We Keep Coding

Label animation on data change

I need to change to background color animation of a label based on the value of an integer.
MyInt = 1 then label1.background color = Red
MyInt = 2 then label1.background color = Green
MyInt = 3 then label1.background color = Yellow
Can somebody point me in the right direction as I’m completely new to WPF.
Many Thanks

You can use DataTriggers to change properties based on a bound value. The easiest way would be to add a style to your label.

How brush convert to color (UWP)?

I have convert "Windows.UI.Xaml.Media.Brush" to "Windows.UI.Color". But VS return error. Tell me please how can I do this conversion correctly?

You cannot convert a brush to a color. The concept of a brush cannot be reduced to a color, as it could be a gradient of colors, or an image etc.
The conversion only makes sense for the special case of SolidColorBrush. I am guessing that's what you are after. Here is how you do it in code:
Windows.UI.Color colorFromBrush;
if (brush is SolidColorBrush)
colorFromBrush = (brush as SolidColorBrush).Color;
else
throw new Exception("Can't get color from a brush that is not a SolidColorBrush");
Thanks,
Stefan Wick - Windows Developer Platform

You can convert Brush to color, but you have to write it explicitly.
To do so just do this:
StackPanel pane = new StackPanel()
{
Background = Background = new SolidColorBrush(new Windows.UI.Color() { A = 255, R = 25, B = 0, G = 0})
}
This works for EVERY single UIElement as long as you assign the Background property properly.

There is a workaround if you're converting it to a string, then the string to bytes and then the bytes to color:
var brushString = Foreground.ToString(); // brushString equals "#FF000000" (in case of black brush)
var brushWithoutHash = brushString.Substring(1); // brushWithoutHash equals "FF000000"
var color = Color.FromArgb(Convert.ToByte(brushWithoutHash.Substring(0, 2), 16), Convert.ToByte(brushWithoutHash.Substring(2, 2), 16), Convert.ToByte(brushWithoutHash.Substring(4, 2), 16), Convert.ToByte(brushWithoutHash.Substring(6, 2), 16));
in the last line you take the hexadecimal string values and convert them to a byte.
Make sure that you're brush is made out of one single color and not null, otherwise you'll get an exception.

Setting Color Using Number in C#

I can set a colors to object using Brush as follows:
Brushes.Red
How to apply the same using numbers,
say,
SetColor("#ffffff");
The above is an imaginary example.

You can use ColorTranslator.FromHtml
EDIT - In response to your comment, you can create a brush based on your colour:
SolidBrush brush = new SolidBrush(ColorTranslator.FromHtml("#ffffff"));

You can make Brushes with your own Color:
Color col = Color.FromArgb(255, 255, 255);
SolidBrush br = new SolidBrush(col);
Hope that helps.

In WPF:
var x = (Color)ColorConverter.ConvertFromString("#faffff");

Color color = Color.FromRgb(255, 255, 255);
i assume you know how to calculate the values?

I think you are looking for the Color.FromArgb method. It has an overload that allows specifying the color as an integer number.

Color c = (Color)((new ColorConverter()).ConvertFromString("#ffffff"));

C# color value from name

I need to get the RGB value of a color given it's name in C#. I am trying to use the predefined KnownColors enum, but can't figure out how to get the value.
Any help?
Thank you.

Use FromKnownColor:
Color blue = Color.FromKnownColor(KnownColor.Blue);
Then blue.R, blue.G and blue.B for the RGB values.
Or, if you just want the int value for the RGB color, you can do:
int blueRgb = Color.FromKnownColor(KnownColor.Blue).ToArgb();

The Color class has some interesting static methods:
Color.FromName ("Red").ToArgb()
Next to that, there are some properties like:
var c = Color.FromName ("Red"); // Or use Color.FromKnownColor (KnownColor.Red)
Console.WriteLine (String.Format ("RGB: {0} {1} {2}", c.R, c.G, c.B);

Use Color.FromKnownColor then access RGB values using Color.R, Color.G and Color.B.

Color clr = FromKnownColor(System.Drawing.KnownColor.Blue);
string.Format("R:{0}, G:{1}, B:{2}" clr.R, clr.G, clr.B);
Check this Out

enter code hereYou could do
int r = Color.FromName("Purple").ToArgb();
//Or
int r1 = Color.FromKnownColor(KnownColor.Purple).ToArgb();
Color.FromName and Color.FromKnownColor witll return Color object and it has properties for Red, Green and Blue components if you want that.

Color c = (Color)TypeDescriptor.GetConverter(typeof(Color)).ConvertFromString("Red");

compare a brush and color

if (backBrush == SystemColors.ActiveCaption)
This fails. Says you can't compare a brush and a color.
How do I find the color of the brush?

If backBrush is a SolidColorBrush (based on what you're trying to do it probably is) you can use:
if(((SolidColorBrush)backBrush).Color == SystemColors.ActiveCaption)

If the brush is a SolidBrush you can compare the Color member of the brush. Something like this.
SolidBrush solidBrush = brush as SolidBrush;
if (solidBrush != null && solidBrush.Color == SystemColors.ActiveCaption)
{
// ....
}
The above is for WinForms, for WPF you would use SolidColorBrush rather than SolidBrush.

A Brush does not have a color.
You use a Brush with a Color for filling/painting etc.
Some brushes do have a color (HatchBrush has two), so you will need to cast to the type of brush and compare colors then:
((HatchBrush)backBrush).BackgroundColor == SystemColors.ActiveCaption

Have you tried the SystemBrushes namespace?
if (backBrush == SystemBrushes.ActiveCaption)
{...