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

q107770540

17053人浏览 · 2011-01-13 08:42:00

q107770540 · 2011-01-13 08:42:00 发布

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 //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 */ } private static object GetPropertyValue(object obj, string property) { System.Reflection.PropertyInfo propertyInfo=obj.GetType().GetProperty(property); return propertyInfo.GetValue(obj, null); }