我正在尝试构建一个Web应用程序，允许最终用户选择特定的日期和文件类型，并在所选NAS上的所选日期之前删除该文件的所有类型。问题是，有些NAS可能拥有高达39TB的数据，当我的代码尝试枚举所有这些文件时，我的网页将会超时。
我曾尝试使用后台工作人员来帮助，但这似乎没有任何区别。如果有人可以看看下面的代码，也许可以指出一个更好的方向。
<div class="PanelColour">
<div class="auto-style3">
<img src="Images/MainLogo.jpg" class="auto-style3" />
</div>
<div>
<span class="heading">Select a Nas </span>
<div>
</div>
<asp:DropDownList ID="DropDownList1" runat="server" CssClass="MainText" Width="230px" AutoPostBack="True">
<asp:ListItem Text="dubfilm01-nas" Value="1"></asp:ListItem>
<asp:ListItem Text="dubfilm02-nas" Value="2"></asp:ListItem>
<asp:ListItem Text="dubfilm03-nas" Value="3"></asp:ListItem>
<asp:ListItem Text="dubfilm04-nas" Value="4"></asp:ListItem>
<asp:ListItem Text="dubfilm05-nas" Value="5"></asp:ListItem>
<asp:ListItem Text="dubfilm06-nas" Value="6"></asp:ListItem>
<asp:ListItem Text="dubfilm07-nas" Value="7"></asp:ListItem>
<asp:ListItem Text="dubfilm08-nas" Value="8"></asp:ListItem>
<asp:ListItem Text="dubfilm09-nas" Value="9"></asp:ListItem>
<asp:ListItem Text="dubfilm10-nas" Value="10"></asp:ListItem>
<asp:ListItem Text="dubfilm11-nas" Value="11"></asp:ListItem>
<asp:ListItem Text="dubfilm12-nas" Value="12"></asp:ListItem>
<asp:ListItem Text="dubfilm13-nas" Value="13"></asp:ListItem>
<asp:ListItem Text="dubfilm14-nas" Value="14"></asp:ListItem>
<asp:ListItem Text="dubfilm15-nas" Value="15"></asp:ListItem>
<asp:ListItem Text="dubfilm16-nas" Value="16"></asp:ListItem>
<asp:ListItem Text="dubfilm17-nas" Value="17"></asp:ListItem>
<asp:ListItem Text="dubfilm18-nas" Value="18"></asp:ListItem>
<asp:ListItem Text="dubfilm19-nas" Value="19"></asp:ListItem>
<asp:ListItem Text="dubfilm20-nas2" Value="20"></asp:ListItem>
<asp:ListItem Text="dubfilm21-nas2" Value="21"></asp:ListItem>
<asp:ListItem Text="dubfilm22-nas2" Value="22"></asp:ListItem>
<asp:ListItem Text="dubfilm23-nas2" Value="23"></asp:ListItem>
<asp:ListItem Text="dubfilm24-nas" Value="24"></asp:ListItem>
<asp:ListItem Text="dubfilm25-nas" Value="25"></asp:ListItem>
<asp:ListItem Text="dubfilm26-nas" Value="26"></asp:ListItem>
<asp:ListItem Text="Select a Nas" Value="27" Selected="True"></asp:ListItem>
</asp:DropDownList>
<div class="auto-style4">
<table class="auto-style6">
<tr class="subheading">
<th class="auto-style5">Select files to delete</th>
<th class="auto-style7"> Select date to delete from</th>
</tr>
<tr>
<td class="auto-style5">
<asp:CheckBoxList ID="CheckBoxList1" runat="server" Width="203px" Height="184px">
<asp:ListItem Text=" Image files " Value="jpeg" class="MainText"></asp:ListItem>
<asp:ListItem Text=" Text files " Value="jpeg" class="MainText"></asp:ListItem>
<asp:ListItem Text=" All files " Value="jpeg" class="MainText"></asp:ListItem>
</asp:CheckBoxList>
</td>
<td class="auto-style7">
<asp:Calendar ID="Calendar1" runat="server" BackColor="White" BorderColor="White" BorderWidth="1px" Font-Names="Verdana" Font-Size="10pt" ForeColor="Black" Height="196px" Width="488px" CssClass="MainText" NextPrevFormat="FullMonth">
<DayHeaderStyle Font-Bold="True" Font-Size="11pt" />
<NextPrevStyle Font-Size="8pt" ForeColor="#333333" Font-Bold="True" VerticalAlign="Bottom" />
<OtherMonthDayStyle ForeColor="#999999" />
<SelectedDayStyle BackColor="#333399" ForeColor="White" />
<TitleStyle BackColor="White" BorderColor="Black" BorderWidth="4px" Font-Bold="True" Font-Size="12pt" ForeColor="#333399" />
<TodayDayStyle BackColor="#CCCCCC" />
</asp:Calendar>
</td>
<td class="auto-style8">
<asp:Button ID="Button2" runat="server" Text="Delete " CssClass="buttonBL" OnClick="Button2_Click" Width="98px" />
</td>
</tr>
</table>
</div>
<div>
</div>
<br />
<div>
<asp:Button ID="Button1" runat="server" Text="Navigate to Folder" Class="buttonBL" Height="57px" OnClick="Button1_Click" Width="161px" />
                              
<asp:TextBox ID="TextBox1" runat="server" Height="51px" Width="787px" CssClass="MainText"></asp:TextBox>
</div>
</tr>
<br />
</div>
</form>
这背后的c＃代码就像这样
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Trinet.Networking;
public partial class Admin : System.Web.UI.Page
{
private static BackgroundWorker worker = new BackgroundWorker();
private event EventHandler BackgroundWorkFinished;
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
worker.ProgressChanged += worker_ProgressChanged;
worker.WorkerReportsProgress = true;
worker.WorkerSupportsCancellation = true;
}
}
protected void Button2_Click(object sender, EventArgs e)
{
DateTime d2 = Calendar1.SelectedDate;
string nas = DropDownList1.SelectedItem.Text;
object[] args = { d2, nas };
if (worker.IsBusy != true)
{
worker.RunWorkerAsync(args);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
startInfo.FileName = "cmd.exe";
string _path = "\\\\" + DropDownList1.SelectedItem.Text;
startInfo.Arguments = string.Format("/C start {0}", _path);
process.StartInfo = startInfo;
process.Start();
}
catch
{
}
}
private int Getfilesdate(DateTime d2)
{
try
{
DateTime d1 = DateTime.Now;
// DateTime d2 = Calendar1.SelectedDate;
TimeSpan t = d1 - d2;
int NrOfDays = Convert.ToInt16(t.TotalDays);
return (NrOfDays);
}
catch
{
return 0;
}
}
private void getfiles(int days,string path)
{
uncpath(path, days);
}
private string uncpath(string server, int days)
{
string nas = server;
string SI = "";
ShareCollection shi = ShareCollection.LocalShares;
if (server != null && server.Trim().Length > 0)
{
shi = ShareCollection.GetShares(server);
if (shi != null)
{
foreach (Share si in shi)
{
deletefiles(si.ToString(), days);
}
return "";
}
}
return "";
}
private void deletefiles(string path, int days)
{
try
{
// int nofiles = Directory.EnumerateFiles(path, "*.*", SearchOption.AllDirectories)
// .Where(s => s.ToLower().EndsWith(".tiff") || s.ToLower().EndsWith(".jpg")).Count();
TextBox1.Text = string.Empty;
// TextBox1.Text = "There are "+nofiles + " in all directories";
int i = 1;
worker.ReportProgress(i);
var files = Directory.EnumerateFiles(path, "*.*", SearchOption.AllDirectories)
.Where(s => s.ToLower().EndsWith(".tiff") || s.ToLower().EndsWith(".jpg"));
foreach (string file in files)
{
FileInfo info = new FileInfo(file);
if (info.LastWriteTime < DateTime.Now.AddDays(-days))
{
File.Delete(file);
}
}
}
catch
{
}
}
private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
int i = Convert.ToInt16( e.ProgressPercentage);
if (i == 0)
{
TextBox1.Text = "Gathering file information.................";
}
else
{
TextBox1.Text = "..............This may take a while, grab a cup of coffee";
}
}
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
Object[] arg = e.Argument as Object[];
string path = (string)arg[1];
DateTime d2 = (DateTime)Convert.ToDateTime(arg[0]);
int i = 0;
worker.ReportProgress(i);
int NrofDays = Getfilesdate(d2);
getfiles(NrofDays,path);
}
private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
TextBox1.Text = string.Empty;
TextBox1.Text = "Completed";
}
}
我真的很感激一些帮助
由于
答案 0 :(得分：2)
枚举文件是一个相对较慢的操作，在网络上更是如此。
我会在您计划定期更新的数据库中保留文件信息的副本，例如在Windows服务或Hangfire作业中。
然后，您可以显示数据库中的文件信息，还可以获得索引（更快的搜索）和分页（更快的网页响应时间）。