C#按原始顺序获取FieldInfos/PropertyInfos？

Question

如何按照类中的排列顺序获取类型 FieldInfos/PropertyInfos 作为 MemberInfo 数组？

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

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.

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

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

您需要自己定义顺序，可能需要使用属性:

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;}
}