{"id":430,"date":"2023-07-27T18:59:36","date_gmt":"2023-07-28T01:59:36","guid":{"rendered":"https:\/\/devblogs.microsoft.com\/dotnet-ch\/?p=430"},"modified":"2023-07-27T18:59:36","modified_gmt":"2023-07-28T01:59:36","slug":"c-12%e9%a2%84%e8%a7%88%e7%89%88%e7%9a%84%e6%96%b0%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/dotnet-ch\/c-12%e9%a2%84%e8%a7%88%e7%89%88%e7%9a%84%e6%96%b0%e5%8a%9f%e8%83%bd\/","title":{"rendered":"C# 12\u9884\u89c8\u7248\u7684\u65b0\u529f\u80fd"},"content":{"rendered":"

\u4f5c\u8005\uff1a Kathleen Dollard\u00a0 \u00a0 \u00a0\u539f\u6587\uff1aNew C# 12 preview features – .NET Blog (microsoft.com)<\/a><\/p>\n

Visual Studio 17.7 Preview 3 \u548c .NET 8 Preview 6 \u7684\u53d1\u5e03\u63a8\u8fdb\u4e86C# 12\u7684\u53d1\u5c55\u3002\u6b64\u9884\u89c8\u7248\u5305\u542b\u7684\u529f\u80fd\u4e3a\u5c06\u6765\u7684\u6027\u80fd\u589e\u5f3a\u5960\u5b9a\u4e86\u57fa\u7840\u3002\u73b0\u5728\uff0c\u60a8\u80fd\u591f\u5728\u5e93\u4e2d\u66f4\u65b9\u4fbf\u7684\u4f7f\u7528\u5185\u8054\u51fd\u6570\u3002\u6b64\u9884\u89c8\u7248\u9996\u6b21\u63a8\u51fa\u4e86\u4e00\u9879\u5b9e\u9a8c\u6027\u529f\u80fd\uff1a\u62e6\u622a\u5668\u3002\u8be5\u529f\u80fd\u5141\u8bb8\u751f\u6210\u5668\u91cd\u65b0\u8def\u7531\u4ee3\u7801\uff0c\u4f8b\u5982\u63d0\u4f9b\u7279\u5b9a\u4e8e\u4e0a\u4e0b\u6587\u7684\u4f18\u5316\u3002\u6700\u540e\uff0cnameof<\/span> \u529f\u80fd\u5f97\u5230\u589e\u5f3a\uff0c\u60a8\u53ef\u4ee5\u5728\u66f4\u591a\u7684\u5730\u65b9\u4f7f\u7528\u5b83\u3002<\/p>\n

\u5b89\u88c5\u6700\u65b0\u7684 Visual Studio \u9884\u89c8\u7248\u6216\u6700\u65b0\u7248\u672c\u7684 .NET SDK\u6765\u4f7f\u7528 C# 12 \u3002\u5c06\u9879\u76ee\u7684\u8bed\u8a00\u7248\u672c\u8bbe\u7f6e\u4e3apreview\uff0c\u5c31\u53ef\u67e5\u770b C# 12 \u7684\u529f\u80fd\uff1a<\/p>\n

<PropertyGroup><\/span>\r\n   <LangVersion><\/span>preview<\/span><\/LangVersion><\/span>\r\n<\/PropertyGroup><\/span><\/code><\/pre>\n
nameof <\/strong><\/span>\u8bbf\u95ee\u5b9e\u4f8b\u6210\u5458<\/strong><\/h3>\n
nameof<\/span>\u5173\u952e\u5b57\u73b0\u5728\u53ef\u7528\u4e8e\u6210\u5458\u540d\u79f0\uff0c\u5982\u521d\u59cb\u5316\u5668\u3001\u9759\u6001\u6210\u5458\u4ee5\u53ca\u5c5e\u6027\uff1a<\/p>\n
internal<\/span> class<\/span> NameOf<\/span>\r\n{<\/span>\r\n    public<\/span> string<\/span> S <\/span>{<\/span> get<\/span>;<\/span> }<\/span> =<\/span> \"\"<\/span>;<\/span>\r\n    public<\/span> static<\/span> int<\/span> StaticField<\/span>;<\/span>\r\n    public<\/span> string<\/span> NameOfLength<\/span> {<\/span> get<\/span>;<\/span> }<\/span> =<\/span> nameof<\/span>(<\/span>S<\/span>.<\/span>Length<\/span>);<\/span>\r\n    public<\/span> static<\/span> void<\/span> NameOfExamples<\/span>()<\/span>\r\n    {<\/span>\r\n        Console<\/span>.<\/span>WriteLine<\/span>(<\/span>nameof<\/span>(<\/span>S<\/span>.<\/span>Length<\/span>));<\/span>\r\n        Console<\/span>.<\/span>WriteLine<\/span>(<\/span>nameof<\/span>(<\/span>StaticField<\/span>.<\/span>MinValue<\/span>));<\/span>\r\n    }<\/span>\r\n    [<\/span>Description<\/span>(<\/span>$<\/span>\"String {nameof(S.Length)}\"<\/span>)]<\/span>\r\n    public<\/span> int<\/span> StringLength<\/span>(<\/span>string<\/span> s<\/span>)<\/span>\r\n    {<\/span> return<\/span> s<\/span>.<\/span>Length<\/span>;<\/span> }<\/span>\r\n}<\/span><\/code><\/pre>\n
\u5185\u8054\u6570\u7ec4<\/strong><\/h3>\n
InlineArrayAttribute<\/a> \u662f\u5728\u4ee5\u524d\u7684 .NET 8 \u9884\u89c8\u7248\u4e2d\u5f15\u5165\u5230\u8fd0\u884c\u65f6\u7684\u3002 \u8fd9\u662f\u4e00\u9879\u9ad8\u7ea7\u529f\u80fd\uff0c\u4e3b\u8981\u7531\u7f16\u8bd1\u5668\u3001.NET \u5e93\u548c\u5176\u4ed6\u4e00\u4e9b\u5e93\u4f7f\u7528\u3002 \u8be5\u5c5e\u6027\u6807\u8bc6\u4e86\u4e00\u79cd\u53ef\u88ab\u89c6\u4e3a\u8fde\u7eed\u57fa\u5143\u5e8f\u5217\u7684\u7c7b\u578b\uff0c\u4ee5\u5b9e\u73b0\u9ad8\u6548\u3001\u7c7b\u578b\u5b89\u5168\u3001\u8d8a\u754c\u5b89\u5168\u7684\u53ef\u7d22\u5f15\/\u53ef\u5207\u5206\u5185\u8054\u6570\u636e\u3002 .NET \u5e93\u4f7f\u7528\u5185\u8054\u6570\u7ec4\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u548c\u5de5\u5177\u7684\u6027\u80fd\u3002<\/p>\n
\u7f16\u8bd1\u5668\u521b\u5efa\u4e0d\u540c\u7684 IL \u6765\u8bbf\u95ee\u5185\u8054\u6570\u7ec4\u3002 \u8fd9\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u9650\u5236\uff0c\u4f8b\u5982\u4e0d\u652f\u6301\u5217\u8868\u6a21\u5f0f\u3002 \u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u50cf\u8bbf\u95ee\u5176\u4ed6\u6570\u7ec4\u4e00\u6837\u8bbf\u95ee\u5185\u8054\u6570\u7ec4\u3002 \u4e0d\u540c\u7684 IL \u53ef\u4ee5\u5728\u4e0d\u66f4\u6539\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u63d0\u9ad8\u6027\u80fd\uff1a<\/p>\n
private<\/span> static<\/span> void<\/span> InlineArrayAccess<\/span>(<\/span>Buffer10<\/span><int><\/span> inlineArray<\/span>)<\/span>\r\n{<\/span>\r\n    for<\/span> (<\/span>int<\/span> i <\/span>=<\/span> 0<\/span>;<\/span> i <\/span><<\/span> 10<\/span>;<\/span> i<\/span>++)<\/span>\r\n    {<\/span>\r\n        inlineArray<\/span>[<\/span>i<\/span>]<\/span> =<\/span> i <\/span>*<\/span> i<\/span>;<\/span>\r\n    }<\/span>\r\n    foreach<\/span> (<\/span>int<\/span> i <\/span>in<\/span> inlineArray<\/span>)<\/span>\r\n    {<\/span>\r\n        Console<\/span>.<\/span>WriteLine<\/span>(<\/span>i<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span><\/code><\/pre>\n
\u5bf9\u4e8e\u5185\u8054\u6570\u7ec4\uff0c\u5927\u591a\u6570\u4eba\u503e\u5411\u4e8e\u4f7f\u7528\uff0c\u800c\u4e0d\u662f\u521b\u5efa\u3002 \u4f46\u662f\uff0c\u4e86\u89e3\u4e8b\u7269\u7684\u8fd0\u4f5c\u65b9\u5f0f\u5927\u6709\u88e8\u76ca\u3002 \u5185\u8054\u6570\u7ec4\u901f\u5ea6\u5f88\u5feb\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f9d\u8d56\u4e8e\u6307\u5b9a\u957f\u5ea6\u7684\u7cbe\u786e\u5e03\u5c40\u3002 \u5185\u8054\u6570\u7ec4\u662f\u4e00\u79cd\u5177\u6709\u5355\u4e2a\u5b57\u6bb5\u7684\u7c7b\u578b\uff0c\u5e76\u7528\u6307\u5b9a\u6570\u7ec4\u957f\u5ea6\u7684 InlineArrayAttribute<\/span> \u8fdb\u884c\u6807\u8bb0\u3002 \u5728\u4e0a\u4e00\u4e2a\u793a\u4f8b\u4e2d\u4f7f\u7528\u7684\u7c7b\u578b\u4e2d\uff0c\u7531\u4e8e\u5c5e\u6027\u53c2\u6570\uff0c\u8fd0\u884c\u65f6\u4f1a\u5728 Buffer10<T><\/span> \u4e2d\u4e3a10\u4e2a\u5143\u7d20\u521b\u5efa\u5b58\u50a8\u7a7a\u95f4\uff1a<\/p>\n
[<\/span>System<\/span>.<\/span>Runtime<\/span>.<\/span>CompilerServices<\/span>.<\/span>InlineArray<\/span>(<\/span>10<\/span>)]<\/span>\r\npublic<\/span> struct<\/span> Buffer10<\/span><<\/span>T<\/span>><\/span>\r\n{<\/span>\r\n    private<\/span> T _element0<\/span>;<\/span>\r\n}<\/span><\/code><\/pre>\n
\u62e6\u622a\u5668<\/strong><\/h3>\n
\u6b64\u9884\u89c8\u7248\u5f15\u5165\u4e86\u4e00\u9879\u540d\u4e3a\u62e6\u622a\u5668\u7684\u5b9e\u9a8c\u6027\u529f\u80fd\u3002\u5b83\u9002\u7528\u4e8e\u4e00\u4e9b\u9ad8\u7ea7\u573a\u666f\uff0c\u7279\u522b\u662f\u5141\u8bb8\u66f4\u597d\u7684\u63d0\u524d\u7f16\u8bd1\uff08AOT\uff09\u3002\u4f5c\u4e3a .NET 8 \u7684\u5b9e\u9a8c\u90e8\u5206\uff0c\u5728\u672a\u6765\u7248\u672c\u4e2d\u5b83\u53ef\u80fd\u4f1a\u88ab\u66f4\u6539\u6216\u5220\u9664\u3002\u56e0\u6b64\uff0c\u5148\u4e0d\u8981\u5728\u751f\u4ea7\u4e2d\u4f7f\u7528\u8fd9\u9879\u529f\u80fd\u3002<\/p>\n
\u62e6\u622a\u5668\u5141\u8bb8\u5c06\u7279\u5b9a\u65b9\u6cd5\u8c03\u7528\u91cd\u65b0\u8def\u7531\u5230\u4e0d\u540c\u7684\u4ee3\u7801\u3002\u5c5e\u6027\u6307\u5b9a\u5b9e\u9645\u7684\u6e90\u4ee3\u7801\u4f4d\u7f6e\uff0c\u56e0\u6b64\u62e6\u622a\u5668\u901a\u5e38\u4ec5\u9002\u7528\u4e8e\u6e90\u751f\u6210\u5668\u3002\u60a8\u53ef\u4ee5\u9605\u8bfb\u62e6\u622a\u5668\u63d0\u6848<\/a>\u4ee5\u4e86\u89e3\u6709\u5173\u62e6\u622a\u5668\u5982\u4f55\u5de5\u4f5c\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n
\u7531\u4e8e\u62e6\u622a\u5668\u662f\u4e00\u9879\u5b9e\u9a8c\u6027\u529f\u80fd\uff0c\u56e0\u6b64\u60a8\u9700\u8981\u5728\u9879\u76ee\u6587\u4ef6\u4e2d\u663e\u5f0f\u542f\u7528\u5b83\u4eec\uff1a<\/p>\n
<PropertyGroup><\/span>\r\n   <Features><\/span>InterceptorsPreview<\/span><\/Features><\/span>\r\n<\/PropertyGroup><\/span><\/code><\/pre>\n
\u62e6\u622a\u5668\u53ef\u4ee5\u5b9e\u73b0\u7edd\u4f73\u7684\u4ee3\u7801\u6a21\u5f0f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f8b\u5b50\uff1a<\/p>\n
\u60a8\u53ef\u4ee5\u5728C# 12\u7684\u65b0\u589e\u529f\u80fd<\/a>\u4e2d\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u5728C# 12 \u7684\u65b0\u589e\u529f\u80fd<\/a>\u4e2d\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n
\u7531\u4e8e\u8fd9\u662f\u5b9e\u9a8c\u6027\u7684\u529f\u80fd\uff0c\u6240\u4ee5\u62e6\u622a\u5668\u9700\u8981\u5728\u9879\u76ee\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u9644\u52a0\u6807\u5fd7<\/a>\u3002<\/p>\n