当值是类类型时如何显示字典中的所有值[重复]

Question

我有一本字典，试图从中显示所有值。我找到的答案的问题是它们只返回键和值。我的值是我在存储库中创建的类型。

1. 下面是我的字典。我的价值是具有多个属性的 Badge 类：

public class BadgesRepository
{
    private Dictionary<int, Badge> badgeDictionary = new Dictionary<int, Badge>();
    public void AddBadgeDictionaryEntry(int badgeID, Badge newBadge)
    {
        badgeDictionary.Add(badgeID, newBadge);
    }
}

1. 下面是我的徽章类：

public class Badge
{
    public int BadgeID { get; set; }
    public string BadgeName { get; set; }
    public List<string> DoorList { get; set; }
}

1. 这里我想显示字典的所有值：

private void ViewAllBadges()
{
    Console.WriteLine("All badge data is listed below: ");
    Dictionary<int, Badge>.ValueCollection values = 
    foreach (Badge val in values)
    {
        Console.WriteLine("Badge ID: {0}", val);
    }
}

Answer 1

你只需要一个用于 Badge 类的 ToString 方法，我想。 https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/how-to-override-the-tostring-method。 基于他们的例子：

class Person
{
    public int BadgeID { get; set; }
    public string BadgeName { get; set; }
    public List<string> DoorList { get; set; }

    public override string ToString()
    {
        return BadgeID.ToString() + " " + 
               BadgeName + " "+
               String.Join(", ", DoorList.ToArray()); 
    }
}

Answer 2

您可以在 Badge 类中覆盖 ToString()，就像 roadrunner66 提到的那样

然后

foreach (var item in badgeDictionary)
{
    Badge badge = item.Value;
    Console.WriteLine(badge.ToString());
}

或者

foreach (var item in badgeDictionary)
{
    Badge badge = item.Value;

    Console.WriteLine("Badge ID: {0} BadgeName {1} DoorList {2}", badge.BadgeID, badge.BadgeName, String.Join(", ", badge.DoorList.ToArray()));
}

（上面的代码只是想法，我还没有尝试构建这个代码，所以可能会出错。）

Answer 3

private void ViewAllBadges()
{
   Console.WriteLine("All badge data is listed below: ");
   Dictionary<int, Badge>.ValueCollection values = 
   foreach (Badge val in values)
   {
       Console.WriteLine("Badge ID: {0}", val);
   }
}

您似乎想使用 Dictionary<TKey,TValue>.Values 属性。

将ViewAllBadges 方法添加到您的BadgesRepository 类中。注意foreach 循环中的.Values 属性：

public class BadgesRepository
{
    private Dictionary<int, Badge> badgeDictionary = new Dictionary<int, Badge>();

    public void AddBadgeDictionaryEntry(int badgeID, Badge newBadge)
    {
        badgeDictionary.Add(badgeID, newBadge);
    }

    public void ViewAllBadges()
    {
        foreach (Badge badge in badgeDictionary.Values)
        {
            Console.WriteLine(
                $"Badge ID: {badge.BadgeID}, " +
                $"Badge name: {badge.BadgeName}, " +
                $"Door list: {string.Join(", ", badge.DoorList)}");
        }
    }
}

您也可以按照其他人的建议在您的Badges 班级中override ToString()...

public class Badge
{
    public int BadgeID { get; set; }
    public string BadgeName { get; set; }
    public List<string> DoorList { get; set; }

    public override string ToString()
    {
        return $"Badge ID: {BadgeID}, " +
                $"Badge name: {BadgeName}, " +
                $"Door list: {string.Join(", ", DoorList)}";
    }
}

...并简化ViewAllBadges() 方法：

public void ViewAllBadges()
{
    foreach (Badge badge in badgeDictionary.Values)
    {
        Console.WriteLine(badge.ToString());
    }
}

这是一个示例调用代码：

var bd = new BadgesRepository();

var badge1 = new Badge();
badge1.BadgeID = 1;
badge1.BadgeName = "One";
badge1.DoorList = new List<string>() { "Door 1", "Door 100" };
bd.AddBadgeDictionaryEntry(1, badge1);

var badge2 = new Badge();
badge2.BadgeID = 2;
badge2.BadgeName = "Two";
badge2.DoorList = new List<string>() { "Door 2", "Door 200" };
bd.AddBadgeDictionaryEntry(2, badge2);

var badge3= new Badge();
badge3.BadgeID = 3;
badge3.BadgeName = "Three";
badge3.DoorList = new List<string>() { "Door 3", "Door 300" };
bd.AddBadgeDictionaryEntry(3, badge3);

bd.ViewAllBadges();