Returns consecutive distinct elements based on a key value by using the specified equality comparer to compare key values.

Namespace: System.Linq
Assembly: System.Interactive.Providers (in System.Interactive.Providers.dll)

public static IQueryable<TSource> DistinctUntilChanged<TSource, TKey>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector
)

Type: System.Linq.IQueryable<TSource>
Source sequence.

Type: System.Linq.Expressions.Expression<Func<TSource, TKey>>
Key selector.

Source sequence element type.

Key type.

Type: IQueryable<TSource>
Sequence without adjacent non-distinct elements.

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

QueryableEx Class
System.Linq Namespace