HtmlTextArea.RenderAttributes(HtmlTextWriter) 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 HtmlTextArea 控制項的屬性轉譯為指定的 HtmlTextWriter 物件。
protected:
override void RenderAttributes(System::Web::UI::HtmlTextWriter ^ writer);protected override void RenderAttributes (System.Web.UI.HtmlTextWriter writer);override this.RenderAttributes : System.Web.UI.HtmlTextWriter -> unitProtected Overrides Sub RenderAttributes (writer As HtmlTextWriter)參數
- writer
- HtmlTextWriter
HtmlTextWriter 接收轉譯的內容。
範例
下列程式碼範例示範如何覆寫 RenderAttributes 自訂伺服器控制項中的 方法，讓控制項一律顯示 HtmlTextArea 特定的標題文字。
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<!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)
{
HtmlTextArea1.Value = "Hello HTML Text Area World.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom HtmlTextArea RenderAttributes Example</title>
</head>
<body>
<form id="Form1"
method="post"
runat="server">
<h3>Custom HtmlTextArea - RenderAttributes - C# Example</h3>
<aspSample:CustomHtmlTextAreaRenderAttributes
id="HtmlTextArea1"
name="HtmlTextArea1"
runat="server"
rows="4"
cols="50" />
</form>
</body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!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)
HtmlTextArea1.Value = "Hello HTML Text Area World."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom HtmlTextArea RenderAttributes Example</title>
</head>
<body>
<form id="Form1"
method="post"
runat="server">
<h3>Custom HtmlTextArea RenderAttributes Example</h3>
<aspSample:CustomHtmlTextAreaRenderAttributes
id="HtmlTextArea1"
name="HtmlTextArea1"
runat="server"
rows="4"
cols="50" />
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlTextAreaRenderAttributes : System.Web.UI.HtmlControls.HtmlTextArea
{
protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
{
// Write out the Title attribute.
writer.Write(" Title=\"Text from RenderAttributes.\"");
// Call the base class's RenderAttributes method.
base.RenderAttributes(writer);
}
}
}
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlTextAreaRenderAttributes
Inherits System.Web.UI.HtmlControls.HtmlTextArea
Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)
' Write out the Title attribute.
writer.Write(" Title=""Text from RenderAttributes.""")
' Call the base class's RenderAttributes method.
MyBase.RenderAttributes(writer)
End Sub
End Class
End Namespace
備註
方法 RenderAttributes 會 name 直接轉譯 控制項的 HtmlTextArea 屬性，以確保它的值與 屬性相同 Control.UniqueID 。 轉譯屬性之後，方法會 RenderAttributes 呼叫基類的 RenderAttributes 方法。
方法 RenderAttributes 主要是由控制項開發人員用來擴充控制項的功能 HtmlTextArea 。