Assert.ContainsSingle Method

Definition

Namespace:: Microsoft.VisualStudio.TestTools.UnitTesting

Assembly:: MSTest.TestFramework.dll

Assembly:: Microsoft.VisualStudio.TestPlatform.TestFramework.dll

Package:: MSTest.TestFramework v4.1.0

Package:: MSTest.TestFramework v4.2.3

Package:: MSTest.TestFramework v4.4.0

Package:: MSTest.TestFramework v4.3.0

Package:: MSTest.TestFramework v4.0.2

Package:: MSTest.TestFramework v3.10.5

Package:: MSTest.TestFramework v3.11.0

Package:: MSTest.TestFramework v3.8.3

Package:: MSTest.TestFramework v3.9.3

Important

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Overloads

Name	Description
ContainsSingle(IEnumerable, String, String)	Tests whether the specified collection contains exactly one element.
ContainsSingle(Func<Object,Boolean>, IEnumerable, String, String, String)	Tests whether the specified collection contains exactly one element that matches the given predicate.
ContainsSingle<T>(ReadOnlySpan<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)	Tests whether the specified span contains exactly one element.
ContainsSingle<T>(Func<T,Boolean>, Span<T>, String, String, String)	Tests whether the specified span contains exactly one element that matches the given predicate.
ContainsSingle<T>(Func<T,Boolean>, ReadOnlySpan<T>, String, String, String)	Tests whether the specified span contains exactly one element that matches the given predicate.
ContainsSingle<T>(Func<T,Boolean>, ReadOnlyMemory<T>, String, String, String)	Tests whether the specified memory contains exactly one element that matches the given predicate.
ContainsSingle<T>(Func<T,Boolean>, Memory<T>, String, String, String)	Tests whether the specified memory contains exactly one element that matches the given predicate.
ContainsSingle<T>(Func<T,Boolean>, IEnumerable<T>, String, String, String)	Tests whether the specified collection contains exactly one element that matches the given predicate.
ContainsSingle<T>(Span<T>, String, String)	Tests whether the specified span contains exactly one element.
ContainsSingle<T>(Span<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)	Tests whether the specified span contains exactly one element.
ContainsSingle<T>(ReadOnlySpan<T>, String, String)	Tests whether the specified span contains exactly one element.
ContainsSingle<T>(ReadOnlyMemory<T>, String, String)	Tests whether the specified memory contains exactly one element.
ContainsSingle<T>(IEnumerable<T>, String)	Tests whether the specified collection contains exactly one element.
ContainsSingle<T>(Memory<T>, String, String)	Tests whether the specified memory contains exactly one element.
ContainsSingle<T>(IEnumerable<T>, Assert.AssertSingleInterpolatedStringHandler<T>)	Tests whether the specified collection contains exactly one element.
ContainsSingle<T>(ReadOnlyMemory<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)	Tests whether the specified memory contains exactly one element.
ContainsSingle<T>(IEnumerable<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)	Tests whether the specified collection contains exactly one element.
ContainsSingle<T>(IEnumerable<T>)	Tests whether the specified collection contains exactly one element.
ContainsSingle<T>(IEnumerable<T>, String, String)	Tests whether the specified collection contains exactly one element.
ContainsSingle<T>(Func<T,Boolean>, IEnumerable<T>, String)	Tests whether the specified collection contains exactly one element that matches the given predicate.
ContainsSingle<T>(Memory<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)	Tests whether the specified memory contains exactly one element.
ContainsSingle<T>(IEnumerable<T>, String, Object[])	Tests whether the specified collection contains exactly one element.

ContainsSingle(IEnumerable, String, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.ContainsSingle.cs

Tests whether the specified collection contains exactly one element.

public static object? ContainsSingle(System.Collections.IEnumerable collection, string? message = "", string collectionExpression = "");

static member ContainsSingle : System.Collections.IEnumerable * string * string -> obj

Public Shared Function ContainsSingle (collection As IEnumerable, Optional message As String = "", Optional collectionExpression As String = "") As Object

Parameters

collection: IEnumerable

The collection.

message: String

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

Object

The item.

Applies to

ContainsSingle(Func<Object,Boolean>, IEnumerable, String, String, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.ContainsSingle.cs

Tests whether the specified collection contains exactly one element that matches the given predicate.

public static object? ContainsSingle(Func<object?,bool> predicate, System.Collections.IEnumerable collection, string? message = "", string predicateExpression = "", string collectionExpression = "");

static member ContainsSingle : Func<obj, bool> * System.Collections.IEnumerable * string * string * string -> obj

Public Shared Function ContainsSingle (predicate As Func(Of Object, Boolean), collection As IEnumerable, Optional message As String = "", Optional predicateExpression As String = "", Optional collectionExpression As String = "") As Object

Parameters

predicate: Func<Object,Boolean>

A function to test each element for a condition.

collection: IEnumerable

The collection.

message: String

The message to display when the assertion fails.

predicateExpression: String

The syntactic expression of predicate as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

Object

The item that matches the predicate.

Applies to

ContainsSingle<T>(ReadOnlySpan<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)

Tests whether the specified span contains exactly one element.

public static T ContainsSingle<T>(ReadOnlySpan<T> collection, ref Microsoft.VisualStudio.TestTools.UnitTesting.Assert.AssertSingleInterpolatedStringHandler<T> message, string collectionExpression = "");

static member ContainsSingle : ReadOnlySpan<'T> * AssertSingleInterpolatedStringHandler * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As ReadOnlySpan(Of T), ByRef message As Assert.AssertSingleInterpolatedStringHandler(Of T), Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the span items.

Parameters

collection: ReadOnlySpan<T>

The span.

message: Assert.AssertSingleInterpolatedStringHandler<T>

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(Func<T,Boolean>, Span<T>, String, String, String)

Tests whether the specified span contains exactly one element that matches the given predicate.

public static T ContainsSingle<T>(Func<T,bool> predicate, Span<T> collection, string? message = "", string predicateExpression = "", string collectionExpression = "");

static member ContainsSingle : Func<'T, bool> * Span<'T> * string * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (predicate As Func(Of T, Boolean), collection As Span(Of T), Optional message As String = "", Optional predicateExpression As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the span items.

Parameters

predicate: Func<T,Boolean>

A function to test each element for a condition.

collection: Span<T>

The span.

message: String

The message to display when the assertion fails.

predicateExpression: String

The syntactic expression of predicate as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item that matches the predicate.

Applies to

ContainsSingle<T>(Func<T,Boolean>, ReadOnlySpan<T>, String, String, String)

Tests whether the specified span contains exactly one element that matches the given predicate.

public static T ContainsSingle<T>(Func<T,bool> predicate, ReadOnlySpan<T> collection, string? message = "", string predicateExpression = "", string collectionExpression = "");

static member ContainsSingle : Func<'T, bool> * ReadOnlySpan<'T> * string * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (predicate As Func(Of T, Boolean), collection As ReadOnlySpan(Of T), Optional message As String = "", Optional predicateExpression As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the span items.

Parameters

predicate: Func<T,Boolean>

A function to test each element for a condition.

collection: ReadOnlySpan<T>

The span.

message: String

The message to display when the assertion fails.

predicateExpression: String

The syntactic expression of predicate as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item that matches the predicate.

Applies to

ContainsSingle<T>(Func<T,Boolean>, ReadOnlyMemory<T>, String, String, String)

Tests whether the specified memory contains exactly one element that matches the given predicate.

public static T ContainsSingle<T>(Func<T,bool> predicate, ReadOnlyMemory<T> collection, string? message = "", string predicateExpression = "", string collectionExpression = "");

static member ContainsSingle : Func<'T, bool> * ReadOnlyMemory<'T> * string * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (predicate As Func(Of T, Boolean), collection As ReadOnlyMemory(Of T), Optional message As String = "", Optional predicateExpression As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the memory items.

Parameters

predicate: Func<T,Boolean>

A function to test each element for a condition.

collection: ReadOnlyMemory<T>

The memory.

message: String

The message to display when the assertion fails.

predicateExpression: String

The syntactic expression of predicate as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item that matches the predicate.

Applies to

ContainsSingle<T>(Func<T,Boolean>, Memory<T>, String, String, String)

Tests whether the specified memory contains exactly one element that matches the given predicate.

public static T ContainsSingle<T>(Func<T,bool> predicate, Memory<T> collection, string? message = "", string predicateExpression = "", string collectionExpression = "");

static member ContainsSingle : Func<'T, bool> * Memory<'T> * string * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (predicate As Func(Of T, Boolean), collection As Memory(Of T), Optional message As String = "", Optional predicateExpression As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the memory items.

Parameters

predicate: Func<T,Boolean>

A function to test each element for a condition.

collection: Memory<T>

The memory.

message: String

The message to display when the assertion fails.

predicateExpression: String

The syntactic expression of predicate as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item that matches the predicate.

Applies to

ContainsSingle<T>(Func<T,Boolean>, IEnumerable<T>, String, String, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.ContainsSingle.cs

Tests whether the specified collection contains exactly one element that matches the given predicate.

public static T ContainsSingle<T>(Func<T,bool> predicate, System.Collections.Generic.IEnumerable<T> collection, string? message = "", string predicateExpression = "", string collectionExpression = "");

static member ContainsSingle : Func<'T, bool> * seq<'T> * string * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (predicate As Func(Of T, Boolean), collection As IEnumerable(Of T), Optional message As String = "", Optional predicateExpression As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the collection items.

Parameters

predicate: Func<T,Boolean>

A function to test each element for a condition.

collection: IEnumerable<T>

The collection.

message: String

The message to display when the assertion fails.

predicateExpression: String

The syntactic expression of predicate as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item that matches the predicate.

Applies to

ContainsSingle<T>(Span<T>, String, String)

Tests whether the specified span contains exactly one element.

public static T ContainsSingle<T>(Span<T> collection, string? message = "", string collectionExpression = "");

static member ContainsSingle : Span<'T> * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As Span(Of T), Optional message As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the span items.

Parameters

collection: Span<T>

The span.

message: String

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(Span<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)

Tests whether the specified span contains exactly one element.

public static T ContainsSingle<T>(Span<T> collection, ref Microsoft.VisualStudio.TestTools.UnitTesting.Assert.AssertSingleInterpolatedStringHandler<T> message, string collectionExpression = "");

static member ContainsSingle : Span<'T> * AssertSingleInterpolatedStringHandler * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As Span(Of T), ByRef message As Assert.AssertSingleInterpolatedStringHandler(Of T), Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the span items.

Parameters

collection: Span<T>

The span.

message: Assert.AssertSingleInterpolatedStringHandler<T>

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(ReadOnlySpan<T>, String, String)

Tests whether the specified span contains exactly one element.

public static T ContainsSingle<T>(ReadOnlySpan<T> collection, string? message = "", string collectionExpression = "");

static member ContainsSingle : ReadOnlySpan<'T> * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As ReadOnlySpan(Of T), Optional message As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the span items.

Parameters

collection: ReadOnlySpan<T>

The span.

message: String

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(ReadOnlyMemory<T>, String, String)

Tests whether the specified memory contains exactly one element.

public static T ContainsSingle<T>(ReadOnlyMemory<T> collection, string? message = "", string collectionExpression = "");

static member ContainsSingle : ReadOnlyMemory<'T> * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As ReadOnlyMemory(Of T), Optional message As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the memory items.

Parameters

collection: ReadOnlyMemory<T>

The memory.

message: String

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(IEnumerable<T>, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Tests whether the specified collection contains exactly one element.

public static T ContainsSingle<T>(System.Collections.Generic.IEnumerable<T> collection, string? message);

static member ContainsSingle : seq<'T> * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As IEnumerable(Of T), message As String) As T

Type Parameters

T

The type of the collection items.

Parameters

collection: IEnumerable<T>

The collection.

message: String

The message to display when the assertion fails.

Returns

The item.

Applies to

ContainsSingle<T>(Memory<T>, String, String)

Tests whether the specified memory contains exactly one element.

public static T ContainsSingle<T>(Memory<T> collection, string? message = "", string collectionExpression = "");

static member ContainsSingle : Memory<'T> * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As Memory(Of T), Optional message As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the memory items.

Parameters

collection: Memory<T>

The memory.

message: String

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(IEnumerable<T>, Assert.AssertSingleInterpolatedStringHandler<T>)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Tests whether the specified collection contains exactly one element.

public static T ContainsSingle<T>(System.Collections.Generic.IEnumerable<T> collection, ref Microsoft.VisualStudio.TestTools.UnitTesting.Assert.AssertSingleInterpolatedStringHandler<T> message);

static member ContainsSingle : seq<'T> * AssertSingleInterpolatedStringHandler -> 'T

Public Shared Function ContainsSingle(Of T) (collection As IEnumerable(Of T), ByRef message As Assert.AssertSingleInterpolatedStringHandler(Of T)) As T

Type Parameters

T

The type of the collection items.

Parameters

collection: IEnumerable<T>

The collection.

message: Assert.AssertSingleInterpolatedStringHandler<T>

The message to display when the assertion fails.

Returns

The item.

Applies to

ContainsSingle<T>(ReadOnlyMemory<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)

Tests whether the specified memory contains exactly one element.

public static T ContainsSingle<T>(ReadOnlyMemory<T> collection, ref Microsoft.VisualStudio.TestTools.UnitTesting.Assert.AssertSingleInterpolatedStringHandler<T> message, string collectionExpression = "");

static member ContainsSingle : ReadOnlyMemory<'T> * AssertSingleInterpolatedStringHandler * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As ReadOnlyMemory(Of T), ByRef message As Assert.AssertSingleInterpolatedStringHandler(Of T), Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the memory items.

Parameters

collection: ReadOnlyMemory<T>

The memory.

message: Assert.AssertSingleInterpolatedStringHandler<T>

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(IEnumerable<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.ContainsSingle.cs

Tests whether the specified collection contains exactly one element.

public static T ContainsSingle<T>(System.Collections.Generic.IEnumerable<T> collection, ref Microsoft.VisualStudio.TestTools.UnitTesting.Assert.AssertSingleInterpolatedStringHandler<T> message, string collectionExpression = "");

static member ContainsSingle : seq<'T> * AssertSingleInterpolatedStringHandler * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As IEnumerable(Of T), ByRef message As Assert.AssertSingleInterpolatedStringHandler(Of T), Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the collection items.

Parameters

collection: IEnumerable<T>

The collection.

message: Assert.AssertSingleInterpolatedStringHandler<T>

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(IEnumerable<T>)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Tests whether the specified collection contains exactly one element.

public static T ContainsSingle<T>(System.Collections.Generic.IEnumerable<T> collection);

static member ContainsSingle : seq<'T> -> 'T

Public Shared Function ContainsSingle(Of T) (collection As IEnumerable(Of T)) As T

Type Parameters

T

The type of the collection items.

Parameters

collection: IEnumerable<T>

The collection.

Returns

The item.

Applies to

ContainsSingle<T>(IEnumerable<T>, String, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.ContainsSingle.cs

Tests whether the specified collection contains exactly one element.

public static T ContainsSingle<T>(System.Collections.Generic.IEnumerable<T> collection, string? message = "", string collectionExpression = "");

static member ContainsSingle : seq<'T> * string * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As IEnumerable(Of T), Optional message As String = "", Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the collection items.

Parameters

collection: IEnumerable<T>

The collection.

message: String

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(Func<T,Boolean>, IEnumerable<T>, String)

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Tests whether the specified collection contains exactly one element that matches the given predicate.

public static T ContainsSingle<T>(Func<T,bool> predicate, System.Collections.Generic.IEnumerable<T> collection, string message = "");

static member ContainsSingle : Func<'T, bool> * seq<'T> * string -> 'T

Public Shared Function ContainsSingle(Of T) (predicate As Func(Of T, Boolean), collection As IEnumerable(Of T), Optional message As String = "") As T

Type Parameters

T

The type of the collection items.

Parameters

predicate: Func<T,Boolean>

A function to test each element for a condition.

collection: IEnumerable<T>

The collection.

message: String

The message format to display when the assertion fails.

Returns

The item that matches the predicate.

Applies to

ContainsSingle<T>(Memory<T>, Assert.AssertSingleInterpolatedStringHandler<T>, String)

Tests whether the specified memory contains exactly one element.

public static T ContainsSingle<T>(Memory<T> collection, ref Microsoft.VisualStudio.TestTools.UnitTesting.Assert.AssertSingleInterpolatedStringHandler<T> message, string collectionExpression = "");

static member ContainsSingle : Memory<'T> * AssertSingleInterpolatedStringHandler * string -> 'T

Public Shared Function ContainsSingle(Of T) (collection As Memory(Of T), ByRef message As Assert.AssertSingleInterpolatedStringHandler(Of T), Optional collectionExpression As String = "") As T

Type Parameters

T

The type of the memory items.

Parameters

collection: Memory<T>

The memory.

message: Assert.AssertSingleInterpolatedStringHandler<T>

The message to display when the assertion fails.

collectionExpression: String

The syntactic expression of collection as given by the compiler via caller argument expression. Users shouldn't pass a value for this parameter.

Returns

The item.

Applies to

ContainsSingle<T>(IEnumerable<T>, String, Object[])

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Source:: Assert.Contains.cs

Tests whether the specified collection contains exactly one element.

public static T ContainsSingle<T>(System.Collections.Generic.IEnumerable<T> collection, string? message, params object?[]? parameters);

static member ContainsSingle : seq<'T> * string * obj[] -> 'T

Public Shared Function ContainsSingle(Of T) (collection As IEnumerable(Of T), message As String, ParamArray parameters As Object()) As T

Type Parameters

T

The type of the collection items.

Parameters

collection: IEnumerable<T>

The collection.

message: String

The message format to display when the assertion fails.

parameters: Object[]

The parameters to format the message.

Returns

The item.

Applies to

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