How to get a SUM in Linq?

How to get a SUM in Linq?

To get the sum of a column in a collection using LINQ, you can use the Sum extension method. Here's an example:

var sum = collection.Sum(item => item.Column);

In this example, collection is the collection of objects, and Column is the column that you want to sum.

The Sum method takes a lambda expression that specifies the column to sum. In this example, the lambda expression item => item.Column returns the value of the Column property for each item in the collection.

The Sum method returns the sum of the values in the specified column as a double. If the collection is empty, it returns 0.

Here's an example that calculates the sum of the Price column in a collection of Product objects:

public class Product { public int Id { get; set; } public string Name { get; set; } public double Price { get; set; } } var products = new List<Product> { new Product { Id = 1, Name = "Product 1", Price = 10.0 }, new Product { Id = 2, Name = "Product 2", Price = 20.0 }, new Product { Id = 3, Name = "Product 3", Price = 30.0 }, }; var total = products.Sum(p => p.Price); Console.WriteLine($"Total price: {total}");

This code calculates the total price of all the products in the products list and outputs it to the console.

Examples

  1. "LINQ sum of integers in a collection"

    // Code int sum = numbers.Sum();

    Description: Calculates the sum of integers in a collection using the Sum method in LINQ.

  2. "LINQ sum with condition in a list"

    // Code int sum = numbers.Where(x => x > 5).Sum();

    Description: Filters a collection and calculates the sum of elements meeting a specific condition using LINQ.

  3. "LINQ sum of a property in a collection of objects"

    // Code decimal totalAmount = orders.Sum(order => order.Amount);

    Description: Computes the sum of a specific property (Amount) in a collection of objects using LINQ.

  4. "LINQ sum with grouping in a collection"

    // Code var groupSums = items.GroupBy(item => item.Category) .Select(group => new { Category = group.Key, Sum = group.Sum(item => item.Quantity) });

    Description: Groups a collection by a property (Category) and calculates the sum within each group using LINQ.

  5. "LINQ sum of a property with condition"

    // Code decimal totalDiscount = orders.Where(order => order.IsDiscounted).Sum(order => order.DiscountAmount);

    Description: Filters a collection based on a condition (IsDiscounted) and calculates the sum of a property (DiscountAmount) using LINQ.

  6. "LINQ sum of nullable integers"

    // Code int? total = numbers.Sum();

    Description: Calculates the sum of nullable integers in a collection using the Sum method.

  7. "LINQ sum with multiple conditions"

    // Code int sum = numbers.Where(x => x > 5 && x % 2 == 0).Sum();

    Description: Applies multiple conditions while filtering a collection and computes the sum using LINQ.

  8. "LINQ sum with projection"

    // Code decimal totalPrice = products.Sum(product => product.Quantity * product.Price);

    Description: Projects each element in a collection before calculating the sum using LINQ.

  9. "LINQ sum of a property with null handling"

    // Code decimal totalAmount = orders.Sum(order => order?.Amount ?? 0);

    Description: Handles null values while calculating the sum of a property (Amount) in a collection of objects using LINQ.

  10. "LINQ sum of TimeSpan values"

    // Code TimeSpan totalTime = timeIntervals.Sum();

    Description: Computes the sum of TimeSpan values in a collection using the Sum method in LINQ.

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