[學習 ] 列舉表單上所有的控制項 列舉開啟的所有表單

當想一次完成某些控制項的(屬性)設定時。
        For Each Control As Windows.Forms.Control In Me.Controls
            If Control.GetType Is GetType(Button) Then
                Control.Enabled = False
                Control.Width = 200
            End If
        Next

        For Each Control As Windows.Forms.Control In Me.Controls
            If Control.GetType Is GetType(TextBox) Then
                Control.Enabled = False
                Control.Width = 200
            End If
        Next
,etc...

當想取得目前程式中所有被開啟的表單集合時。
        For Each frm As Form In My.Application.OpenForms
            MsgBox(frm.Name & "," & frm.Text)
        Next

之後就可以做你想做的運用了...
存取每個表單上的全域物件(或變數)。
ex:
if frm.Name = "form1" then .....
,etc...

備註：
如果某Control是停駐於另一個Control下
則用此方法會找不到
ex：TextBox1 停駐於 GroupBox1 下...
此時的方法只會顯示(查詢到) GroupBox
可參考 方法 或 更好的方法(待查)
[ASP.NET] 透析FindControl

參考：
[技巧] Controls.Find - 驗證篇

List Of ALL Controls In PROJECT - VB.Net
How to find all child controls from a starting control or form
Foreach Control in form, all the TextBoxes
How to recursively get all controls on a form in C#
How to get ALL child controls of a Windows Forms form
Foreach Every Control on all forms

你有用 FindControl 時找不到 Control (控制項) 的經驗嗎

How to get ALL child controls of a Windows Forms form of a specific type (Button/Textbox)?