DataGrid.Items プロパティ
アセンブリ: System.Web (system.web.dll 内)

DataGrid コントロールの個別の項目を表す DataGridItem オブジェクトのコレクションを格納している DataGridItemCollection。

Items コレクションを使用して、DataGrid コントロールの項目をプログラムによって制御します。Items コレクションには、コレクションに項目を追加または削除するメソッドは用意されていません。ただし、ItemCreated イベントのハンドラを作成することによって、項目の内容を制御できます。
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データ ソースに連結された項目だけが、Items コレクションに格納されます。ヘッダー、フッター、および区切り記号は、コレクションに含まれません。 |

Items コレクションを使用して、DataGrid コントロールの各項目の内容を表示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 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 Button_Click(sender As Object, e As EventArgs) Dim item As DataGridItem For Each item In ItemsGrid.Items Label1.Text &= "<br>" & item.Cells(0).Text & _ " " & item.Cells(1).Text & _ " " & item.Cells(2).Text Next item End Sub 'Button_Click </script> <body> <form runat=server> <h3>DataGrid Items Collection Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" AutoGenerateColumns="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> <br> <asp:Button id="Button1" Text="Display Contents of Items Collection" OnClick="Button_Click" runat="server"/> <br> <asp:Label id="Label1" 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 Button_Click(Object sender, EventArgs e) { foreach (DataGridItem item in ItemsGrid.Items) { Label1.Text += "<br>" + item.Cells[0].Text + " " + item.Cells[1].Text + " " + item.Cells[2].Text; } } </script> <body> <form runat=server> <h3>DataGrid Items Collection Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" AutoGenerateColumns="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> <br> <asp:Button id="Button1" Text="Display Contents of Items Collection" OnClick="Button_Click" runat="server"/> <br> <asp:Label id="Label1" 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 Button_Click(sender, e : EventArgs) { for (var item : DataGridItem in ItemsGrid.Items) { Label1.Text += "<br>" + item.Cells[0].Text + " " + item.Cells[1].Text + " " + item.Cells[2].Text; } } </script> <body> <form runat=server> <h3>DataGrid Items Collection Example</h3> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="true" AutoGenerateColumns="true"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> </asp:DataGrid> <br> <asp:Button id="Button1" Text="Display Contents of Items Collection" OnClick="Button_Click" runat="server"/> <br> <asp:Label id="Label1" 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 4 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 Button_Click(sender As Object, e As EventArgs) ' Count the number of selected items in the DataGrid control. Dim count As Integer = 0 ' Display the selected times. Message.Text = "You Selected: <br>" ' Iterate through each item (row) in the DataGrid control and ' determine whether it is selected. Dim item As DataGridItem For Each item In ItemsGrid.Items DetermineSelection(item, count) Next ' If no items are selected, display the appropriate message. If count = 0 Then Message.Text = "No items selected" End If End Sub Sub DetermineSelection(item As DataGridItem, ByRef count As Integer) ' Retrieve the SelectCheckBox CheckBox control from the ' specified item (row) in the DataGrid control. Dim selection As CheckBox = _ CType(item.FindControl("SelectCheckBox"), CheckBox) ' If the item is selected, display the appropriate message and ' increment the count of selected items. If Not selection Is Nothing Then If selection.Checked Then Message.Text &= "- " & item.Cells(1).Text & "<br>" count = count + 1 End If End If End Sub Sub Check_Change(sender As Object, e As EventArgs) ' Show or hide the first column depending on the value of ' the check box. If ShowCheckBox.Checked Then ItemsGrid.Columns(0).Visible = True Else ItemsGrid.Columns(0).Visible = False End If End Sub </script> <body> <form runat=server> <h3>DataGridColumn Visible Example</h3> Select whether to show or hide the first column. <br><br> <b>Product List</b> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="True" AutoGenerateColumns="False" runat="server"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> <Columns> <asp:BoundColumn DataField="IntegerValue" Visible="True" HeaderText="Item"/> <asp:BoundColumn DataField="StringValue" Visible="True" HeaderText="Description"/> <asp:BoundColumn DataField="CurrencyValue" Visible="True" HeaderText="Price" DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="Right"> </ItemStyle> </asp:BoundColumn> <asp:TemplateColumn HeaderText="Select Item" Visible="True" > <ItemTemplate> <asp:CheckBox id="SelectCheckBox" Text="Add to Cart" Checked="False" runat="server"/> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid> <br><br> <asp:Button id="SubmitButton" Text="Submit" OnClick = "Button_Click" runat="server"/> <br><br> <asp:Label id="Message" runat="server"/> <hr> <asp:CheckBox id="ShowCheckBox" Text="Show first column" AutoPostBack="True" OnCheckedChanged="Check_Change" Checked="True" runat="server"/> </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 < 5; 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 Button_Click(Object sender, EventArgs e) { // Count the number of selected items in the DataGrid control. int count = 0; // Display the selected times. Message.Text = "You Selected: <br>"; // Iterate through each item (row) in the DataGrid control and // determine whether it is selected. foreach (DataGridItem item in ItemsGrid.Items) { DetermineSelection(item, ref count); } // If no items are selected, display the appropriate message. if (count == 0) { Message.Text = "No items selected"; } } void DetermineSelection(DataGridItem item, ref int count) { // Retrieve the SelectCheckBox CheckBox control from the // specified item (row) in the DataGrid control. CheckBox selection = (CheckBox)item.FindControl("SelectCheckBox"); // If the item is selected, display the appropriate message and // increment the count of selected items. if (selection != null) { if (selection.Checked) { Message.Text += "- " + item.Cells[1].Text + "<br>"; count++; } } } void Check_Change(Object sender, EventArgs e) { // Show or hide the first column depending on the value of // the check box. if (ShowCheckBox.Checked) { ItemsGrid.Columns[0].Visible = true; } else { ItemsGrid.Columns[0].Visible = false; } } </script> <body> <form runat=server> <h3>DataGridColumn Visible Example</h3> Select whether to show or hide the first column. <br><br> <b>Product List</b> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="True" AutoGenerateColumns="False" runat="server"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> <Columns> <asp:BoundColumn DataField="IntegerValue" Visible="True" HeaderText="Item"/> <asp:BoundColumn DataField="StringValue" Visible="True" HeaderText="Description"/> <asp:BoundColumn DataField="CurrencyValue" Visible="True" HeaderText="Price" DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="Right"> </ItemStyle> </asp:BoundColumn> <asp:TemplateColumn HeaderText="Select Item" Visible="True" > <ItemTemplate> <asp:CheckBox id="SelectCheckBox" Text="Add to Cart" Checked="False" runat="server"/> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid> <br><br> <asp:Button id="SubmitButton" Text="Submit" OnClick = "Button_Click" runat="server"/> <br><br> <asp:Label id="Message" runat="server"/> <hr> <asp:CheckBox id="ShowCheckBox" Text="Show first column" AutoPostBack="True" OnCheckedChanged="Check_Change" Checked="True" runat="server"/> </form> </body> </html>

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