-
dotnet-framework-api
- C1.Data.Entity.4.8 Assembly
-
C1.LiveLinq.4.8 Assembly
- C1.LiveLinq
- C1.LiveLinq.AdoNet
- C1.LiveLinq.Collections
- C1.LiveLinq.Indexing
- C1.LiveLinq.Indexing.Search
- C1.LiveLinq.Listeners
- C1.LiveLinq.LiveViews
- C1.LiveLinq.LiveViews.Xml
- C1.WPF.LiveLinq
- C1.Win.Data.Entity.4.8 Assembly
C1.LiveLinq.LiveViews.View-1.GroupBy
GroupBy Method
GroupBy<TKey>(Expression<Func<T, TKey>>)
Groups the elements of a view according to a specified key selector function.
Declaration
public View<GroupView<TKey, T>> GroupBy<TKey>(Expression<Func<T, TKey>> keySelector)Parameters
| Type | Name | Description |
|---|---|---|
| Expression<Func<T, TKey>> | keySelector | A function to extract the key for each element. |
Returns
| Type | Description |
|---|---|
| View<GroupView<TKey, T>> | A view containing elements of type GroupView<TKey, TElement> each containing a key value and a view of the elements having that key value. |
Type Parameters
| Name | Description |
|---|---|
| TKey | The type of the key returned by keySelector. |
GroupBy<TKey, TElement>(Expression<Func<T, TKey>>, Expression<Func<T, TElement>>)
Groups the elements of a view according to a specified key selector function and projects the elements for each group by using a specified function.
Declaration
public View<GroupView<TKey, TElement>> GroupBy<TKey, TElement>(Expression<Func<T, TKey>> keySelector, Expression<Func<T, TElement>> elementSelector)Parameters
| Type | Name | Description |
|---|---|---|
| Expression<Func<T, TKey>> | keySelector | A function to extract the key for each element. |
| Expression<Func<T, TElement>> | elementSelector | A function to map each source element to a TElement. |
Returns
| Type | Description |
|---|---|
| View<GroupView<TKey, TElement>> | A view containing elements of type GroupView<TKey, TElement> each containing a key value and a view of the elements projected (mapped) from the elements having that key value. |
Type Parameters
| Name | Description |
|---|---|
| TKey | The type of the key returned by keySelector. |
| TElement | The type of the element to which elements of each group are projected. |
GroupBy<TKey, TElement, TResult>(Expression<Func<T, TKey>>, Expression<Func<T, TElement>>, Expression<Func<TKey, IEnumerable<TElement>, TResult>>)
Groups the elements of a view according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function.
Declaration
public View<TResult> GroupBy<TKey, TElement, TResult>(Expression<Func<T, TKey>> keySelector, Expression<Func<T, TElement>> elementSelector, Expression<Func<TKey, IEnumerable<TElement>, TResult>> resultSelector)Parameters
| Type | Name | Description |
|---|---|---|
| Expression<Func<T, TKey>> | keySelector | A function to extract the key for each element. |
| Expression<Func<T, TElement>> | elementSelector | A function to map each source element to an element in the IGrouping<TKey, TElement>. |
| Expression<Func<TKey, IEnumerable<TElement>, TResult>> | resultSelector | A function to create a result value from each group. |
Returns
| Type | Description |
|---|---|
| View<TResult> | A view of elements of type TResult where each element represents a projection over a group and its key. |
Type Parameters
| Name | Description |
|---|---|
| TKey | The type of the key returned by keySelector. |
| TElement | The type of the elements in groups. |
| TResult | The type of the result value returned by resultSelector. |