转换器最佳实践，以获得更好的性能 [英] Converter best practice for better performance

问题描述

我正在使用WPF转换器，并在性能方面想知道在下面的示例中使用类成员或局部变量会更好吗？

I'm using WPF converter and wondered in terms of performance what would be better in the following example, to use class members or local variables ?

    public object Convert(object value, Type targetType, object parameter,System.Globalization.CultureInfo culture)
    {
        if ((int)value == 1)
            return (Color)ColorConverter.ConvertFromString("#FCD44E");

        return (Color)ColorConverter.ConvertFromString("#FCD44E");
    }

或：

    Color _color1 = (Color)ColorConverter.ConvertFromString("#FCD44E");
    Color _color2 = (Color)ColorConverter.ConvertFromString("#FCD666");

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if ((int)value == 1)
            return _color1;

        return _color2;
    }

推荐答案

效果最好的是如下使用 private static readonly

The most performant would be to use private static readonly as follows

private static readonly Color Color1 = (Color)ColorConverter.ConvertFromString("#FCD44E");
private static readonly Color Color2 = (Color)ColorConverter.ConvertFromString("#FCD666");

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    if ((int)value == 1)
        return Color1;

    return Color2;
}

请参见以下答案进行良好讨论：方法可以设置为静态，但是应该吗？

See this answer for good discussion: Method can be made static, but should it?

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