包含net.vb返回磁盘列表的词条
vb.net如何获取电脑中的所有盘符
首先使用 System.IO.DriveInfo.GetDrives()获取System.IO.DriveInfo，存入ds()
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然后遍历ds，获取各个信息部分。
Dim ds() As System.IO.DriveInfo = System.IO.DriveInfo.GetDrives()
For i As Integer = 0 To ds.Length - 1
TextBox1.Text = TextBox1.Text + ds(i).DriveType.ToString + " " '驱动器类型
TextBox1.Text = TextBox1.Text + ds(i).Name + " " '盘符（驱动器名）
TextBox1.Text = TextBox1.Text + ds(i).IsReady.ToString + " " '是否就绪
If ds(i).IsReady = True Then
TextBox1.Text = TextBox1.Text + ds(i).VolumeLabel + " " '卷标
TextBox1.Text = TextBox1.Text + ds(i).TotalSize.ToString + " " '驱动器容量
TextBox1.Text = TextBox1.Text + ds(i).TotalFreeSpace.ToString '驱动器可用容量
End If
TextBox1.Text = TextBox1.Text + vbNewLine
Next
vb.net 磁盘文件列表，界面如图，在.net下如何实现？
预先准备三个图标文件，用于树型控件中显示磁盘符号和文件夹的图像之用。
1、窗体上添加控件如下：
组合框控件 ComboBox1，树型控件 TreeView1，列表框控件 ListBox1，图像列表控件 ImageList1。
选中TreeView1，设置其ImageList属性为ImageList1。
2、设置属性
选中图像列表控件 ImageList1，在属性窗口里，选中属性Images，单击三个小点按钮，出现图像集合编辑器窗口，单击[添加按钮]，一一把准备好的图标文件进行添加，注意先后次序，如果不符合要求可以通过上下移动按钮重新改变次序。完成后单击[确定]。
运行图如下：
完整代码如下：
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'添加系统所有磁盘目录符号
For Each MyDrive As String In Environment.GetLogicalDrives()
ComboBox1.Items.Add(MyDrive)
Next
'显示第一个磁盘符号
ComboBox1.Text = ComboBox1.Items(0)
End Sub
'递归过程添加目录树
Public Sub AddDirectory(ByVal strFatherPath As String, ByVal strPath As String, ByVal nodeFather As TreeNode)
Dim i As Integer
Dim Mynode As New TreeNode
'先添加本目录
Mynode.Text = Strings.Replace(strPath, strFatherPath "\", "", , 1)
'为节点指定未被选中时显示的图标
Mynode.ImageIndex = 1
'为节点指定被选中时显示的图标
Mynode.SelectedImageIndex = 2
nodeFather.Nodes.Add(Mynode)
Application.DoEvents()
Try
Dim str() As String = Directory.GetDirectories(strPath)
'递归遍历该目录的子文件夹
For i = 0 To str.GetUpperBound(0)
AddDirectory(strPath, str(i), Mynode)
Next
Catch ex As Exception
Debug.WriteLine(ex.Message)
End Try
Mynode = Nothing
End Sub
'根据给出的盘符添加目录树
Private Sub AddRootDirectory(ByVal DiscSymbol As String)
Dim Nynode As New TreeNode
'先把磁盘盘符添加到树中
TreeView1.Nodes.Clear()
Nynode.ImageIndex = 0
Nynode.Text = DiscSymbol
Nynode.SelectedImageIndex = -1
TreeView1.Nodes.Add(Nynode)
Dim i As Integer
'获取磁盘根目录下的文件夹
Dim str() As String = Directory.GetDirectories(DiscSymbol "\")
For i = 0 To str.GetUpperBound(0)
'调用递归过程遍历该文件夹里的所有子文件夹，并添加到树型控件
AddDirectory(DiscSymbol, str(i), Nynode)
Next
Nynode = Nothing
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
'根据磁盘符号的变更，显示根目录里的文件
ListBox1.Items.Clear()
For Each MyFile As String In System.IO.Directory.GetFiles(ComboBox1.Text)
ListBox1.Items.Add(MyFile)
Next
'根据磁盘符号的变更，重新显示目录树
Dim DiscSymbol As String
DiscSymbol = Microsoft.VisualBasic.Left(ComboBox1.Text, Len(ComboBox1.Text) - 1)
Call AddRootDirectory(DiscSymbol)
End Sub
'递归过程根据子目录寻找上级目录名--从而构成完整的目录路径
Private Sub AllPath(ByVal ThisNode As TreeNode, ByRef MyPathName As String)
If ThisNode.Level 1 Then
'该节点层数大于1，其父节点不是磁盘根目录
MyPathName = ThisNode.Parent.Text "\" MyPathName
Dim MyNode As TreeNode = ThisNode.Parent
Call AllPath(MyNode, MyPathName)
Else
'该节点层数等于1，其父节点就是磁盘根目录
MyPathName = ComboBox1.Text MyPathName
End If
End Sub
Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
'为了搜索选中的节点对应目录的文件，需要组成全路径
Dim MyAllPathName As String = TreeView1.SelectedNode.Text
Dim MyNode As TreeNode = TreeView1.SelectedNode
If TreeView1.SelectedNode.Level = 0 Then
'如果选中的是根节点
MyAllPathName = ComboBox1.Text
Else
'如果选中的是非根节点，调用递归过程组成全路径
Call AllPath(MyNode, MyAllPathName)
MyAllPathName = MyAllPathName "\"
End If
'根据路径，搜索文件名并显示
ListBox1.Items.Clear()
For Each MyFile As String In System.IO.Directory.GetFiles(MyAllPathName)
ListBox1.Items.Add(MyFile)
Next
End Sub
End Class
VB.NET是如何使用ADO让存储过程返回数据表中的值呢？求解！
定义了连接和记录集后：
Dim res as new adodb.recordset
res.open "select * from Char1 where id=12",conn,3,3
do while res.eof=false
text1.text=res.fields("fName")
res.movenext
loop
res.close
VB.NET获取硬盘信息的几种方法
strResult += 磁盘类型: System.Convert.ToInt16(disk(DriveType).ToString())End IfMsgBox(strResult)NextEnd Sub总结：在VB.NET中，用API函数可以获取硬盘信息。原来熟悉API函数VB6程序员，可以对API函数声明进行适当的更改后，进行调用。利用FSO（文件系统对象）的Scrrun.DLL，也可以获得磁盘信息。在.net Framwork中，利用WMI可以获取更多的关于机器硬件的详细信息（参考System.Management命名空间）。
VB.NET 中使用 combobox 控件获取磁盘信息
先引用 System.ManageMent
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim HDDDeviceQuery As New Management.SelectQuery("Win32_DiskDrive")
Dim HDDDeviceSearch As New Management.ManagementObjectSearcher(HDDDeviceQuery)
Dim HDDDeviceInfo As Management.ManagementObject
For Each HDDDeviceInfo In HDDDeviceSearch.Get()
ComboBox1.Items.Add("HDD Description: " HDDDeviceInfo("caption").ToString())
ComboBox1.Items.Add("HDD BytesPerSector: " HDDDeviceInfo("BytesPerSector").ToString())
'ComboBox1.Items.Add("HDD CompressionMethod: " HDDDeviceInfo("CompressionMethod").ToString())
ComboBox1.Items.Add("HDD Index: " HDDDeviceInfo("Index").ToString())
'ComboBox1.Items.Add("HDD InstallDate: " HDDDeviceInfo("InstallDate").ToString())
ComboBox1.Items.Add("HDD Manufacturer: " HDDDeviceInfo("Manufacturer").ToString())
ComboBox1.Items.Add("HDD Partitions: " HDDDeviceInfo("Partitions").ToString() Space(1) GetLastDev())
ComboBox1.Items.Add("HDD Size: " Int(Val(HDDDeviceInfo("Size").ToString()) / 2 ^ 30) " GBytes")
ComboBox1.Items.Add("HDD TotalCylinders: " HDDDeviceInfo("TotalCylinders").ToString())
ComboBox1.Items.Add("HDD TotalSectors: " HDDDeviceInfo("TotalSectors").ToString())
ComboBox1.Items.Add("HDD TracksPerCylinder: " HDDDeviceInfo("TracksPerCylinder").ToString())
ComboBox1.Items.Add("HDD TotalHeads: " HDDDeviceInfo("TotalHeads").ToString())
ComboBox1.Items.Add("HDD TotalTracks: " HDDDeviceInfo("TotalTracks").ToString())
ComboBox1.Items.Add("HDD SectorsPerTrack: " HDDDeviceInfo("SectorsPerTrack").ToString())
ComboBox1.Items.Add("HDD SCSILogicalUnit: " HDDDeviceInfo("SCSILogicalUnit").ToString())
Next
End Sub
Public Function GetLastDev() As String
GetLastDev = ""
Dim r As Short = My.Computer.FileSystem.Drives.Count
For i As Short = 0 To r - 1 Step 1
GetLastDev = GetLastDev My.Computer.FileSystem.Drives(i).Name ":"
Next
Return GetLastDev
End Function
End Class
[求助]vb.net操作数据库得到返回值？
一个比较简单的方法是返回DataTable，代码如下：
public Boolean SearchBySQL(string SQL, DataTable myData)
{
SqlConnection myConn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
try
{
myConn.Open();
try
{
SqlCommand myComm = new SqlCommand(SQL, myConn);
SqlDataAdapter mySDA = new SqlDataAdapter();
mySDA.SelectCommand = myComm;
mySDA.Fill(myData);
return true;
}
catch (Exception ex)
{
return false;
}
}
catch (Exception ex)
{
return false;
}
finally
{
if (myConn.State == ConnectionState.Open)
{
myConn.Close();
}
}
}
其中ConnectionString是Web.config里的连接字符串
还有一种方法是写存储过程返回所需参数
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