C# 2 forms and opacity question

问题

I have 2 forms. on the second form i have a track bar. Whenever that track bar changes it's value, I want form 1 to become transparent. My code.

opacitytrackBar1.ValueChanged += new EventHandler(opacitytrackBar1_ValueChanged);

but what is the code for setting form1's opacity? thanks!

回答1:

Are you after the .Opacity property on the form object? http://msdn.microsoft.com/en-us/library/system.windows.forms.form.opacity(v=VS.80).aspx

回答2:

Check this sites:

Fading Windows Form in C#

Transparency Tutorial with C# - Part 3

Transparent forms (form opacity)

Regards

来源：https://stackoverflow.com/questions/7250820/c-sharp-2-forms-and-opacity-question