如何使用asp.net從文件夾中刪除特定文件

Question

這里的交易我得到了一個datagridviewer，它被稱為gridview1和fileupload1，當我上傳文件時，它用文件名和路徑更新gridview1和數據庫中的表，並將所述文件存儲在文件夾“Mag”中......但是現在是什么我想要做的是反過來我得到了如何使用gridview刪除表條目但刪除文件夾“Mag”無法正常使用C＃中的以下代碼或代碼隱藏

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);
        }
    }
}

它給了我錯誤

“你調用的對象是空的。”

請告訴我，我做錯了什么是新的，不必深入了解平台所以任何和所有的幫助將不勝感激提前感謝馬克

這是我找到的答案感謝Tammy和其他所有人的答案

好的，交易目標函數從gridview和數據庫表中刪除文件詳細信息，並從存儲文件的項目文件夾中刪除文件

在gridview的腳本部分，你想要包括

OnRowDeleting="FuntionName"

不

OnSelectedIndexChanged = "FuntionName"

要么

OnRowDeleted="FuntionName"

然后在C＃代碼（代碼隱藏）

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);
       }

     }
  }

只是為那些想要學習的人提供了額外的參考

OnRowDeleting =“FuntionName”就是在刪除行之前你可以取消刪除或運行數據上的函數，就像我做的那樣

OnRowDeleted =“FuntionName”它直接刪除

Answer 1

這是我刪除文件的方式

if ((System.IO.File.Exists(fileName)))
                {
                    System.IO.File.Delete(fileName);
}

還要確保您在刪除時傳遞的文件名是准確的路徑

編輯

您也可以使用以下事件，或者只使用此代碼段中的代碼並在您的方法中使用

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);

     }
  }

Answer 2

檢查GridView1.SelectedRow不為null：

if (GridView1.SelectedRow == null) return;
string DeleteThis = GridView1.SelectedRow.Cells[0].Text;

Answer 3

在我的項目中，我正在使用ajax，我在我的代碼中創建了一個web方法，就像這樣

在前

 $("#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();
        });  

在代碼背后

        [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));
            }
        }

我想這會對你有所幫助。

Answer 4

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);
}

Answer 5

從路徑中刪除任何或特定的文件類型（例如“.bak”）。 見下面的演示代碼 -

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);
                }
            }
        }

更多參考 - https://msdn.microsoft.com/en-us/library/bb513869.aspx