如何从ASP.NET中的目录中删除文件？ [英] How to Delete Files from Directory in ASP.NET ?

问题描述

我已将一些图片上传到fol 使用上传选项并在
gridview 上显示同一页。 

我有另一个按钮'删除'。我希望在删除按钮时删除在gridview中选中的复选框。

按下删除按钮后我尝试了以下代码，但是不工作。

 protected void CarImgDelBtn_Click（object sender，EventArgs e）
 {
 GridViewRow row = Carimgdispgrdview.SelectedRow; 
 
 string filename = row.Cells [0] .Text; 
 
 if（filename！= null || filename！= string.Empty）
 {
 if（（System.IO.File.Exists（filename）））
 System.IO.File.Delete（filename）; 
 
} 
 
} 
 

解决方案

确保文件名包含完整路径（包括磁盘和目录）。要构建路径，可能应该使用与上载操作类似的技术（可能是
Server.MapPath ）。然后将"||"替换为"&&"或试试这个：

  if（！string.IsNullOrEmpty（filename））

  {

    string full_path =构建完整路径...

    File.Delete（full_path）;

  }

您可能也对检测所选复选框感兴趣。这里可以询问与ASP相关的具体问题：
https://forums.asp.net 。似乎你可以为每一行使用一个循环，并且
FindControl ：
https://www.asp.net/web-forms/overview/data-access/enhancing-the-gridview /添加-A-gridview的柱 - 的-复选框-CS 。

Hi,

I have uploaded some images to a folder using Upload option and displayed them in gridview on the same page. 

I have another button 'Delete'. I want that checkbox selected in gridview gets deleted when I press Delete button.

I have tried the following code after pressing delete button, but is not working.

    protected void CarImgDelBtn_Click(object sender, EventArgs e)
    {
        GridViewRow row = Carimgdispgrdview.SelectedRow;

        string filename = row.Cells[0].Text;

        if(filename != null || filename != string.Empty)
        {
            if ((System.IO.File.Exists(filename)))
                System.IO.File.Delete(filename);

        }
            
    }

解决方案

Make sure that filename contains a full path (including disk and directories). To build the path, probably you should use a similar technique as in your Upload operations (maybe Server.MapPath). Then replace "||" with "&&" or try this:

  if( ! string.IsNullOrEmpty( filename))
  {
    string full_path = build the full path…
    File.Delete( full_path);
  }

You probably are also interested in detecting the selected checkboxes. Such specific questions related to ASP can be asked here: https://forums.asp.net. Seems that you can use a loop for each row, and FindControl: https://www.asp.net/web-forms/overview/data-access/enhancing-the-gridview/adding-a-gridview-column-of-checkboxes-cs.

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