消除颜色的透明度 [英] Removing transparency from color

问题描述

当前，我正在使用此代码将RGB字符串转换为一种颜色，以将其设置为文本框的背景.

Currently I am using this code to convert my RGB string to a color to set as a the background for a Text Box.

 ColorConverter colorConverter = new ColorConverter();
 colorTextBox1.BackColor = (Color)colorConverter.ConvertFromString(displayColor);

但是运行此代码时出现此错误. 当displayColor = "#16776960"的值时.

But I get this error when I run this code. when the value of displayColor = "#16776960".

An unhandled exception of type 'System.ArgumentException' occurred in System.Windows.Forms.dll
Additional information: Control does not support transparent background colors.

关于如何从颜色中获取透明度的任何想法吗?

Any idea on how I can take out transparency from the color?

我要做的就是使文本框的背景变为彩色.

All I want it to do is make the background of the text box that color.

推荐答案

控件不支持半透明颜色，并且您的十六进制字符串的开头为16，即alpha分量.要将颜色应用于控件，您将需要从中去除Alpha.

Controls do not support semi-transparent colors, and your hex string has 16 at the beginning, which is the alpha component. To apply the color to a control, you will need to strip the alpha from it.

ColorConverter colorConverter = new ColorConverter();
Color color = (Color)colorConverter.ConvertFromString(displayColor);
color = Color.FromARGB(255, color.R, color.G, color.B);
colorTextBox1.BackColor = color;

如果字符串的长度超过7个字符(6个颜色字符和1个#)，您也可以从字符串中简单地删除它.

You can also simply remove the alpha from the string if it is more than 7 characters long (6 color chars and 1 #)

string hex = "#16776960";
if (hex.Length > 7)
   hex = hex.Remove(1,2);

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