From e65202d41168a6160817464e54875b1177c872d4 Mon Sep 17 00:00:00 2001
From: gengens <gengens@qq.com>
Date: Mon, 22 May 2023 16:47:56 +0800
Subject: [PATCH 1/2] =?UTF-8?q?=E7=AC=AC=E4=B8=80=E8=AF=BE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...2-\347\254\254\344\270\200\350\257\276.md" |  52 ++++++++++++++++++
 .../imgs/1684743458251.png"                   | Bin 0 -> 957 bytes
 2 files changed, 52 insertions(+)
 create mode 100644 "\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md"
 create mode 100644 "\346\233\276\345\273\272\344\270\234/imgs/1684743458251.png"

diff --git "a/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md" "b/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md"
new file mode 100644
index 0000000..d6173cb
--- /dev/null
+++ "b/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md"
@@ -0,0 +1,52 @@
+## 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
+```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
+
+```
diff --git "a/\346\233\276\345\273\272\344\270\234/imgs/1684743458251.png" "b/\346\233\276\345\273\272\344\270\234/imgs/1684743458251.png"
new file mode 100644
index 0000000000000000000000000000000000000000..b19a6952250c93a7fce643cff3a7efa2daa2ac99
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-- 
Gitee


From 3f24bcc48c61be88590af320f10251fc172db5da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=80=BF=E8=80=BFyer?= <2982017073@qq.com>
Date: Mon, 22 May 2023 21:31:49 +0800
Subject: [PATCH 2/2] 'addmethod'

---
 ...0230522-\347\254\254\344\270\200\350\257\276.md" | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git "a/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md" "b/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md"
index d6173cb..5b3445f 100644
--- "a/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md"
+++ "b/\346\233\276\345\273\272\344\270\234/20230522-\347\254\254\344\270\200\350\257\276.md"
@@ -30,6 +30,8 @@ lst.where(e=>e%2==0)
 ```
 
 ## 题目2
+
+## 答案1
 ```c#
 ///统计随机数出现的次数。
 var rnd = new Random(1000);
@@ -50,3 +52,14 @@ for (int i = 0; i < counts.Length; i++)
 //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");
+}
+
+```
-- 
Gitee