CODEWITHSUNDEEP
.netvb.netwinforms
Devfly
Devfly

Reputation: 2495

User Controls hide and show

I have a couple of user controls, which I show in my main form.

So let's say here's what i want:

Sub Show_Control1()
UserControl1.Show
'CODE TO HIDE EVERY OTHER DISPLAYED USER CONTROL ON THE MAIN FORM
End sub

right now I have to hide them one by one with hide, because I don't know what's the current displayed form.

Upvotes: 0

Views: 5762

Answers (2)

Lzh
Lzh

Reputation: 3635

I tried your situation on a Windows Forms application (.NET 4) and the following worked. I'm not sure why your way of using GetType(T1) Is GetType(T2) isn't working (maybe it has different semantics, like it doesn't consider inheritance) but you can use this instead:

Sub Show1()
    For Each ctrl As Control In Controls
        If TypeOf ctrl Is UserControl Then
            ctrl.Hide()
        End If
    Next
    UserControl11.Show()
End Sub

Update:

I checked the MSDN to see why is your code not working. Firstly the TypeOf .. Is operator is the one used to check for whether a type of an object is compatible with another. Here's what they MSDN article at (Link: TypeOf keyword) says:

The TypeOf keyword introduces a comparison clause that tests whether an object is derived from or implements a particular type, such as an interface.

However you're using the Is keyword (very different from that used in C# to check whether an object is of some particular type). The "Is" keyword is used to check whether two references reference the same object. Here's what MSDN at (Link: Is keyword) says:

[Is] Compares two object reference variables.

So I was right: you're using an operator with different semantics than your intentions. I rarely write VB .NET code these days. Nice question.

Upvotes: 1

user932887
user932887

Reputation:

Give this a try:

Sub Show_Control1()
For Each cont In Me.Controls
    cont.Hide
Next cont
UserControl1.Show
End sub

This will basically hide all controls, and then show just the one you want. Faster and simpler than checking on each control if it's not the one you want to stay visible.

Upvotes: 0

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