TEnumerable.ToDictionary<TSource,TKey,TElement> Method
Overloads
| ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>) |
Creates a dictionary from a sequence according to a specified key selector function. |
| ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>) |
Creates a dictionary from a sequence according to a specified key selector function and key comparer. |
| ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>) |
Creates a dictionary from a sequence according to specified key selector and element selector functions. |
| ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>) |
Creates a dictionary from a sequence according to specified key selector and element selector functions. |
Creates a dictionary from a sequence according to a specified key selector function.
class function ToDictionary<TSource,TKey>(const source: IEnumerable<TSource>; const keySelector: Func<TSource, TKey>): IOrderedDictionary<TKey,TSource>Type Parameters
- TSource
The type of the elements of source .
- TKey
The type of the key returned by keySelector .
Parameters
- source
- IEnumerable<TSource>
A sequence to create a dictionary from.
- keySelector
- Func<TSource, TKey>
A function to extract a key from each element.
Returns
A dictionary that contains keys and values. The values within each group are in the same order as in source.
Exceptions
source or keySelector is nil .
keySelector produces duplicate keys for two elements.
Creates a dictionary from a sequence according to a specified key selector function and key comparer.
class function ToDictionary<TSource,TKey>(const source: IEnumerable<TSource>; const keySelector: Func<TSource, TKey>; const comparer: IEqualityComparer<TKey>): IOrderedDictionary<TKey,TSource>Type Parameters
- TSource
The type of the elements of source .
- TKey
The type of the key returned by keySelector .
Parameters
- source
- IEnumerable<TSource>
A sequence to create a dictionary from.
- keySelector
- Func<TSource, TKey>
A function to extract a key from each element.
- comparer
- IEqualityComparer<TKey>
An equality comparer to compare keys.
Returns
A dictionary that contains keys and values. The values within each group are in the same order as in source.
Exceptions
source or keySelector is nil .
keySelector produces duplicate keys for two elements.
Remarks
If comparer is nil , the default equality comparer is
used to compare keys.
ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
Creates a dictionary from a sequence according to specified key selector and element selector functions.
class function ToDictionary<TSource,TKey,TElement>(const source: IEnumerable<TSource>; const keySelector: Func<TSource, TKey>; const elementSelector: Func<TSource, TElement>): IOrderedDictionary<TKey,TElement>Type Parameters
- TSource
The type of the elements of source .
- TKey
The type of the key returned by keySelector .
- TElement
The type of the value returned by elementSelector .
Parameters
- source
- IEnumerable<TSource>
A sequence to create a dictionary from.
- keySelector
- Func<TSource, TKey>
A function to extract a key from each element.
- elementSelector
- Func<TSource, TElement>
A transform function to produce a result element value from each element.
Returns
A dictionary that contains values of type TElement selected
from the input sequence.
Exceptions
source or keySelector or elementSelector is nil .
keySelector produces duplicate keys for two elements.
ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
Creates a dictionary from a sequence according to specified key selector and element selector functions.
class function ToDictionary<TSource,TKey,TElement>(const source: IEnumerable<TSource>; const keySelector: Func<TSource, TKey>; const elementSelector: Func<TSource, TElement>; const comparer: IEqualityComparer<TKey>): IOrderedDictionary<TKey,TElement>Type Parameters
- TSource
The type of the elements of source .
- TKey
The type of the key returned by keySelector .
- TElement
The type of the value returned by elementSelector .
Parameters
- source
- IEnumerable<TSource>
A sequence to create a dictionary from.
- keySelector
- Func<TSource, TKey>
A function to extract a key from each element.
- elementSelector
- Func<TSource, TElement>
A transform function to produce a result element value from each element.
- comparer
- IEqualityComparer<TKey>
An equality comparer to compare keys.
Returns
A dictionary that contains values of type TElement selected
from the input sequence.
Exceptions
source or keySelector or elementSelector is nil .
keySelector produces duplicate keys for two elements.
Remarks
If comparer is nil , the default equality comparer is
used to compare keys.