简化集合初始化

发布于 2024-11-03 17:51:51 字数 355 浏览 0 评论 0原文

在初始化 WF4 活动时，我们可以执行以下操作：

Sequence s = new Sequence()
{
    Activities = {
        new If() ...,
        new WriteLine() ...,
    }
}

请注意，Sequence.Activities 是一个 Collection，但无需使用新的 Collection() 即可对其进行初始化。

如何在我的 Collection 属性上模拟此行为？

原文

While initializing WF4 activities we can do something like this:

Sequence s = new Sequence()
{
    Activities = {
        new If() ...,
        new WriteLine() ...,
    }
}

Note that Sequence.Activities is a Collection<Activity> but it can be initialized without the new Collection().

How can I emulate this behaviour on my Collection<T> properties?

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岁月打碎记忆 2024-11-10 17:51:51

任何具有 Add() 方法并实现 IEnumerable 的集合都可以通过这种方式初始化。有关详细信息，请参阅C# 的对象和集合初始值设定项。（缺少 new Collection 调用是由于对象初始值设定项，而内联添加项目的能力是由于集合初始值设定项。）

编译器将自动调用 类上的 Add() 方法以及集合初始化块中的项目。

作为示例，这里有一段非常简单的代码来演示：

using System;
using System.Collections.ObjectModel;

class Test
{
    public Test()
    {
        this.Collection = new Collection<int>();
    }

    public Collection<int> Collection { get; private set; }

    public static void Main()
    {

        // Note the use of collection intializers here...
        Test test = new Test
            {
                Collection = { 3, 4, 5 }
            };


        foreach (var i in test.Collection)
        {
            Console.WriteLine(i);
        }

        Console.WriteLine("Press any key to exit...");
        Console.ReadKey();
    }  
}

Any collection that has an Add() method and implements IEnumerable can be initialized this way. For details, refer to Object and Collection Initializers for C#. (The lack of the new Collection<T> call is due to an object initializer, and the ability to add the items inline is due to the collection initializer.)

The compiler will automatically call the Add() method on your class with the items within the collection initialization block.

As an example, here is a very simple piece of code to demonstrate:

using System;
using System.Collections.ObjectModel;

class Test
{
    public Test()
    {
        this.Collection = new Collection<int>();
    }

    public Collection<int> Collection { get; private set; }

    public static void Main()
    {

        // Note the use of collection intializers here...
        Test test = new Test
            {
                Collection = { 3, 4, 5 }
            };


        foreach (var i in test.Collection)
        {
            Console.WriteLine(i);
        }

        Console.WriteLine("Press any key to exit...");
        Console.ReadKey();
    }  
}

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