如何通过反射获取类型的所有常量？

  • Z时代
  • 2024-01-10
  • 分类：问答

如何使用反射获取任何类型的所有常量？

回答：

虽然这是一个旧代码：

private FieldInfo[] GetConstants(System.Type type)
{
    ArrayList constants = new ArrayList();
    FieldInfo[] fieldInfos = type.GetFields(
        // Gets all public and static fields
        BindingFlags.Public | BindingFlags.Static | 
        // This tells it to get the fields from all base types as well
        BindingFlags.FlattenHierarchy);
    // Go through the list and only pick out the constants
    foreach(FieldInfo fi in fieldInfos)
        // IsLiteral determines if its value is written at 
        //   compile time and not changeable
        // IsInitOnly determines if the field can be set 
        //   in the body of the constructor
        // for C# a field which is readonly keyword would have both true 
        //   but a const field would have only IsLiteral equal to true
        if(fi.IsLiteral && !fi.IsInitOnly)
            constants.Add(fi);
    // Return an array of FieldInfos
    return (FieldInfo[])constants.ToArray(typeof(FieldInfo));
}

资源

您可以使用泛型和LINQ轻松将其转换为更清晰的代码：

private List<FieldInfo> GetConstants(Type type)
{
    FieldInfo[] fieldInfos = type.GetFields(BindingFlags.Public |
         BindingFlags.Static | BindingFlags.FlattenHierarchy);
    return fieldInfos.Where(fi => fi.IsLiteral && !fi.IsInitOnly).ToList();
}

或一行：

type.GetFields(BindingFlags.Public | BindingFlags.Static |
               BindingFlags.FlattenHierarchy)
    .Where(fi => fi.IsLiteral && !fi.IsInitOnly).ToList();

以上是 如何通过反射获取类型的所有常量？ 的全部内容， 来源链接： utcz.com/qa/401906.html

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