vb.net 教程 4-2 目录操作 DirectoryInfo 4

本节谈谈如何获得某个目录下的子目录和文件，

当然，等到讲完了目录操作后，我将会举个类似于资源管理器的例子。

窗体设计界面如下：

列出子目录：

    Private Sub btnSubFolders_Click(sender As Object,e As EventArgs) Handles btnSubFolders.Click
        Dim di As New DirectoryInfo("c:\windows")
        If di.Exists = False Then Exit Sub
        txtFolderInfo.Text = ""
        For Each folderinfo As DirectoryInfo In di.GetDirectories
            txtFolderInfo.Text &= folderinfo.Name & ControlChars.CrLf
        Next
    End Sub

为简化操作，直接使用的Windows目录。

列出目录下的文件：

    Private Sub btnFiles_Click(sender As Object,e As EventArgs) Handles btnFiles.Click
        Dim di As New DirectoryInfo("c:\windows")
        If di.Exists = False Then Exit Sub
        txtFolderInfo.Text = ""
        For Each finfo As FileInfo In di.GetFiles
            txtFolderInfo.Text &= finfo.Name & ControlChars.CrLf
        Next
    End Sub

提前用了点FileInfo的知识。

列出所有：

    Private Sub Button1_Click(sender As Object,e As EventArgs) Handles Button1.Click
        Dim di As New DirectoryInfo("c:\windows")
        If di.Exists = False Then Exit Sub

        Dim fsType As String
        txtFolderInfo.Text = ""
        For Each fsinfo As FileSystemInfo In di.GetFileSystemInfos
            If (fsinfo.Attributes And FileAttribute.Directory) = FileAttribute.Directory Then fsType = "目录" Else fsType = "文件"
            txtFolderInfo.Text &= fsType & " " & fsinfo.Name & ControlChars.CrLf
        Next
    End Sub

其实，DirectoryInfo和FileInfo都是继承于FileSystemInfo，很多属性和方法都来自FileSystemInfo。

运行时如图：

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