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QueryableExDistinctUntilChangedTSource, TKey Method (IQueryableTSource, ExpressionFuncTSource, TKey)
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) Version: 1.2.0.0
Syntax
C#
Copy
public static IQueryable<TSource> DistinctUntilChanged<TSource, TKey>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector
)

Parameters

source
Type: System.LinqIQueryableTSource
Source sequence.
keySelector
Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
Key selector.

Type Parameters

TSource
Source sequence element type.
TKey
Key type.

Return Value

Type: IQueryableTSource
Sequence without adjacent non-distinct elements.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryableTSource. 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).
See Also