C#按原始顺序获取FieldInfos/PropertyInfos？

Question

如何将类型FieldInfos/PropertyInfos作为MemberInfo数组按照它们在类中布局的顺序获取？

class Test
{
    public bool First { get; set; }
    public int Second;
    public string Third { get; set; }
}

Answer 1

http://msdn.microsoft.com/en-us/library/ch9714z3.aspx

GetFields方法不按特定顺序返回字段,例如按字母顺序或声明顺序.您的代码不得依赖于返回字段的顺序,因为该顺序会有所不同.

http://msdn.microsoft.com/en-us/library/kyaxdd3x.aspx

GetProperties方法不以特定顺序返回属性,例如按字母顺序或声明顺序.您的代码不得依赖于返回属性的顺序,因为该顺序会有所不同.

您需要自己定义顺序,可能还有属性:

class Test
{
    [Order(1)] public bool First { get; set; }
    [Order(2)] public int Second;
    [Order(3)] public string Third { get; set; }
}
...
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, 
    Inherited = true, AllowMultiple = false)]
[ImmutableObject(true)]
public sealed class OrderAttribute : Attribute {
    private readonly int order;
    public int Order { get { return order; } }
    public OrderAttribute(int order) {this.order = order;}
}