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# How To Combine And Sum A Parts Of List? C# Update Mới

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## Xem thông tin về How to combine and sum a parts of List? C#

### Thông tin về câu hỏi

• Câu hỏi: How to combine and sum a parts of List? C#
• Thời gian hỏi: Hỏi lúc 139 Giờ Trước
• Thời gian trả lời: Trả lời 21 Phút Trước
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### How to combine and sum a parts of List? C#

To combine and sum parts of a `List<T>` in C#, you can use the LINQ extension methods `Skip()` and `Take()` to select the desired elements, and then use the `Sum()` method to calculate their sum.

Here’s an example code that demonstrates how to sum the first three elements of a `List<int>`:

```csharp```List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

int sum = numbers.Take(3).Sum();

Console.WriteLine(sum); // Output: 6
``````

In this example, the `Take(3)` method selects the first three elements of the `numbers` list, and then the `Sum()` method calculates their sum.

Similarly, you can use the `Skip()` method to skip a certain number of elements before selecting the desired ones. For example, to sum the last three elements of the `numbers` list, you can do:

```csharp```int sum = numbers.Skip(numbers.Count - 3).Sum();

Console.WriteLine(sum); // Output: 12
``````

In this example, the `Skip(numbers.Count - 3)` method skips the first two elements of the `numbers` list (since `numbers.Count` is 5, and we want to skip the first two to get the last three), and then the `Sum()` method calculates their sum.

### Xem video liên quan đến How to combine and sum a parts of List? C#

How to sum elements of a list | C# .NET

### How to sum the elements of a list in C#?

To sum the elements of a list in C#, you can use the `Sum` method from the LINQ library. Here’s an example:

```csharp```using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
static void Main()
{
List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int sum = numbers.Sum();

Console.WriteLine("The sum is: " + sum);
}
}
``````

In this example, we first create a list of integers called `numbers` and initialize it with some values. We then use the `Sum` method from the LINQ library to calculate the sum of all the elements in the list. Finally, we print the sum to the console.

Note that to use the `Sum` method, you need to include the `System.Linq` namespace at the top of your code file.

### How to combine two lists in one list in C#?

In C#, you can use the `Concat` method to combine two lists into one list. Here’s an example:

```java```List<int> list1 = new List<int> { 1, 2, 3 };
List<int> list2 = new List<int> { 4, 5, 6 };
List<int> combinedList = list1.Concat(list2).ToList();
``````

In this example, `list1` and `list2` are two separate lists of integers. The `Concat` method is called on `list1`, passing in `list2` as the argument. This creates a new sequence that combines the elements of both lists. Finally, the `ToList` method is called to create a new `List<int>` object that contains all the elements from the combined sequence.

You can modify this example to work with other types of lists as well, such as `List<string>` or `List<object>`. Just replace the `int` type with the appropriate type in the list declaration and initialization.

### How to use sum function in C#?

In C#, the `sum` function is used to calculate the sum of elements in an array or a list. Here’s an example of how to use it:

```csharp```int[] numbers = { 1, 2, 3, 4, 5 };
int sum = numbers.Sum();
Console.WriteLine("The sum of the numbers is: " + sum);
``````

In this example, we have an integer array `numbers` with 5 elements. We call the `Sum` function on this array and assign the result to the integer variable `sum`. Finally, we print out the value of `sum`.

The output of this code will be:

```python```The sum of the numbers is: 15
``````

The `Sum` function can also be used with lists, as shown in this example:

```csharp```List<double> values = new List<double> { 1.5, 2.5, 3.5 };
double sum = values.Sum();
Console.WriteLine("The sum of the values is: " + sum);
``````

In this example, we have a list of doubles `values` with 3 elements. We call the `Sum` function on this list and assign the result to the double variable `sum`. Finally, we print out the value of `sum`.

The output of this code will be:

```python```The sum of the values is: 7.5
``````

Note that to use the `Sum` function, you need to include the following namespace at the beginning of your code:

```csharp```using System.Linq;
``````

This namespace contains the extension methods for working with collections, including the `Sum` function.

## Hình ảnh liên quan đến How to combine and sum a parts of List? C#

Có 6 bài viết về How to combine and sum a parts of List? C#. C Program: Find The Sum Of All Elements Of An Array – W3Resource Python – Combine Two Lists Without Duplicate Values – Stack Overflow

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