Question

我正在尝试遍历以下字典

这是字典的样子

B-> N, P
N -> B, S
S-> N
P -> X, Y, U, I, R

如何仅在P的密钥列表上进行迭代，以便它应返回X，Y，U，I，R？

Dictionary<string, List<string>> vertices = new Dictionary<string, List<string>>();

Answer 1

您可以尝试

foreach (var item in vertices["P"])
{
     //handle item value here
}

Answer 2

尝试一下

Dictionary<string, List<string>> vertices = new Dictionary<string, List<string>>();
vertices.Add("B", new List<string> { "N", "P" });
vertices.Add("N", new List<string> { "B", "S" });
vertices.Add("S", new List<string> { "N" });
vertices.Add("P", new List<string> { "X", "Y", "U", "I", "R" });
vertices.TryGetValue("P", out List<string> value);
foreach (string s in value)
{
    Console.Write(s + ",");
}

Answer 3

使用KeyValuePair

真是太好了

因此，您的迭代应如下所示：

var result = vertices.SingleOrDefault(keyValuePair => keyValuePair.Key == "P");
List<string> list = result.Value;
list.ForEach(Console.WriteLine);

Answer 4

我将为此使用LINQ：

KeyValuePair<string, List<string>> entry = vertices.FirstOrDefault(s => s.Key == "P");
foreach(string whatever in entry.Value)
{
     //your text is here
}

遍历字典中的列表以获得一个给定的键

4 个答案: