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[ASP.net教程]linq 实现动态 orderby


class Pet {   public string Name{get;set;}   public int Age{get;set;} } void Main() {     Pet[] pets = { new Pet { Name="Tim", Age=18 },           new Pet { Name="Allen", Age=22 },           new Pet { Name="Bill", Age=20 } };     //如果我们想根据Age进行排序 很容易想到这样来写:    var query= from p in pets        orderby p.Age        select p;             query.ToList().ForEach(q=>Console.WriteLine(q.Name +"   "+q.Age));     /* 得到结果:     Tim   18     Bill  20     Allen  22     */      } //但是有时项目内有多个排序条件 如有时要根据Name排序 有时要根据Age排序 何问起 hovertree.com    //这时我们就要用到动态排序: void Main() {    Pet[] pets = { new Pet { Name="Tim", Age=18 },           new Pet { Name="Allen", Age=22 },           new Pet { Name="Bill", Age=20 } };   Console.WriteLine("Before Orderby:/r/n");       pets.ToList().ForEach(p=>Console.WriteLine(p.Name +"   "+p.Age));      var query= from p in pets        orderby GetPropertyValue(p,"Age")         select p;           Console.WriteLine("/r/nAfter Orderby:/r/n");  query.ToList().ForEach(q=>Console.WriteLine(q.Name +"   "+q.Age));       /*     Before Orderby:     Tim   18     Allen  22     Bill  20     After Orderby:         Tim   18     Bill  20     Allen  22     */     } /* 何问起 hovertree.com */private static object GetPropertyValue(object obj, string property) {   System.Reflection.PropertyInfo propertyInfo=obj.GetType().GetProperty(property);   return propertyInfo.GetValue(obj, null); } 

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