69 lines
3.5 KiB
C#
69 lines
3.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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namespace JiShe.CollectBus.Common.Extensions
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{
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/// <summary>
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/// Extension methods for <see cref="IEnumerable{T}"/>.
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/// </summary>
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public static class EnumerableExtensions
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{
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/// <summary>
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/// Concatenates the members of a constructed <see cref="IEnumerable{T}"/> collection of type System.String, using the specified separator between each member.
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/// This is a shortcut for string.Join(...)
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/// </summary>
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/// <param name="source">A collection that contains the strings to concatenate.</param>
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/// <param name="separator">The string to use as a separator. separator is included in the returned string only if values has more than one element.</param>
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/// <returns>A string that consists of the members of values delimited by the separator string. If values has no members, the method returns System.String.Empty.</returns>
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[Description("Enumerable转换String")]
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public static string JoinAsString(this IEnumerable<string> source, string separator)
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{
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return string.Join(separator, source);
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}
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/// <summary>
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/// Concatenates the members of a collection, using the specified separator between each member.
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/// This is a shortcut for string.Join(...)
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/// </summary>
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/// <param name="source">A collection that contains the objects to concatenate.</param>
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/// <param name="separator">The string to use as a separator. separator is included in the returned string only if values has more than one element.</param>
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/// <typeparam name="T">The type of the members of values.</typeparam>
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/// <returns>A string that consists of the members of values delimited by the separator string. If values has no members, the method returns System.String.Empty.</returns>
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public static string JoinAsString<T>(this IEnumerable<T> source, string separator)
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{
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return string.Join(separator, source);
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}
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/// <summary>
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/// Filters a <see cref="IEnumerable{T}"/> by given predicate if given condition is true.
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/// </summary>
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/// <param name="source">Enumerable to apply filtering</param>
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/// <param name="condition">A boolean value</param>
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/// <param name="predicate">Predicate to filter the enumerable</param>
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/// <returns>Filtered or not filtered enumerable based on <paramref name="condition"/></returns>
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[Description("Enumerable筛选")]
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public static IEnumerable<T> WhereIf<T>(this IEnumerable<T> source, bool condition, Func<T, bool> predicate)
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{
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return condition
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? source.Where(predicate)
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: source;
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}
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/// <summary>
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/// Filters a <see cref="IEnumerable{T}"/> by given predicate if given condition is true.
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/// </summary>
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/// <param name="source">Enumerable to apply filtering</param>
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/// <param name="condition">A boolean value</param>
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/// <param name="predicate">Predicate to filter the enumerable</param>
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/// <returns>Filtered or not filtered enumerable based on <paramref name="condition"/></returns>
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public static IEnumerable<T> WhereIf<T>(this IEnumerable<T> source, bool condition, Func<T, int, bool> predicate)
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{
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return condition
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? source.Where(predicate)
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: source;
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}
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}
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}
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