Method DeferredSingleOrDefault

DeferredSingleOrDefault<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 "SingleOrDefault" 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> DeferredSingleOrDefault<TSource>(this IQueryable<TSource> source)
Parameters
Type Name Description
IQueryable<TSource> source

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

The single element of the input sequence, or default(TSource) if the sequence contains no elements.
Type Parameters
Name Description
TSource

The type of the elements of source.

DeferredSingleOrDefault<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 "SingleOrDefault" 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> DeferredSingleOrDefault<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 a single element from.
Expression<Func<TSource, System.Boolean>> predicate

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

The single element of the input sequence that satisfies the condition in predicate.
Type Parameters
Name Description
TSource

The type of the elements of source.