c# - 连接用逗号分隔的字典键

Question

我正在寻找一种更好的方法来连接字典键，这就是我现在正在做的事情：

Dictionary<int, string> myList = new Dictionary<int, string>();

myList.Add(1, "value");
myList.Add(2, "value");
myList.Add(3, "value");
myList.Add(4, "value");

string choices = "";

foreach (int key in myList.Keys)
{
    choices += key + " ";
}

choices = "(" + choices.Trim().Replace(" ", ",") + ")"; // (1,2,3,4)

我敢肯定有更好的方法，也许是 LINQ？

Answer 1

string.Format("({0})", string.Join(",", myList.Keys));

Answer 2

您可以使用：

Dictionary<int, string> myList = new Dictionary<int, string>();

myList.Add(1, "value");
myList.Add(2, "value");
myList.Add(3, "value");
myList.Add(4, "value");

choices = String.Format("({0})", string.Join(",", myList.Keys));