diff --git a/EasyTool.Core/RandomCategoty/RandomExtension.cs b/EasyTool.Core/RandomCategoty/RandomExtension.cs
new file mode 100644
index 0000000..3779261
--- /dev/null
+++ b/EasyTool.Core/RandomCategoty/RandomExtension.cs
@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace EasyTool.RandomCategoty
+{
+ public static class RandomExtension
+ {
+
+ ///
+ /// 返回四位数的正整数字符串
+ ///
+ ///
+ public static string FourNum() => RandomUtil.FourNum();
+
+ ///
+ /// 返回六位数的正整数字符串
+ ///
+ ///
+ public static string SixNum() => RandomUtil.SixNum();
+ ///
+ /// 返回位数区间内的数字字符串
+ ///
+ /// 左闭右开
+ ///
+ /// 最小位数
+ /// 最大位数
+ ///
+ /// 当<0，抛出异常
+ public static string RandomNum(this Tuple tuple) => RandomUtil.RandomNum(tuple.Item1, tuple.Item2);
+ ///
+ /// 返回区间内的数字字
+ ///
+ /// 左闭右开
+ ///
+ /// 最小数
+ /// 最大数
+ ///
+ public static int RandomInt(this Tuple tuple) => RandomUtil.RandomInt(tuple.Item1, tuple.Item2);
+ ///
+ /// 返回区间内指定个数随机数
+ /// 左闭右开
+ ///
+ ///
+ ///
+ /// 输出数量
+ ///
+ /// 当<0，抛出异常
+ public static List RandomNum(this Tuple tuple) => RandomUtil.RandomNum(tuple.Item1, tuple.Item2, tuple.Item3);
+
+ ///
+ /// 洗牌算法打乱List里面的顺序
+ ///
+ ///
+ ///
+ public static void Shuffle(this IList list) => RandomUtil.Shuffle(list);
+
+
+ ///
+ /// 返回列表里面确定数量的随机元素
+ ///
+ /// 源数据类型
+ /// 源数据列表
+ /// 需要返回数量
+ /// 是否需要不重复的数据
+ ///
+ ///
+ public static List GetRandomElements(this List sourceList, int needCount, bool needOnly = true) => RandomUtil.GetRandomElements(sourceList, needCount, needOnly);
+
+ }
+}
diff --git a/EasyTool.Core/RandomCategoty/RandomUtil.cs b/EasyTool.Core/RandomCategoty/RandomUtil.cs
new file mode 100644
index 0000000..1e5c68a
--- /dev/null
+++ b/EasyTool.Core/RandomCategoty/RandomUtil.cs
@@ -0,0 +1,163 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace EasyTool.RandomCategoty
+{
+ public static class RandomUtil
+ {
+ private static readonly Random _random = new();
+ ///
+ /// 返回四位数的正整数字符串
+ ///
+ ///
+ public static string FourNum()
+ {
+ return _random.Next(1000, 10000).ToString();
+ }
+ ///
+ /// 返回六位数的正整数字符串
+ ///
+ ///
+ public static string SixNum()
+ {
+ return _random.Next(1000000, 10000000).ToString();
+ }
+ ///
+ /// 返回位数区间内的数字字符串
+ ///
+ /// 左闭右开
+ ///
+ /// 最小位数
+ /// 最大位数
+ ///
+ /// 当<0，抛出异常
+ public static string RandomNum(int minBit, int maxBit)
+ {
+ if (minBit < 0)
+ {
+ throw new NotSupportedException("minBit参数错误");
+ }
+ int minValue = (int)Math.Pow(10, minBit);
+ int maxValue = (int)Math.Pow(10, maxBit);
+ return _random.Next(minValue, maxValue).ToString();
+ }
+ ///
+ /// 返回区间内的数字字
+ ///
+ /// 左闭右开
+ ///
+ /// 最小数
+ /// 最大数
+ ///
+ public static int RandomInt(int minValue, int maxValue)
+ {
+
+ return _random.Next(minValue, maxValue);
+ }
+ ///
+ /// 返回区间内指定个数随机数
+ /// 左闭右开
+ ///
+ ///
+ ///
+ /// 输出数量
+ ///
+ /// 当<0，抛出异常
+ public static List RandomNum(int minValue, int maxValue, int refCount)
+ {
+ var result = new List();
+ if (refCount < 0)
+ {
+ throw new NotSupportedException("refCount参数错误");
+ }
+ for (int i = 0; i < refCount; i++)
+ {
+ result.Add(_random.Next(minValue, maxValue));
+ }
+
+ return result;
+ }
+ ///
+ /// 洗牌算法打乱List里面的顺序
+ ///
+ ///
+ ///
+ public static void Shuffle(this IList list)
+ {
+ int n = list.Count;
+ while (n > 1)
+ {
+ n--;
+ int k = _random.Next(n + 1);
+ (list[n], list[k]) = (list[k], list[n]);
+ }
+ }
+
+ ///
+ /// 返回列表里面确定数量的随机元素
+ ///
+ /// 源数据类型
+ /// 源数据列表
+ /// 需要返回数量
+ /// 是否需要不重复的数据
+ ///
+ ///
+ public static List GetRandomElements(this List sourceList, int needCount, bool needOnly = true)
+ {
+ if (needCount<=0)
+ {
+ throw new NotSupportedException("needCount参数错误");
+ }
+ var length = sourceList.Count;
+ if (needOnly)
+ {
+ if (needCount >= length)
+ {
+ // 如果请求的元素数量大于等于列表的元素数量，返回整个列表
+ return new List(sourceList);
+ }
+
+ List resultList = new List(needCount);
+
+ HashSet selectedIndices = new HashSet();
+
+ while (needCount-- > 0)
+ {
+ int randomIndex = _random.Next(0, length);
+
+ // 如果该索引已经被选择过，则重新选择
+ if (selectedIndices.Contains(randomIndex))
+ {
+ continue;
+ }
+
+ resultList.Add(sourceList[randomIndex]);
+ selectedIndices.Add(randomIndex);
+ }
+
+ return resultList;
+ }
+ else
+ {
+
+ if (length <= 1)
+ {
+ return sourceList;
+ }
+ List resultList = new List(needCount);
+
+ for (int i = 0; i < needCount; i++)
+ {
+ int randomIndex = _random.Next(0, sourceList.Count);
+ resultList.Add(sourceList[randomIndex]);
+ }
+
+ return resultList;
+ }
+
+
+ }
+
+ }
+}