如何迭代元组项目

Question

如何迭代元组中的项目,当我在编译时不知道元组由哪些类型组成？我只需要一个IEnumerable对象(用于序列化).

private static IEnumerable TupleToEnumerable(object tuple)
{
    Type t = tuple.GetType();
    if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Tuple<,>))
    {
        var x = tuple as Tuple<object, object>;
        yield return x.Item1;
        yield return x.Item2;
    }
}

Answer 1

在 .NET Core 2.0+ 或 .NET Framework 4.7.1+ 中，有

• t.长度
• t[i]

它来自接口ITuple 接口

var data = (123, "abc", 0.983, DateTime.Now);
ITuple iT = data as ITuple;

for(int i=0; i<iT.Length;i++)
  Console.WriteLine(iT[i]);

Answer 2

您可以通过反射来访问属性及其值 Type.GetProperties

var values = tuple.GetType().GetProperties().Select(property => property.GetValue(tuple));

所以你的方法Linq查询会非常简单

private static IEnumerable TupleToEnumerable(object tuple)
{
    // You can check if type of tuple is actually Tuple
    return tuple.GetType()
                .GetProperties()
                .Select(property => property.GetValue(tuple));
}