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FrameWork/SqlSugar/Utilities/UtilRandom.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SqlSugar
+{
+    public class UtilRandom
+    {
+        public static Random Random = new Random();
+        public static int GetRandomIndex(Dictionary<int, int> pars)
+        {
+            int 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;
+        }
+    }
+}