如何对 List进行排序基于 T 的性质？

发布于 2024-07-14 14:12:37 字数 337 浏览 7 评论 0原文

我的代码如下所示：

Collection<NameValueCollection> optionInfoCollection = ....
List<NameValueCollection> optionInfoList = new List<NameValueCollection>();
optionInfoList = optionInfoCollection.ToList();

if(_isAlphabeticalSoting)
   Sort optionInfoList

我尝试了 optionInfoList.Sort() 但它不起作用。

原文

My Code looks like this :

Collection<NameValueCollection> optionInfoCollection = ....
List<NameValueCollection> optionInfoList = new List<NameValueCollection>();
optionInfoList = optionInfoCollection.ToList();

if(_isAlphabeticalSoting)
   Sort optionInfoList

I tried optionInfoList.Sort() but it is not working.

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_失温 2024-07-21 14:12:37

使用排序方法和 lambda 表达式，这非常简单。

myList.Sort((a, b) => String.Compare(a.Name, b.Name))

上面的示例演示了如何按对象类型的 Name 属性进行排序，假设 Name 的类型为字符串。

Using the sort method and lambda expressions, it is really easy.

myList.Sort((a, b) => String.Compare(a.Name, b.Name))

The above example shows how to sort by the Name property of your object type, assuming Name is of type string.

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翻身的咸鱼 2024-07-21 14:12:37

如果您只想让 Sort() 工作，那么您需要在类中实现 IComparable 或 IComparable。

如果您不介意创建新列表，则可以使用OrderBy/ToList LINQ 扩展方法。如果你想用更简单的语法对现有列表进行排序，你可以添加一些扩展方法，启用：

list.Sort(item => item.Name);

例如：

public static void Sort<TSource, TValue>(
    this List<TSource> source,
    Func<TSource, TValue> selector)
{
    var comparer = Comparer<TValue>.Default;
    source.Sort((x, y) => comparer.Compare(selector(x), selector(y)));
}
public  static void SortDescending<TSource, TValue>(
    this List<TSource> source,
    Func<TSource, TValue> selector)
{
    var comparer = Comparer<TValue>.Default;
    source.Sort((x, y) => comparer.Compare(selector(y), selector(x)));
}

If you just want Sort() to work, then you'll need to implement IComparable or IComparable<T> in the class.

If you don't mind creating a new list, you can use the OrderBy/ToList LINQ extension methods. If you want to sort the existing list with simpler syntax, you can add a few extension methods, enabling:

list.Sort(item => item.Name);

For example:

public static void Sort<TSource, TValue>(
    this List<TSource> source,
    Func<TSource, TValue> selector)
{
    var comparer = Comparer<TValue>.Default;
    source.Sort((x, y) => comparer.Compare(selector(x), selector(y)));
}
public  static void SortDescending<TSource, TValue>(
    this List<TSource> source,
    Func<TSource, TValue> selector)
{
    var comparer = Comparer<TValue>.Default;
    source.Sort((x, y) => comparer.Compare(selector(y), selector(x)));
}

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高速公鹿 2024-07-21 14:12:37

public class Person  {
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

List<Person> people = new List<Person>();

people.Sort(
    delegate(Person x, Person y) {
        if (x == null) {
            if (y == null) { return 0; }
            return -1;
        }
        if (y == null) { return 0; }
        return x.FirstName.CompareTo(y.FirstName);
    }
);

public class Person  {
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

List<Person> people = new List<Person>();

people.Sort(
    delegate(Person x, Person y) {
        if (x == null) {
            if (y == null) { return 0; }
            return -1;
        }
        if (y == null) { return 0; }
        return x.FirstName.CompareTo(y.FirstName);
    }
);

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