using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Text;
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using System.Threading.Tasks;
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namespace FlexJobApi.Core
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{
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public static class CollectionUtils
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{
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/// <summary>
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/// 去重添加
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/// </summary>
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/// <typeparam name="T">泛型对象</typeparam>
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/// <param name="list">集合</param>
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/// <param name="item">需添加的项</param>
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/// <param name="comparer">比较</param>
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/// <returns>集合</returns>
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public static List<T> DistinctAdd<T>(this List<T> list, T item, IEqualityComparer<T> comparer = null)
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{
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if (list == null) return new List<T> { item };
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if (!list.Contains(item, comparer)) list.Add(item);
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return list;
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}
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public static List<TResult> DistinctSelect<TSource, TResult>(this IEnumerable<TSource> list, Func<TSource, TResult> selector)
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{
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return list.Select(selector).Distinct().ToList();
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}
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public static List<TResult> DistinctSelect<TSource, TResult>(this IEnumerable<TSource> list, Func<TSource, bool> predicate, Func<TSource, TResult> selector)
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{
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return list.Where(predicate).Select(selector).Distinct().ToList();
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}
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public static string SplitJoin(this IEnumerable<string> list, string split)
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{
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list = list.DistinctSelect(it => it.IsNotNull(), it => it);
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return string.Join(split, list);
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}
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public static string SplitJoin<T>(this IEnumerable<T> list, Func<T, string> selector, string split)
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{
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return list.Select(selector).SplitJoin(split);
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}
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public static string SplitJoin<T>(this IEnumerable<T> list, Func<T, bool> predicate, Func<T, string> selector, string split)
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{
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return list.Where(predicate).Select(selector).SplitJoin(split);
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}
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public static bool IsNull<T>(this T[] list)
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{
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return list == null || list.Length == 0;
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}
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public static bool IsNotNull<T>(this T[] list)
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{
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return !list.IsNull();
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}
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public static bool IsNull<T>(this List<T> list)
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{
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return list == null || list.Count == 0;
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}
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public static bool IsNotNull<T>(this List<T> list)
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{
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return !list.IsNull();
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}
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}
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}
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