ICollection Dim dt As New DataTable() Dim dr As DataRow dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32))) dt.Columns.Add(New DataColumn("StringValue", GetType(String))) dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double))) Dim i As Integer For i = 0 To 9 dr = dt.NewRow() dr(0) = i dr(1) = "Item " & i.ToString() dr(2) = 1.23 *(i + 1) dt.Rows.Add(dr) Next i Dim dv As New DataView(dt) Return dv End Function 'CreateDataSource Sub Page_Load(sender As Object, e As EventArgs) If Not IsPostBack Then ' Need to load this data only once. ItemsGrid.DataSource = CreateDataSource() ItemsGrid.DataBind() End If End Sub 'Page_Load Sub Item_Bound(sender As Object, e As DataGridItemEventArgs) Label1.Text = Label1.Text & " " & e.Item.ItemIndex End Sub 'Item_Bound </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" OnItemDataBound="Item_Bound" AutoGenerateColumns="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> <br> <asp:Label id="Label1" Text="Order of items data bound: " runat="server"/> <br> <asp:Label id="Label2" Text="Note: The -1's refer to the header and footer." runat="server"/> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script language="C#" runat="server"> DataTable Cart; DataView CartView; ICollection CreateDataSource() { DataTable dt = new DataTable(); DataRow dr; dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); dt.Columns.Add(new DataColumn("StringValue", typeof(string))); dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double))); for (int i = 0; i < 10; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = 1.23 * (i+1); dt.Rows.Add(dr); } DataView dv = new DataView(dt); return dv; } void Page_Load(Object sender, EventArgs e) { if (!IsPostBack) { // Need to load this data only once. ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } } void Item_Bound(Object sender, DataGridItemEventArgs e) { Label1.Text = Label1.Text + " " + e.Item.ItemIndex; } </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" OnItemDataBound="Item_Bound" AutoGenerateColumns="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> <br> <asp:Label id="Label1" Text="Order of items data bound: " runat="server"/> <br> <asp:Label id="Label2" Text="Note: The -1's refer to the header and footer." runat="server"/> </form> </body> </html>
<%@ Page Language="JScript" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script language="JScript" runat="server"> var Cart : DataTable; var CartView : DataView; function CreateDataSource() : ICollection { var dt : DataTable = new DataTable(); var dr : DataRow; dt.Columns.Add(new DataColumn("IntegerValue", Int32)); dt.Columns.Add(new DataColumn("StringValue", System.String)); dt.Columns.Add(new DataColumn("CurrencyValue", double)); for (var i : int = 0; i < 9; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = 1.23 * (i+1); dt.Rows.Add(dr); } var dv : DataView = new DataView(dt); return dv; } function Page_Load(sender, e : EventArgs) { if (!IsPostBack) { // Need to load this data only once. ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } } function Item_Bound(sender, e : DataGridItemEventArgs) { Label1.Text = Label1.Text + " " + e.Item.ItemIndex; } </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" OnItemDataBound="Item_Bound" AutoGenerateColumns="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> <br> <asp:Label id="Label1" Text="Order of items data bound: " runat="server"/> <br> <asp:Label id="Label2" Text="Note: The -1's refer to the header and footer." runat="server"/> </form> </body> </html>
<%@ Page Language="VB" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> Function CreateDataSource() As ICollection ' 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 10 dr = dt.NewRow() dr(0) = i dr(1) = "Item " & i.ToString() dr(2) = 1.23 * (i + 1) dt.Rows.Add(dr) Next i 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 Item_Bound(sender As Object, e As DataGridItemEventArgs) ' Use the ItemDataBound event to customize the DataGrid control. ' The ItemDataBound event allows you to access the data before ' the item is displayed in the control. In this example, the ' ItemDataBound event is used to format the items in the ' CurrencyColumn in currency format. If e.Item.ItemType = ListItemType.Item Or _ e.Item.ItemType = ListItemType.AlternatingItem Then ' Retrieve the text of the CurrencyColumn from the DataGridItem ' and convert the value to a Double. Dim Price As Double = Convert.ToDouble(e.Item.Cells(2).Text) ' Format the value as currency and redisplay it in the DataGrid. e.Item.Cells(2).Text = Price.ToString("c") End If End Sub </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" OnItemDataBound="Item_Bound"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" Debug="true" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> ICollection CreateDataSource() { // 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<=10; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = 1.23 * (i + 1); dt.Rows.Add(dr); } 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 Item_Bound(Object sender, DataGridItemEventArgs e) { // Use the ItemDataBound event to customize the DataGrid control. // The ItemDataBound event allows you to access the data before // the item is displayed in the control. In this example, the // ItemDataBound event is used to format the items in the // CurrencyColumn in currency format. if((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem)) { // Retrieve the text of the CurrencyColumn from the DataGridItem // and convert the value to a Double. Double Price = Convert.ToDouble(e.Item.Cells[2].Text); // Format the value as currency and redisplay it in the DataGrid. e.Item.Cells[2].Text = Price.ToString("c"); } } </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" OnItemDataBound="Item_Bound"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> </form> </body> </html>
<%@ Page Language="VB" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> Function CreateDataSource() As ICollection ' 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 10 dr = dt.NewRow() dr(0) = i dr(1) = "Item " & i.ToString() dr(2) = 1.23 * (i + 1) dt.Rows.Add(dr) Next i Dim dv As DataView = New DataView(dt) return dv End Function Sub Page_Load(sender As Object, e As EventArgs) ' Manually register the event-handling method for the ' ItemDataBound event of the DataGrid control. AddHandler ItemsGrid.ItemDataBound, AddressOf Item_Bound ' 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 Item_Bound(sender As Object, e As DataGridItemEventArgs) ' Use the ItemDataBound event to customize the DataGrid control. ' The ItemDataBound event allows you to access the data before ' the item is displayed in the control. In this example, the ' ItemDataBound event is used to format the items in the ' CurrencyColumn in currency format. If e.Item.ItemType = ListItemType.Item Or _ e.Item.ItemType = ListItemType.AlternatingItem Then ' Retrieve the text of the CurrencyColumn from the DataGridItem ' and convert the value to a Double. Dim Price As Double = Convert.ToDouble(e.Item.Cells(2).Text) ' Format the value as currency and redisplay it in the DataGrid. e.Item.Cells(2).Text = Price.ToString("c") End If End Sub </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> ICollection CreateDataSource() { // 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<=10; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = 1.23 * (i + 1); dt.Rows.Add(dr); } DataView dv = new DataView(dt); return dv; } void Page_Load(Object sender, EventArgs e) { // Manually register the event-handling method for the // ItemDataBound event of the DataGrid control. ItemsGrid.ItemDataBound += new DataGridItemEventHandler(this.Item_Bound); // Load sample data only once, when the page is first loaded. if (!IsPostBack) { ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } } void Item_Bound(Object sender, DataGridItemEventArgs e) { // Use the ItemDataBound event to customize the DataGrid control. // The ItemDataBound event allows you to access the data before // the item is displayed in the control. In this example, the // ItemDataBound event is used to format the items in the // CurrencyColumn in currency format. if((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem)) { // Retrieve the text of the CurrencyColumn from the DataGridItem // and convert the value to a Double. Double Price = Convert.ToDouble(e.Item.Cells[2].Text); // Format the value as currency and redisplay it in the DataGrid. e.Item.Cells[2].Text = Price.ToString("c"); } } </script> <body> <form runat=server> <h3>DataGrid ItemDataBound Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> </form> </body> </html>

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