c# - 如何将字符串数组转换为数组

Question

我有字符串:["gm-63.pdf","GM413.pdf","mh524.pdf"]如何使用 C# 将上述字符串转换为字符串数组？

Answer 1

可能有很多方法可以做到这一点。

选项 1

var input = @"[""gm-63.pdf"",""GM413.pdf"",""mh524.pdf""]";
var result = input.Trim('[', ']')
                  .Split(",")
                  .Select(x => x.Trim('"'))
                  .ToArray();

.Net 4.5 demo here

更新

Windows 禁止的文件名字符:

< (less than)
> (greater than)
: (colon - sometimes works, but is actually NTFS Alternate Data Streams)
" (double quote)
/ (forward slash)
\ (backslash)
| (vertical bar or pipe)
? (question mark)
* (asterisk)

如果这些是有效的文件名，双引号应该没有问题，但逗号可能是个问题。

所以谨慎使用

选项 2

您也可以使用 Json.Net 包。 Relevant documentation here

return JsonConvert.DeserializeObject<string[]>(Input);

基准

只是因为我很无聊，所以打开了我的基准测试器

所有测试都被垃圾收集，结果按操作缩放

----------------------------------------------------------------------------
Mode             : Release (64Bit)
Test Framework   : .NET Framework 4.7.1 (CLR 4.0.30319.42000)
----------------------------------------------------------------------------
Operating System : Microsoft Windows 10 Pro
Version          : 10.0.17134
----------------------------------------------------------------------------
CPU Name         : Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
Description      : Intel64 Family 6 Model 42 Stepping 7
Cores (Threads)  : 4 (8)      : Architecture  : x64
Clock Speed      : 3401 MHz   : Bus Speed     : 100 MHz
L2Cache          : 1 MB       : L3Cache       : 8 MB
----------------------------------------------------------------------------

测试 1

--- Standard input ---------------------------------------------------------
| Value |    Average |    Fastest |   Cycles |   Garbage | Test |     Gain |
--- Scale 10 ------------------------------------------------ Time 0.257 ---
| Split | 519.472 ns | 390.200 ns |  2.063 K | 811.776 B | Base |   0.00 % |
| Json  | 914.331 ns | 810.500 ns |  3.419 K | 819.200 B | N/A  | -76.01 % |
--- Scale 100 ----------------------------------------------- Time 0.061 ---
| Split | 216.935 ns | 141.090 ns | 769.172  | 327.680 B | Base |   0.00 % |
| Json  | 326.246 ns | 237.150 ns |  1.147 K | 163.840 B | N/A  | -50.39 % |
--- Scale 1,000 --------------------------------------------- Time 0.101 ---
| Split | 126.233 ns | 112.272 ns | 433.772  | 256.176 B | Base |   0.00 % |
| Json  | 186.400 ns | 166.907 ns | 638.003  |  81.968 B | N/A  | -47.66 % |
--- Scale 10,000 -------------------------------------------- Time 0.456 ---
| Split | 114.009 ns | 106.419 ns | 388.291  | 263.059 B | Base |   0.00 % |
| Json  | 168.608 ns | 154.450 ns | 574.312  |  82.574 B | N/A  | -47.89 % |
--- Scale 100,000 ------------------------------------------- Time 5.545 ---
| Json  | 206.117 ns | 199.416 ns | 701.200  |  75.731 B | N/A  |  24.02 % |
| Split | 271.281 ns | 257.446 ns | 810.403  | 144.212 B | Base |   0.00 % |
----------------------------------------------------------------------------

总结

如您所见，JsonConvert 一开始速度较慢，但​​它的扩展性很好，它还可以避免转义问题(如前所述)，您或许应该使用它。它的代码也更少。

祝你好运