private object IncrementCurrentValue()

in src/Microsoft.Xaml.Behaviors/Core/ChangePropertyAction.cs [359:409]

• 44 lines of code
• 9 McCabe index (conditional complexity)

        private object IncrementCurrentValue(PropertyInfo propertyInfo)
        {
            if (!propertyInfo.CanRead)
            {
                throw new InvalidOperationException(string.Format(
                    CultureInfo.CurrentCulture,
                    ExceptionStringTable.ChangePropertyActionCannotIncrementWriteOnlyPropertyExceptionMessage,
                    propertyInfo.Name));
            }

            object currentValue = propertyInfo.GetValue(this.Target, null);
            object returnValue = currentValue;

            Type propertyType = propertyInfo.PropertyType;
            TypeConverter converter = TypeConverterHelper.GetTypeConverter(propertyInfo.PropertyType);
            object value = this.Value;

            if (value == null || currentValue == null)
            {
                // we can't increment by null, so we'll attempt to set it instead
                // likewise, we can't increment, null by x, so we'll just set value instead
                return value;
            }

            if (converter.CanConvertFrom(value.GetType()))
            {
                value = TypeConverterHelper.DoConversionFrom(converter, value);
            }

            if (typeof(double).IsAssignableFrom(propertyType))
            {
                returnValue = (double)currentValue + (double)value;
            }
            else if (typeof(int).IsAssignableFrom(propertyType))
            {
                returnValue = (int)currentValue + (int)value;
            }
            else if (typeof(float).IsAssignableFrom(propertyType))
            {
                returnValue = (float)currentValue + (float)value;
            }
            else if (typeof(string).IsAssignableFrom(propertyType))
            {
                returnValue = (string)currentValue + (string)value;
            }
            else
            {
                returnValue = TryAddition(currentValue, value);
            }
            return returnValue;
        }