Tự động đổi tên File khi Upload trong Asp.net

By Unknown - Friday, August 21, 2015 - No Comments

(FileUpload ReName File Before Upload in ASP.NET) – Khi Upload file lên Server trong trường hợp file Upload trùng với tên file đã tồn tại, chương trình sẽ tự động ghi đè file mới lên file cũ. Vậy làm sao để giải quyết vấn đề này? Có một cách để giải quyết, đó là tự động đổi tên file ngay trong quá trình Upload lên Server. Bài viết dưới đây sẽ hướng dẫn các bạn làm điều đó, và mỗi khi Upload File chương trình sẽ tự động lấy tên file gốc cộng với thời gian Upload. Và như vậy khi Upload file bạn sẽ không bao giờ lo sợ vấn đề bị trùng tên nữa.

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- B1: Tạo Project trong Microsoft Visual Studio 2010

- B2: Mở file Default.aspx dưới dạng HTML và nhập mã HTML

C# Code

<%@ Page Title="Rename File Name during Uploading in Asp.Net" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RenameFileNameDuringUploading._Default" %>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

<tr>

<td>

<asp:label id="lblHeader" runat="server" Text="File Upload"></asp:label>

</div>

<tr>

<asp:label id="plFileName" runat="server" Text="File Name (*)"></asp:label>

</td>

<td>

<asp:FileUpload ID="FileUpload" runat="server" Width="150px" /><br />

<asp:CustomValidator id="valFile" runat="server" CssClass="NormalRed" ValidationGroup="validate" OnServerValidate="valFile_ServerValidate" ErrorMessage="You Must Upload A File" Display="Dynamic"></asp:CustomValidator>

</td>

</tr>

<tr>

<asp:label id="lblMessage" runat="server" Visible="false"></asp:label><br />

</td>

</tr>

</table>

</div>

<asp:LinkButton id="cmdUpload" runat="server" CssClass="btn btn-small" OnClick="cmdUpload_Click" ValidationGroup="validate" Causesvalidation="true">

</asp:LinkButton>

</div>

</td>

</tr>

</table>

</asp:Content>

VB.NET Code

<%@ Page Title="How to extract a folder from zip file using SharpZipLib in ASP.Net" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="UsingSharpZipLibUnzipFile._Default" %>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

<tr>

<td>

<asp:label id="lblHeader" runat="server" Text="File Upload"></asp:label>

</div>

<tr>

<asp:label id="plFileName" runat="server" Text="File Name (*)"></asp:label>

</td>

<td>

<asp:FileUpload ID="FileUpload" runat="server" Width="150px" /><br />

<asp:CustomValidator id="valType" runat="server" CssClass="NormalRed" ValidationGroup="validate" OnServerValidate="valType_ServerValidate" Display="Dynamic"></asp:CustomValidator>

</td>

</tr>

<tr>

<asp:label id="lblMessage" runat="server" Visible="false"></asp:label><br />

</td>

</tr>

</table>

</div>

<asp:LinkButton id="cmdUpload" runat="server" CssClass="btn btn-small" OnClick="cmdUpload_Click" ValidationGroup="validate" Causesvalidation="true">

</asp:LinkButton>

</div>

</td>

</tr>

</table>

</asp:Content>

- B3: Viết Code cho file Default.aspx

C# Code

//Visit http://www.laptrinhdotnet.com for more ASP.NET Tutorials

using Microsoft.VisualBasic;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data;

using System.IO;

using System.Diagnostics;

using System.Web.UI;

using System.Web;

using System.Web.UI.WebControls;

namespace RenameFileNameDuringUploading

{

public partial class _Default : System.Web.UI.Page

{

#region "Private Members"

string FilePath = "";

#endregion

#region "Private Methods"

protected string UploadFile(HttpPostedFile file)

{

string fileName = null;

string fileExtension = null;

string strDate = DateTime.Now.ToString("MM_dd_yyyy_hh_mm_ss");

SetFilePath();

fileExtension = Path.GetExtension(file.FileName).Replace(".", "");

fileName = file.FileName.Substring(file.FileName.LastIndexOf("\\\\") + 1);

fileName = fileName.Substring(0, fileName.LastIndexOf(fileExtension)) + strDate + "." + fileExtension;

FilePath = FilePath + fileName;

file.SaveAs(FilePath);

return fileName;

}

private void SetFilePath()

{

FilePath = MapPath("~/Upload/");

if (!Directory.Exists(FilePath))

{

Directory.CreateDirectory(FilePath);

}

#endregion

#region "Event Handles"

protected void cmdUpload_Click(object sender, System.EventArgs e)

{

if (Page.IsValid)

{

try

{

string sFileName = "";

HttpFileCollection hfc = Request.Files;

for (int i = 0; i <= hfc.Count - 1; i++)

{

HttpPostedFile hpf = hfc[i];

if (hpf.ContentLength > 0)

{

sFileName = UploadFile(hpf);

}

catch

{

lblMessage.Text = "Upload file Error";

lblMessage.ForeColor = System.Drawing.Color.Red;

lblMessage.Visible = true;

}

finally

{

lblMessage.Text = "Upload file Sucessfully";

lblMessage.ForeColor = System.Drawing.Color.Green;

lblMessage.Visible = true;

}

protected void valFile_ServerValidate(object source, ServerValidateEventArgs args)

{

if (FileUpload.PostedFile != null)

{

if (FileUpload.PostedFile.ContentLength > 0)

{

args.IsValid = true;

}

else

{

args.IsValid = false;

}

#endregion

}

VB.NET Code

'Visit http://www.laptrinhdotnet.com for more ASP.NET Tutorials

Imports System.IO

Namespace RenameFileNameDuringUploading

Public Class _Default

Inherits System.Web.UI.Page

#Region "Private Members"

Private FilePath As String = ""

#End Region

#Region "Private Methods"

Protected Function UploadFile(ByVal file As HttpPostedFile) As String

Dim fileName As String

Dim fileExtension As String

Dim strDate As String = Now.ToString("MM_dd_yyyy_hh_mm_ss")

SetFilePath()

fileExtension = Replace(Path.GetExtension(file.FileName), ".", "")

fileName = file.FileName.Substring(file.FileName.LastIndexOf("\\") + 1)

fileName = fileName.Substring(0, fileName.LastIndexOf(fileExtension)) & strDate & "." & fileExtension

FilePath = FilePath + fileName

file.SaveAs(FilePath)

Return fileName

End Function

Private Sub SetFilePath()

FilePath = MapPath("~/Upload/")

If Not Directory.Exists(FilePath) Then

Directory.CreateDirectory(FilePath)

End If

End Sub

#End Region

#Region "Event Handles"

Private Sub cmdUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdUpload.Click

If Page.IsValid Then

Try

Dim sFileName As String = ""

Dim hfc As HttpFileCollection = Request.Files

For i As Integer = 0 To hfc.Count - 1

Dim hpf As HttpPostedFile = hfc(i)

If hpf.ContentLength > 0 Then

sFileName = UploadFile(hpf)

End If

Next i

Catch ex As Exception

lblMessage.Text = ex.Message

lblMessage.ForeColor = System.Drawing.Color.Red

lblMessage.Visible = True

Exit Sub

Finally

lblMessage.Text = "Upload file Sucessfully"

lblMessage.ForeColor = System.Drawing.Color.Green

lblMessage.Visible = True

End Try

End If

End Sub

Private Sub valFile_ServerValidate(ByVal source As System.Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles valFile.ServerValidate

Try

If Not (FileUpload.PostedFile Is Nothing) Then

If (FileUpload.PostedFile.ContentLength > 0) Then

args.IsValid = True

Return

End If

args.IsValid = False

Catch exc As Exception

End Try

End Sub

#End Region

End Class

End Namespace

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