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+## 创建项目
+```
+dotnet new console
+```
+
+## 题目1
+```c#
+// 筛选偶数，并从大到小排序
+var lst = new List<int>(){1,2,3,4,5,6,7,8,9,0}; 
+```
+## 答案
+```c#
+//方式1 使用类sql查询语句进行查询
+IEnumerable<int> result = 
+from e in lst 
+where e % 2 == 0 
+orderby e descending
+select e;
+
+Console.WriteLine(JsonSerializer.Serialize(result));
+```
+![样图](.\\imgs\\1684743458251.png)
+
+```c#
+// 方式2 扩展写法
+IEnumerable<int> result = 
+lst.where(e=>e%2==0)
+.OrderByDescending(e=>e)
+.select(e=>e);
+```
+
+## 题目2
+
+## 答案1
+```c#
+///统计随机数出现的次数。
+var rnd = new Random(1000);
+var arr = Enumerable.Range(0,100).Select(_ => rnd.Next(0,10));
+
+//定义计数数组
+int[] counts = new int[100];
+foreach(var e in arr){
+    counts[e]++;
+}
+
+for (int i = 0; i < counts.Length; i++)
+{
+    if(counts[i] != 0){
+        System.Console.WriteLine($"字符{i}出现了--{counts[i]}--次");
+    }
+}
+//输出结果
+
+```
+## 答案2
+```c#
+//通过linq语句将集合通过数值分组
+//通过select语句返回一个含有num和count属性的匿名类型
+let result = arr.GroupBy(e=>e).Select(e=> new {Num=e.Key,Count=e.Count()});
+//遍历输出
+foreach(var e in result){
+    Console.WriteLine($"{e.Num}出现了：{e.Count}次");
+}
+
+```
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