Size of UserControl by Constructor

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Perhaps the title is not very good - therefore I try to explain my "problem" :
I often create my own Controls and/or UserControls.
All of my Control are scalable.
In some of my UserControls I set the Size-Property in the Constructor-Script (New) after the InitializeComponents-Call to a fixed value (for example Mybase.size = new size (150,30)). This setting is completly ignored when I put the Control to a Form (for example). After putting it on a Form it is all times possible to resize the Control and this setting is also stored in the Designer-Script of the Form (or in a Container-Control).

Where do I make the mistake ?

Posted 4-May-15 8:22am

Ralf Meier

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Sergey Alexandrovich Kryukov 4-May-15 15:42pm

First, which UserControl? System.Windows.Controls.UserControl, System.Windows.Forms.UserControl, System.Web.UI.UserControl? Anything else?
Always provide full type name, at least once.
—SA

Ralf Meier 4-May-15 16:01pm

It is a System.Windows.Forms.UserControl ...

Sergey Alexandrovich Kryukov 4-May-15 17:39pm

Then my Solution 2 will fork for you. I updated it with the code sample.
Will you accept the solution formally now.
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-05-04T09:45:00

Your question is ambiguous. I need an exact full type name to give an exact answer. However, chances are, the solution is: Size (or Width and Height) is not enough and is not even required. You can prescribe fixed size by setting the properties MinimumSize and MaximumSize to the same constant value.

[EDIT: After clarification]

All right, this is the class System.Windows.Forms.UserControl:
https://msdn.microsoft.com/en-us/library/system.windows.forms.usercontrol%28v=vs.110%29.aspx[^].

Do this, for example:

C#

public class MyClass : UserControl {

    public MyClass {
        defaultSize = //... setup some fixed size
    }
    
    protected virtual Size DefaultMaximumSize {
        get { return this.defaultSize; }
    }
    protected virtual Size DefaultMinimumSize {
        get { return this.defaultSize; }
    }

    Size defaultSize;

    // ...
    
}

—SA

OriginalGriff · Answer 2 · 2015-05-04T08:36:00

Solution 1

The chances are it's being overwritten in the InitializeComponent method of the parent control - in this case the Form that holds the UserControl - if you look at the form Designer code you will almost certainly see it setting the Size property of your UserControl.

You could hide the Size property by creating a new Size with Shadows[^] in the declaration to make the "genuine" Base.Size property only visible from within the class.

Posted 4-May-15 8:36am

OriginalGriff

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Ralf Meier 4-May-15 16:00pm

You are quiet right - I tried it by myself with this solution and I know, that it works. But I can't understand why my first try not works.
When I walk through the new script then first the 'InitializeComponent' is called. After this I set the Size-Property to the value I wish (which is completely ignored).
When I put the Control on a Form it generates a Size-value which doesn't compare to the original Control-Size (when I designed the control) and also it doesn't compare to the wished value - but everytime it has the same value - wherever it comes ...

OriginalGriff 4-May-15 16:13pm

Because it's down to *when* the InitialiseComponent method is called for your control and for the form that contains it. Because your control is a part of the form, it's constructor is called before the constructor for the form itself, which means that your setting of Size is overwritten by the setting from the form - as you'd expect in normal circumstances.

Try adding Console.WriteLine to see the order of execution and you'll see what I mean.