C#学习之路二（数组、集合）

红太狼 2022-04-24 13:40 288阅读 0赞

一、数组  
（1）一维数组  
声明：int\[\] array;  
初始化：int\[\] array=new int\[5\];  
![在这里插入图片描述][20190426151919315.png]  
初始化并赋值：int\[\] array=new int\[5\]\{1,2,3,4,5\};

![在这里插入图片描述][20190426152157949.png]  
![在这里插入图片描述][20190426152226374.png]  
（2）二维数组  
声明：int\[,\] array;  
初始化：int\[,\] array=new\[2,2\];  
初始化并赋值：int\[,\] array=new\[2,2\]\{ \{1,2\},\{3,4\}\};

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70]  
（3）动态二维数组  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 2]  
二、数组的操作  
（1）排序  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 3]

int[] array = new int[5] { 3,6, 8, 3, 2 };
    foreach (int value in array)
    {
         Console.WriteLine("array before={0}", value);
     }
     Console.WriteLine();
     Array.Sort(array);
     foreach (int value in array)
     {
         Console.WriteLine("array after={0}", value);
    }
     Console.WriteLine();
     Console.ReadLine();

![在这里插入图片描述][20190426154011692.png]  
三、ArrayList类  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 4]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 5]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 6]（1）添加  
Add方法：array.Add(value);  
Insert方法：array.Insert(index,value);  
(2)删除  
Clear方法：array.Cear();清楚所有数据；  
Remove方法：从ArrayList中移除特定对象的第一个匹配项：array.Remove(value)  
RemoveAt方法：从ArrayList中移除对应索引的匹配项：array.RemoveAt(index)  
RemoveRange方法：从ArrayList中移除特定范围内的匹配项：array.Remove(index,count)  
(3)遍历  
可以通过foreach遍历。  
(4)查找  
![在这里插入图片描述][20190426155807270.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 7]

[20190426151919315.png]: /images/20220214/d81e5651665a46439b81935043af332d.png
[20190426152157949.png]: /images/20220214/17af9b088f9442d19f850cf4f89d041e.png
[20190426152226374.png]: /images/20220214/356a6ec5e11e48f282ac91a1f407e2da.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 3]: /images/20220214/f57f7a9c052244d4a6adb085344f32b1.png
[20190426154011692.png]: /images/20220214/bfa4bfd74b0e4f1a900b8406e4281b19.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 4]: /images/20220214/ace3fcc7ec0849d8b16e12c429084f6a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20190426154336911.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ==,size_16,color_FFFFFF,t_70
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[20190426155807270.png]: /images/20220214/76b6a1f89aa54b8d9a4c630af27cbffa.png
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