自定义集合初始值设定项

不,编译器需要名为 Add 以便集合初始值设定项工作。这在C规范中定义,不能更改:

C语言规范-7.5.10.3集合初始值设定项

应用集合初始值设定项的集合对象必须是实现 System.Collections.IEnumerable 或者发生编译时错误。对于每个指定的元素,集合初始值设定项将调用 添加 方法,将元素初始值设定项的表达式列表作为参数列表,为每个调用应用普通重载解决方案。因此, 集合对象必须包含适用的 添加 方法 对于每个元素初始值设定项。 [强调矿井]

当然, 添加 方法可以接受多个参数(如 Dictionary<TKey, TValue> )以下内容:

dic = new Dictionary<int, int> { 
    { 1, 2 },
    { 3, 4 }
};
// translated to:
dic = new Dictionary<int, int>();
dic.Add(1, 2);
dic.Add(3, 4);

添加一个有效的示例答案。Afaik,只有添加才有效。代码段取自 Marius Schulz

// simple struct which represents a point in three-dimensional space
public struct Point3D
{
    public readonly double X;
    public readonly double Y;
    public readonly double Z;

    public Point3D(double x, double y, double z)
    {
        X = x;
        Y = y;
        Z = z;
    }
}

// implementation of a collection of points, which respects
// the compiler convention for collection initializers and
// therefore both implements IEnumerable<T> and provides
// a public Add method
public class Points : IEnumerable<Point3D>
{
    private readonly List<Point3D> _points;

    public Points()
    {
        _points = new List<Point3D>();
    }

    public void Add(double x, double y, double z)
    {
        _points.Add(new Point3D(x, y, z));
    }

    public IEnumerator<Point3D> GetEnumerator()
    {
        return _points.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

// instantiate the Points class and fill it with values like this:
var cube = new Points
{
    { -1, -1, -1 },
    { -1, -1,  1 },
    { -1,  1, -1 },
    { -1,  1,  1 },
    {  1, -1, -1 },
    {  1, -1,  1 },
    {  1,  1, -1 },
    {  1,  1,  1 }
};