Selecting a subset of elements in LINQ C# with the TakeWhile operator

The TakeWhile extension method in LINQ is similar to Take. With Take you can specify the number of elements to select from a sequence. In the case of TakeWhile we can specify a condition – a boolean function – instead. The operator will take elements from the sequence while the condition is true and then stop.

Data collection:

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Concatenate two IEnumerable sequences in C# .NET

We can use the Range method to build two integer sequences as follows:

IEnumerable<int> firstRange = Enumerable.Range(10, 10);
IEnumerable<int> secondRange = Enumerable.Range(5, 20);

You can join the two sequences using the Concat method:

List<int> concatenated = firstRange.Concat(secondRange).ToList();
concatenated.ForEach(i => Debug.WriteLine(i));

You’ll see that the concatenated sequence holds all numbers from the first and the second sequence:

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Using the let keyword in .NET LINQ to store variables within a statement

It happens that we have a LINQ statement where we want to refer to partial results by variable names while expressing some computation. The “let” keyword lets us do that. Those who are familiar for the F# language already know that “let” is an important keyword to bind some value to a variable.

Suppose we have the following list of integers:

List<int> integers = new List<int>()
{
	5, 7, 4, 6, 10, 4, 6, 4, 5, 12
};

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Breaking up a collection into smaller fixed size collections with C# .NET

Occasionally you may need to break up a large collection into smaller size collections or groups. Consider the following integer list:

List<int> ints = new List<int>() { 1, 4, 2, 5, 2, 6, 5, 43, 6, 234, 645, 2, 12, 45, 13, 5, 3 };

The goal is to break up this list into groups of size 5 and if necessary an additional list for the remaining elements. The following generic method will do the trick:

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Using the let keyword in .NET LINQ to store variables within a statement

It happens that we have a LINQ statement where we want to refer to partial results by variable names while expressing some computation. The “let” keyword lets us do that. Those who are familiar for the F# language already know that “let” is an important keyword to bind some value to a variable.

Suppose we have the following list of integers:

List<int> integers = new List<int>()
{
	5, 7, 4, 6, 10, 4, 6, 4, 5, 12
};

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Creating a grouped join on two sequences using the LINQ GroupJoin operator

The GroupJoin operator is very similar to the Join operator. I won’t repeat the things we discussed there, so I recommend you read that post first if you’re not familiar with that operator.

With GroupJoin we can not only join elements in two sequences but group them at the same time.

GroupJoin has the same signature as Join with one exception. The result selector in Join has the following type:

Func<TOuter, TInner, TResult>

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Concatenate two IEnumerable sequences in C# .NET

We can use the Range method to build two integer sequences as follows:

IEnumerable<int> firstRange = Enumerable.Range(10, 10);
IEnumerable<int> secondRange = Enumerable.Range(5, 20);

You can join the two sequences using the Concat method:

List<int> concatenated = firstRange.Concat(secondRange).ToList();
concatenated.ForEach(i => Debug.WriteLine(i));

You’ll see that the concatenated sequence holds all numbers from the first and the second sequence:

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Determine if all elements fulfil a condition in a sequence with LINQ C#

Say we have the following string list:

string[] bands = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis", "Abba", "Blur", "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil", "Kent", "Madness", "Manic Street Preachers"
, "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears"
, "Deep Purple", "KISS"};

Say we’d like to determine if all elements in the sequence fulfil a certain condition. Nothing could be easier using the All operator:

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Determine if a sequence contains a certain element with LINQ C#

Say we have the following string list:

string[] bands = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis", "Abba", "Blur", "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil", "Kent", "Madness", "Manic Street Preachers"
, "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears"
, "Deep Purple", "KISS"};

If you’d like to check if a certain string element is present in the sequence then you can use the Contains operator in LINQ:

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Finding the set difference between two sequences using the LINQ Except operator

Say you have the following two sequences:

string[] first = new string[] {"hello", "hi", "good evening", "good day", "good morning", "goodbye" };
string[] second = new string[] {"whatsup", "how are you", "hello", "bye", "hi"};

If you’d like to find the values that only figure in “first” then it’s easy to achieve using the LINQ Except operator:

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