Question

我尝试在一个类下编写“公共属性流（NumCommodities - 1）As Double”，但显然它需要额外的编码。

所以我需要这个属性，因为我需要根据这段代码跟踪值：

For t As Integer = 0 To MyProblem.Arcs.Count-1
    For k = 0 To MyProblem.NumCommodities-1
        Dim i As Integer = MyProblem.Arcs(t).Tail
        Dim j As Integer = MyProblem.Arcs(t).Head
        Dim akey As String = "x(" & i & "," & j & "," & k & ")“
        Dim aid As Integer = solver.GetIndexFromKey(akey)
        MyProblem.Arcs(t).Flow(k) = solver.GetValue(aid).ToDouble
    Next
Next

OBS：我已经在MyProblem Class

下声明了这个

Public Class MyProblem
    Public NumCommodities

Answer 1

您无法使用可变大小声明和数组。相反，你必须声明然后初始化它。

Public Property Flow As Double() = New Double(NumCommodities - 1) {}

请注意，如果NumCommodities - 1为否定或者NumCommodities尚未实例化，则会失败。

由于您的问题没有提供对该问题的大量见解，您可能还在尝试声明访问数组项的属性。以下是如何实现这样的事情：

Private _Flow As Double() = New Double() {}
Public Property Flow(ByVal NumCommodities As Int32) As Double
    Get
        Return _Flow(NumCommodities - 1)
    End Get
    Set(value As Double)
        _Flow(NumCommodities - 1) = value
    End Set
End Property

如何在类的VB.NET中编写“公共属性流（NumCommodities - 1）As Double”？

1 个答案: