在 VB 2008 中查找表单的实例

Question

Dim f as new frmNameHere  
f.show()

如何查找使用上述代码创建的 frmNameHere 的所有实例？

Answer 1

例如：

For i As Int32 = 1 To 10
   Dim frm As New frmNameHere()
   frm.Show()
Next
Dim openForms = Application.OpenForms.OfType(Of frmNameHere)()
While openForms.Any()
   openForms.First.Close()
End While

没有 linq 也可以工作，但是你必须遍历所有 OpenForms：

Dim forms As FormCollection = Application.OpenForms
For Each form As Form In forms
   If TypeOf form Is frmNameHere Then
      'do something with your frmNameHere-Form'
   End If
Next