尝试删除文件后如何确认文件正在使用中？

Question

Is there a way to know a file is in use, after attempting it to delete?

The DeleteFile() doesn't return any value to verify such scenario. is there any alternative that can be used to validate "an error message is thrown", if I tried to delete a file in use?

Answer 1

AFAIK, there is no explicit method in .NET.

You can, however, open and close the file with exclusive permissions and catch the error:

Public Function IsFileInUse(ByVal myFile As String) As Boolean
    If File.Exists(myFile) Then
        Try
            Dim hnd As Short = FreeFile()
            FileOpen(hnd, myFile, OpenMode.Binary, OpenAccess.ReadWrite, OpenShare.LockReadWrite)
            FileClose(hnd)
        Catch
            Return True
        End Try
    End If
End Function

Don't know what you are using (or what this has to do with javascript), so I posted this example without testing in VB.NET.