在 LINQ 中使用 TryGetValue()？

Dictionary<string, int> dict = new Dictionary<string, int>()
{
    { "apple", 1 },
    { "banana", 2 },
    { "orange", 3 }
};

string keyToFind = "banana";
int value;

var result = dict.FirstOrDefault(x => x.Key == keyToFind);

if (result.Equals(default(KeyValuePair<string, int>)))
{
    // Key not found
    Console.WriteLine("Key not found");
}
else
{
    // Key found
    value = result.Value;
    Console.WriteLine("Value: " + value);
}