/// <summary>
/// 安全的转换成字典集
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TElement"></typeparam>
/// <param name="source"></param>
/// <param name="keySelector">键选择器</param>
/// <param name="elementSelector">值选择器</param>
/// <returns></returns>
public static async Task <NullableConcurrentDictionary <TKey, TElement> > ToDictionarySafetyAsync <TSource, TKey, TElement>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, Task <TElement> > elementSelector)
{
var dic = new NullableConcurrentDictionary <TKey, TElement>();
await source.ForeachAsync(async item => dic[keySelector(item)] = await elementSelector(item));
return(dic);
}
/// <summary>
/// 添加或更新键值对
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="this"></param>
/// <param name="that">另一个字典集</param>
/// <returns></returns>
public static void AddOrUpdate <TKey, TValue>(this NullableConcurrentDictionary <TKey, TValue> @this, IDictionary <TKey, TValue> that)
{
foreach (var item in that)
{
@this[item.Key] = item.Value;
}
}
/// <summary>
/// 安全的转换成字典集
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TElement"></typeparam>
/// <param name="source"></param>
/// <param name="keySelector">键选择器</param>
/// <param name="elementSelector">值选择器</param>
/// <param name="defaultValue">键未找到时的默认值</param>
/// <returns></returns>
public static async Task <NullableConcurrentDictionary <TKey, TElement> > ToConcurrentDictionaryAsync <TSource, TKey, TElement>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, Task <TElement> > elementSelector, TElement defaultValue)
{
var dic = new NullableConcurrentDictionary <TKey, TElement>()
{
FallbackValue = defaultValue
};
await source.ForeachAsync(async item => dic[keySelector(item)] = await elementSelector(item));
return(dic);
}
/// <summary>
/// 安全的转换成字典集
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TElement"></typeparam>
/// <param name="source"></param>
/// <param name="keySelector">键选择器</param>
/// <param name="elementSelector">值选择器</param>
/// <returns></returns>
public static NullableConcurrentDictionary <TKey, TElement> ToConcurrentDictionary <TSource, TKey, TElement>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, TElement> elementSelector)
{
var dic = new NullableConcurrentDictionary <TKey, TElement>();
foreach (var item in source)
{
dic[keySelector(item)] = elementSelector(item);
}
return(dic);
}
/// <summary>
/// 转换成并发字典集合
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="dic"></param>
/// <param name="defaultValue">键未找到时的默认值</param>
/// <returns></returns>
public static NullableConcurrentDictionary <TKey, TValue> AsConcurrentDictionary <TKey, TValue>(this Dictionary <TKey, TValue> dic, TValue defaultValue)
{
var nullableDictionary = new NullableConcurrentDictionary <TKey, TValue>()
{
FallbackValue = defaultValue
};
foreach (var p in dic)
{
nullableDictionary[p.Key] = p.Value;
}
return(nullableDictionary);
}
/// <summary>
/// 安全的转换成字典集
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TKey"></typeparam>
/// <param name="source"></param>
/// <param name="keySelector">键选择器</param>
/// <param name="defaultValue">键未找到时的默认值</param>
/// <returns></returns>
public static NullableConcurrentDictionary <TKey, TSource> ToConcurrentDictionary <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, TSource defaultValue)
{
var dic = new NullableConcurrentDictionary <TKey, TSource>()
{
FallbackValue = defaultValue
};
foreach (var item in source)
{
dic[keySelector(item)] = item;
}
return(dic);
}