Class GroupedQuery<TKey, TSource>

Namespace

CL.MySQL2.Services

Assembly

CL.MySQL2.dll

Intermediate query produced by GroupBy<TKey>(Expression<Func<T, TKey>>). Not directly executable — the only exit is Select<TResult>(Expression<Func<IGrouping<TKey, TSource>, TResult>>) which collapses the groups back into a shaped result set. Calls inside the projection lambda (g.Sum, g.Average, g.Count, g.Key, …) translate to SQL aggregates against the current GROUP BY.

public sealed class GroupedQuery<TKey, TSource> where TSource : class, new()

Type Parameters

TKey

TSource

Inheritance

object

GroupedQuery<TKey, TSource>

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Methods

Select<TResult>(Expression<Func<IGrouping<TKey, TSource>, TResult>>)

Collapse groups into a shaped result. Inside projection, use g.Key to reference the grouping key and g.Sum/Average/Min/Max/Count/Any to aggregate rows. Everything translates to SQL — rows aren't materialized into TSource first.

public ProjectedQuery<TSource, TResult> Select<TResult>(Expression<Func<IGrouping<TKey, TSource>, TResult>> projection)

Parameters

projection Expression<Func<IGrouping<TKey, TSource>, TResult>>

Returns

ProjectedQuery<TSource, TResult>

Type Parameters

TResult