I’ve been using a little class for years to make Windows Forms fade in and out using the built-in OS features. This makes it far more powerful than just playing with the opacity. Using it is also very easy as it is a self contained class that already inherits from System.Windows.Forms.Form. This means all you have to do to use it is inherit from it and everything else is done for you already.<\/p>\n
using <\/span>System;
\nusing <\/span>System.Runtime.InteropServices;
\nusing <\/span>System.Windows.Forms;<\/p>\nnamespace <\/span>HenIT.Windows.Forms
\n{<\/p>\npublic class<\/span> FadeForm : Form<\/span>
\n{<\/p>\n#region Constants<\/span>
\nconst int <\/span>AW_HIDE = 0X10000;
\nconst int <\/span>AW_ACTIVATE = 0X20000;
\nconst int<\/span> AW_HOR_POSITIVE = 0X1;
\nconst int<\/span> AW_HOR_NEGATIVE = 0X2;
\nconst int<\/span> AW_SLIDE = 0X40000;
\nconst int<\/span> AW_BLEND = 0X80000;
\nconst int<\/span> FADEINTIMEMS = 500;
\nconst int<\/span> FADEOUTMS = 250;
\n #endregion<\/span><\/p>\n[DllImport<\/span>(“user32.dll”, CharSet = CharSet<\/span>.Auto)]
\nprivate static extern int <\/span>AnimateWindow
\n(IntPtr <\/span>hwand, int <\/span>dwTime, int <\/span>dwFlags);<\/p>\nprivate bool<\/span> _UseSlideAnimation;
\npublic <\/span>FadeForm() : this<\/span>(false<\/span>) { }
\npublic <\/span>FadeForm(bool <\/span>useSlideAnimation)
\n{<\/p>\n_UseSlideAnimation = useSlideAnimation;<\/p>\n
}<\/p>\n
#region Overrides<\/span>
\n protected override void<\/span> OnLoad(EventArgs <\/span>e)
\n{<\/p>\nbase<\/span>.OnLoad(e);
\nAnimateWindow(this<\/span>.Handle, FADEINTIMEMS, AW_ACTIVATE | (_UseSlideAnimation ?
\nAW_HOR_POSITIVE | AW_SLIDE : AW_BLEND));
\nthis<\/span>.Refresh();<\/p>\n}<\/p>\n
protected override void<\/span> OnClosing(System.ComponentModel.CancelEventArgs <\/span>e)
\n{<\/p>\nbase<\/span>.OnClosing(e);
\nif <\/span>(e.Cancel == false<\/span>)
\n{<\/p>\nAnimateWindow(this.Handle, FADEOUTMS, AW_HIDE | (_UseSlideAnimation ?
\nAW_HOR_NEGATIVE | AW_SLIDE : AW_BLEND));<\/p>\n}<\/p>\n
}<\/p>\n
#endregion<\/span><\/p>\n
}<\/p>\n
}<\/p><\/blockquote>\n
And that is it!<\/p>\n","protected":false},"excerpt":{"rendered":"
I’ve been using a little class for years to make Windows Forms fade in and out using the built-in OS features. This makes it far more powerful than just playing with the opacity. Using it is also very easy as …<\/p>\n