Method DeferredContains

DeferredContains<TSource>(IQueryable<TSource>, TSource)

This method is the deferred implementation of the extension method . In EF some linq operations are performed on the client end instead of the server. Therefore, if we use the regular method it will cache the data from the database before performing the actual "Contains" operation. To cater to this, we provide with a deferred implementation that delays the caching so that only the result can be cached.

Declaration
public static QueryDeferred<bool> DeferredContains<TSource>(this IQueryable<TSource> source, TSource item)
Parameters
Type Name Description
IQueryable<TSource> source

An System.Linq.IQueryable`1 in which to locate item.
TSource item

The object to locate in the sequence.
Returns
Type Description
QueryDeferred<System.Boolean>

true if the input sequence contains an element that has the specified value; otherwise, false.
Type Parameters
Name Description
TSource

The type of the elements of source.

DeferredContains<TSource>(IQueryable<TSource>, TSource, IEqualityComparer<TSource>)

This method is the deferred implementation of the extension method . In EF some linq operations are performed on the client end instead of the server. Therefore, if we use the regular method it will cache the data from the database before performing the actual "Contains" operation. To cater to this, we provide with a deferred implementation that delays the caching so that only the result can be cached.

Declaration
public static QueryDeferred<bool> DeferredContains<TSource>(this IQueryable<TSource> source, TSource item, IEqualityComparer<TSource> comparer)
Parameters
Type Name Description
IQueryable<TSource> source

An System.Linq.IQueryable`1 in which to locate item.
TSource item

The object to locate in the sequence.
IEqualityComparer<TSource> comparer

An System.Collections.Generic.IEqualityComparer`1 to compare values.
Returns
Type Description
QueryDeferred<System.Boolean>

true if the input sequence contains an element that has the specified value; otherwise, false.
Type Parameters
Name Description
TSource

The type of the elements of source.