Method DeferredAggregate

DeferredAggregate<TSource>(IQueryable<TSource>, Expression<Func<TSource, 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 "Aggregate" 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> DeferredAggregate<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, TSource, TSource>> func)
Parameters
Type Name Description
IQueryable<TSource> source

The System.Linq.IQueryable`1 that contains the elements to be counted.
Expression<Func<TSource, TSource, TSource>> func

An accumulator function to apply to each element.
Returns
Type Description
QueryDeferred<TSource>

The final accumulator value.
Type Parameters
Name Description
TSource

The type of the elements of source.

DeferredAggregate<TSource, TAccumulate>(IQueryable<TSource>, TAccumulate, Expression<Func<TAccumulate, TSource, TAccumulate>>)

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 "Aggregate" 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<TAccumulate> DeferredAggregate<TSource, TAccumulate>(this IQueryable<TSource> source, TAccumulate seed, Expression<Func<TAccumulate, TSource, TAccumulate>> func)
Parameters
Type Name Description
IQueryable<TSource> source

A sequence to aggregate over.
TAccumulate seed

The initial accumulator value.
Expression<Func<TAccumulate, TSource, TAccumulate>> func

An accumulator function to invoke on each element.
Returns
Type Description
QueryDeferred<TAccumulate>

The final accumulator value.
Type Parameters
Name Description
TSource

The type of the elements of source.
TAccumulate

The type of the accumulator value.

DeferredAggregate<TSource, TAccumulate, TResult>(IQueryable<TSource>, TAccumulate, Expression<Func<TAccumulate, TSource, TAccumulate>>, Expression<Func<TAccumulate, TResult>>)

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 "Aggregate" 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<TResult> DeferredAggregate<TSource, TAccumulate, TResult>(this IQueryable<TSource> source, TAccumulate seed, Expression<Func<TAccumulate, TSource, TAccumulate>> func, Expression<Func<TAccumulate, TResult>> selector)
Parameters
Type Name Description
IQueryable<TSource> source

A sequence to aggregate over.
TAccumulate seed

The initial accumulator value.
Expression<Func<TAccumulate, TSource, TAccumulate>> func

An accumulator function to invoke on each element.
Expression<Func<TAccumulate, TResult>> selector

A function to transform the final accumulator value into the result value.
Returns
Type Description
QueryDeferred<TResult>

The transformed final accumulator value.
Type Parameters
Name Description
TSource

The type of the elements of source.
TAccumulate

The type of the accumulator value.
TResult

The type of the resulting value.