如何检查文本文件是否打开并关闭文本文件? [英] How to check if the text file is open and close the text file?

问题描述

我试图将文本文件保存在此路径中:C:\Test\test.txt"，当文件已经打开时，我需要检查文件是否已打开，在写入之前需要关闭它到文件.

I am trying to save the text file in this path:"C:\Test\test.txt" and when the file is already opened I need to check whether the file is opened and I need to close it before writing it to the file.

这是保存文件的代码:Dim myfile As String = "C:\Test\test.txt"

Here is the code for saving the file: Dim myfile As String = "C:\Test\test.txt"

    'Check if file exists
    If System.IO.File.Exists(myfile) = True Then
        'Delete it!

        Dim fi As New FileInfo(myfile)
        fi.Delete()
    End If



    Using sfdlg As New Windows.Forms.SaveFileDialog
        sfdlg.DefaultExt = "amk"
        sfdlg.Filter = "AquaMark Project|*.amk"
        If sfdlg.ShowDialog = Windows.Forms.DialogResult.OK Then


            Dim SaveData As New gCanvasData


            IO.Directory.CreateDirectory("C:\Test")
            Dim w As New IO.StreamWriter("C:\Test\test.txt")
            Dim i As Integer


            For i = 0 To CheckedListBox1.Items.Count - 1
                w.WriteLine(CheckedListBox1.Items.Item(i))
            Next
            w.Close()
            With SaveData
                frmDisplay.GCanvas1.UnselectCurrentAnotate()
                .gAnnotates = frmDisplay.GCanvas1.gAnnotates
                .Image = frmDisplay.GCanvas1.Image
            End With

            Using objStreamWriter As New StreamWriter(sfdlg.FileName)
                Dim x As New XmlSerializer(GetType(gCanvasData))
                x.Serialize(objStreamWriter, SaveData)
                objStreamWriter.Close()
            End Using
        End If
    End Using

如果我这样做，我可以关闭记事本进程，但我需要关闭特定打开的文本文件:

If I am doing this way I am able to close the notepad process but I need to close the specific opened text file:

Dim Process() As Process = System.Diagnostics.Process.GetProcessesByName("notepad")
Process() = CType(Interaction.GetObject("C:\Test\test.txt"), Diagnostics.Process())
For Each p As Process In Process
    p.Kill()
Next 

推荐答案

我不相信有一种属性可以让您检查流阅读器是否打开.

I do not believe there is a property that will allow for you to check if the streamreader is open or not.

最佳实践似乎是在阅读器完成后.close.(都在使用它的方法中.)

Best practice seems to be to .close the reader when done with it. (All in the method that it was used in.)

如果您仍然遇到异常，您可以尝试使用 try 块 来处理异常.

You could try a try block to handle the exception if you are still getting one.

也许可以在这里找到更多信息和一些示例代码.祝你好运.

May be able to find additional info and some sample code here. Good Luck.

MSDN！流阅读器

您可以使用它进行检查.IO.File

You may be able to check using this. IO.File

Private Function CheckFile(ByVal filename As String) As Boolean

    Try
        System.IO.File.Open(filename, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.None)
        FileClose(1)
        Return False
    Catch ex As Exception
        Return True
    End Try

End Function

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