첨부 실행 코드는 나눔고딕코딩 폰트를 사용합니다.
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using System;
using Windows.UI.Xaml.Data;

/// <summary>
/// NULL 가능한 진리 값↔진리 값 변환자
/// </summary>
public class NullableBooleanToBooleanConverter : IValueConverter
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Public

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

    /// <summary>
    /// 변환하기
    /// </summary>
    /// <param name="sourceValue">소스 값</param>
    /// <param name="targetType">타겟 타입</param>
    /// <param name="parameter">매개 변수</param>
    /// <param name="language">언어</param>
    /// <returns>변환 값</returns>
    public object Convert(object sourceValue, Type targetType, object parameter, string language)
    {
        if(sourceValue is bool?)
        {
            return (bool)sourceValue;
        }

        return false;
    }

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

    /// <summary>
    /// 역변환하기
    /// </summary>
    /// <param name="sourceValue">소스 값</param>
    /// <param name="targetType">타겟 타입</param>
    /// <param name="parameter">매개 변수</param>
    /// <param name="language">언어</param>
    /// <returns>역변환 값</returns>
    public object ConvertBack(object sourceValue, Type targetType, object parameter, string language)
    {
        if(sourceValue is bool)
        {
            return (bool)sourceValue;
        }

        return false;
    }

    #endregion
}
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