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https://github.com/oliverbooth/X10D
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Add Random.NextString(IReadOnlyList<char>, int)
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@ -1,6 +1,7 @@
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace X10D.RandomExtensions
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{
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@ -97,5 +98,57 @@ namespace X10D.RandomExtensions
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return list[random.Next(list.Count)];
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}
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/// <summary>
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/// Returns a new string of a specified length which is composed of specified characters.
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/// </summary>
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/// <param name="random">The <see cref="System.Random" /> instance.</param>
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/// <param name="source">The source collection of characters to poll.</param>
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/// <param name="length">The length of the new string to generate.</param>
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/// <returns>
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/// A <see cref="string" /> whose length is equal to that of <paramref name="length" />, composed of characters
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/// specified by the characters in <paramref name="source" />.
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/// </returns>
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/// <exception cref="ArgumentNullException">
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/// <paramref name="random" /> is <see langword="null" />.
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/// -or-
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/// <paramref name="source" /> is <see langword="null" />.
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/// </exception>
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/// <exception cref="ArgumentOutOfRangeException"><paramref name="length" /> is less than 0.</exception>
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public static string NextString(this Random random, IReadOnlyList<char> source, int length)
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{
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if (random is null)
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{
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throw new ArgumentNullException(nameof(random));
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}
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if (source is null)
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{
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throw new ArgumentNullException(nameof(source));
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}
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if (length < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(length), ExceptionMessages.LengthMustBePositiveValue);
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}
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if (length == 0)
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{
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return string.Empty;
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}
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if (length == 1)
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{
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return source[random.Next(0, source.Count)].ToString();
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}
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var builder = new StringBuilder(length);
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for (var i = 0; i < length; i++)
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{
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builder.Append(source[random.Next(0, source.Count)]);
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}
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return builder.ToString();
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}
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}
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}
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