TableCellCollection.Item[Int32] Proprietà

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Ottiene un oggetto TableCell da TableCellCollection in corrispondenza dell'indice specificato.

public:
 property System::Web::UI::WebControls::TableCell ^ default[int] { System::Web::UI::WebControls::TableCell ^ get(int index); };
public System.Web.UI.WebControls.TableCell this[int index] { get; }
member this.Item(int) : System.Web.UI.WebControls.TableCell
Default Public ReadOnly Property Item(index As Integer) As TableCell

Parametri

index
Int32

Valore di indice ordinale che specifica l'oggetto TableCell da restituire.

Valore della proprietà

TableCell

Oggetto TableCell che rappresenta un elemento di TableCellCollection.

Esempio

Nell'esempio seguente viene illustrato come usare l'indicizzatore per ottenere un TableCell oggetto da un TableCellCollectionoggetto . Si noti che nell'esempio la Cells proprietà dell'oggetto TableRow è un'istanza della TableCellCollection classe.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    void Page_Load(Object sender, EventArgs e)
    {
        int numRows = 5;
        int numcells = 6;
        int counter = 1;
        ArrayList a_row = new ArrayList();
        ArrayList a_column = new ArrayList();

        // Create a table.
        for (int rowNum = 0; rowNum < numRows; rowNum++)
        {
            TableRow rw = new TableRow();
            for (int cellNum = 0; cellNum < numcells; cellNum++)
            {
                TableCell cel = new TableCell();
                cel.Text = counter.ToString();
                rw.Cells.Add(cel);
                counter++;
            }
            Table1.Rows.Add(rw);
        }

        if (!IsPostBack)
        {
            // Create a DropDownList for the number of columns.
            for (int cellNum = 0; cellNum < numcells; cellNum++)
            {
                a_column.Add(cellNum.ToString());
            }

            // Create a DropDownList for the number of rows.
            for (int rowNum = 0; rowNum < numRows; rowNum++)
            {
                a_row.Add(rowNum.ToString());
            }

            List1.DataSource = a_column;
            List2.DataSource = a_row;
            List1.DataBind();
            List2.DataBind();
        }
    }

    void Button_Click(object sender, EventArgs e)
    {
        int column = List1.SelectedIndex;
        int row = List2.SelectedIndex;

        string spec = "The cell ({0}, {1}) contains the value {2}.";
        Label1.Text = String.Format(spec, column,
            row, Table1.Rows[row].Cells[column].Text);
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>TableCellCollection Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <h3>TableCellCollection Example</h3>
    <asp:Table id="Table1" 
        runat="server"/>
    <br />&nbsp;<br />
    <p>Select a column and row:<br />
        Column: <asp:DropDownList id="List1" 
            runat="server"/>
        Row: <asp:DropDownList id="List2"
            runat="server"/>
        <br />&nbsp;<br />
        <asp:Button id="Button1"
            Text="Display Cell Value"
            OnClick="Button_Click"
            runat="server"/>
        <br />&nbsp;<br />
        <asp:Label id="Label1"
            runat="server"/>
    </p>

    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    
    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        Dim numRows As Integer = 5
        Dim numCells As Integer = 6
        Dim counter As Integer = 1
        Dim a_row As New ArrayList()
        Dim a_column As New ArrayList()

        ' Create a table.
        Dim rowNum As Integer
        For rowNum = 0 To numRows - 1
            Dim rw As New TableRow()
            Dim cellNum As Integer
            For cellNum = 0 To numCells - 1
                Dim cel As New TableCell()
                cel.Text = counter.ToString()
                rw.Cells.Add(cel)
                counter += 1
            Next
            Table1.Rows.Add(rw)
        Next

        If Not IsPostBack Then
            ' Create a DropDownList for the number of columns.
            Dim cellNum As Integer
            For cellNum = 0 To numCells - 1
                a_column.Add(cellNum.ToString())
            Next

            ' Create a DropDownList for the number of rows.
            For rowNum = 0 To numRows - 1
                a_row.Add(rowNum.ToString())
            Next

            List1.DataSource = a_column
            List2.DataSource = a_row
            List1.DataBind()
            List2.DataBind()
        End If
    End Sub

    Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)
        Dim column As Integer = List1.SelectedIndex
        Dim row As Integer = List2.SelectedIndex
        
        Dim spec As String
        spec = "The cell ({0}, {1}) contains the value {2}."
        Label1.Text = String.Format(spec, column, _
            row, Table1.Rows(row).Cells(column).Text)
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <h3>TableCellCollection Example</h3>
    <asp:Table id="Table1" 
        runat="server"/>
    <br />&nbsp;<br />
    <p>Select a column and row:<br />
        Column: <asp:DropDownList id="List1" 
            runat="server"/>
        Row: <asp:DropDownList id="List2"
            runat="server"/>
        <br />&nbsp;<br />
        <asp:Button id="Button1"
            Text="Display Cell Value"
            OnClick="Button_Click"
            runat="server"/>
        <br />&nbsp;<br />
        <asp:Label id="Label1"
            runat="server"/>
    </p>

    </div>
    </form>
</body>
</html>

Commenti

Usare questo indicizzatore per ottenere un individuo TableCell nell'indice TableCellCollection specificato usando la notazione di matrice semplice.

Si applica a

Vedi anche