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Merged
dotnet-policy-service merged 2 commits into from
Apr 28, 2026
Merged

Merge main into live #12565

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de15102
Add countby example (#12534)
mahmoudbakeer Apr 27, 2026
6148ab4
Fix bad links (#12553)
gewarren Apr 27, 2026
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8 changes: 8 additions & 0 deletions snippets/csharp/System.Linq/Enumerable/AggregateBy/Enumerable.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
</PropertyGroup>

</Project>
92 changes: 92 additions & 0 deletions snippets/csharp/System.Linq/Enumerable/AggregateBy/enumerable.cs
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using System;
using System.Collections.Generic;
using System.Linq;

namespace SequenceExamples
{
class Program
{
// This part is just for testing the examples
static void Main(string[] args)
{
AggregateBy.AggregateBySeedExample();
}

#region AggregateBy
static class AggregateBy
{

public static void AggregateBySeedSelectorExample()
{
// <Snippet205>
(string Name, string Department, decimal Salary)[] employees =
{
("Ali", "HR", 45000),
("Samer", "Technology", 50000),
("Hamed", "Sales", 75000),
("Lina", "Technology", 65000),
("Omar", "HR", 40000)
};

var result =
employees.AggregateBy(
e => e.Department,
dept => (Total: 0m, Count: 0),
(acc, e) => (acc.Total + e.Salary, acc.Count + 1)
);

foreach (var item in result)
{
Console.WriteLine($"{item.Key}: Total={item.Value.Total}, Count={item.Value.Count}");
}

/*
This code produces the following output:

HR: Total=85000, Count=2
Technology: Total=115000, Count=2
Sales: Total=75000, Count=1
*/
// </Snippet205>
}



public static void AggregateBySeedExample()
{
// <Snippet206>
(string Name, string Department, decimal Salary)[] employees =
{
("Ali", "HR", 45000),
("Samer", "Technology", 50000),
("Hamed", "Sales", 75000),
("Lina", "Technology", 65000),
("Omar", "HR", 40000)
};

var totals =
employees.AggregateBy(
e => e.Department,
0m,
(total, e) => total + e.Salary
);

foreach (var item in totals)
{
Console.WriteLine($"{item.Key}: {item.Value}");
}

/*
This code produces the following output:

HR: 85000
Technology: 115000
Sales: 75000
*/
// </Snippet206>
}

}
#endregion
}
}
152 changes: 0 additions & 152 deletions snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs
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Expand Up @@ -3205,157 +3205,5 @@ static void TakeLast()
}
#endregion

#region AggregateBy
static class AggregateBy
{
// <Snippet205>
public static void AggregateBySeedSelectorExample()
{
(string Name, string Department, decimal Salary)[] employees =
{
("Ali", "HR", 45000),
("Samer", "Technology", 50000),
("Hamed", "Sales", 75000),
("Lina", "Technology", 65000),
("Omar", "HR", 40000)
};

var result =
employees.AggregateBy(
e => e.Department,
dept => (Total: 0m, Count: 0),
(acc, e) => (acc.Total + e.Salary, acc.Count + 1)
);

foreach (var item in result)
{
Console.WriteLine($"{item.Key}: Total={item.Value.Total}, Count={item.Value.Count}");
}

/*
This code produces the following output:

HR: Total=85000, Count=2
Technology: Total=115000, Count=2
Sales: Total=75000, Count=1
*/
}
// </Snippet205>

// <Snippet206>
public static void AggregateBySeedExample()
{
(string Name, string Department, decimal Salary)[] employees =
{
("Ali", "HR", 45000),
("Samer", "Technology", 50000),
("Hamed", "Sales", 75000),
("Lina", "Technology", 65000),
("Omar", "HR", 40000)
};

var totals =
employees.AggregateBy(
e => e.Department,
0m,
(total, e) => total + e.Salary
);

foreach (var item in totals)
{
Console.WriteLine($"{item.Key}: {item.Value}");
}

/*
This code produces the following output:

HR: 85000
Technology: 115000
Sales: 75000
*/
}
// </Snippet206>
}
#endregion

#region UnionBy
static class UnionBy
{
// <Snippet207>
public static void UnionByKeySelectorExample()
{
(int ProductId, string Name , decimal Price)[] localProducts =
{
(101, "Laptop", 1000m),
(102, "Mouse", 100m),
(103, "Keyboard", 120m)
};

(int ProductId, string Name, decimal Price)[] warehouseProducts =
{
(102, "Mouse", 100m), // Duplicate ProductId (already in local)
(104, "Monitor", 800m),
(101, "Laptop", 1000m) // Duplicate ProductId (already in local)
};
var combinedProducts =
localProducts.UnionBy(
warehouseProducts,
product => product.ProductId
);

foreach (var product in combinedProducts)
{
Console.WriteLine($"{product.ProductId}: {product.Name} - ${product.Price}");
}

/*
This code produces the following output:

101: Laptop - $1000
102: Mouse - $100
103: Keyboard - $120
104: Monitor - $800
*/
}
// </Snippet207>

// <Snippet208>
public static void UnionByComparerExample()
{
(string Email, string FullName)[] marketingList =
{
("Mahmoud.Doe@example.com", "Mahmoud Doe"),
("alice.smith@example.com", "Alice Smith")
};

(string Email, string FullName)[] salesList =
{
("ALICE.SMITH@EXAMPLE.COM", "Alice S."), // Duplicate email, different casing
("Sara.jones@example.com", "Sara Jones")
};

var combinedList =
marketingList.UnionBy(
salesList,
contact => contact.Email,
StringComparer.OrdinalIgnoreCase
);

foreach (var contact in combinedList)
{
Console.WriteLine($"{contact.FullName} ({contact.Email})");
}

/*
This code produces the following output:

Mahmoud Doe (Mahmoud.Doe@example.com)
Alice Smith (alice.smith@example.com)
Sara Jones (Sara.jones@example.com)
*/
}
// </Snippet208>
}
#endregion
}
}
8 changes: 8 additions & 0 deletions snippets/csharp/System.Linq/Enumerable/CountBy/Enumerable.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
</PropertyGroup>

</Project>
54 changes: 54 additions & 0 deletions snippets/csharp/System.Linq/Enumerable/CountBy/enumerable.cs
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using System;
using System.Collections.Generic;
using System.Linq;

namespace SequenceExamples
{
class Program
{
// This part is just for testing the examples
static void Main(string[] args)
{
CountBy.CountByDepartmentExample();
}

#region CountBy
static class CountBy
{

public static void CountByDepartmentExample()
{
// <Snippet209>
(string Name, int Age, string Department)[] employees =
{
("Saly", 23, "IT"),
("David", 25, "Sales"),
("Mahmoud", 22, "IT"),
("Qamar", 22, "HR"),
("Sara", 25, "IT"),
("John", 26, "HR"),
("Jaffar", 32, "Sales")
};

// Count the number of employees per department
var countPerDepartment = employees.CountBy(employee => employee.Department);

foreach (var item in countPerDepartment)
{
Console.WriteLine($"Department: {item.Key} - Employees Count: {item.Value}");
}

/*
This code produces the following output:

Department: IT - Employees Count: 3
Department: Sales - Employees Count: 2
Department: HR - Employees Count: 2
*/
// </Snippet209>
}

}
#endregion
}
}
8 changes: 8 additions & 0 deletions snippets/csharp/System.Linq/Enumerable/UnionBy/Enumerable.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
</PropertyGroup>

</Project>
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