c# - 将字典转换为列表<struct>

Question

我有一个专门为用户控件创建的结构。我的想法是我将拥有公共(public)属性(property) Guid Dictionary<string, Guid> Attachments然后将其转换为我的私有(private) List<Attachment> attachments在二传手上。我在这样做时遇到了麻烦，最好是使用 linq，但我对替代方案持开放态度。谢谢...

private List<Attachment> attachments;
public struct Attachment
{
    public Guid Id { get; set; }
    public string Name { get; set; }
}
public Dictionary<string, Guid> Attachments
{
    get { return attachments.ToDictionary(a => a.Name, a => a.Id); }
    set { attachments = new List<Attachment> // not sure what to do here }
}

Answer 1

假设这是一个有效的设计(我还没有真正考虑过)我怀疑你想要:

attachments = value.Select(pair => new Attachment { Id = pair.Value,
                                                    Name = pair.Key })
                   .ToList();

不过，我强烈建议您不要使用可变结构。使用结构本身并不算太糟糕，但我会将其更改为:

public struct Attachment
{
    private readonly Guid id;
    private readonly String name;

    public Guid Id { get { return id; } }
    public string Name { get { return name; } }

    public Attachment(Guid id, string name)
    {
        this.id = id;
        this.name = name;
    }
}

...此时转换只是:

attachments = value.Select(pair => new Attachment(pair.Value, pair.Key))
                   .ToList();