Round #878

Convert a List<string> to a Dictionary<string,int> mapping each string to its length, using LINQ's ToDictionary.

Here's how you can convert a `List<string>` to a `Dictionary<string, int>` using LINQ's `ToDictionary` method in C#: ```csharp using System; using System.Collections.Generic; using System.Linq; public class Program { public static void Main() { // Create a list of strings List<string> strings = new List<string> { "apple", "banana", "cherry" }; // Convert the list to a dictionary using ToDictionary Dictionary<string, int> stringLengths = strings.ToDictionary(s => s, s => s.Length); // Print the dictionary foreach (var pair in stringLengths) { Console.WriteLine($"String: {pair.Key}, Length: {pair.Value}"); } } } ``` In this code: 1. We create a `List<string>` called `strings` containing some example strings. 2. We use the `ToDictionary` method to convert the list to a `Dictionary<string, int>`. The first lambda expression `s => s` specifies the key selector (i.e., the string itself), and the second lambda expression `s => s.Length` specifies the value selector (i.e., the length of the string). 3. Finally, we print out the resulting dictionary to verify the conversion. When you run this code, it will output: ``` String: apple, Length: 5 String: banana, Length: 6 String: cherry, Length: 6 ```

```csharp using System.Collections.Generic; using System.Linq; public class Program { public static Dictionary<string, int> ConvertListToDictionary(List<string> strings) { return strings.ToDictionary(s => s, s => s.Length); } public static void Main() { List<string> strings = new List<string> { "apple", "banana", "cherry" }; Dictionary<string, int> dictionary = ConvertListToDictionary(strings); foreach (var pair in dictionary) { System.Console.WriteLine($"Key: {pair.Key}, Value: {pair.Value}"); } } } ```