C# 如何使用asp.net从文件夹中删除特定文件
这里的交易我得到了一个叫做gridview1的datagridviewer和一个fileupload1，当我上传一个文件时，它用文件名和路径更新数据库中的gridview1和表，并将所述文件存储在文件夹“Mag”。。。但是现在我想做的是相反的，我得到了如何使用gridview删除表条目，但是从文件夹“Mag”中删除文件不起作用。我在C#或codebehind中使用了以下代码C# 如何使用asp.net从文件夹中删除特定文件,c#,asp.net,C#,Asp.net,这里的交易我得到了一个叫做gridview1的datagridviewer和一个fileupload1，当我上传一个文件时，它用文件名和路径更新数据库中的gridview1和表，并将所述文件存储在文件夹“Mag”。。。但是现在我想做的是相反的，我得到了如何使用gridview删除表条目，但是从文件夹“Mag”中删除文件不起作用。我在C#或codebehind中使用了以下代码 protected void GridView1_Del(object sender, EventArgs e) {
protected void GridView1_Del(object sender, EventArgs e)
{
string DeleteThis = GridView1.SelectedRow.Cells[0].Text;
string[] Files = Directory.GetFiles(@"i:/Website/WebSite3/Mag/");
foreach (string file in Files)
{
if (file.ToUpper().Contains(DeleteThis.ToUpper()))
{
File.Delete(file);
}
}
}
protected void FuntionName(object sender, GridViewDeleteEventArgs e)
{
// storing value from cell
TableCell cell = GridView1.Rows[e.RowIndex].Cells[0];
// full path required
string fileName = ("i:/Website/WebSite3/Mag/" + cell.Text);
if(fileName != null || fileName != string.Empty)
{
if((System.IO.File.Exists(fileName)))
{
System.IO.File.Delete(fileName);
}
}
}
OnRowDeleting="FuntionName"
OnRowDeleted=“FunctionName”它直接删除检查GridView1.SelectedRow不为空：
if (GridView1.SelectedRow == null) return;
string DeleteThis = GridView1.SelectedRow.Cells[0].Text;
这就是我删除文件的方式
if ((System.IO.File.Exists(fileName)))
{
System.IO.File.Delete(fileName);
}
void GridView1_SelectedIndexChanged(Object sender, EventArgs e)
{
// Get the currently selected row using the SelectedRow property.
GridViewRow row = CustomersGridView.SelectedRow;
//Debug this line and see what value is returned if it contains the full path.
//If it does not contain the full path then add the path to the string.
string fileName = row.Cells[0].Text
if(fileName != null || fileName != string.empty)
{
if((System.IO.File.Exists(fileName))
System.IO.File.Delete(fileName);
}
}
在我的项目中，我使用ajax，我在代码中创建了一个web方法，如下所示 前面
$("#attachedfiles a").live("click", function () {
var row = $(this).closest("tr");
var fileName = $("td", row).eq(0).html();
$.ajax({
type: "POST",
url: "SendEmail.aspx/RemoveFile",
data: '{fileName: "' + fileName + '" }',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function () { },
failure: function (response) {
alert(response.d);
}
});
row.remove();
});
[WebMethod]
public static void RemoveFile(string fileName)
{
List<HttpPostedFile> files = (List<HttpPostedFile>)HttpContext.Current.Session["Files"];
files.RemoveAll(f => f.FileName.ToLower().EndsWith(fileName.ToLower()));
if (System.IO.File.Exists(HttpContext.Current.Server.MapPath("~/Employee/uploads/" + fileName)))
{
System.IO.File.Delete(HttpContext.Current.Server.MapPath("~/Employee/uploads/" + fileName));
}
}
[WebMethod]
公共静态void RemoveFile（字符串文件名）
{
列表文件=（列表）HttpContext.Current.Session[“文件”]；
files.RemoveAll（f=>f.FileName.ToLower（）.EndsWith（FileName.ToLower（））；
如果（System.IO.File.Exists（HttpContext.Current.Server.MapPath（“~/Employee/uploads/”+fileName）））
{
System.IO.File.Delete（HttpContext.Current.Server.MapPath（“~/Employee/uploads/”+fileName））；
}
}
我认为这将帮助您。从路径中删除任何或特定的文件类型（例如“.bak”）。
string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";
try
{
string[] picList = Directory.GetFiles(sourceDir, "*.jpg");
string[] txtList = Directory.GetFiles(sourceDir, "*.txt");
// Copy picture files.
foreach (string f in picList)
{
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
// Use the Path.Combine method to safely append the file name to the path.
// Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true);
}
// Copy text files.
foreach (string f in txtList)
{
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
try
{
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName));
}
// Catch exception if the file was already copied.
catch (IOException copyError)
{
Console.WriteLine(copyError.Message);
}
}
// Delete source files that were copied.
foreach (string f in txtList)
{
File.Delete(f);
}
foreach (string f in picList)
{
File.Delete(f);
}
}
catch (DirectoryNotFoundException dirNotFound)
{
Console.WriteLine(dirNotFound.Message);
}
class Program
{
static void Main(string[] args)
{
// Specify the starting folder on the command line, or in
TraverseTree(ConfigurationManager.AppSettings["folderPath"]);
// Specify the starting folder on the command line, or in
// Visual Studio in the Project > Properties > Debug pane.
//TraverseTree(args[0]);
Console.WriteLine("Press any key");
Console.ReadKey();
}
public static void TraverseTree(string root)
{
if (string.IsNullOrWhiteSpace(root))
return;
// Data structure to hold names of subfolders to be
// examined for files.
Stack<string> dirs = new Stack<string>(20);
if (!System.IO.Directory.Exists(root))
{
return;
}
dirs.Push(root);
while (dirs.Count > 0)
{
string currentDir = dirs.Pop();
string[] subDirs;
try
{
subDirs = System.IO.Directory.GetDirectories(currentDir);
}
// An UnauthorizedAccessException exception will be thrown if we do not have
// discovery permission on a folder or file. It may or may not be acceptable
// to ignore the exception and continue enumerating the remaining files and
// folders. It is also possible (but unlikely) that a DirectoryNotFound exception
// will be raised. This will happen if currentDir has been deleted by
// another application or thread after our call to Directory.Exists. The
// choice of which exceptions to catch depends entirely on the specific task
// you are intending to perform and also on how much you know with certainty
// about the systems on which this code will run.
catch (UnauthorizedAccessException e)
{
Console.WriteLine(e.Message);
continue;
}
catch (System.IO.DirectoryNotFoundException e)
{
Console.WriteLine(e.Message);
continue;
}
IEnumerable<FileInfo> files = null;
try
{
//get only .bak file
var directory = new DirectoryInfo(currentDir);
DateTime date = DateTime.Now.AddDays(-15);
files = directory.GetFiles("*.bak").Where(file => file.CreationTime <= date);
}
catch (UnauthorizedAccessException e)
{
Console.WriteLine(e.Message);
continue;
}
catch (System.IO.DirectoryNotFoundException e)
{
Console.WriteLine(e.Message);
continue;
}
// Perform the required action on each file here.
// Modify this block to perform your required task.
foreach (FileInfo file in files)
{
try
{
// Perform whatever action is required in your scenario.
file.Delete();
Console.WriteLine("{0}: {1}, {2} was successfully deleted.", file.Name, file.Length, file.CreationTime);
}
catch (System.IO.FileNotFoundException e)
{
// If file was deleted by a separate application
// or thread since the call to TraverseTree()
// then just continue.
Console.WriteLine(e.Message);
continue;
}
}
// Push the subdirectories onto the stack for traversal.
// This could also be done before handing the files.
foreach (string str in subDirs)
dirs.Push(str);
}
}
}
类程序
{
静态void Main（字符串[]参数）
{
//在命令行或中指定起始文件夹
TraverseTree（ConfigurationManager.AppSettings[“folderPath”]）；
//在命令行或中指定起始文件夹
//项目>属性>调试窗格中的Visual Studio。
//TraverseTree（args[0]）；
Console.WriteLine（“按任意键”）；
Console.ReadKey（）；
}
公共静态void TraverseTree（字符串根）
{
if（string.IsNullOrWhiteSpace（根））
返回；
//用于保存要删除的子文件夹名称的数据结构
//检查文件。
堆栈dirs=新堆栈（20）；
如果（！System.IO.Directory.Exists（root））
{
返回；
}
直接推力（根）；
而（dirs.Count>0）
{
字符串currentDir=dirs.Pop（）；
字符串[]子字段；
尝试
{
subDirs=System.IO.Directory.GetDirectories（currentDir）；
}
//如果没有，将引发UnauthorizedAccessException异常
//文件夹或文件的发现权限。该权限可能不可接受，也可能不可接受
//忽略异常并继续枚举其余文件和
//DirectoryNotFound异常也是可能的（但不太可能）
//将引发。如果currentDir已被删除，则会发生这种情况
//在我们调用Directory.Exists之后，存在另一个应用程序或线程
//捕获哪些异常的选择完全取决于特定任务
//你打算表演，也取决于你确定知道多少
//关于将在其上运行此代码的系统。
捕获（未经授权的访问例外）
{
控制台写入线（e.Message）；
继续；
}
捕获（System.IO.DirectoryNotFounde异常）
{
控制台写入线（e.Message）；
继续；
}
IEnumerable files=null；
尝试
{
//仅获取.bak文件
var directory=newdirectoryinfo（currentDir）；
DateTime date=DateTime.Now.AddDays（-15）；
files=directory.GetFiles（“*.bak”）.Where（file=>file.CreationTime）在什么情况下会出现异常？它在哪一行出现异常？gridview 1.SelectedRow.Cells[0]。Text
对我来说很可疑。这一行是否从代码字符串中删除this=gridview 1.SelectedRow.Cells[0].Text；返回正确的文件路径？几乎所有NullReferenceException
的情况都相同。请参阅“”对于一些提示。SelectedRow不是一个集合，因此检查它是否为null将是一个更好的提示。在ASP.Net场景中…在删除之前先执行BP。这是ASP.Net场景，文件将不会被使用a时间也是@tammy你会说过程从提到的文件夹中删除文件，还是我必须添加路径？是的，如果我理解co正确地说，您必须将该路径添加到happen@jeremey是的，在我的情况下，它假设该文件不是当前使用的，但我同意
string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";
try
{
string[] picList = Directory.GetFiles(sourceDir, "*.jpg");
string[] txtList = Directory.GetFiles(sourceDir, "*.txt");
// Copy picture files.
foreach (string f in picList)
{
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
// Use the Path.Combine method to safely append the file name to the path.
// Will overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true);
}
// Copy text files.
foreach (string f in txtList)
{
// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
try
{
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName));
}
// Catch exception if the file was already copied.
catch (IOException copyError)
{
Console.WriteLine(copyError.Message);
}
}
// Delete source files that were copied.
foreach (string f in txtList)
{
File.Delete(f);
}
foreach (string f in picList)
{
File.Delete(f);
}
}
catch (DirectoryNotFoundException dirNotFound)
{
Console.WriteLine(dirNotFound.Message);
}
class Program
{
static void Main(string[] args)
{
// Specify the starting folder on the command line, or in
TraverseTree(ConfigurationManager.AppSettings["folderPath"]);
// Specify the starting folder on the command line, or in
// Visual Studio in the Project > Properties > Debug pane.
//TraverseTree(args[0]);
Console.WriteLine("Press any key");
Console.ReadKey();
}
public static void TraverseTree(string root)
{
if (string.IsNullOrWhiteSpace(root))
return;
// Data structure to hold names of subfolders to be
// examined for files.
Stack<string> dirs = new Stack<string>(20);
if (!System.IO.Directory.Exists(root))
{
return;
}
dirs.Push(root);
while (dirs.Count > 0)
{
string currentDir = dirs.Pop();
string[] subDirs;
try
{
subDirs = System.IO.Directory.GetDirectories(currentDir);
}
// An UnauthorizedAccessException exception will be thrown if we do not have
// discovery permission on a folder or file. It may or may not be acceptable
// to ignore the exception and continue enumerating the remaining files and
// folders. It is also possible (but unlikely) that a DirectoryNotFound exception
// will be raised. This will happen if currentDir has been deleted by
// another application or thread after our call to Directory.Exists. The
// choice of which exceptions to catch depends entirely on the specific task
// you are intending to perform and also on how much you know with certainty
// about the systems on which this code will run.
catch (UnauthorizedAccessException e)
{
Console.WriteLine(e.Message);
continue;
}
catch (System.IO.DirectoryNotFoundException e)
{
Console.WriteLine(e.Message);
continue;
}
IEnumerable<FileInfo> files = null;
try
{
//get only .bak file
var directory = new DirectoryInfo(currentDir);
DateTime date = DateTime.Now.AddDays(-15);
files = directory.GetFiles("*.bak").Where(file => file.CreationTime <= date);
}
catch (UnauthorizedAccessException e)
{
Console.WriteLine(e.Message);
continue;
}
catch (System.IO.DirectoryNotFoundException e)
{
Console.WriteLine(e.Message);
continue;
}
// Perform the required action on each file here.
// Modify this block to perform your required task.
foreach (FileInfo file in files)
{
try
{
// Perform whatever action is required in your scenario.
file.Delete();
Console.WriteLine("{0}: {1}, {2} was successfully deleted.", file.Name, file.Length, file.CreationTime);
}
catch (System.IO.FileNotFoundException e)
{
// If file was deleted by a separate application
// or thread since the call to TraverseTree()
// then just continue.
Console.WriteLine(e.Message);
continue;
}
}
// Push the subdirectories onto the stack for traversal.
// This could also be done before handing the files.
foreach (string str in subDirs)
dirs.Push(str);
}
}
}