.NET Lamda 给匿名属性赋值

var _list = new { Name = "111111", Value = "AAAAA" };
_list.Set();
var myAnonInstance = new
{
FirstField = "Hello",
AnotherField = 30,
a = new { a = 111 }
};
Console.WriteLine(myAnonInstance);
myAnonInstance.a.Set(o => o.a, 2222);
myAnonInstance
    .Set(x => x.FirstField, "Hello SO")
    .Set(x => x.AnotherField, 42);
Console.WriteLine(myAnonInstance);

public static class AnonymousObjectMutator
{
    private const BindingFlags FieldFlags = BindingFlags.NonPublic | BindingFlags.Instance;
    private static readonly string[] BackingFieldFormats = { "<{0}>i__Field", "<{0}>" };

    public static T Set<T, TProperty>(this T instance, Expression<Func<T, TProperty>> propExpression, TProperty newValue) where T : class
    {
        var pi = (propExpression.Body as MemberExpression).Member;
        var backingFieldNames = BackingFieldFormats.Select(x => string.Format(x, pi.Name)).ToList();
        var fi = typeof(T)
            .GetFields(FieldFlags)
            .FirstOrDefault(f => backingFieldNames.Contains(f.Name));
        if (fi == null)
        {
            GetDynamicClassBydt("", "bb");
            //throw new NotSupportedException(string.Format("Cannot find backing field for {0}", pi.Name));
        }
        else
        {
            fi.SetValue(instance, newValue);
        }
        return instance;
    }

    /// <summary>
    /// 使用dynamic根据DataTable的列名自动添加属性并赋值
    /// </summary>
    /// <param name="dt"></param>
    /// <returns></returns> 
    public static Object GetDynamicClassBydt(string file, string vl)
    {
        dynamic d = new System.Dynamic.ExpandoObject();
        //创建属性，并赋值。
        (d as System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<string, object>>).Add(new System.Collections.Generic.KeyValuePair<string, object>(file, vl));

        return d;
    }
}