ByVal在VB.NET中无法正常工作
我在VB.NET中有这样一个代码:ByVal在VB.NET中无法正常工作,vb.net,pass-by-value,Vb.net,Pass By Value,我在VB.NET中有这样一个代码: ' This code will sort array data Public Sub SelectionSort(ByVal array as ArrayList) For i as Integer = 0 To array.Count -1 Dim index = GetIndexMinData(array, i) Dim temp = array(i) array(i) = array(index)
' This code will sort array data
Public Sub SelectionSort(ByVal array as ArrayList)
For i as Integer = 0 To array.Count -1
Dim index = GetIndexMinData(array, i)
Dim temp = array(i)
array(i) = array(index)
array(index) = temp
Next
End Sub
Public Function GetIndexMinData(ByVal array As ArrayList, ByVal start As Integer) As Integer
Dim index As Integer
Dim check As Integer = maxVal
For i As Integer = start To Array.Count - 1
If array(i) <= check Then
index = i
check = array(i)
End If
Next
Return index
End Function
' This code will sort array data
Public Sub SelectionSortNewList(ByVal array As ArrayList)
Dim temp As New ArrayList
' Process selection and sort new list
For i As Integer = 0 To array.Count - 1
Dim index = GetIndexMinData(array, 0)
temp.Add(array(index))
array.RemoveAt(index)
Next
End Sub
Private Sub btnProcess_Click(sender As System.Object, e As System.EventArgs) Handles btnProcess.Click
Dim data as new ArrayList
data.Add(3)
data.Add(5)
data.Add(1)
SelectionSort(data)
SelectionSortNewList(data)
End Sub
”此代码将对数组数据进行排序
公共子选择排序(ByVal数组作为ArrayList)
对于数组,i为整数=0。计数-1
Dim index=GetIndexMinData(数组,i)
Dim temp=阵列(i)
数组(i)=数组(索引)
数组(索引)=温度
下一个
端接头
公共函数GetIndexMinData(ByVal数组作为ArrayList,ByVal开始作为Integer)作为Integer
将索引设置为整数
尺寸检查为整数=最大值
对于i As Integer=start To Array.Count-1
如果数组(i)即使在对象上使用ByVal
,也可以修改对象的属性
不能修改对象的实例,但不能修改其属性
例如:
Public Class Cars
Private _Make As String
Public Property Make() As String
Get
Return _Make
End Get
Set(ByVal value As String)
_Make = value
End Set
End Property
End Class
如果我以拜瓦尔的身份通过了这门课
Private sub Test(ByVal MyCar as Car)
MyCar.Make = "BMW"
End Sub
当您指向同一对象并修改其属性时,该属性的值将发生变化。为什么不使用该方法?其次,我选择了一个(在本例中为T=Integer)而不是一个ArrayList,因为它在编译时是类型安全的。最后,我建议研究值类型和引用类型之间的区别,了解它们的区别是非常重要的。