Method DeferredLastOrDefault

DeferredLastOrDefault<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 "LastOrDefault" 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<TSource> DeferredLastOrDefault<TSource>(this IQueryable<TSource> source)
    where TSource : class
Parameters
Type Name Description
IQueryable<TSource> source

An System.Linq.IQueryable`1 to return the last element of.
Returns
Type Description
QueryDeferred<TSource>

default(TSource) if source is empty; otherwise, the last element in source.
Type Parameters
Name Description
TSource

The type of the elements of source.

DeferredLastOrDefault<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 "LastOrDefault" 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<TSource> DeferredLastOrDefault<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate)
    where TSource : class
Parameters
Type Name Description
IQueryable<TSource> source

An System.Linq.IQueryable`1 to return an element from.
Expression<Func<TSource, System.Boolean>> predicate

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

default(TSource) if source is empty or if no elements pass the test in the predicate function; otherwise, the last element of source that passes the test in the predicate function.
Type Parameters
Name Description
TSource

The type of the elements of source.