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Queryable.Zip<TFirst, TSecond, TResult> Method

Merges two sequences by using the specified predicate function.

Namespace:  System.Linq
Assemblies:   System.Linq.Queryable (in System.Linq.Queryable.dll)
  System.Core (in System.Core.dll)

public static IQueryable<TResult> Zip<TFirst, TSecond, TResult>(
	this IQueryable<TFirst> source1,
	IEnumerable<TSecond> source2,
	Expression<Func<TFirst, TSecond, TResult>> resultSelector

Type Parameters


The type of the elements of the first input sequence.


The type of the elements of the second input sequence.


The type of the elements of the result sequence.


Type: System.Linq.IQueryable<TFirst>

The first sequence to merge.

Type: System.Collections.Generic.IEnumerable<TSecond>

The second sequence to merge.

Type: System.Linq.Expressions.Expression<Func<TFirst, TSecond, TResult>>

A function that specifies how to merge the elements from the two sequences.

Return Value

Type: System.Linq.IQueryable<TResult>
An IQueryable<T> that contains merged elements of two input sequences.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable<TFirst>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


source1or source2 is null.

The Zip<TFirst, TSecond, TResult> method generates a MethodCallExpression that represents calling Zip<TFirst, TSecond, TResult> itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source1 parameter.

The method merges each element of the first sequence with an element that has the same index in the second sequence. If the sequences do not have the same number of elements, the method merges sequences until it reaches the end of one of them. For example, if one sequence has three elements and the other one has four, the resulting sequence will have only three elements.

The following code example demonstrates how to use the Zip<TFirst, TSecond, TResult> method to merge two sequences.

            int[] numbers = { 1, 2, 3, 4 };
            string[] words = { "one", "two", "three" };

            var numbersAndWords = numbers.AsQueryable().Zip(words, (first, second) => first + " " + second);

            foreach (var item in numbersAndWords)

            // This code produces the following output: 

            // 1 one 
            // 2 two 
            // 3 three

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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