Enumerable.Contains<TSource> Method (IEnumerable<TSource>, TSource)
Determines whether a sequence contains a specified element by using the default equality comparer.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- Type: System.Collections.Generic.IEnumerable<TSource>
A sequence in which to locate a value.
- value
- Type: TSource
The value to locate in the sequence.
Return Value
Type: System.Booleantrue if the source sequence contains an element that has the specified value; otherwise, false.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. When you use instance method syntax to call this method, omit the first parameter.| Exception | Condition |
|---|---|
| ArgumentNullException | source is null. |
If the type of source implements ICollection<T>, the Contains method in that implementation is invoked to obtain the result. Otherwise, this method determines whether source contains the specified element.
Enumeration is terminated as soon as a matching element is found.
Elements are compared to the specified value by using the default equality comparer, Default.
The following code example demonstrates how to use Contains<TSource>(IEnumerable<TSource>, TSource) to determine whether an array contains a specific element.
string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };
string fruit = "mango";
bool hasMango = fruits.Contains(fruit);
outputBlock.Text += String.Format(
"The array {0} contain '{1}'.",
hasMango ? "does" : "does not",
fruit) + "\n";
// This code produces the following output:
//
// The array does contain 'mango'.
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