public static class StaticClass

{

    public static string ValueByKey(this object obj,string key)

    {

        Type type = obj.GetType();

        //可以通过GetProperty取得对象指定的属性信息

        PropertyInfo info = type.GetProperty("属性名");

        PropertyInfo[] ps = type.GetProperties();

        Dictionary<string, string> dic = new Dictionary<string, string>();

        foreach (PropertyInfo p in ps)

        {

            var n = p.Name;

            //可以通过SetValue设置对象的属性值

            //p.SetValue("属性名", "属性值",null);

            var v = p.GetValue(obj, null);

            var t = p.PropertyType;

            if (n != null && v != null)

                dic.Add(n.ToString(), v.ToString());

        }

        return dic[key];

    }

}

string value = new { id = 1, title = "标题" }.GetValue("id");   //结果：1      正确

Object obj = "我是值类型";

if (obj.GetType().IsValueType)

    Console.WriteLine( "类型:" + obj + "为值类型");

else

    Console.WriteLine( "类型:" +obj + "为引用类型");

如果知道Dictionary的类型T1, T2，就可以直接使用下面的方式

if (obj is Dictionary<T1, T2>)