What is the method for calculating the sum with C# lambda expressions?

In C#, you can use Lambda expressions to calculate the sum. Here is the method for calculating the sum using Lambda expressions:

// 使用Lambda表达式求和
List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int sum = numbers.Sum();
Console.WriteLine(sum);

The code above first creates a list of integers, and then uses the Sum() method to calculate the sum. In this example, the output will be 15 because 1+2+3+4+5 equals 15.

Note: In order to use Lambda expressions for summing, the System.Linq namespace must be included.