如何使用反射获取任何类型的所有常量?
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();