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但是这样如果属性很多，会产生很多的类，怎么办呢。那么利用反射吧。将ComparaCarAdapter改造为：

    public class ComparaCarAdapter : IComparer<Car>
    {
        string _progName = "";
        public ComparaCarAdapter(string progName)
        {
            _progName = progName;
        }
        #region IComparer<Employee> 成员

        public int Compare(Car x, Car y)
        {
            Type t = typeof(Car);
            PropertyInfo pi = t.GetProperty(_progName);            
            object xvalue = pi.GetValue(x, null);
            object yvalue = pi.GetValue(y, null);
            if (xvalue is string)
            {
                return ((string)xvalue).CompareTo((string)yvalue);
            }
            else
            {
                if (xvalue is int)
                    return ((int)xvalue).CompareTo((int)yvalue);
            }
            throw new NotSupportedException();
        }

        #endregion
    }

调用

Array.Sort<Car>(arr, new ComparaCarAdapter("Weight"));