TableHeaderCell 类
表示 Table 控件中的标题单元格。
**命名空间:**System.Web.UI.WebControls
**程序集:**System.Web（在 system.web.dll 中）
语法
声明
Public Class TableHeaderCell
Inherits TableCell
用法
Dim instance As TableHeaderCell
public class TableHeaderCell : TableCell
public ref class TableHeaderCell : public TableCell
public class TableHeaderCell extends TableCell
public class TableHeaderCell extends TableCell
备注
TableHeaderCell 类表示 Table 控件中的标题单元格。可以使用 Text 属性指定或确定标题单元格的内容。
此类允许控制标题单元格内容的显示方式。通过设置 HorizontalAlign 和 VerticalAlign 属性来指定标题单元格内容的对齐方式。可以使用 Wrap 属性指定标题单元格的内容是否在单元格内换行。
也可以指定在 Table 控件中一个标题单元格所占的行数或列数。RowSpan 和 ColumnSpan 属性分别控制使用的行数和列数。
示例
下面的示例演示如何以声明方式对 TableHeaderCell 控件进行编程。
<%@ Page language="VB" AutoEventWireup="true" %>
<%@ Import Namespace="System.Drawing" %>
<html>
<head>
<script runat="server">
Private Sub Page_Load(sender As Object, e As System.EventArgs)
' Create a TableItemStyle object that can be
' set as the default style for all cells
' in the table.
Dim tableStyle As New TableItemStyle()
tableStyle.HorizontalAlign = HorizontalAlign.Center
tableStyle.VerticalAlign = VerticalAlign.Middle
tableStyle.Width = Unit.Pixel(100)
' Create more rows for the table.
Dim i As Integer
For i = 2 To 9
Dim tempRow As New TableRow()
Dim j As Integer
For j = 0 To 2
Dim tempCell As New TableCell()
tempCell.Text = "(" & i & "," & j & ")"
tempRow.Cells.Add(tempCell)
Next j
Table1.Rows.Add(tempRow)
Next i
' Apply the TableItemStyle to all rows in the table.
Dim r As TableRow
For Each r In Table1.Rows
Dim c As TableCell
For Each c In r.Cells
c.ApplyStyle(tableStyle)
Next c
Next r
' Create a header for the table.
Dim header As New TableHeaderCell()
header.RowSpan = 1
header.ColumnSpan = 3
header.Text = "Table of (x,y) Values"
header.Font.Bold = true
header.BackColor = Color.Gray
header.HorizontalAlign = HorizontalAlign.Center
header.VerticalAlign = VerticalAlign.Middle
' Add the header to a new row.
Dim headerRow As New TableRow()
headerRow.Cells.Add(header)
' Add the header row to the table.
Table1.Rows.AddAt(0, headerRow)
End Sub
</script>
</head>
<body>
<form runat="server">
<h1>TableCell Example</h1>
<asp:table id="Table1" runat="server" CellPadding="3" CellSpacing="3">
<asp:TableRow>
<asp:TableCell Text="(0,0)"></asp:TableCell>
<asp:TableCell Text="(0,1)"></asp:TableCell>
<asp:TableCell Text="(0,2)"></asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell Text="(1,0)"></asp:TableCell>
<asp:TableCell Text="(1,1)"></asp:TableCell>
<asp:TableCell Text="(1,2)"></asp:TableCell>
</asp:TableRow>
</asp:table>
</form>
</body>
</html>
<%@ Page language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Drawing" %>
<html>
<head>
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
// Create a TableItemStyle object that can be
// set as the default style for all cells
// in the table.
TableItemStyle tableStyle = new TableItemStyle();
tableStyle.HorizontalAlign = HorizontalAlign.Center;
tableStyle.VerticalAlign = VerticalAlign.Middle;
tableStyle.Width = Unit.Pixel(100);
// Create more rows for the table.
for (int i = 2; i < 10; i++)
{
TableRow tempRow = new TableRow();
for (int j = 0; j < 3; j++)
{
TableCell tempCell = new TableCell();
tempCell.Text = "(" + i + "," + j + ")";
tempRow.Cells.Add(tempCell);
}
Table1.Rows.Add(tempRow);
}
// Apply the TableItemStyle to all rows in the table.
foreach (TableRow r in Table1.Rows)
foreach (TableCell c in r.Cells)
c.ApplyStyle(tableStyle);
// Create a header for the table.
TableHeaderCell header = new TableHeaderCell();
header.RowSpan = 1;
header.ColumnSpan = 3;
header.Text = "Table of (x,y) Values";
header.Font.Bold = true;
header.BackColor = Color.Gray;
header.HorizontalAlign = HorizontalAlign.Center;
header.VerticalAlign = VerticalAlign.Middle;
// Add the header to a new row.
TableRow headerRow = new TableRow();
headerRow.Cells.Add(header);
// Add the header row to the table.
Table1.Rows.AddAt(0, headerRow);
}
</script>
</head>
<body>
<form runat="server">
<h1>TableCell Example</h1>
<asp:table id="Table1" runat="server" CellPadding="3" CellSpacing="3">
<asp:TableRow>
<asp:TableCell Text="(0,0)"></asp:TableCell>
<asp:TableCell Text="(0,1)"></asp:TableCell>
<asp:TableCell Text="(0,2)"></asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell Text="(1,0)"></asp:TableCell>
<asp:TableCell Text="(1,1)"></asp:TableCell>
<asp:TableCell Text="(1,2)"></asp:TableCell>
</asp:TableRow>
</asp:table>
</form>
</body>
</html>
继承层次结构
System.Object
System.Web.UI.Control
System.Web.UI.WebControls.WebControl
System.Web.UI.WebControls.TableCell
System.Web.UI.WebControls.TableHeaderCell
线程安全
此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
TableHeaderCell 成员
System.Web.UI.WebControls 命名空间
Table 类
TableCell 类
TableCell.Text 属性
TableCell.HorizontalAlign 属性
TableCell.VerticalAlign 属性
TableCell.Wrap 属性
TableCell.RowSpan 属性
TableCell.ColumnSpan 属性