how to select values in a dictionary in csharp

In C#, you can select values from a dictionary using the following approaches:

Accessing values using keys: You can access the values in a dictionary by indexing the key of the required value in the dictionary. Here is an example:


main.cs
Dictionary<string, int> dict = new Dictionary<string, int>();
dict.Add("A", 1);
dict.Add("B", 2);
dict.Add("C", 3);
// accessing values using keys
int value1 = dict["A"]; // returns 1
int value2 = dict["C"]; // returns 3
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Iterating over the dictionary: You can iterate over the dictionary to select values using keys or values. Here is an example:


main.cs
Dictionary<string, int> dict = new Dictionary<string, int>();
dict.Add("A", 1);
dict.Add("B", 2);
dict.Add("C", 3);
// iterating over the dictionary to select values using keys
foreach (KeyValuePair<string, int> kvp in dict)
{
    string key = kvp.Key; // key
    int value = kvp.Value; // value
    if (key == "A")
    {
        // do something with the value
    }
}
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Using LINQ: You can use LINQ to select values based on specific conditions. Here is an example:


main.cs
Dictionary<string, int> dict = new Dictionary<string, int>();
dict.Add("A", 1);
dict.Add("B", 2);
dict.Add("C", 3);
// selecting values using LINQ
int selectedValue = dict.Where(kvp => kvp.Key == "B").Select(kvp => kvp.Value).FirstOrDefault();
// selectedValue will be 2 if it exists in the dictionary, otherwise default(int) i.e 0
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In all these approaches, the concept of key-value pairs is fundamental. A dictionary in C# is a collection of key-value pairs, where each key is unique and each value can be accessed using its corresponding key.

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