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Fluent Assertions Documentation
FluentAssertions.Collections Namespace / GenericCollectionAssertions<TCollection,T,TAssertions> Class / OnlyHaveUniqueItems Method / OnlyHaveUniqueItems<TKey>(Expression<Func<T,TKey>>,String,Object[]) Method
The predicate to group the items by.
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
    OnlyHaveUniqueItems<TKey>(Expression<Func<T,TKey>>,String,Object[]) Method
    In This Topic
    Asserts that the collection does not contain any duplicate items.
    Syntax
    public AndConstraint<TAssertions> OnlyHaveUniqueItems<TKey>( 
   Expression<Func<T,TKey>> predicate,
   string because,
   params object[] becauseArgs
)

    Parameters

    predicate
    The predicate to group the items by.
    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.

    Type Parameters

    TKey
    Exceptions
    ExceptionDescription
    System.ArgumentNullExceptionpredicate is a null reference (Nothing in Visual Basic).
    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also

    Reference

    GenericCollectionAssertions<TCollection,T,TAssertions> Class
    GenericCollectionAssertions<TCollection,T,TAssertions> Members
    Overload List

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