c# - FieldInfo[] Type.GetFields() 的顺序有保证吗？

Question

目前我在做这样的事情:

class Foo {
    // Declare Fields
    [FieldName("F_BAR")] public int?    Bar;
    [FieldName("F_BAZ")] public int?    Baz;
    [FieldName("BLARG")] public double? Bee;
    
    // And a custom selector
    public static string FooFields() {
        // which looks something like:
        StringBuilder fields = new StringBuilder();
        foreach( FieldInfo f in typeof(Foo).GetFields() )
            fields.Append(", " +
                f.GetCustomAttributes(
                    typeof(FieldNameAttribute),
                    false)[0].FieldName );
        return fields.ToString().Substring(2);
    }
    // .. which will be used like this:
    public static string ExampleSelect() {
        return "select " + Foo.FooFields() + " from tablename";
    }
    
    // And a custom reader, formatted for the custom selector
    public static Foo Read(DbDataReader reader) {
        int i = -1;
        return new Foo {
            Bar = reader.IsDBNull(++i)
                ? (int?)null
                : Convert.ToInt32(reader.GetValue(i)),
            Baz = reader.IsDBNull(++i)
                ? (int?)null
                : Convert.ToInt32(reader.GetValue(i)),
            Bee = reader.IsDBNull(++i)
                ? (double?)null
                : Convert.ToDouble(reader.GetValue(i))
        };
    }
}

目前，它有效。我今天意识到，这取决于从 GetFields() 返回的字段，这些字段按照我在类中声明的顺序排列。这总是预期的行为吗？仅在 .NET 中？

编辑:如果有 cases当它不起作用时，我是否可以假设只要我不做任何破坏缓存的事情它就会起作用？

Answer 1

否 GetFields 方法不会以任何特定顺序返回 FieldInfo 值。这是来自 MSDN 的相关文档片段

The GetFields method does not return fields in a particular order, such as alphabetical or declaration order. Your code must not depend on the order in which fields are returned, because that order varies.