Enumerable::ToDictionary<TSource, TKey> Method (IEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>)
Silverlight
Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function and key comparer.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the keys returned by keySelector.
Parameters
- source
- Type: System.Collections.Generic::IEnumerable<TSource>
An IEnumerable<T> to create a Dictionary<TKey, TValue> from.
- keySelector
- Type: System::Func<TSource, TKey>
A function to extract a key from each element.
- comparer
- Type: System.Collections.Generic::IEqualityComparer<TKey>
An IEqualityComparer<T> to compare keys.
Return Value
Type: System.Collections.Generic::Dictionary<TKey, TSource>A Dictionary<TKey, TValue> that contains keys and values.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. When you use instance method syntax to call this method, omit the first parameter.| Exception | Condition |
|---|---|
| ArgumentNullException | source or keySelector is nullptr. -or- keySelector produces a key that is nullptr. |
| ArgumentException | keySelector produces duplicate keys for two elements. |
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
Community Additions
ADD
Show: