HtmlInputFile.OnPreRender メソッド
アセンブリ: System.Web (system.web.dll 内)

Dim e As EventArgs Me.OnPreRender(e)


OnPreRender メソッドをオーバーライドして、それぞれのカスタムの HtmlInputFile コントロールに常に Title 属性が追加されるようにする方法を次のコード例に示します。この例を正常に動作させるには、コンピュータの C: ドライブに Temp というディレクトリを作成する必要があります。
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %> <%@ Page Language="VB" AutoEventWireup="True" %> <script runat="server"> Sub Button1_Click(ByVal source As Object, ByVal e As EventArgs) ' Make sure the file was submitted. If HtmlInputText1.Value = "" Then Span1.InnerHtml = "Error: You must enter a file name." ' Save the file ElseIf Not (HtmlInputFile1.PostedFile Is Nothing) Then Try HtmlInputFile1.PostedFile.SaveAs("c:\\temp\\" & HtmlInputText1.Value) Span1.InnerHtml = "File uploaded successfully to: <b>c:\temp\" _ & HtmlInputText1.Value & "</b> on the Web server." Catch exc As Exception Span1.InnerHtml = "Error saving <b>c:\temp\" _ & HtmlInputText1.Value & "</b><br>" _ & exc.ToString() & "." End Try End If End Sub </script> <html> <head> <title>Custom HtmlInputFile OnPreRender Example</title> </head> <body> <form enctype="multipart/form-data" runat="server"> <h3>Custom HtmlInputFile OnPreRender Example</h3> Select File to Upload: <aspSample:CustomHtmlInputFileOnPreRender id="HtmlInputFile1" type="file" runat="server" name="HtmlInputFile1"> <p> Save as file name (no path): <input id="HtmlInputText1" type="text" runat="server" name="Text1"> </p> <p> <span id="Span1" style="font: 8pt verdana;" runat="server" /> </p> <p> <input type="button" id="Button1" value="Upload" onserverclick="Button1_Click" runat="server" name="Button1"> </p> </form> </body> </html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %> <%@ Page Language="C#" AutoEventWireup="True" %> <script runat="server"> void Button1_Click(object Source, EventArgs e) { // Make sure a file was submitted. if (HtmlInputText1.Value == "") { Span1.InnerHtml = "Error: You must enter a file name."; } // Save the file. else if (HtmlInputFile1.PostedFile != null) { try { HtmlInputFile1.PostedFile.SaveAs("c:\\temp\\" + HtmlInputText1.Value); Span1.InnerHtml = "File uploaded successfully to: <b>c:\\temp\\" + HtmlInputText1.Value + "</b> on the Web server."; } catch (Exception exc) { Span1.InnerHtml = "Error saving <b>c:\\temp\\" + HtmlInputText1.Value + "</b><br>" + exc.ToString() + "."; } } } </script> <html> <head> <title>Custom HtmlInputFile OnPreRender Example</title> </head> <body> <form enctype="multipart/form-data" runat="server"> <h3>Custom HtmlInputFile OnPreRender Example</h3> Select File to Upload: <aspSample:CustomHtmlInputFileOnPreRender id="HtmlInputFile1" type="file" runat="server" name="HtmlInputFile1"> <p> Save as file name (no path): <input id="HtmlInputText1" type="text" runat="server" name="Text1"> </p> <p> <span id="Span1" style="font: 8pt verdana;" runat="server" /> </p> <p> <input type="button" id="Button1" value="Upload" onserverclick="Button1_Click" runat="server" name="Button1"> </p> </form> </body> </html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %> <%@ Page Language="VJ#" AutoEventWireup="True" %> <HTML> <HEAD> <title>Custom HtmlInputFile - OnPreRender - VJ# Example</title> <script runat=server> void Button1_Click(Object source, EventArgs e) { if (HtmlInputText1.get_Value().Equals("")) { Span1.set_InnerHtml("Error: you must enter a file name"); } else if (HtmlInputFile1.get_PostedFile() != null) { String tempPath = Environment.GetFolderPath(Environment.SpecialFolder. InternetCache) + "\\"; try { HtmlInputFile1.get_PostedFile().SaveAs(tempPath + HtmlInputText1. get_Value()); Span1.set_InnerHtml("File uploaded successfully to:<br><b>" + tempPath + HtmlInputText1.get_Value() + "</b><br>on the Web server"); } catch (Exception ex) { Span1.set_InnerHtml("Error saving file:<br><b>" + tempPath + HtmlInputText1.get_Value() + "</b><br>" + ex.ToString()); } } } //Button1_Click </script> </HEAD> <body> <form id="Form1" method="post" runat="server" enctype="multipart/form-data"> <h3>Custom HtmlInputFile - OnPreRender - VJ# Example</h3> Select File to Upload: <aspSample:CustomHtmlInputFileOnPreRender id="HtmlInputFile1" type="file" runat="server" name="HtmlInputFile1"> </p> <p> Save as filename (no path): <input id="HtmlInputText1" type="text" runat="server" name="Text1"> </p> <p> <span id="Span1" style="font: 8pt verdana;" runat="server" /> </p> <p> <input type="button" id="Button1" value="Upload" OnServerClick="Button1_Click" runat="server" name="Button1"> </p> </form> </body> </HTML>
Imports System.Web Imports System.Security.Permissions Namespace Samples.AspNet.VB.Controls <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class CustomHtmlInputFileOnPreRender Inherits System.Web.UI.HtmlControls.HtmlInputFile Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs) ' Call the base OnPreRender method. MyBase.OnPreRender(e) ' Add a Title attribute to the HtmlInputFile control. Me.Attributes.Add("title", "Click the Browse button to select a file to upload.") End Sub End Class End Namespace
using System.Web; using System.Security.Permissions; namespace Samples.AspNet.CS.Controls { [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class CustomHtmlInputFileOnPreRender : System.Web.UI.HtmlControls.HtmlInputFile { protected override void OnPreRender(System.EventArgs e) { // Call the base OnPreRender method. base.OnPreRender(e); // Add a Title attribute to the HtmlInputFile control. this.Attributes.Add("title", "Click the Browse button to select a file to upload."); } } }
package Samples.AspNet.JSL.Controls; public class CustomHtmlInputFileOnPreRender extends System.Web.UI.HtmlControls.HtmlInputFile { protected void OnPreRender(System.EventArgs e) { // Call the base OnPreRender method. super.OnPreRender(e); // Add a Title attribute to HtmlInputFile. this.get_Attributes().Add("title", "Click the Browse button to select a file to upload."); } //OnPreRender } //CustomHtmlInputFileOnPreRender

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
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