动态更改按钮大小

Question

I'm using .NET CF with Visual Studio 2008.

In autogenerated Form.Designer.cs there is following code to specify button dimensions:

this.buttonX.Size = new System.Drawing.Size(96, 24);

But when I use even the same code in my constructor dimensions "freak out" and button is much smaller.

public FormX()
{
    InitializeComponent();
    this.buttonX.Size = new System.Drawing.Size(96, 24);
}

As seen on screenshots, left side works fine and on the right side I changed the dimensions from my constructor and the button is smaller...

EDIT: Just to clarify, button is created in designer view, and i'd like to change the button size(just size) dynamically afterwards.

Answer 1

The problem is caused by AutoScaling. Your development machine has different DPI settings than your device. In the generated code, the development DPI settings are actually stored, and this is used to scale the height and width of your controls via a comparison to the device DPI.

See https://msdn.microsoft.com/en-us/library/system.windows.forms.autoscalemode(v=vs.90).aspx for more information, plus there are a lot of articles on this topic as well.

You can change the AutoScaleMode and manage all the sizes yourself like shown here ( How to make compact framework custom controls AutoScale aware ), or you can apply the same size adjustments the framework is doing when you manually adjust your control sizes.

---

If the control already exists and you are just trying to adjust its size, you can still scale the size yourself, similiar to what was done in some of the linked articles.

Something like this (free-0hand, not syntax-checked):

SizeF scale = this.AutoScaleFactor;
Size desiredSize = new Size(96, 24);
SizeF calculatedSize = new SizeF(desiredSize.Width * scale.Width, desiredSize.Height * scale.Height);
this.buttonX.Size = calculatedSize.ToSize();