Question

我有一个我为usercontrol特定创建的结构。我的想法是，我将拥有一个公共财产Guid Dictionary<string, Guid> Attachments，然后将其转换为我在设置者上的私人List<Attachment> attachments。我很难做到这一点，最好是使用linq，但我愿意接受替代方案。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();

我会强烈阻止你使用可变结构。使用结构本身并不算太糟糕，但我将其更改为：

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();

Answer 2

我想你想要：

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

将字典转换为列表<struct> </struct>

2 个答案: