첨부 실행 코드는 나눔고딕코딩 폰트를 사용합니다.

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using System.Globalization;

/// <summary>
/// 색상→문자열 변환자
/// </summary>
public class ColorToStringConverter : IValueConverter
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 변환하기 - Convert(sourceValue, targetType, parameter, cultureInfo)

    /// <summary>
    /// 변환하기
    /// </summary>
    /// <param name="sourceValue">소스 값</param>
    /// <param name="targetType">타겟 타입</param>
    /// <param name="parameter">매개 변수</param>
    /// <param name="cultureInfo">문화 정보</param>
    /// <returns>변환 값</returns>
    public object Convert(object sourceValue, Type targetType, object parameter, CultureInfo cultureInfo)
    {
        Color color = sourceValue as Color;

        if(color == null)
        {
            return null;
        }

        int alpha = (int)Math.Round(255 * color.Alpha);
        int red   = (int)Math.Round(255 * color.Red  );
        int green = (int)Math.Round(255 * color.Green);
        int blue  = (int)Math.Round(255 * color.Blue );

        return $"{alpha:X2}:{red:X2}:{green:X2}:{blue:X2}";
    }

    #endregion
    #region 역변환하기 - ConvertBack(sourceValue, targetType, parameter, cultureInfo)

    /// <summary>
    /// 역변환하기
    /// </summary>
    /// <param name="sourceValue">소스 값</param>
    /// <param name="targetType">타겟 타입</param>
    /// <param name="parameter">매개 변수</param>
    /// <param name="cultureInfo">문화 정보</param>
    /// <returns>역변환 값</returns>
    public object ConvertBack(object sourceValue, Type targetType, object parameter, CultureInfo cultureInfo)
    {
    }

    #endregion
}
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