HtmlSelect.RenderAttributes(HtmlTextWriter) 메서드
정의
중요
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HtmlSelect 컨트롤의 특성을 지정된 HtmlTextWriter 개체에 렌더링합니다.
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)매개 변수
- writer
- HtmlTextWriter
렌더링된 콘텐츠를 받는 HtmlTextWriter입니다.
예제
다음 코드 예제에서는 컨트롤에 대 한 특정 제목 텍스트가 항상 표시 되도록 사용자 지정 서버 컨트롤에서 메서드를 재정 RenderAttributes 의 HtmlSelect 하는 방법을 보여 줍니다.
<%@ 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom HtmlSelect - RenderAttributes - C# Example</title>
<script runat="server">
void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
{
if (HtmlSelect1.SelectedIndex >= 0)
{
if (HtmlSelect1.Multiple == true)
{
Div1.InnerHtml = "You selected:";
for (int i=0; i<=HtmlSelect1.Items.Count - 1; i++)
{
if (HtmlSelect1.Items[i].Selected == true)
{
Div1.InnerHtml += "<br /> " + HtmlSelect1.Items[i].Value;
}
}
}
else
{
Div1.InnerHtml = "You selected " + HtmlSelect1.Value;
}
}
else
{
Div1.InnerHtml = "You did not select an item.";
}
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlSelect - RenderAttributes - C# Example</h3>
<p>
<aspSample:CustomHtmlSelectRenderAttributes
id="HtmlSelect1"
name="HtmlSelect1"
runat="server">
<option value="Option1">Option1</option>
<option value="Option2">Option2</option>
<option value="Option3">Option3</option>
</aspSample:CustomHtmlSelectRenderAttributes>
</p>
<p>
<input
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Select"
name="HtmlInputButton1" />
</p>
<br />
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom HtmlSelect - RenderAttributes - VB.NET Example</title>
<script runat="server">
Sub HtmlInputButton1_ServerClick(sender As Object, e As EventArgs)
If HtmlSelect1.SelectedIndex >= 0 Then
If HtmlSelect1.Multiple = True Then
Div1.InnerHtml = "You selected:"
Dim i As Integer
For i = 0 To HtmlSelect1.Items.Count - 1
If HtmlSelect1.Items(i).Selected = True Then
Div1.InnerHtml += "<br /> " & HtmlSelect1.Items(i).Value
End If
Next i
Else
Div1.InnerHtml = "You selected " & HtmlSelect1.Value
End If
Else
Div1.InnerHtml = "You did not select an item."
End If
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlSelect - RenderAttributes - VB.NET Example</h3>
<p>
<aspSample:CustomHtmlSelectRenderAttributes
id="HtmlSelect1"
name="HtmlSelect1"
runat="server">
<option value="Option1">Option1</option>
<option value="Option2">Option2</option>
<option value="Option3">Option3</option>
</aspSample:CustomHtmlSelectRenderAttributes>
</p>
<p>
<input
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Select"
name="HtmlInputButton1" />
</p>
<br />
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlSelectRenderAttributes : System.Web.UI.HtmlControls.HtmlSelect
{
protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
{
// Write out Title tag
writer.Write(" Title=\"Text from RenderAttributes.\"");
// Call the base's RenderAttributes method.
base.RenderAttributes(writer);
}
}
}
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlSelectRenderAttributes
Inherits System.Web.UI.HtmlControls.HtmlSelect
Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)
' Write out Title tag
writer.Write(" Title=""Text from RenderAttributes.""")
' Call the base's RenderAttributes method.
MyBase.RenderAttributes(writer)
End Sub
End Class
설명
메서드는 RenderAttributes 컨트롤의 name HtmlSelect 특성을 직접 렌더링하여 속성과 동일한 값을 Control.UniqueID 갖도록 합니다. 특성을 렌더링한 후 메서드는 RenderAttributes 기본 클래스의 RenderAttributes 메서드를 호출합니다.
합니다 RenderAttributes 메서드는 주로 컨트롤 개발자가 기능을 확장 합니다 HtmlSelect 제어 합니다.