7-21 学习VB.net的笔记

Dim 声明关键字
& == +xx.ToString
‘ 或 // 都是为加注解

//定义一个函数
Private Function 方法名 As 返回数据类型
……….
End Funcation

//if … else
If 条件 Then …. Else End if

If …..ElseIf …ElseIf…Else …Endif

For……Next循环 如：
Dim intCount as Integer
For intCount=1 To 5
listData.Items.Add(“I’m item ”& intCount &”in the list”)
Next
二：
For intCount as Integer=4 To 62 Step 7
lstData.Items.Add(intCount)
Next
三：反向循环
For intCount As Integer=10 To 1 Step -1
lstData.Items.Add(intCount)
Next
四：ForEach 循环
For Each strFoler As String In _
My.Computer.FileSystem.GetDirectories("E:/")
lstDate.Items.Add(strFoler)
Next
五：Do Until Loop 循环
Dim objRandom As New Random()
Dim intRandomNumber As Integer = 0
lstDate.Items.Clear()
Do Until intRandomNumber = 10
intRandomNumber = objRandom.Next(25)
lstDate.Items.Add(intRandomNumber)
Loop
相对的Do While Loop
Dim objRandom As New Random()
Dim intRandomNumber As Integer = 0
lstDate.Items.Clear()
Do Until intRandomNumber <15
intRandomNumber = objRandom.Next(25)
lstDate.Items.Add(intRandomNumber)
Loop
提前结束循环
For Each strFoler As String In My.Computer.FileSystem.GetDirectories("E:/")
lstDate.Items.Add(strFoler)
If String.Compare(strFoler, "E:/HXH", True) = 0 Then
MessageBox.Show("循环提前结束", "提示")
Exit For
End If
Next
结束For Each循环是Exit For
结束Do Unit Loop，Do While Loop循环 是 Exit Do

Select Case 参数

.
.
Case Else