按字符串成员对自定义对象的 ArrayList 进行排序 [英] Sort ArrayList of custom objects by String member

问题描述

我在按字符串字段对自定义对象的arraylist进行排序时遇到问题.
这是我正在尝试执行的代码:

I'm having a issue sorting an arraylist of custom objects by a string field.
This is the code I'm trying to do:

arrRegion.Sort(delegate(Portal.Entidad.Region x, Portal.Entidad.Region y)
                           {
                               return x.RegNombre.CompareTo(y.RegNombre);
                           });

但我收到此错误:

Argument type 'anonymous method' is not assignable to parameter type 'System.Collection.IComparer'

我错过了什么?

推荐答案

也许你应该使用 System.Linq 命名空间中提供的扩展方法:

Maybe you should use the extension methods provided in System.Linq namespace:

using System.Linq;
//...

// if you might have objects of other types, OfType<> will
// - filter elements that are not of the given type
// - return an enumeration of the elements already cast to the right type
arrRegion.OfType<Portal.Entidad.Region>().OrderBy(r => r.RegNombre);

// if there is only a single type in your ArrayList, use Cast<>
// to return an enumeration of the elements already cast to the right type
arrRegion.Cast<Portal.Entidad.Region>().OrderBy(r => r.RegNombre);

如果您可以控制原始 ArrayList 并且可以将其类型更改为类型化列表，例如 List，我建议您这样做.然后你就不需要在之后投射所有内容并且可以这样排序:

If you have control over the original ArrayList and you can change its type to a typed list like this List<Portal.Entidad.Region>, I would suggest you do it. Then you would not need to cast everything afterward and can sort like this:

var orderedRegions = arrRegion.OrderBy(r => r.RegNombre);

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