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using System; using System.Collections.Generic; using System.Linq;
namespace SqlSugar { public class UtilRandom { public static Random Random = new Random(); public static int GetRandomIndex(Dictionary<int, int> pars) { var maxValue = 0; foreach (var item in pars) { maxValue += item.Value; } var num = Random.Next(1, maxValue); var result = 0; var endValue = 0; foreach (var item in pars) { var index = pars.ToList().IndexOf(item); var beginValue = index == 0 ? 0 : pars[index - 1]; endValue += item.Value; result = item.Key; if (num >= beginValue && num <= endValue) break; } return result; } } }
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