有沒有朋友可以詳細解釋一下關于VB.NET里面的遞歸?最好有代碼加注釋,謝謝.

給你個例子希望可以幫到你

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遞歸系統目錄結構.

遞歸整個C盤目錄:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim iDir As IO.Directory

Dim node As New TreeNode

'先把C盤添加到樹中

TreeView1.Nodes.Clear()

node.ImageIndex = 0

node.Text = "本地磁盤 C:"

node.SelectedImageIndex = -1

TreeView1.Nodes.Add(node)

Dim i As Integer

'獲取C:盤根目錄下的文件夾

Dim str() As String = IO.Directory.GetDirectories("D:\")

For i = 0 To str.GetUpperBound(0)

'調用遍歷過程

AddDirectory("C:", str(i), node)

Next

node = Nothing

iDir = Nothing

End Sub

Public Sub AddDirectory(ByVal strFatherPath As String, ByVal strPath As String, ByVal nodeFather As TreeNode)

Dim iDir As IO.Directory

'Dim iDirInfo As IO.DirectoryInfo

Dim i As Integer

Dim node As New TreeNode

'先添加本目錄，從文件夾路徑分析出文件夾名稱

node.Text = Strings.Replace(strPath, strFatherPath "\", "", , 1)

'為單個節點指定節點未被選中時顯示的圖標

node.ImageIndex = 1

'為單個節點指定節點被選中時顯示的圖標

node.SelectedImageIndex = 2

nodeFather.Nodes.Add(node)

Application.DoEvents()

Try

Dim str() As String = IO.Directory.GetDirectories(strPath)

'遍歷該目錄的子文件夾

For i = 0 To str.GetUpperBound(0)

AddDirectory(strPath, str(i), node)

Next

Catch ex As Exception

Debug.WriteLine(ex.Message)

End Try

node = Nothing

iDir = Nothing

End Sub

vb.net 遞歸 vb.net 遞歸

這種不要用遞歸,知道關鍵字長度,知道節數用判斷就可以了,取前3位第一節,第二節取3個為父節點,取全部為第二節關鍵字,第三節取前6個為父節點,取全部為第三節關鍵字.

并沒有要求培養字段，查詢時從len(ID)=3*N，每次循環時N都+1

select * from tablename where len(id)=3

select case N

case 1

treeview.node.add id,name

case 2

treeview.node(left(id,3)).node.add id,name

case 3

treeview.node(left(id,3)).node(left(id,6)).add id,name

end select

查詢結果排個升序就不會存在這樣的問題了,你剛才說的那種,如果中間沒有比001001001001001更短的關鍵字,那么就脫節,這種是不可能添加到treeview中.

遞歸一般用在不知道節數,沒有關鍵字的情況,比如系統目錄結構.

遞歸整個C盤目錄:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim iDir As IO.Directory

Dim node As New TreeNode

'先把C盤添加到樹中

TreeView1.Nodes.Clear()

node.ImageIndex = 0

node.Text = "本地磁盤 C:"

node.SelectedImageIndex = -1

TreeView1.Nodes.Add(node)

Dim i As Integer

'獲取C:盤根目錄下的文件夾

Dim str() As String = IO.Directory.GetDirectories("D:\")

For i = 0 To str.GetUpperBound(0)

'調用遍歷過程

AddDirectory("C:", str(i), node)

Next

node = Nothing

iDir = Nothing

End Sub

Public Sub AddDirectory(ByVal strFatherPath As String, ByVal strPath As String, ByVal nodeFather As TreeNode)

Dim iDir As IO.Directory

'Dim iDirInfo As IO.DirectoryInfo

Dim i As Integer

Dim node As New TreeNode

'先添加本目錄，從文件夾路徑分析出文件夾名稱

node.Text = Strings.Replace(strPath, strFatherPath "\", "", , 1)

'為單個節點指定節點未被選中時顯示的圖標

node.ImageIndex = 1

'為單個節點指定節點被選中時顯示的圖標

node.SelectedImageIndex = 2

nodeFather.Nodes.Add(node)

Application.DoEvents()

Try

Dim str() As String = IO.Directory.GetDirectories(strPath)

'遍歷該目錄的子文件夾

For i = 0 To str.GetUpperBound(0)

AddDirectory(strPath, str(i), node)

Next

Catch ex As Exception

Debug.WriteLine(ex.Message)

End Try

node = Nothing

iDir = Nothing

End Sub

簡述vb.net過程的嵌套調用和遞歸調用

嵌套是指一個過程調用另一個過程的使用,遞歸過程是這個過程中調用本過程的使用。遞歸是嵌套的一種特殊形式，遞歸過程必須有“歸點”，也就是終止調用本身的一個分支