说的是C#如何体贴程序员,而非.NET Framework。
这是C#对Delegate相关领域下的精微功夫:
List<Product> products = Product.GetSampleProducts();
foreach (Product product in products.OrderBy(p => p.Name)) //entention method
{
Console.WriteLine (product);
}
上面的代码等价于下面的,如何,C#体贴不?
List<Product> products = Product.GetSampleProducts();
products.Sort((x, y) => x.Name.CompareTo(y.Name)); //lambda expression
foreach (Product product in products)
{
Console.WriteLine(product);
}
上面的代码等价于下面的,如何,C#体贴不?
List<Product> products = Product.GetSampleProducts();
products.Sort(delegate(Product x, Product y) //anonymous method
{
return x.Name.CompareTo(y.Name); }
);
foreach (Product product in products)
{
Console.WriteLine(product);
}
上面的代码逻辑上等价于下面的,如何,C#体贴不?
class ProductNameComparer : IComparer<Product> //裸奔流?
{
public int Compare(Product x, Product y)
{
return x.Name.CompareTo(y.Name);
}
}
...
List<Product> products = Product.GetSampleProducts();
products.Sort(new ProductNameComparer());
foreach (Product product in products)
{
Console.WriteLine(product);
}
最后,附上LINQ Query的代码,相信无人不知,不过为了文气的完整,得罗嗦一下,好在这样的代码实在太养眼了。
List<Product> products = Product.GetSampleProducts();
var sorted = from p in products //体贴不?
orderby p.Name
select p;
foreach (Product product in sorted)
{
Console.WriteLine(product);
}
(按:code source from <<C# in Depth>> 2nd.Edition Jon Skeet)
转载于:https://www.cnblogs.com/jamesleng/archive/2011/10/21/2218483.html