Method Single

Namespace

Xunit

Assembly

xunit.v3.assert.dll

Single(IEnumerable)

Verifies that the given collection contains only a single element of the given type.

public static object? Single(IEnumerable collection)

Parameters

collection IEnumerable

The collection.

Returns

object

The single item in the collection.

Exceptions

Thrown when the collection does not contain exactly one element.

Single(IEnumerable, object?)

Verifies that the given collection contains only a single element of the given value. The collection may or may not contain other values.

public static void Single(IEnumerable collection, object? expected)

Parameters

collection IEnumerable

The collection.

expected object

The value to find in the collection.

Exceptions

Thrown when the collection does not contain exactly one element.

Single<T>(IEnumerable<T>)

Verifies that the given collection contains only a single element of the given type.

public static T Single<T>(IEnumerable<T> collection)

Parameters

collection IEnumerable<T>

The collection.

Returns

T

The single item in the collection.

Type Parameters

T

The collection type.

Exceptions

Thrown when the collection does not contain exactly one element.

Single<T>(IEnumerable<T>, Predicate<T>)

Verifies that the given collection contains only a single element of the given type which matches the given predicate. The collection may or may not contain other values which do not match the given predicate.

public static T Single<T>(IEnumerable<T> collection, Predicate<T> predicate)

Parameters

collection IEnumerable<T>

The collection.

predicate Predicate<T>

The item matching predicate.

Returns

T

The single item in the filtered collection.

Type Parameters

T

The collection type.

Exceptions

Thrown when the filtered collection does not contain exactly one element.