{"id":40444,"date":"2023-07-30T15:33:48","date_gmt":"2023-07-30T07:33:48","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=40444"},"modified":"2023-07-30T15:33:49","modified_gmt":"2023-07-30T07:33:49","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88c%e7%9a%84sizeof%e8%bf%90%e7%ae%97%e7%ac%a6%e5%8f%aa%e8%83%bd%e5%9c%a8%e4%b8%8d%e5%ae%89%e5%85%a8%e4%b8%8a%e4%b8%8b%e6%96%87%e4%b8%ad%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/40444.html","title":{"rendered":"\u4e3a\u4ec0\u4e48C#\u7684sizeof\u8fd0\u7b97\u7b26\u53ea\u80fd\u5728\u4e0d\u5b89\u5168\u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528"},"content":{"rendered":"\n
\n

C#\u7684sizeof\u8fd0\u7b97\u7b26\u53ea\u80fd\u5728\u4e0d\u5b89\u5168\u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528\u7684\u539f\u56e0\uff1a\u4e00\u3001\u5185\u5b58\u5b89\u5168\u6027\uff1b\u4e8c\u3001\u5e73\u53f0\u4f9d\u8d56\u6027\uff1b\u4e09\u3001\u4e0d\u786e\u5b9a\u6027\uff1b\u56db\u3001\u5c40\u9650\u6027\uff1b\u4e94\u3001\u7c7b\u578b\u4e0d\u660e\u786e\uff1b\u516d\u3001\u4e0d\u652f\u6301\u5f15\u7528\u7c7b\u578b\u6210\u5458\u7b49\u3002\u5185\u5b58\u5b89\u5168\u6027\u662f\u6307\uff0c\u4f7f\u7528sizeof\u8fd0\u7b97\u7b26\u6d89\u53ca\u5230\u76f4\u63a5\u8bbf\u95ee\u5185\u5b58\u5927\u5c0f\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u53d7CLR\u7ba1\u7406\u7684\u5185\u5b58\u8bbf\u95ee\uff0c\u4ece\u800c\u7834\u574f\u4e86C#\u7684\u5185\u5b58\u5b89\u5168\u6027\u3002<\/p>\n<\/blockquote>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u4e00\u3001\u5185\u5b58\u5b89\u5168\u6027<\/h2>\n\n\n\n

C#\u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7684\u9ad8\u7ea7\u7f16\u7a0b\u8bed\u8a00\uff0c\u4e3a\u4e86\u63d0\u4f9b\u66f4\u9ad8\u7684\u5185\u5b58\u5b89\u5168\u4fdd\u969c\uff0cC#\u8fd0\u884c\u65f6\u73af\u5883\uff08CLR\uff09\u5bf9\u5185\u5b58\u7684\u8bbf\u95ee\u8fdb\u884c\u4e86\u4e25\u683c\u7684\u63a7\u5236\u3002\u4f7f\u7528sizeof\u8fd0\u7b97\u7b26\u6d89\u53ca\u5230\u76f4\u63a5\u8bbf\u95ee\u5185\u5b58\u5927\u5c0f\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u53d7CLR\u7ba1\u7406\u7684\u5185\u5b58\u8bbf\u95ee\uff0c\u4ece\u800c\u7834\u574f\u4e86C#\u7684\u5185\u5b58\u5b89\u5168\u6027\u3002<\/p>\n\n\n\n

\u4e8c\u3001\u5e73\u53f0\u4f9d\u8d56\u6027<\/h2>\n\n\n\n

C#\u7684sizeof\u8fd0\u7b97\u7b26\u5728\u7f16\u8bd1\u65f6\u6267\u884c\uff0c\u800c\u4e0d\u662f\u8fd0\u884c\u65f6\u6267\u884c\u3002\u56e0\u6b64\uff0c\u5b83\u53ef\u80fd\u53d7\u5230\u4e0d\u540c\u5e73\u53f0\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u5f71\u54cd\uff0c\u4e0d\u540c\u5e73\u53f0\u4e0a\u7684sizeof\u7ed3\u679c\u53ef\u80fd\u4e0d\u540c\u3002\u8fd9\u5c31\u4f7f\u5f97sizeof\u8fd0\u7b97\u7b26\u5728\u4e0d\u540c\u5e73\u53f0\u4e0a\u7684\u884c\u4e3a\u4e0d\u4e00\u81f4\uff0c\u4e0d\u5229\u4e8e\u4ee3\u7801\u7684\u8de8\u5e73\u53f0\u79fb\u690d\u3002<\/p>\n\n\n\n

\u4e09\u3001\u4e0d\u786e\u5b9a\u6027<\/h2>\n\n\n\n

\u7531\u4e8esizeof\u8fd0\u7b97\u7b26\u5728\u7f16\u8bd1\u65f6\u6267\u884c\uff0c\u5b83\u7684\u7ed3\u679c\u5728\u7f16\u8bd1\u65f6\u5c31\u5df2\u7ecf\u786e\u5b9a\uff0c\u5e76\u4e14\u4e0d\u4f1a\u6839\u636e\u8fd0\u884c\u65f6\u6570\u636e\u7684\u53d8\u5316\u800c\u53d8\u5316\u3002\u8fd9\u5c31\u5bfc\u81f4sizeof\u8fd0\u7b97\u7b26\u7684\u7ed3\u679c\u662f\u9759\u6001\u7684\uff0c\u65e0\u6cd5\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u8c03\u6574\uff0c\u9650\u5236\u4e86\u5176\u7075\u6d3b\u6027\u548c\u9002\u7528\u6027\u3002<\/p>\n\n\n\n

\u56db\u3001\u5c40\u9650\u6027<\/h2>\n\n\n\n

sizeof\u8fd0\u7b97\u7b26\u53ea\u80fd\u7528\u4e8e\u503c\u7c7b\u578b\uff08value types\uff09\uff0c\u4e0d\u80fd\u7528\u4e8e\u5f15\u7528\u7c7b\u578b\uff08reference types\uff09\u548c\u52a8\u6001\u5206\u914d\u7684\u6570\u636e\u3002\u5728C#\u4e2d\uff0c\u5f15\u7528\u7c7b\u578b\u662f\u901a\u8fc7\u5f15\u7528\u8fdb\u884c\u8bbf\u95ee\u7684\uff0c\u800csizeof\u8fd0\u7b97\u7b26\u9700\u8981\u76f4\u63a5\u8bbf\u95ee\u5185\u5b58\uff0c\u6240\u4ee5\u4e0d\u80fd\u7528\u4e8e\u5f15\u7528\u7c7b\u578b\u3002\u53e6\u5916\uff0c\u7531\u4e8esizeof\u8fd0\u7b97\u7b26\u5728\u7f16\u8bd1\u65f6\u6267\u884c\uff0c\u65e0\u6cd5\u83b7\u53d6\u52a8\u6001\u5206\u914d\u6570\u636e\uff08\u5982\u5806\u4e0a\u5206\u914d\u7684\u5bf9\u8c61\uff09\u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n

\u4e94\u3001\u7c7b\u578b\u4e0d\u660e\u786e<\/h2>\n\n\n\n

C#\u7684sizeof\u8fd0\u7b97\u7b26\u8981\u6c42\u64cd\u4f5c\u7684\u7c7b\u578b\u5fc5\u987b\u662f\u7f16\u8bd1\u65f6\u5df2\u77e5\u7684\uff0c\u800c\u4e0d\u80fd\u662f\u8fd0\u884c\u65f6\u52a8\u6001\u786e\u5b9a\u7684\u7c7b\u578b\u3002\u8fd9\u9650\u5236\u4e86sizeof\u8fd0\u7b97\u7b26\u7684\u7075\u6d3b\u6027\uff0c\u56e0\u4e3a\u6709\u65f6\u5019\u53ef\u80fd\u9700\u8981\u5728\u8fd0\u884c\u65f6\u6839\u636e\u6570\u636e\u7c7b\u578b\u7684\u53d8\u5316\u6765\u83b7\u53d6\u5176\u5927\u5c0f\u3002<\/p>\n\n\n\n

\u516d\u3001\u4e0d\u652f\u6301\u5f15\u7528\u7c7b\u578b\u6210\u5458<\/h2>\n\n\n\n

\u5982\u679c\u4e00\u4e2a\u503c\u7c7b\u578b\u4e2d\u5305\u542b\u5f15\u7528\u7c7b\u578b\u7684\u6210\u5458\uff08\u5982\u7c7b\u7684\u5b9e\u4f8b\uff09\uff0csizeof\u8fd0\u7b97\u7b26\u65e0\u6cd5\u8ba1\u7b97\u8fd9\u4e9b\u6210\u5458\u7684\u5927\u5c0f\u3002\u56e0\u4e3a\u5f15\u7528\u7c7b\u578b\u7684\u5927\u5c0f\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u800c\u4e0d\u662f\u5b9e\u9645\u5bf9\u8c61\u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u5728\u503c\u7c7b\u578b\u4e2d\u4f7f\u7528sizeof\u8fd0\u7b97\u7b26\u65e0\u6cd5\u51c6\u786e\u83b7\u53d6\u5f15\u7528\u7c7b\u578b\u6210\u5458\u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n

\u4e03\u3001\u4e0d\u652f\u6301\u81ea\u5b9a\u4e49\u7c7b\u578b<\/h2>\n\n\n\n

sizeof\u8fd0\u7b97\u7b26\u53ea\u80fd\u7528\u4e8eC#\u5185\u7f6e\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u4f8b\u5982int\u3001float\u3001char\u7b49\uff0c\u800c\u4e0d\u80fd\u7528\u4e8e\u81ea\u5b9a\u4e49\u7684\u7ed3\u6784\u4f53\u6216\u7c7b\u3002\u8fd9\u9650\u5236\u4e86sizeof\u8fd0\u7b97\u7b26\u7684\u9002\u7528\u8303\u56f4\uff0c\u65e0\u6cd5\u7528\u4e8e\u590d\u6742\u6570\u636e\u7ed3\u6784\u7684\u5927\u5c0f\u8ba1\u7b97\u3002<\/p>\n\n\n\n

\u516b\u3001\u7f16\u8bd1\u5668\u4f18\u5316<\/h2>\n\n\n\n

C#\u7f16\u8bd1\u5668\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u5bf9sizeof\u8fd0\u7b97\u7b26\u8fdb\u884c\u4f18\u5316\uff0c\u4f7f\u5176\u8fd4\u56de\u56fa\u5b9a\u7684\u503c\uff0c\u800c\u4e0d\u662f\u771f\u6b63\u7684\u7c7b\u578b\u5927\u5c0f\u3002\u8fd9\u6837\u53ef\u80fd\u5bfc\u81f4sizeof\u8fd0\u7b97\u7b26\u7684\u7ed3\u679c\u4e0d\u51c6\u786e\uff0c\u4e0d\u53ef\u9884\u6d4b\uff0c\u8fdb\u4e00\u6b65\u9650\u5236\u4e86\u5176\u5728\u4ee3\u7801\u4e2d\u7684\u4f7f\u7528\u3002<\/p>\n\n\n\n

\u5ef6\u4f38\u9605\u8bfb<\/strong><\/h2>\n\n\n\n

sizeof\u8fd0\u7b97\u7b26<\/strong><\/p>\n\n\n\n

sizeof\u8fd0\u7b97\u7b26\u662f\u4e00\u4e2a\u5728\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5e38\u89c1\u7684\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u8ba1\u7b97\u6570\u636e\u7c7b\u578b\u6216\u53d8\u91cf\u6240\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u5927\u5c0f\u3002\u5b83\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u4e2a\u65e0\u7b26\u53f7\u6574\u6570\uff0c\u8868\u793a\u6570\u636e\u7c7b\u578b\u6216\u53d8\u91cf\u6240\u5360\u7528\u7684\u5b57\u8282\u6570\u3002<\/p>\n\n\n\n

\u5728C++\u4e2d\uff0csizeof\u8fd0\u7b97\u7b26\u7684\u8bed\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n

sizeof(type)<\/pre>\n\n\n\n
\u6216\u8005<\/p>\n\n\n\n
sizeof expression\r<\/pre>\n\n\n\n
\u5176\u4e2d\uff0ctype\u662f\u8981\u8ba1\u7b97\u5927\u5c0f\u7684\u6570\u636e\u7c7b\u578b\uff0cexpression\u662f\u8981\u8ba1\u7b97\u5927\u5c0f\u7684\u8868\u8fbe\u5f0f\u6216\u53d8\u91cf\u3002<\/p>\n\n\n\n
\u793a\u4f8b\uff1a<\/p>\n\n\n\n
#include <iostream>\r\n\r\nint main() {\r\n    int num;\r\n    std::cout << \"Size of int: \" << sizeof(int) << \" bytes\" << std::endl;\r\n    std::cout << \"Size of float: \" << sizeof(float) << \" bytes\" << std::endl;\r\n    std::cout << \"Size of char: \" << sizeof(char) << \" bytes\" << std::endl;\r\n    std::cout << \"Size of num variable: \" << sizeof(num) << \" bytes\" << std::endl;\r\n    return 0;\r\n}\r<\/pre>\n\n\n\n
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