[C#/MAUI/.NET6] IValueConverter 인터페이스 : 진리 값 반전 변환자 사용하기

■ IValueConverter 인터페이스를 구현해 진리 값 반전 변환자를 사용하는 방법을 보여준다.

 

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using System.Globalization;

 

/// <summary>
/// 진리 값 반전 변환자
/// </summary>
public class InverseBooleanConverter : 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)
{
if(sourceValue is bool?)
{
bool? boolNullable = (bool?)sourceValue;

 

return boolNullable.HasValue ? !boolNullable.Value : true;
}

 

if(sourceValue.GetType() == typeof(bool))
{
return !((bool)sourceValue);
}

 

return true;
}

 

#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)
{
if(sourceValue == null)
{
return true;
}

 

if(sourceValue is bool?)
{
bool? boolNullable = (bool?)sourceValue;

 

return boolNullable.HasValue ? !boolNullable.Value : true;
}

 

if(sourceValue.GetType() == typeof(bool))
{
return !((bool)sourceValue);
}

 

return true;
}

 

#endregion
}
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