[C#/MAUI/.NET6] IMultiValueConverter 인터페이스 : 복수 값이 모두 참인 경우 변환자 사용하기

■ IMultiValueConverter 인터페이스를 사용해 복수 값이 모두 참인 경우 변환자를 사용하는 방법을 보여준다.

▶ 예제 코드 (C#)


using System.Globalization;

/// <summary>
/// 다중 값이 모두 참인 경우 변환자
/// </summary>
public class MultipleValueAllTrueConverter : IMultiValueConverter
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Public

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

    /// <summary>
    /// 변환하기
    /// </summary>
    /// <param name="sourceValueArray">소스 값 배열</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[] sourceValueArray, Type targetType, object parameter, CultureInfo cultureInfo)
    {
        if(sourceValueArray == null || !targetType.IsAssignableFrom(typeof(bool)))
        {
            return false;
        }

        foreach(object sourceValue in sourceValueArray)
        {
            if(!(sourceValue is bool booleanValue))
            {
                return false;
            }
            else if(!booleanValue)
            {
                return false;
            }
        }

        return true;
    }

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

    /// <summary>
    /// 역변환하기
    /// </summary>
    /// <param name="sourceValue">소스 값</param>
    /// <param name="targetTypeArray">타겟 타입 배열</param>
    /// <param name="parameter">매개 변수</param>
    /// <param name="cultureInfo">문화 정보</param>
    /// <returns>역변환 값</returns>
    public object[] ConvertBack(object sourceValue, Type[] targetTypeArray, object parameter, CultureInfo cultureInfo)
    {
        if(!(sourceValue is bool booleanValue) || targetTypeArray.Any(targetType => !targetType.IsAssignableFrom(typeof(bool))))
        {
            return null;
        }

        if(booleanValue)
        {
            return targetTypeArray.Select(t => (object)true).ToArray();
        }
        else
        {
            return null;
        }
    }

    #endregion
}

using System.Globalization;

/// <summary>

/// 다중 값이 모두 참인 경우 변환자

/// </summary>

public class MultipleValueAllTrueConverter : IMultiValueConverter

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

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

/// <summary>

/// 변환하기

/// </summary>

/// <param name="sourceValueArray">소스 값 배열</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[] sourceValueArray, Type targetType, object parameter, CultureInfo cultureInfo)

{

if(sourceValueArray == null || !targetType.IsAssignableFrom(typeof(bool)))

{

return false;

}

foreach(object sourceValue in sourceValueArray)

{

if(!(sourceValue is bool booleanValue))

{

return false;

}

else if(!booleanValue)

{

return false;

}

return true;

}

#endregion

#region 역변환하기 - ConvertBack(sourceValue, targetTypeValue, parameter, cultureInfo)

/// <summary>

/// 역변환하기

/// </summary>

/// <param name="sourceValue">소스 값</param>

/// <param name="targetTypeArray">타겟 타입 배열</param>

/// <param name="parameter">매개 변수</param>

/// <param name="cultureInfo">문화 정보</param>

/// <returns>역변환 값</returns>

public object[] ConvertBack(object sourceValue, Type[] targetTypeArray, object parameter, CultureInfo cultureInfo)

{

if(!(sourceValue is bool booleanValue) || targetTypeArray.Any(targetType => !targetType.IsAssignableFrom(typeof(bool))))

{

return null;

}

if(booleanValue)

{

return targetTypeArray.Select(t => (object)true).ToArray();

}

else

{

return null;

}

#endregion

}