Dictionary AddRange
Add an enumeration of items to a dictionary. There are times when you may want to simply add to a dictionary at different points in the pipe, instead of always creating it from a given set of entities This extension allows you to add items to a dictionary from a select statement, or some other enumerable.
Source
public static void AddRange<K, T, TI>(this IDictionary<K, T> target, IEnumerable<TI> source, Func<TI, K> key, Func<TI, T> selector, bool set = true)
{
source.ForEach(i =>
{
var dKey = key(i);
var dValue = selector(i);
if (set)
{
target[dKey] = dValue;
}
else
{
target.Add(key(i), selector(i));
}
});
}
Example
class Car
{
int Id {get;set;}
string Name {get;set;}
}
public void AddCars (IDictionary<int, string> carDictionary, Car[] cars)
{
carDictionary.AddRange(cars, c=> c.Id, c => c.Name);
}
public Enum Makers
{
Ford,
Chevy
}
public Car[] GetCars(Makers maker)
{
if (manufacturer == Makers.Ford)
{
return
new Car[]
{
new Car(1, "Ford Focus"),
new Car(2, "Ford Edge")
};
else {
//return some other cars
}
}
Dictionary<int,string> carsById = new Dictionary<int,string>();
var fords = GetCars(Makers.Ford);
//do something with fords
carsById.AddRange(fords);
var chevys = GetCars (Makers.Chevy);
//do something with chevys
carsById.AddRange(chevys);
//The alternative, without the extension method is something like:
fords.Union(chevys).ToDictionary(...);
//but there are times when you may want to simply add to a dictionary at different points in the pipe, instead of always creating it from a given set of entities
Author: Eric Robishaw
Submitted on: 23 okt. 2020
Language: csharp
Type: System.Collections.Generic.IDictionary
Views: 9425