如何從另一個 class 引用控件的屬性？

Question

    Public Class Form1

    Private Sub FormLoad(sender As Object, e As EventArgs) Handles MyBase.Load

        Dim myClosed As Integer = 0
        Dim myProgress As Integer = 0
        Dim myReview As Integer = 0
        Dim myRejected As Integer = 0
        Dim myCompleted As Integer = 0
        Dim myImplemented As Integer = 0

        For Each item In MainWindow.DatabaseList.Items

            If item.Status = "Closed" Then
                myClosed += 1
            End If

            If item.Status = "In Progress" Then
                myProgress += 1
            End If

            If item.Status = "In Review" Then
                myReview += 1
            End If

            If item.Status = "Rejected" Then
                myRejected += 1
            End If

            If item.Status = "Completed" Then
                myCompleted += 1
            End If

            If item.Status = "Implemented" Then
                myImplemented += 1
            End If

        Next

        ClosedNr.Text = myClosed
        ProgressNr.Text = myProgress
        ReviewNr.Text = myReview
        RejectedNr.Text = myRejected
        CompletedNr.Text = myCompleted
        ImplementedNr.Text = myImplemented


    End Sub
End Class

當我嘗試引用 MainWindow class 時出現此錯誤。

Error   BC30469 Reference to a non-shared member requires an object reference.

我嘗試將 MainWindow FieldModifier 設置為 public，但它不能修復錯誤。

我也試過：

Dim myMainWindow as MainWindow = New MainWindow

但是這樣做時，我的 DatabaseList.Items.Count 返回 0。

項目是 VB.Net，但標記為 C# 因為我也可以在 C# 中編碼。

Answer 1

To get the ItemCollection from a WPF Window Class delivered to your WF Window Class you have to do the following:

1. 在您的 WF Window Class 中聲明一個新事件，如下所示：

   Public Sub New(ByVal items As ItemCollection)

   結束子

2. Go to the event in your WPF Window class that manages the WF Window Class and add the argument like this:

   Private Sub Dashboard_Click（發件人為 Object，e 為 RoutedEventArgs）

    Dim myWindow As Form1 = New Form1(DatabaseList.Items) myWindow.Show() End Sub

然后，您可以通過簡單的方式訪問 ItemCollection：

For Each item As myRow In items
    Next

感謝 Charles 和 zaggler 找到了解決方案。