29 lines
876 B
C#
29 lines
876 B
C#
|
using System.Collections.Concurrent;
|
||
|
|
using System.Collections.Generic;
|
||
|
|
|
||
|
|
namespace PCL.Core.Utils.Exts;
|
||
|
|
|
||
|
|
public static class ConcurrentDictionaryExtension
|
||
|
|
{
|
||
|
|
extension<TKey, TValue>(ConcurrentDictionary<TKey, TValue> dict) where TKey: notnull
|
||
|
|
{
|
||
|
|
public bool CompareAndRemove(TKey key,
|
||
|
|
TValue comparison) => ((ICollection<KeyValuePair<TKey, TValue>>)dict).Remove(new KeyValuePair<TKey, TValue>(key, comparison));
|
||
|
|
|
||
|
|
public TValue? UpdateAndGetPrevious(TKey key,
|
||
|
|
TValue value)
|
||
|
|
{
|
||
|
|
TValue? prevValue = default;
|
||
|
|
dict.AddOrUpdate(key, _ =>
|
||
|
|
{
|
||
|
|
prevValue = default;
|
||
|
|
return value;
|
||
|
|
}, (_, existingValue) =>
|
||
|
|
{
|
||
|
|
prevValue = existingValue;
|
||
|
|
return value;
|
||
|
|
});
|
||
|
|
return prevValue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|