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Maybe another output option would be interesting to you.
...
string query;
while ((query = Console.ReadLine()) != null) // Read to the end. It is also suitable if the number of names being checked is unknown.
{
if (phoneList.TryGetValue(query, out string phone))
Console.WriteLine($"{query}={phone}");
else
Console.WriteLine("Not found");
}
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Day 8: Dictionaries and Maps
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Maybe another output option would be interesting to you.
...
string query;
while ((query = Console.ReadLine()) != null) // Read to the end. It is also suitable if the number of names being checked is unknown.
{
if (phoneList.TryGetValue(query, out string phone))
Console.WriteLine($"{query}={phone}");
else
Console.WriteLine("Not found");
}