回答編集履歴
1
sealed
test
CHANGED
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@@ -79,7 +79,7 @@
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79
79
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```
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```cs
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82
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-
public
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82
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+
public class BoolNegationConverter : IValueConverter
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{
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public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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=> !(value is bool && (bool)value);
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