该进程无法访问该文件，因为该文件正在被另一个进程使用

发布于 2024-09-29 14:23:09 字数 1308 浏览 6 评论 0原文

我通过以下代码将图像添加到 FlowLayoutPanel 控件中。

Dim WithEvents Pedit As DevExpress.XtraEditors.PictureEdit

Private Sub LoadImagesCommon(ByVal fi As FileInfo)
        Pedit = New DevExpress.XtraEditors.PictureEdit
        Pedit.Width = 133
        Pedit.Height = 98
        Pedit.Image = Image.FromFile(fi.FullName)
        Pedit.Properties.SizeMode = DevExpress.XtraEditors.Controls.PictureSizeMode.Zoom
        Pedit.ToolTip = fi.Name
        AddHandler Pedit.MouseClick, AddressOf Pedit_MouseClick
        AddHandler Pedit.MouseEnter, AddressOf Pedit_MouseEnter
        AddHandler Pedit.MouseLeave, AddressOf Pedit_MouseLeave
        FlowLayoutPanel1.Controls.Add(Pedit)
    End Sub

问题是，当我尝试删除我在上一步中加载的图像。

                    FlowLayoutPanel1.Controls.Clear()
                    FlowLayoutPanel1.Refresh()
                    For Each fi As FileInfo In New DirectoryInfo(My.Settings.TempDirectory).GetFiles
                        RemoveHandler Pedit.MouseClick, AddressOf Pedit_MouseClick
                        RemoveHandler Pedit.MouseEnter, AddressOf Pedit_MouseEnter
                        RemoveHandler Pedit.MouseLeave, AddressOf Pedit_MouseLeave
                        File.Delete(fi.FullName)
                    Next

那么我在这里做错了什么？

原文

I am adding images to a FlowLayoutPanel control via the following code

Dim WithEvents Pedit As DevExpress.XtraEditors.PictureEdit

Private Sub LoadImagesCommon(ByVal fi As FileInfo)
        Pedit = New DevExpress.XtraEditors.PictureEdit
        Pedit.Width = 133
        Pedit.Height = 98
        Pedit.Image = Image.FromFile(fi.FullName)
        Pedit.Properties.SizeMode = DevExpress.XtraEditors.Controls.PictureSizeMode.Zoom
        Pedit.ToolTip = fi.Name
        AddHandler Pedit.MouseClick, AddressOf Pedit_MouseClick
        AddHandler Pedit.MouseEnter, AddressOf Pedit_MouseEnter
        AddHandler Pedit.MouseLeave, AddressOf Pedit_MouseLeave
        FlowLayoutPanel1.Controls.Add(Pedit)
    End Sub

The problem is that i get the following error The process cannot access the file xxxx because it is being used by another process. when i try to delete the images that i loaded on the previous step.

                    FlowLayoutPanel1.Controls.Clear()
                    FlowLayoutPanel1.Refresh()
                    For Each fi As FileInfo In New DirectoryInfo(My.Settings.TempDirectory).GetFiles
                        RemoveHandler Pedit.MouseClick, AddressOf Pedit_MouseClick
                        RemoveHandler Pedit.MouseEnter, AddressOf Pedit_MouseEnter
                        RemoveHandler Pedit.MouseLeave, AddressOf Pedit_MouseLeave
                        File.Delete(fi.FullName)
                    Next

So what am i doing wrong here?

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情痴 2024-10-06 14:23:09

Image.FromFile 实际上锁定了它加载的文件并且只有在释放锁后才释放锁。

解决方案是将图像绘制到另一个图像的图形上下文中（从而有效地复制它）并处理原始图像。

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梦境 2024-10-06 14:23:09

啊哈！谢谢康拉德。

经过一番阅读后，我也找到了另一种解决方法。

Dim fs As System.IO.FileStream
fs = New System.IO.FileStream(fi.FullName, IO.FileMode.Open, IO.FileAccess.Read)
Pedit.Image = System.Drawing.Image.FromStream(fs)
fs.Close()

更新：
这是康拉德的建议。对于所有新手来说，就像我一样:)

 Dim imgTemp As System.Drawing.Image  
 imgTemp = System.Drawing.Image.FromFile(strFilename, True)  
 Pedit.Image = New System.Drawing.Bitmap(imgTemp)  
 imgTemp.Dispose()  
 Pedit.Image.Save(strFilename)

这更好，因为在 FileStream 关闭后 Image 对象无法调用其 Save 方法。

Aha! Thank you Konrad.

after some reading, i found another workaround too.

Dim fs As System.IO.FileStream
fs = New System.IO.FileStream(fi.FullName, IO.FileMode.Open, IO.FileAccess.Read)
Pedit.Image = System.Drawing.Image.FromStream(fs)
fs.Close()

Update:
and here is what Konrad suggested. For all the newbies out there, just like me :)

 Dim imgTemp As System.Drawing.Image  
 imgTemp = System.Drawing.Image.FromFile(strFilename, True)  
 Pedit.Image = New System.Drawing.Bitmap(imgTemp)  
 imgTemp.Dispose()  
 Pedit.Image.Save(strFilename)

which is better since the Image object cannot have its Save method called after the FileStream has been closed.

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