ChtmlTextWriter.WriteBreak 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
將 br
項目寫入 cHTML 輸出資料流中。
public:
override void WriteBreak();
public override void WriteBreak ();
override this.WriteBreak : unit -> unit
Public Overrides Sub WriteBreak ()
範例
本節包含兩個程式碼範例。 第一個程式碼範例示範如何建立 cHTML 類別和自訂屬性。 第二個程式碼範例示範如何在網頁上使用自訂類別。
若要使用自訂 ChtmlSimplelabelAdapter
配接器,請將下列程式碼新增至.NET Framework組態瀏覽目錄器的子目錄中的適當全電腦檔案,或新增至 Web 應用程式根目錄下App_Browsers目錄中的自訂瀏覽器檔案。
<controlAdapters>
<adapter controlType="AspNet.Samples.SimpleLabel"
adapterType="AspNet.Samples.ChtmlSimpleLabelAdapter" />
</controlAdapters>
下列程式碼範例示範如何為名為 SimpleLabel
的類別建立名為 ChtmlSimpleLabelAdapter
的 cHTML 配接器類別。 它會建立自訂 Control
屬性,允許 ChtmlSimpleLabelAdapter
類別存取 類別的成員 SimpleLabel
,然後覆寫 Render 方法。 在覆寫中,會發生下列情況:
它會建立名為 的 物件參考 ChtmlTextWriter ,該物件衍生自 HtmlTextWriter 傳遞做為
writer
方法參數的物件 Render 。w
它會建立字串,並將它設定為等於
SimpleLabel.Text
值。它會呼叫 方法, EnterStyle 將標籤的 屬性所 ControlStyle 定義的樣式套用至 cHTML 輸出資料流程。
它會將
Text
屬性值寫入資料流程,並藉由呼叫 ExitStyle 方法來關閉樣式區塊。它會呼叫 方法, WriteBreak 在文字和樣式轉譯之後,將專案轉
br
譯至輸出資料流程。
// Create a custom CHTML Adapter for a
// SimpleLabel class.
public class ChtmlSimpleLabelAdapter : WebControlAdapter
{
// Create the Control property to access
// the properties and methods of the
// SimpleLabel class.
protected SimpleLabel Control
{
get
{
return (SimpleLabel)base.Control;
}
}
// Override the Render method to render text
// in CHTML with the style defined by the control
// and a <br> element after the text and styles
// have been written to the output stream.
protected override void Render(HtmlTextWriter writer)
{
ChtmlTextWriter w = new ChtmlTextWriter(writer);
string value = Control.Text;
// Render the text of the control using
// the control's style settings.
w.EnterStyle(Control.ControlStyle);
w.Write(value);
w.ExitStyle(Control.ControlStyle);
w.WriteBreak();
}
}
' Create a custom CHTML Adapter for a
' class, named SimpleLabel.
Public Class ChtmlSimpleLabelAdapter
Inherits WebControlAdapter
' Create the Control property to access
' the properties and methods of the
' SimpleLabel class.
Protected Shadows ReadOnly Property Control() As SimpleLabel
Get
Return CType(MyBase.Control, SimpleLabel)
End Get
End Property
' Override the Render method to render text
' in CHTML with the style defined by the control
' and a <br> element after the text and styles
' have been written to the output stream.
Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)
Dim w As ChtmlTextWriter = New ChtmlTextWriter(writer)
Dim value As String = Control.Text
' Render the text of the control using
' the control's style settings.
w.EnterStyle(Control.ControlStyle)
w.Write(value)
w.ExitStyle(Control.ControlStyle)
w.WriteBreak()
End Sub
End Class
下列範例示範如何在網頁中使用 SimpleLabel
類別。
<%@ Page Language="C#" %>
<%@ Import Namespace="AspNet.Samples" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
SimpleLabel sl = new SimpleLabel();
sl.ID = "SimpleLabel1";
sl.Text = "SimpleLabel Text";
PlaceHolder1.Controls.Add(sl);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>CHtmlTextWriter Example</title>
</head>
<body>
<form id="form1" runat="server" >
<div>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Import Namespace="AspNet.Samples" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Dim sl As SimpleLabel = New SimpleLabel()
sl.ID = "SimpleLabel1"
sl.Text = "SimpleLabel Text"
PlaceHolder1.Controls.Add(sl)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>CHtmlTextWriter Example</title>
</head>
<body>
<form id="form1" runat="server" >
<div>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</div>
</form>
</body>
</html>
備註
使用 方法, WriteBreak 將分行符號插入 cHTML 資料流程。