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Fluent Assertions Documentation
[Root] / FluentAssertions Assembly / FluentAssertions.Primitives Namespace / ReferenceTypeAssertions<TSubject,TAssertions> Class / BeOfType Method / BeOfType(Type,String,Object[]) Method
The type that the subject is supposed to be.
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
    BeOfType(Type,String,Object[]) Method
    In This Topic
    Asserts that the object is of the expectedType.
    Syntax
    public AndConstraint<TAssertions> BeOfType( 
   Type expectedType,
   string because,
   params object[] becauseArgs
)

    Parameters

    expectedType
    The type that the subject is supposed to be.
    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.ArgumentNullExceptionexpectedType is a null reference (Nothing in Visual Basic).
    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

    ReferenceTypeAssertions<TSubject,TAssertions> Class
    ReferenceTypeAssertions<TSubject,TAssertions> Members
    Overload List

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