Method DeferredFirst

DeferredFirst<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 "First" 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> DeferredFirst<TSource>(this IQueryable<TSource> source)
Parameters
Type Name Description
IQueryable<TSource> source

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

The first element in source.
Type Parameters
Name Description
TSource

The type of the elements of source.

DeferredFirst<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 "First" 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> DeferredFirst<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>

The first element in source that passes the test in predicate.
Type Parameters
Name Description
TSource

The type of the elements of source.