TableRowCollection.Item[Int32] Proprietà
Definizione
Importante
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Ottiene un TableRow oggetto dall'oggetto TableRowCollection in corrispondenza dell'indice specificato.
public:
property System::Web::UI::WebControls::TableRow ^ default[int] { System::Web::UI::WebControls::TableRow ^ get(int index); };public System.Web.UI.WebControls.TableRow this[int index] { get; }member this.Item(int) : System.Web.UI.WebControls.TableRowDefault Public ReadOnly Property Item(index As Integer) As TableRowParametri
- index
- Int32
Valore di indice ordinale che specifica l'oggetto TableRow da restituire. Questo indice è in base zero.
Valore della proprietà
Oggetto TableRow che rappresenta un elemento nell'oggetto TableRowCollection.
Esempio
Nell'esempio seguente viene illustrato come usare l'indicizzatore per ottenere un TableRow oggetto da un oggetto TableRowCollection. Si noti che nell'esempio la Rows proprietà di Table è un'istanza della TableRowCollection 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;
// 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();
if (cellNum == List2.SelectedIndex)
cel.BackColor = System.Drawing.Color.Chartreuse;
else if (rowNum == List1.SelectedIndex)
cel.BackColor = System.Drawing.Color.CadetBlue;
else
cel.BackColor = System.Drawing.Color.White;
rw.Cells.Add(cel);
counter++;
}
Table1.Rows.Add(rw);
}
if (!IsPostBack)
{
// Fill a DropDownList with row numbers
for (int rowNum = 0; rowNum < numRows; rowNum++)
{
List1.Items.Add(rowNum.ToString());
}
// Fill a DropDownList with column numbers
for (int cellNum = 0; cellNum < numCells; cellNum++)
{
List2.Items.Add(cellNum.ToString());
}
}
}
void Button_Click(object sender, EventArgs e)
{
int rowNum = List1.SelectedIndex;
TableRow rw = Table1.Rows[rowNum];
Label1.Text = "The row index of the selected cell is " +
Table1.Rows.GetRowIndex(rw).ToString();
}
</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 /> <br />
Select a cell:
<br /> <br />
Row: <asp:DropDownList id="List1" runat="server" />
Column: <asp:DropDownList id="List2" runat="server" />
<br /> <br />
<asp:Button id="Button1"
Text="Get Index"
OnClick="Button_Click"
runat="server" />
<br /> <br />
<asp:Label id="Label1" runat="server" />
</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 cellNum As Integer
Dim counter As Integer = 1
' Create a table.
Dim rowNum As Integer
For rowNum = 0 To numRows - 1
Dim rw As New TableRow()
For cellNum = 0 To numCells - 1
Dim cel As New TableCell()
cel.Text = counter.ToString()
If cellNum = List2.SelectedIndex Then
cel.BackColor = System.Drawing.Color.Chartreuse
ElseIf rowNum = List1.SelectedIndex Then
cel.BackColor = System.Drawing.Color.CadetBlue
Else
cel.BackColor = System.Drawing.Color.White
End If
rw.Cells.Add(cel)
counter += 1
Next cellNum
Table1.Rows.Add(rw)
Next rowNum
If Not IsPostBack Then
' Fill a DropDownList with row numbers
For rowNum = 0 To numRows - 1
List1.Items.Add(rowNum.ToString())
Next rowNum
' Fill a DropDownList with column numbers
For cellNum = 0 To numCells - 1
List2.Items.Add(cellNum.ToString())
Next cellNum
End If
End Sub
Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim rowNum As Integer = List1.SelectedIndex
Dim rw As TableRow = Table1.Rows(rowNum)
Label1.Text = "The row index of the selected cell is " & _
Table1.Rows.GetRowIndex(rw).ToString()
End Sub
</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 /> <br />
Select a cell:
<br /> <br />
Row: <asp:DropDownList id="List1" runat="server" />
Column: <asp:DropDownList id="List2" runat="server" />
<br /> <br />
<asp:Button id="Button1"
Text="Get Index"
OnClick="Button_Click"
runat="server" />
<br /> <br />
<asp:Label id="Label1" runat="server" />
</div>
</form>
</body>
</html>
Commenti
Usare questo indicizzatore per ottenere un singolo TableRow oggetto dall'oggetto TableRowCollection in corrispondenza dell'indice specificato usando la notazione di matrice semplice.
