(How to download multi files in ASP.Net) – Khi có 1 danh sách các file cần Download, nếu phải kích vào từng File để Download thì mất rất nhiều thời gian cho người dùng. Vậy có cách nào để có thể chọn các file cần và Click một lần là toàn bộ các file này sẽ được Download. Bài viết dưới đây sẽ hướng dẫn các bạn thực hiện điều đó.

Nghe những bài hát đỉnh nhất về Thấy cô giáo - Nghe trên Youtube

- B1: Tạo Project trong Microsoft Visual Studio 2010

- B2: Download thư viện SharpZipLib.dll và References vào Project

- B3: Mở file Default.aspx dưới dạng HTML và nhập mã HTML
C# Code

<%@ PageTitle="Download Multiple Files in ASP.Net using C# and VB.Net" Language="C#"MasterPageFile="~/Site.master"AutoEventWireup="true"CodeBehind="Default.aspx.cs"Inherits="DownloadMultipleFiles._Default"%>

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

<tr>

<td>

<divclass="panel panel-default">

<divclass="panel-heading">

<asp:label id="lblHeader" runat="server" Text="Download Multiple Files"></asp:label>

</div>

<divclass="panel-body">

<tr>

<td>

<asp:LinkButton id="cmdDownload"runat="server"CssClass="btn btn-small" OnClick="cmdDownload_Click" Causesvalidation="false">

</asp:LinkButton>

</td>

</tr>

<tr>

<td>

<asp:GridView ID="grvObject"runat="server"AllowPaging="true"PageSize="8"

CssClass="GridStyle"BorderColor="#cbcbcb"BorderStyle="solid"

BorderWidth="1"AutoGenerateColumns="false"width="100%"onrowdatabound="grvObject_RowDataBound">

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField>

<ItemStyleHorizontalAlign="Center"width="1%"/>

<asp:CheckBox ID="chkAll" runat="server"/>

</HeaderTemplate>

<asp:CheckBox ID="chkSelect"runat="server"/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Name"SortExpression="Name">

<asp:Label ID="lblFileName"Visible="false"runat="server"></asp:Label>

<asp:Literal runat="server"ID="ltlFileItem"></asp:Literal>

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField="CreationTime"HeaderText="Creation Time" SortExpression="CreationTime" />

<asp:BoundField DataField="LastWriteTime"HeaderText="Date Modified" SortExpression="LastWriteTime" />

<asp:TemplateField HeaderText="Size"SortExpression="Size"ItemStyle-HorizontalAlign="Right">

<%# DisplaySize((long?) Eval("Size")) %>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</div>

</td>

</tr>

</table>

</asp:Content>

VB.NET Code

<%@ PageTitle="Download Multiple Files in ASP.Net using C# and VB.Net" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"CodeBehind="Default.aspx.vb"Inherits="DownloadMultipleFiles._Default"%>

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

<tr>

<td>

<divclass="panel panel-default">

<divclass="panel-heading">

<asp:label id="lblHeader" runat="server" Text="Download Multiple Files"></asp:label>

</div>

<divclass="panel-body">

<tr>

<td>

<asp:LinkButton id="cmdDownload"runat="server"CssClass="btn btn-small" Causesvalidation="false">

</asp:LinkButton>

</td>

</tr>

<tr>

<td>

<asp:GridView ID="grvObject"runat="server"AllowPaging="true"PageSize="8"

CssClass="GridStyle"BorderColor="#cbcbcb"BorderStyle="solid"

BorderWidth="1"AutoGenerateColumns="false"width="100%">

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField>

<ItemStyleHorizontalAlign="Center"width="1%"/>

<asp:CheckBox ID="chkAll" runat="server"/>

</HeaderTemplate>

<asp:CheckBox ID="chkSelect"runat="server"/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Name" SortExpression="Name">

<asp:Label ID="lblFileName"Visible="false"runat="server"></asp:Label>

<asp:Literal runat="server"ID="ltlFileItem"></asp:Literal>

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField="CreationTime" HeaderText="Creation Time" SortExpression="CreationTime" />

<asp:BoundField DataField="LastWriteTime"HeaderText="Date Modified" SortExpression="LastWriteTime" />

<asp:TemplateField HeaderText="Size"SortExpression="Size"ItemStyle-HorizontalAlign="Right">

<%# DisplaySize(CType(Eval("Size"), Nullable(Of Long))) %>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</div>

</td>

</tr>

</table>

</asp:Content>

- B4: Trong Visual Studio tạo 1 Class có tên: FileSystemItem và nhập đoạn Code phía dưới cho Class này.
C# Code

using Microsoft.VisualBasic;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data;

using System.Diagnostics;

using System.IO;

public class FileSystemItem

{

public FileSystemItem(FileInfofile)

{

this.Name = file.Name;

this.FullName = file.FullName;

this.Size = file.Length;

this.CreationTime = file.CreationTime;

this.LastAccessTime = file.LastAccessTime;

this.LastWriteTime = file.LastWriteTime;

}

public string Name { get; set; }

public stringFullName { get; set; }

public Nullable<long> Size { get; set; }

public DateTimeCreationTime { get; set; }

public DateTimeLastAccessTime { get; set; }

public DateTimeLastWriteTime { get; set; }

}

VB.NET Code

Imports System.IO

Public Class FileSystemItem

Public Sub New(ByVal file As FileInfo)

Me.Name = file.Name

Me.FullName = file.FullName

Me.Size = file.Length

Me.CreationTime = file.CreationTime

Me.LastAccessTime = file.LastAccessTime

Me.LastWriteTime = file.LastWriteTime

End Sub

Public Property Name As String

Public PropertyFullName As String

Public Property Size As Nullable(Of Long)

Public PropertyCreationTime As DateTime

Public PropertyLastAccessTime As DateTime

Public PropertyLastWriteTime As DateTime

End Class

- B5: 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.UI.WebControls;

using ICSharpCode.SharpZipLib.Zip;

namespace DownloadMultipleFiles

{

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

{

#region"Private Members"

string FilePath = "";

#endregion

#region"Private Methods"

private voidSetFilePath()

{

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

if (!Directory.Exists(FilePath))

{

Directory.CreateDirectory(FilePath);

}

protected stringDisplaySize(long? size)

{

if (size == null)

return string.Empty;

else

{

if (size < 1024)

return string.Format("{0:N0} bytes", size.Value);

else

return String.Format("{0:N0} KB", size.Value / 1024);

}

private stringGetFullyQualifiedFolderPath(string folderPath)

{

if (folderPath.StartsWith("~"))

{

return Server.MapPath(folderPath);

}

else

{

return folderPath;

}

#endregion

#region"GridView Methods"

protected voidgrvObject_RowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgse)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

FileSystemItem item = (FileSystemItem)e.Row.DataItem;

LabellblFileName = (Label)e.Row.FindControl("lblFileName");

if (lblFileName != null)

{

lblFileName.Text = item.FullName;

}

Literal ltlFileItem = (Literal)e.Row.FindControl("ltlFileItem");

if (lblFileName != null)

{

ltlFileItem.Text = item.Name;

}

#endregion

#region"Bind Data"

private voidBindData()

{

DirectoryInfo currentDirInfo = new DirectoryInfo(GetFullyQualifiedFolderPath(FilePath));

dynamic folders = currentDirInfo.GetDirectories();

dynamic files = currentDirInfo.GetFiles();

var fsItems = new List<FileSystemItem>(folders.Length + files.Length);

foreach (var file in files)

fsItems.Add(new FileSystemItem(file));

grvObject.DataSource = fsItems;

grvObject.DataBind();

}

#endregion

#region"Event Handles"

protected voidPage_Load(object sender, System.EventArgs e)

{

try

{

if (!IsPostBack)

{

SetFilePath();

BindData();

}

catch

{

}

private voidDownloadFile(string filepath)

{

if (!string.IsNullOrEmpty(filepath))

{

System.IO.FileInfo file = new System.IO.FileInfo(filepath);

if (file.Exists)

{

Response.Clear();

Response.ClearContent();

Response.ClearHeaders();

Response.BufferOutput = false;

Response.ContentType = "application/zip";

Response.AddHeader("content-disposition", "attachment; filename=" + file.Name);

Response.WriteFile(file.FullName);

file.Delete();

Response.End();

}

else

{

Response.Write("This file does not exist.");

}

else

{

Response.Write("Please provide a file to download.");

}

protected voidcmdDownload_Click(object sender, System.EventArgs e)

{

try

{

SetFilePath();

int intCount = grvObject.Rows.Count;

CheckBox chkSelect = default(CheckBox);

Label lblLabel = default(Label);

int i = 0;

if (intCount > 0)

{

string sZipFileName = string.Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MM-dd-HHmmss"));

ZipOutputStream s = new ZipOutputStream(File.Create(FilePath + "\\"+ sZipFileName));

s.SetLevel(9);

byte[] buffer = null;

buffer = new byte[4097];

for (i = 0; i <= intCount - 1; i++)

{

chkSelect = (CheckBox)grvObject.Rows[i].FindControl("chkSelect");

lblLabel = (Label)grvObject.Rows[i].FindControl("lblFileName");

if ((chkSelect != null) & (lblLabel != null))

{

string FileName = "";

if(lblLabel != null)

{

FileName = lblLabel.Text;

}

if (!string.IsNullOrEmpty(FileName) && chkSelect.Checked)

{

ZipEntry entry = newZipEntry(Path.GetFileName(FileName));

entry.DateTime = DateTime.Now;

s.PutNextEntry(entry);

FileStream fs = File.OpenRead(FileName);

int sourceBytes = 1;

while (!((sourceBytes <= 0)))

{

sourceBytes = fs.Read(buffer, 0, buffer.Length);

s.Write(buffer, 0, sourceBytes);

}

fs.Close();

}

s.Finish();

s.Close();

DownloadFile(FilePath + "\\"+ sZipFileName);

}

catch

{

return;

}

finally

{

}

#endregion

}

VB.Net Code

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

Imports System.IO

Imports ICSharpCode.SharpZipLib.Zip

Imports ICSharpCode.SharpZipLib.Checksums

Imports ICSharpCode.SharpZipLib.GZip

Namespace DownloadMultipleFiles

Public Class _Default

Inherits System.Web.UI.Page

#Region "Private Members"

Private FilePath As String = ""

#End Region

#Region "Private Methods"

Private Sub SetFilePath()

FilePath = MapPath("~/Upload")

If Not Directory.Exists(FilePath) Then

Directory.CreateDirectory(FilePath)

End If

End Sub

Protected FunctionDisplaySize(ByVal size AsNullable(Of Long)) As String

If size Is Nothing Then

Return String.Empty

Else

If size < 1024 Then

Return String.Format("{0:N0} bytes", size.Value)

Else

Return String.Format("{0:N0} KB", size.Value / 1024)

End If

End Function

Private FunctionGetFullyQualifiedFolderPath(ByVal folderPath As String) As String

If folderPath.StartsWith("~") Then

ReturnServer.MapPath(folderPath)

Else

Return folderPath

End If

End Function

#End Region

#Region "GridView Methods"

Protected SubgrvObject_RowDataBound(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewRowEventArgs) Handles grvObject.RowDataBound

If e.Row.RowType = DataControlRowType.DataRow Then

Dim item AsFileSystemItem = CType(e.Row.DataItem, FileSystemItem)

Dim lblFileName AsLabel = CType(e.Row.FindControl("lblFileName"), Label)

If NotlblFileName Is NothingThen

lblFileName.Text = item.FullName

End If

Dim ltlFileItem AsLiteral = CType(e.Row.FindControl("ltlFileItem"), Literal)

If NotlblFileName Is NothingThen

ltlFileItem.Text = item.Name

End If

End Sub

#End Region

#Region "Bind Data"

Private SubBindData()

Dim currentDirInfo AsNew DirectoryInfo(GetFullyQualifiedFolderPath(FilePath))

Dim folders = currentDirInfo.GetDirectories()

Dim files = currentDirInfo.GetFiles()

Dim fsItems As New List(Of FileSystemItem)(folders.Length + files.Length)

For Each file In files

fsItems.Add(New FileSystemItem(file))

grvObject.DataSource = fsItems

grvObject.DataBind()

End Sub

#End Region

#Region "Event Handles"

Protected SubPage_Load(ByVal sender AsObject, ByVal e As System.EventArgs) Handles Me.Load

Try

If Page.IsPostBack = False Then

SetFilePath()

BindData()

EndIf

Catch ex As Exception

End Try

End Sub

Private SubDownloadFile(ByVal filepath As String)

If filepath <> ""Then

Dim file AsNew System.IO.FileInfo(filepath)

If file.Exists Then

Response.Clear()

Response.ClearContent()

Response.ClearHeaders()

Response.BufferOutput = False

Response.ContentType = "application/zip"

Response.AddHeader("content-disposition", "attachment; filename=" + file.Name)

Response.WriteFile(file.FullName)

file.Delete()

Response.End()

Else

Response.Write("This file does not exist.")

End If

Else

Response.Write("Please provide a file to download.")

End If

End Sub

Private SubcmdDownload_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdDownload.Click

Try

SetFilePath()

Dim intCount AsInteger = grvObject.Rows.Count

Dim chkSelect AsCheckBox

Dim lblLabel AsLabel

Dim i AsInteger

If intCount > 0 Then

Dim sZipFileName As String = String.Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MM-dd-HHmmss"))

Dim s AsZipOutputStream = NewZipOutputStream(File.Create(FilePath & "\" & sZipFileName))

s.SetLevel(9)

Dim buffer() AsByte

ReDim buffer(4096)

For i = 0 TointCount - 1

chkSelect = CType(grvObject.Rows(i).FindControl("chkSelect"), CheckBox)

lblLabel = CType(grvObject.Rows(i).FindControl("lblFileName"), Label)

If Not chkSelect Is Nothing And Not lblLabel Is Nothing Then

DimFileName As String= ""

If Not lblLabel Is Nothing Then

FileName = lblLabel.Text

End If

If FileName <> ""AndAlso chkSelect.Checked Then

Dim entry As ZipEntry = New ZipEntry(Path.GetFileName(FileName))

entry.DateTime = DateTime.Now

s.PutNextEntry(entry)

Dimfs As FileStream= File.OpenRead(FileName)

Dim sourceBytes As Integer = 1

Do Until (sourceBytes <= 0)

sourceBytes = fs.Read(buffer, 0, buffer.Length)

s.Write(buffer, 0, sourceBytes)

Loop

fs.Close()

End If

s.Finish()

s.Close()

DownloadFile(FilePath & "\"& sZipFileName)

End If

Catch ex As Exception

Exit Sub

Finally

End Try

End Sub

#End Region

End Class

End Namespace

Chạy Project, mỗi khi lựa chọn file và kích nút Download, toàn bộ các file được chọn sẽ được ZIP thành 1 file và Download về PC của người dùng.

Chúc các bạn thành công!

Quang Bình

1 comments Blogger 1 Facebook

AnonymousMarch 26, 2022 at 9:36 PM
Nhiều File Cho Một Lần Click Trong Asp.Net
-
Lập Trình Đốt Nét >>>>> Download Now

>>>>> Download Full

Nhiều File Cho Một Lần Click Trong Asp.Net
-
Lập Trình Đốt Nét >>>>> Download LINK

>>>>> Download Now

Nhiều File Cho Một Lần Click Trong Asp.Net
-
Lập Trình Đốt Nét >>>>> Download Full

>>>>> Download LINK

Download nhiều file cho một lần Click trong Asp.net

1 comments Blogger 1 Facebook

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