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Fluent Assertions Documentation
[Root] / FluentAssertions Assembly / FluentAssertions.Primitives Namespace / StringAssertions<TAssertions> Class / Contain Method / Contain(String,OccurrenceConstraint,String,Object[]) Method
The (fragment of a) string that the current string should contain.
A constraint specifying the amount of times a substring should be present within the test subject. It can be created by invoking static methods Once, Twice, Thrice, or Times(int) on the classes FluentAssertions.Exactly, FluentAssertions.AtLeast, FluentAssertions.MoreThan, FluentAssertions.AtMost, and FluentAssertions.LessThan. For example, FluentAssertions.Exactly.Times or FluentAssertions.LessThan.Twice.
A formatted phrase as is supported by System.String.Format(System.String,System.Object[]) explaining why the assertion is needed. If the phrase does not start with the word because, it is prepended automatically.
Zero or more objects to format using the placeholders in because.
In This Topic
    Contain(String,OccurrenceConstraint,String,Object[]) Method
    In This Topic
    Asserts that a string contains another (fragment of a) string a set amount of times.
    Syntax
    public AndConstraint<TAssertions> Contain( 
   string expected,
   OccurrenceConstraint occurrenceConstraint,
   string because,
   params object[] becauseArgs
)

    Parameters

    expected
    The (fragment of a) string that the current string should contain.
    occurrenceConstraint
    A constraint specifying the amount of times a substring should be present within the test subject. It can be created by invoking static methods Once, Twice, Thrice, or Times(int) on the classes FluentAssertions.Exactly, FluentAssertions.AtLeast, FluentAssertions.MoreThan, FluentAssertions.AtMost, and FluentAssertions.LessThan. For example, FluentAssertions.Exactly.Times or FluentAssertions.LessThan.Twice.
    because
    A formatted phrase as is supported by System.String.Format(System.String,System.Object[]) explaining why the assertion is needed. If the phrase does not start with the word because, it is prepended automatically.
    becauseArgs
    Zero or more objects to format using the placeholders in because.
    Exceptions
    ExceptionDescription
    System.ArgumentNullExceptionexpected is a null reference (Nothing in Visual Basic).
    System.ArgumentExceptionexpected is empty.
    Supported Frameworks

    .NET: net5.0, net5.0-windows, net6.0, net6.0-macos, net6.0-windows, net7.0, net7.0-macos, net7.0-windows, net8.0, net8.0-browser, net8.0-macos, net8.0-windows, net9.0, net9.0-browser, net9.0-macos, net9.0-windows, net10.0, net10.0-browser, net10.0-macos, net10.0-windows.

    .NET Standard: netstandard2.0, netstandard2.1.

    .NET Framework: net40, net403, net45, net451, net452, net46, net461, net462, net463, net47, net471, net472, net48, net481.

    See Also

    Reference

    StringAssertions<TAssertions> Class
    StringAssertions<TAssertions> Members
    Overload List

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