Method DeferredCount

DeferredCount<TSource>(IQueryable<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 "Count" 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<int> DeferredCount<TSource>(this IQueryable<TSource> source)
Parameters
Type Name Description
IQueryable<TSource> source

The System.Linq.IQueryable`1 that contains the elements to be counted.
Returns
Type Description
QueryDeferred<System.Int32>

The number of elements in the input sequence.
Type Parameters
Name Description
TSource

The type of the elements of source.

DeferredCount<TSource>(IQueryable<TSource>, Expression<Func<TSource, Boolean>>)

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 "Count" 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<int> DeferredCount<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate)
Parameters
Type Name Description
IQueryable<TSource> source

An System.Linq.IQueryable`1 that contains the elements to be counted.
Expression<Func<TSource, System.Boolean>> predicate

A function to test each element for a condition.
Returns
Type Description
QueryDeferred<System.Int32>

The number of elements in the sequence that satisfies the condition in the predicate function.
Type Parameters
Name Description
TSource

The type of the elements of source.