c# - 反射。我们可以使用它实现什么？

Question

我正在阅读和学习 C# 中的反射。知道它对我的日常工作有什么帮助就很好了，所以我希望比我更有经验的人告诉我一些示例或想法，了解我们可以使用它实现什么样的事情，或者我们如何减少代码量我们写的。

谢谢。

Answer 1

我最近用它来为我的枚举中的字段添加自定义属性:

public enum ShapeName
{
    // Lines
    [ShapeDescription(ShapeType.Line, "Horizontal Scroll Distance", "The horizontal distance to scroll the browser in order to center the game.")]
    HorizontalScrollBar,
    [ShapeDescription(ShapeType.Line, "Vertical Scroll Distance", "The vertical distance to scroll the browser in order to center the game.")]
    VerticalScrollBar,
}

使用反射获取字段:

    public static ShapeDescriptionAttribute GetShapeDescription(this ShapeName shapeName)
    {
        Type type = shapeName.GetType();
        FieldInfo fieldInfo = type.GetField(shapeName.ToString());
        ShapeDescriptionAttribute[] attribs = fieldInfo.GetCustomAttributes(typeof(ShapeDescriptionAttribute), false) as ShapeDescriptionAttribute[];

        return (attribs != null && attribs.Length > 0) ? attribs[0] : new ShapeDescriptionAttribute(ShapeType.NotSet, shapeName.ToString());
    }

属性类:

[AttributeUsage(AttributeTargets.Field)]
public class ShapeDescriptionAttribute: Attribute
{
    #region Constructor
    public ShapeDescriptionAttribute(ShapeType shapeType, string name) : this(shapeType, name, name) { }

    public ShapeDescriptionAttribute(ShapeType shapeType, string name, string description)
    {
        Description = description;
        Name = name;
        Type = shapeType;
    }
    #endregion

    #region Public Properties
    public string Description { get; protected set; }

    public string Name { get; protected set; }

    public ShapeType Type { get; protected set; }
    #endregion
}