в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

Admin: 1 версия

2010-05-26T12:00:52Z

1 версия

Новая страница

== Accepting File Uploads==



<source lang="csharp">
Important properties, events
Enabled: disable the FileUpload control.
FileBytes: get the uploaded file as a byte array.
FileContent: get the uploaded file as a stream.
FileName: get the name of the file uploaded.
HasFile: Returns True when a file has been uploaded.
PostedFile: get the uploaded file wrapped in the HttpPostedFile object.
Focus: set the form focus to the FileUpload control.
SaveAs: save the uploaded file to the file system.
<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>
<!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 btnAdd_Click(object sender, EventArgs e)
{
if (upImage.HasFile)
{
if (CheckFileType(upImage.FileName))
{
String filePath = "~/UploadImages/" + upImage.FileName;
upImage.SaveAs(MapPath(filePath));
}
}
}
bool CheckFileType(string fileName)
{
string ext = Path.GetExtension(fileName);
switch (ext.ToLower())
{
case ".png":
return true;
case ".jpg":
return true;
default:
return false;
}
}
void Page_PreRender()
{
string upFolder = MapPath("~/UploadImages/");
DirectoryInfo dir = new DirectoryInfo(upFolder);
dlstImages.DataSource = dir.GetFiles();
dlstImages.DataBind();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>FileUpload File</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblImageFile"
Text="Image File:"
AssociatedControlID="upImage"
Runat="server" />
<asp:FileUpload
id="upImage"
Runat="server" />
<br /><br />
<asp:Button
id="btnAdd"
Text="Add Image"
OnClick="btnAdd_Click"
Runat="server" />
<hr />
<asp:DataList
id="dlstImages"
RepeatColumns="3"
runat="server">
<ItemTemplate>
<asp:Image ID="Image1"
ImageUrl="<%# Eval("Name", "~/UploadImages/{0}") %>"
style="width:200px"
Runat="server" />
<br />
<%# Eval("Name") %>
</ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html></source>

== Changing the file-size limitation setting in the web.config file==



<source lang="csharp">
<httpRuntime
idleTime="15"
executionTimeout="90"
maxRequestLength="4096"
useFullyQualifiedRedirectUrl="False"
minFreeThreads="8"
minLocalRequestFreeThreads="4"
appRequestQueueLimit="100"
/></source>

== FileUpload Test==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="FileUploadTest" %>
<!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 runat="server">
<title>FileUpload Control Test</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Choose a file to upload to the server<br />
<asp:FileUpload ID="fupTest" runat="server" Width="400px"/>
<br />
<asp:Button ID="btnUpload" runat="server" Text="Upload File" OnClick="btnUpload_Click" />
<asp:Label ID="labMessage" runat="server"></asp:Label>
<asp:Label ID="labInfo" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class FileUploadTest : System.Web.UI.Page
{
protected void btnUpload_Click(object sender, EventArgs e)
{
try
{
if (fupTest.HasFile)
{
string path = @"C:\temp\";
string fullname = path + fupTest.FileName;
if (System.IO.File.Exists(fullname))
{
labMessage.Text = "File already exists - uploaded cancelled";
}
else
{
fupTest.SaveAs(fullname);
labMessage.Text = "File successfully uploaded";
int contentLength = fupTest.PostedFile.ContentLength;
string contentType = fupTest.PostedFile.ContentType;
labInfo.Text = "Content Type = " + contentType;
labInfo.Text += "<br/>";
labInfo.Text += " Content Length = " + contentLength;
byte[] input = new byte[contentLength];
input = fupTest.FileBytes;
System.IO.Stream myStream = fupTest.FileContent;
int index = 0;
while (index < myStream.Length)
{
byte aByte = (byte)myStream.ReadByte();
index++;
}
}
}
else
{
labMessage.Text = "File was not specified";
}
}
catch
{
labMessage.Text = "File was not uploaded";
}
}
}</source>

== The user selects a file from the local disk and the page manages to persist it to a server location==



<source lang="csharp">
<%@ Page language="C#"%>
<%@ Import Namespace="System.IO" %>
<script runat="server">
void UploadButton_Click(object sender, EventArgs e)
{
string savePath = UploadPath.Text.ToLower();
if (!Directory.Exists(savePath))
{
Response.Write(String.Format("<h1>The upload path doesn"t exist: {0}</h1>",
savePath));
Response.End();
}
if (FileUpload1.HasFile)
{
string fileName = FileUpload1.FileName;
savePath += fileName;
FileUpload1.SaveAs(savePath);
UploadStatusLabel.Text = "File saved as: <i>" + savePath + "</i>";
}
else
{
UploadStatusLabel.Text = "You did not specify a file to upload.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>File Upload</title>
</head>
<body>
<div id="pageContent">
<form id="Form1" runat="server">
<h4>Select a picture to upload:</h4>
<b>Upload Path</b><br />
<asp:textbox id="UploadPath" runat="server" text="c:\temp\pictures\" />
<hr />
<b>Picture to upload</b><br />
<asp:fileupload id="FileUpload1" runat="server" />
<br /><br />

<asp:button id="UploadButton"
text="Upload"
onclick="UploadButton_Click"
runat="server">
</asp:button>

<hr />

<asp:label id="UploadStatusLabel" runat="server" />
</form>
</div>
</body>
</html></source>

== Upload file to server==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UploadFile" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="Uploader" runat="server" Height="24px" Width="472px" /> 
<asp:Button ID="cmdUpload" runat="server" Height="24px" OnClick="cmdUpload_Click"
Text="Upload" Width="88px" /><br />
<br />
<asp:Label ID="lblInfo" runat="server" EnableViewState="False" Font-Bold="True"></asp:Label></div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
public partial class UploadFile : System.Web.UI.Page
{
private string uploadDirectory;
protected void Page_Load(object sender, EventArgs e)
{
uploadDirectory = Path.rubine(Request.PhysicalApplicationPath, "Uploads");
}

protected void cmdUpload_Click(object sender, EventArgs e)
{
if (Uploader.PostedFile.FileName == "")
{
lblInfo.Text = "No file specified.";
}
else
{
string extension = Path.GetExtension(Uploader.PostedFile.FileName);
switch (extension.ToLower())
{
case ".png":
case ".jpg":
break;
default:
lblInfo.Text = "This file type is not allowed.";
return;
}
string serverFileName = Path.GetFileName(Uploader.PostedFile.FileName);
string fullUploadPath = Path.rubine(uploadDirectory,serverFileName);
try
{
Uploader.PostedFile.SaveAs(fullUploadPath);
lblInfo.Text = "File " + serverFileName;
lblInfo.Text += " uploaded successfully to ";
lblInfo.Text += fullUploadPath;
}
catch (Exception err)
{
lblInfo.Text = err.Message;
}
}
}
}</source>

== Uploading files using the new FileUpload control (C#)==



<source lang="csharp">
<%@ Page Language="C#"%>
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
try {
FileUpload1.SaveAs("C:\\Uploads\\" + FileUpload1.FileName);
Label1.Text = "File name: " +
FileUpload1.PostedFile.FileName + "<br>" +
FileUpload1.PostedFile.ContentLength + " kb<br>" +
"Content type: " +
FileUpload1.PostedFile.ContentType;
}
catch (Exception ex) {
Label1.Text = "ERROR: " + ex.Message.ToString();
}
else
{
Label1.Text = "You have not specified a file.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>FileUpload Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:FileUpload ID="FileUpload1" Runat="server" />

<asp:Button ID="Button1" Runat="server" Text="Upload"
OnClick="Button1_Click" />

<asp:Label ID="Label1" Runat="server"></asp:Label>
</form>
</body>
</html></source>

== Uploading files using the new FileUpload control (VB)==



<source lang="csharp">
<%@ Page Language="VB"%>
<script runat="server">
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
If FileUpload1.HasFile Then
Try
FileUpload1.SaveAs("C:\Uploads\" & _
FileUpload1.FileName)
Label1.Text = "File name: " & _
FileUpload1.PostedFile.FileName & "<br>" & _
"File Size: " & _
FileUpload1.PostedFile.ContentLength & " kb<br>" & _
"Content type: " & _
FileUpload1.PostedFile.ContentType
Catch ex As Exception
Label1.Text = "ERROR: " & ex.Message.ToString()
End Try
Else
Label1.Text = "You have not specified a file."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>FileUpload Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:FileUpload ID="FileUpload1" Runat="server" />

<asp:Button ID="Button1" Runat="server" Text="Upload"
OnClick="Button1_Click" />

<asp:Label ID="Label1" Runat="server"></asp:Label>
</form>
</body>
</html></source>

← Предыдущая	Версия 15:30, 26 мая 2010
(нет различий)

ASP.NET Tutorial/ASP.net Controls/FileUpload - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия