Question

当我在“Visual Studio 2011 Ultimate 12”中按“开始”时，我正在工作，它说：

“InvalidOperationException未处理，调试器捕获到异常，并且用户设置指示应该发生中断。此线程在调用堆栈上仅使用外部代码帧停止。外部代码帧通常来自框架代码但可以还包括在目标进程中加载的其他优化模块。“

我的代码：

    Public Class Form1
    Private matrix As Integer(,) = PopulateMatrix()

    Private Sub ClickMouse(sender As Object, e As DataGridViewCellMouseEventArgs) Handles DataGridView.CellMouseClick
        MsgBox(e.Clicks & e.ColumnIndex & e.RowIndex)

        matrix(e.ColumnIndex, e.RowIndex) = 0

        Matrixtomatrixdef(matrix)
    End Sub

    Private Function PopulateMatrix() As Integer(,)  
        Dim matrix(10, 10) As Integer
        For rown = 0 To 9
            For columnn = 0 To 9
                matrix(columnn, rown) = 1
            Next
        Next
        Return matrix
    End Function

    Private Sub Matrixtomatrixdef(matrix As Integer(,))     
        Dim Matrixdef(10, 10) As Integer
        For rown = 0 To 9
            For columnn = 0 To 9
                Matrixdef(columnn, rown) = matrix(columnn, rown)
                Debug.Write(Matrixdef(columnn, rown).ToString & " ")
            Next
            Debug.WriteLine("")
        Next
    End Sub
End Class

Answer 1

因为您尝试将该函数作为类调用正在初始化，并且您无法执行此操作。声明变量，但稍后在构造函数或其他适当的位置设置它。

Private matrix As Integer(,)

Public Sub New() 'constructor
  matrix = PopulateMatrix
End Sub

Answer 2

您不能在同一个对象上调用方法作为字段定义的一部分。实例方法仅在初始化所有字段后可用。

Answer 3

正确的代码：

   Private matrix As Integer(,)
Private Sub populate1s(sender As Object, e As EventArgs) Handles Button3.Click
    matrix = PopulateMatrix()
End Sub

    Private Function PopulateMatrix() As Integer(,)
        Dim matrix(10, 10) As Integer
        For rown = 0 To 9
            For columnn = 0 To 9
                matrix(columnn, rown) = 1
            Next
        Next
        Return matrix
    End Function


Public Sub ClickMouse(sender As Object, e As DataGridViewCellMouseEventArgs) Handles LRInc.CellMouseClick
    matrix(e.ColumnIndex, e.RowIndex) = 0
    For rown = 0 To 9
        For columnn = 0 To 9
            Debug.Write(matrix(columnn, rown).ToString & " ")
        Next
        Debug.WriteLine("")
    Next
End Sub

当我将Matrix / Array声明为全局变量时，为什么会出现错误？

3 个答案: