ListSelectionMode 列挙体とは何？わかりやすく解説 Weblio辞書

<!-- This example demonstrates how to select
 multiple items from a DataList 
and add the selected items to a DataGrid. The
 example uses a For Each loop
 
to iterate through the ListItem objects in
 the ListItemCollection of ListBox1. -->

<br /><span space="preserve">...</span><br
 /><%@ Page language="VB" AutoEventWireup="true"%>
<%@ Import Namespace="System.Data"
 %>

<HTML>
    <HEAD>
        
        <SCRIPT runat="server">
            ' Global Variables.
            Private dv As DataView
            Private dt As New
 DataTable()

            Private Sub Page_Load(sender As
 Object, e As System.EventArgs)
                ' Set the number of rows displayed in the ListBox to
 be
                ' the number of items in the ListBoxCollection.
                ListBox1.Rows = ListBox1.Items.Count

                ' If the DataTable is already stored in the Web form's
 default
                ' HttpSessionState variable, then don't recreate the
 DataTable.
                If Session("data")
 Is Nothing Then
                    ' Add columns to the DataTable.
                    dt.Columns.Add(New DataColumn("Item"))
                    dt.Columns.Add(New DataColumn("Price"))
        
                    ' Store the DataTable in the Session variable so
 it can be 
                    ' accessed again later.
                    Session("data") = dt
                    
                    ' Use the table to create a DataView, because the
 DataGrid
                    ' can only bind to a data source that implements
 IEnumerable.
                    dv = New DataView(dt)
            
                    ' Set the DataView as the data source, and bind
 it to the DataGrid.
                    DataGrid1.DataSource = dv
                    DataGrid1.DataBind()
                End If
            End Sub

            Private Sub addButton_Click(sender
 As Object, e As System.EventArgs)
                ' Add the items selected in ListBox1 to DataGrid1.
                Dim item As ListItem
                For Each item In
 ListBox1.Items
                    If item.Selected Then
                        ' Add the item to the DataGrid.
                        ' First, get the DataTable from the Session
 variable.
                        dt = CType(Session("data"),
 DataTable)
            
                        If  Not (dt Is
 Nothing) Then
                            ' Create a new DataRow in the DataTable.
                            Dim dr As DataRow
                            dr = dt.NewRow()
                            ' Add the item to the new DataRow.
                            dr("Item") = item.Text
                            ' Add the item's value to the DataRow.
                            dr("Price") = item.Value
                            ' Add the DataRow to the DataTable.
                            dt.Rows.Add(dr)

                            ' Rebind the data to DataGrid1.
                            dv = new DataView(dt)
                            DataGrid1.DataSource = dv
                            DataGrid1.DataBind()
                        End If
                    End If
                Next item
            End Sub
        </SCRIPT>

    </HEAD>
    
    <BODY>
        <form runat="server">

            <h3> ListItemCollection Example </h3>

            <table cellpadding="6" border="0">
                <tr>
                    <td valign="top">
                        <asp:ListBox id="ListBox1"
 runat="server" SelectionMode="Multiple">
                            <asp:ListItem Value=".89">apples</asp:ListItem>
                            <asp:ListItem Value=".49">bananas</asp:ListItem>
                            <asp:ListItem Value="2.99">cherries</asp:ListItem>
                            <asp:ListItem Value="1.49">grapes</asp:ListItem>
                            <asp:ListItem Value="2.00">mangos</asp:ListItem>
                            <asp:ListItem Value="1.09">oranges</asp:ListItem>
                        </asp:ListBox>
                    </td>

                    <td valign="top">
                        <asp:Button id="addButton"
 runat="server" Text="Add -->"
                            Width="100px" OnClick="addButton_Click"></asp:Button>
                    </td>

                    <td valign="top">
                        <asp:DataGrid Runat="server"
 ID="DataGrid1" CellPadding="4">
                        </asp:DataGrid>
                    </td>
                </tr>
            </table>        
        </form>
    </body>
</HTML>

<!-- This example demonstrates how to select multiple items from a DataList and
 add the 
selected items to a DataGrid. The example uses a foreach loop
 to iterate through 
the ListItem objects in the ListItemCollection of ListBox1. -->

<br /><span space="preserve">...</span><br /><%@
 Page language="c#" AutoEventWireup="true"%>
<%@ Import Namespace="System.Data" %>

<HTML>
    <HEAD>
        
        <SCRIPT language="C#" runat="server">
            // Global Variables.
            private DataView dv;
            private DataTable dt = new DataTable();

            private void Page_Load(object sender,
 System.EventArgs e)
            {
                // Set the number of rows displayed in the ListBox to
 be
                // the number of items in the ListBoxCollection.
                ListBox1.Rows = ListBox1.Items.Count;

                // If the DataTable is already stored in the Web form's
 default
                // HttpSessionState variable, then don't recreate the
 DataTable.
                if (Session["data"] == null)
                {
                    // Add columns to the DataTable.
                    dt.Columns.Add(new DataColumn("Item"));
                    dt.Columns.Add(new DataColumn("Price"));
        
                    // Store the DataTable in the Session variable so
 it can 
                    // be accessed again later.
                    Session["data"] = dt;
                    
                    // Use the table to create a DataView, because the
 DataGrid
                    // can only bind to a data source that implements
 IEnumerable.
                    dv = new DataView(dt);
            
                    // Set the DataView as the data source, and bind
 it to the DataGrid.
                    DataGrid1.DataSource = dv;
                    DataGrid1.DataBind();
                }
            }

            private void addButton_Click(object
 sender, System.EventArgs e)
            {
                // Add the items selected in ListBox1 to DataGrid1.
                foreach (ListItem item in ListBox1.Items)
                {
                    if (item.Selected)
                    {
                        // Add the item to the DataGrid.
                        // First, get the DataTable from the Session
 variable.
                        dt = (DataTable)Session["data"];
            
                        if (dt != null)
                        { 
                            // Create a new DataRow in the DataTable.
                            DataRow dr = dt.NewRow();
                            // Add the item to the new DataRow.
                            dr["Item"] = item.Text;
                            // Add the item's value to the DataRow.
                            dr["Price"] = item.Value;
                            // Add the DataRow to the DataTable.
                            dt.Rows.Add(dr);

                            // Rebind the data to DataGrid1.
                            dv = new DataView(dt);
                            DataGrid1.DataSource = dv;
                            DataGrid1.DataBind();
                        }
                    }
                }
            }
        </SCRIPT>

    </HEAD>
    
    <BODY>
        <form runat="server">

            <h3> ListItemCollection Example </h3>

            <table cellpadding="6" border="0">
                <tr>
                    <td valign="top">
                        <asp:ListBox id="ListBox1" runat="server"
 SelectionMode="Multiple">
                            <asp:ListItem Value=".89">apples</asp:ListItem>
                            <asp:ListItem Value=".49">bananas</asp:ListItem>
                            <asp:ListItem Value="2.99">cherries</asp:ListItem>
                            <asp:ListItem Value="1.49">grapes</asp:ListItem>
                            <asp:ListItem Value="2.00">mangos</asp:ListItem>
                            <asp:ListItem Value="1.09">oranges</asp:ListItem>
                        </asp:ListBox>
                    </td>

                    <td valign="top">
                        <asp:Button id="addButton" runat="server"
 Text="Add -->"
                            Width="100px" OnClick="addButton_Click"></asp:Button>
                    </td>

                    <td valign="top">
                        <asp:DataGrid Runat="server" ID="DataGrid1"
 CellPadding="4">
                        </asp:DataGrid>
                    </td>
                </tr>
            </table>        
        </form>
    </body>
</HTML>