TableCellCollection.GetEnumerator Method

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

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Returns a IEnumerator implemented object that contains all TableCell objects in the TableCellCollection.

public:
 virtual System::Collections::IEnumerator ^ GetEnumerator();

public System.Collections.IEnumerator GetEnumerator ();

abstract member GetEnumerator : unit -> System.Collections.IEnumerator
override this.GetEnumerator : unit -> System.Collections.IEnumerator

Public Function GetEnumerator () As IEnumerator

Returns

IEnumerator

A IEnumerator implemented object that contains all TableCell objects within the TableCellCollection.

Implements

GetEnumerator()

Examples

The following example demonstrates how to use the GetEnumerator method to create a System.Collections.IEnumerator implemented object. It is then iterated through to display the items in the selected row.

<%@ 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();

        // 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 rows.
            for (int rowNum = 0; rowNum < numrows; rowNum++)
            {
                a_row.Add(rowNum.ToString());
            }

            List1.DataSource = a_row;
            List1.DataBind();

        }
    }

    void Button_Click(object sender, EventArgs e)
    {

        int rowNum = List1.SelectedIndex;
        TableCell current_cell;

        // Create the IEnumerator.
        IEnumerator myEnum = Table1.Rows[rowNum].Cells.GetEnumerator();

        Label1.Text = "The items in the selected row are: ";

        // Iterate through the IEnumerator and display its contents.
        while (myEnum.MoveNext())
        {
            current_cell = (TableCell)myEnum.Current;
            Label1.Text = Label1.Text + " " + current_cell.Text;
        }
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" 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 />&nbjsp;<br />
    <p style="text-align:center">
        Select a row:
        <br />&nbjsp;<br />
        Row: <asp:DropDownList id="List1" 
            runat="server"/>

        <br />&nbjsp;<br />
        <asp:Button id="Button1"
             Text="Create IEnumerator"
             OnClick="Button_Click"
             runat="server" />
        <br />&nbjsp;<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()
        
        ' 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 rows.
            For rowNum = 0 To numRows - 1
                a_row.Add(rowNum.ToString())
            Next
            
            List1.DataSource = a_row
            List1.DataBind()
        End If
    End Sub

    Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)
        
        Dim row As Integer = List1.SelectedIndex
        Dim current_cell As TableCell
        
        ' Create the IEnumerator.
        Dim myEnum As IEnumerator = Table1.Rows(row).Cells.GetEnumerator()
        
        Label1.Text = "The items in the selected row are: "
        
        ' Iterate through the IEnumerator and display its contents.
        While myEnum.MoveNext()
            current_cell = CType(myEnum.Current, TableCell)
            Label1.Text = Label1.Text & " " & current_cell.Text
        End While
    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 />&nbjsp;<br />
    <p style="text-align:center">
        Select a row:
        <br />&nbjsp;<br />
        Row: <asp:DropDownList id="List1" 
            runat="server"/>

        <br />&nbjsp;<br />
        <asp:Button id="Button1"
             Text="Create IEnumerator"
             OnClick="Button_Click"
             runat="server" />
        <br />&nbjsp;<br />
        <asp:Label id="Label1" runat="server"/>
    </p>

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

Remarks

Use this method to create a System.Collections.IEnumerator implemented object that can be iterated through easily to get each item in the TableCellCollection.

Use the IEnumerator.Current property to get the item currently pointed to in the collection.

Use the IEnumerator.MoveNext method to move to the next item in the collection.

Use the IEnumerator.Reset method to move the enumerator back to the initial position.

Note

The IEnumerator.MoveNext method must be called after creating a System.Collections.IEnumerator implemented object or after using the IEnumerator.Reset method to move the enumerator to the first item in the collection. Otherwise, the item represented by the IEnumerator.Current property is undefined.

Applies to