Part of the 101 LINQ SAMPLES |
This sample shows different uses of Custom Sequence Operators:
This sample calculates the dot product of two integer vectors. It uses a user-created sequence operator, Combine, to calculate the dot product, passing it a lambda function to multiply two arrays, element by element, and sum the result.
public static class CustomSequenceOperators { public static IEnumerable Combine(this IEnumerable first, IEnumerable second, Func func) { using (IEnumerator e1 = first.GetEnumerator(), e2 = second.GetEnumerator()) { while (e1.MoveNext() && e2.MoveNext()) { yield return func(e1.Current, e2.Current); } } } } public void Linq98() { int[] vectorA = { 0, 2, 4, 5, 6 }; int[] vectorB = { 1, 3, 5, 7, 8 }; int dotProduct = vectorA.Combine(vectorB, (a, b) => a * b).Sum(); Console.WriteLine("Dot product: {0}", dotProduct); }
public static class CustomSequenceOperators { public static IEnumerable Combine(this IEnumerable first, IEnumerable second, Func func) { using (IEnumerator e1 = first.GetEnumerator(), e2 = second.GetEnumerator()) { while (e1.MoveNext() && e2.MoveNext()) { yield return func(e1.Current, e2.Current); } } } } public void Linq98() { int[] vectorA = { 0, 2, 4, 5, 6 }; int[] vectorB = { 1, 3, 5, 7, 8 }; int dotProduct = vectorA.Combine(vectorB, (a, b) => a * b).Sum(); Console.WriteLine("Dot product: {0}", dotProduct); }
Dot product: 109
Source Code Files
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