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‎snippets/csharp/System.Linq/Enumerable/AggregateBy/Enumerable.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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</PropertyGroup>
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</Project>

‎snippets/csharp/System.Linq/Enumerable/AggregateBy/enumerable.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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5+
namespace SequenceExamples
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{
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class Program
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{
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// This part is just for testing the examples
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static void Main(string[] args)
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{
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AggregateBy.AggregateBySeedExample();
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}
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#region AggregateBy
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static class AggregateBy
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{
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public static void AggregateBySeedSelectorExample()
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{
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// <Snippet205>
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(string Name, string Department, decimal Salary)[] employees =
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{
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("Ali", "HR", 45000),
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("Samer", "Technology", 50000),
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("Hamed", "Sales", 75000),
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("Lina", "Technology", 65000),
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("Omar", "HR", 40000)
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};
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var result =
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employees.AggregateBy(
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e => e.Department,
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dept => (Total: 0m, Count: 0),
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(acc, e) => (acc.Total + e.Salary, acc.Count + 1)
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);
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foreach (var item in result)
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{
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Console.WriteLine($"{item.Key}: Total={item.Value.Total}, Count={item.Value.Count}");
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}
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/*
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This code produces the following output:
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HR: Total=85000, Count=2
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Technology: Total=115000, Count=2
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Sales: Total=75000, Count=1
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*/
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// </Snippet205>
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}
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53+
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public static void AggregateBySeedExample()
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{
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// <Snippet206>
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(string Name, string Department, decimal Salary)[] employees =
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{
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("Ali", "HR", 45000),
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("Samer", "Technology", 50000),
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("Hamed", "Sales", 75000),
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("Lina", "Technology", 65000),
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("Omar", "HR", 40000)
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};
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var totals =
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employees.AggregateBy(
69+
e => e.Department,
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0m,
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(total, e) => total + e.Salary
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);
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74+
foreach (var item in totals)
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{
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Console.WriteLine($"{item.Key}: {item.Value}");
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}
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/*
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This code produces the following output:
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HR: 85000
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Technology: 115000
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Sales: 75000
85+
*/
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// </Snippet206>
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}
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}
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#endregion
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}
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}

‎snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs‎

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@@ -3205,157 +3205,5 @@ static void TakeLast()
32053205
}
32063206
#endregion
32073207

3208-
#region AggregateBy
3209-
static class AggregateBy
3210-
{
3211-
// <Snippet205>
3212-
public static void AggregateBySeedSelectorExample()
3213-
{
3214-
(string Name, string Department, decimal Salary)[] employees =
3215-
{
3216-
("Ali", "HR", 45000),
3217-
("Samer", "Technology", 50000),
3218-
("Hamed", "Sales", 75000),
3219-
("Lina", "Technology", 65000),
3220-
("Omar", "HR", 40000)
3221-
};
3222-
3223-
var result =
3224-
employees.AggregateBy(
3225-
e => e.Department,
3226-
dept => (Total: 0m, Count: 0),
3227-
(acc, e) => (acc.Total + e.Salary, acc.Count + 1)
3228-
);
3229-
3230-
foreach (var item in result)
3231-
{
3232-
Console.WriteLine($"{item.Key}: Total={item.Value.Total}, Count={item.Value.Count}");
3233-
}
3234-
3235-
/*
3236-
This code produces the following output:
3237-
3238-
HR: Total=85000, Count=2
3239-
Technology: Total=115000, Count=2
3240-
Sales: Total=75000, Count=1
3241-
*/
3242-
}
3243-
// </Snippet205>
3244-
3245-
// <Snippet206>
3246-
public static void AggregateBySeedExample()
3247-
{
3248-
(string Name, string Department, decimal Salary)[] employees =
3249-
{
3250-
("Ali", "HR", 45000),
3251-
("Samer", "Technology", 50000),
3252-
("Hamed", "Sales", 75000),
3253-
("Lina", "Technology", 65000),
3254-
("Omar", "HR", 40000)
3255-
};
3256-
3257-
var totals =
3258-
employees.AggregateBy(
3259-
e => e.Department,
3260-
0m,
3261-
(total, e) => total + e.Salary
3262-
);
3263-
3264-
foreach (var item in totals)
3265-
{
3266-
Console.WriteLine($"{item.Key}: {item.Value}");
3267-
}
3268-
3269-
/*
3270-
This code produces the following output:
3271-
3272-
HR: 85000
3273-
Technology: 115000
3274-
Sales: 75000
3275-
*/
3276-
}
3277-
// </Snippet206>
3278-
}
3279-
#endregion
3280-
3281-
#region UnionBy
3282-
static class UnionBy
3283-
{
3284-
// <Snippet207>
3285-
public static void UnionByKeySelectorExample()
3286-
{
3287-
(int ProductId, string Name , decimal Price)[] localProducts =
3288-
{
3289-
(101, "Laptop", 1000m),
3290-
(102, "Mouse", 100m),
3291-
(103, "Keyboard", 120m)
3292-
};
3293-
3294-
(int ProductId, string Name, decimal Price)[] warehouseProducts =
3295-
{
3296-
(102, "Mouse", 100m), // Duplicate ProductId (already in local)
3297-
(104, "Monitor", 800m),
3298-
(101, "Laptop", 1000m) // Duplicate ProductId (already in local)
3299-
};
3300-
var combinedProducts =
3301-
localProducts.UnionBy(
3302-
warehouseProducts,
3303-
product => product.ProductId
3304-
);
3305-
3306-
foreach (var product in combinedProducts)
3307-
{
3308-
Console.WriteLine($"{product.ProductId}: {product.Name} - ${product.Price}");
3309-
}
3310-
3311-
/*
3312-
This code produces the following output:
3313-
3314-
101: Laptop - $1000
3315-
102: Mouse - $100
3316-
103: Keyboard - $120
3317-
104: Monitor - $800
3318-
*/
3319-
}
3320-
// </Snippet207>
3321-
3322-
// <Snippet208>
3323-
public static void UnionByComparerExample()
3324-
{
3325-
(string Email, string FullName)[] marketingList =
3326-
{
3327-
("Mahmoud.Doe@example.com", "Mahmoud Doe"),
3328-
("alice.smith@example.com", "Alice Smith")
3329-
};
3330-
3331-
(string Email, string FullName)[] salesList =
3332-
{
3333-
("ALICE.SMITH@EXAMPLE.COM", "Alice S."), // Duplicate email, different casing
3334-
("Sara.jones@example.com", "Sara Jones")
3335-
};
3336-
3337-
var combinedList =
3338-
marketingList.UnionBy(
3339-
salesList,
3340-
contact => contact.Email,
3341-
StringComparer.OrdinalIgnoreCase
3342-
);
3343-
3344-
foreach (var contact in combinedList)
3345-
{
3346-
Console.WriteLine($"{contact.FullName} ({contact.Email})");
3347-
}
3348-
3349-
/*
3350-
This code produces the following output:
3351-
3352-
Mahmoud Doe (Mahmoud.Doe@example.com)
3353-
Alice Smith (alice.smith@example.com)
3354-
Sara Jones (Sara.jones@example.com)
3355-
*/
3356-
}
3357-
// </Snippet208>
3358-
}
3359-
#endregion
33603208
}
33613209
}

‎snippets/csharp/System.Linq/Enumerable/CountBy/Enumerable.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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</PropertyGroup>
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8+
</Project>

‎snippets/csharp/System.Linq/Enumerable/CountBy/enumerable.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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5+
namespace SequenceExamples
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{
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class Program
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{
9+
// This part is just for testing the examples
10+
static void Main(string[] args)
11+
{
12+
CountBy.CountByDepartmentExample();
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}
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#region CountBy
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static class CountBy
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{
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public static void CountByDepartmentExample()
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{
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// <Snippet209>
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(string Name, int Age, string Department)[] employees =
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{
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("Saly", 23, "IT"),
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("David", 25, "Sales"),
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("Mahmoud", 22, "IT"),
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("Qamar", 22, "HR"),
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("Sara", 25, "IT"),
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("John", 26, "HR"),
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("Jaffar", 32, "Sales")
31+
};
32+
33+
// Count the number of employees per department
34+
var countPerDepartment = employees.CountBy(employee => employee.Department);
35+
36+
foreach (var item in countPerDepartment)
37+
{
38+
Console.WriteLine($"Department: {item.Key} - Employees Count: {item.Value}");
39+
}
40+
41+
/*
42+
This code produces the following output:
43+
44+
Department: IT - Employees Count: 3
45+
Department: Sales - Employees Count: 2
46+
Department: HR - Employees Count: 2
47+
*/
48+
// </Snippet209>
49+
}
50+
51+
}
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#endregion
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}
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}

‎snippets/csharp/System.Linq/Enumerable/UnionBy/Enumerable.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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3+
<PropertyGroup>
4+
<OutputType>Exe</OutputType>
5+
<TargetFramework>net9.0</TargetFramework>
6+
</PropertyGroup>
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8+
</Project>

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