{"id":209,"date":"2020-10-05T07:57:59","date_gmt":"2020-10-05T07:57:59","guid":{"rendered":"https:\/\/turtleflyblog.com\/?p=209"},"modified":"2022-02-28T09:49:34","modified_gmt":"2022-02-28T09:49:34","slug":"delegation","status":"publish","type":"post","link":"https:\/\/turtleflyblog.com\/zh\/2020\/10\/05\/delegation\/","title":{"rendered":"\u8b1b\u89e3C#\u59d4\u8a17(DELEGATE)"},"content":{"rendered":"\n<p id=\"block-5f6f5e95-84aa-46d1-9e90-fbb2dd24e9c6\">C#\u59d4\u8a17\u985e\u4f3cC\/C++\u4e2d\u7684\u51fd\u6578\u6307\u91dd\u529f\u80fd(\u5b83\u662f\u985e\u578b\u5b89\u5168\u7684)\u3002\u5b83\u5b9a\u7fa9\u4e86\u65b9\u6cd5\u578b\u5225\uff0c\u53ef\u4ee5\u7576\u4f5c\u65b9\u6cd5\u7684\u5f15\u6578\u4f86\u9032\u884c\u50b3\u905e\u3002\u9019\u6a23\u53ef\u4ee5\u589e\u52a0\u7a0b\u5f0f\u78bc\u7684\u64f4\u5145\u6027(\u4e0d\u9700\u7528\u6c89\u9577\u7684if-else\u6216switch\u4f86\u5224\u65b7\u8a72\u7528\u54ea\u7a2e\u65b9\u6cd5)\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b<\/p>\n\n\n\n<figure 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src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP3.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP3.png\"\/><\/figure>\n\n\n\n<p id=\"block-72b24029-04ba-4e6b-ab7c-1a57c6955903\">\u6b64\u65b9\u6cd5\u6c42\u8a72\u5716\u5f62\u7684\u9762\u7a4d<\/p>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-73549e93-55cf-4732-9b56-662a3ef71149\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP4.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP4.png\"\/><\/figure>\n\n\n\n<p id=\"block-184ce172-013f-48c1-b04d-5b8fd0fdbe43\">\u5728Main\u4e2d\u57f7\u884c<\/p>\n\n\n\n<p 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id=\"block-f99c2343-5a6c-46b3-8059-04b4825608bc\">\u59d4\u8a17(delegation)\u53ef\u4ee5\u628a\u65b9\u6cd5\u7576\u6210\u5f15\u6578\uff0c\u9019\u6a23\u5c31\u4e0d\u9700\u8981\u50cf\u4e4b\u524dGetShapeArea\u65b9\u6cd5\u7528switch\u4f86\u5224\u65b7\u8a72\u5716\u5f62\u61c9\u8a72\u7528\u90a3\u7a2e\u8a08\u7b97\u9762\u7a4d\u7684\u65b9\u6cd5\u3002\u5982\u6b64\u53ef\u7cbe\u7c21\u7a0b\u5f0f\u78bc\u548c\u589e\u52a0\u64f4\u5145\u6027\u3002<\/p>\n\n\n\n<p id=\"block-771f74b9-b7c4-4419-aebf-e10cf847d152\"><strong>\u591a\u64ad\u59d4\u8a17<\/strong><\/p>\n\n\n\n<p id=\"block-ceec06eb-7604-480e-b21b-2040e8f6909e\">\u6211\u5011\u53ef\u4ee5\u5c07\u591a\u500b\u65b9\u6cd5\u8ce6\u4e88\u59d4\u8a17\u3002\u6211\u5011\u9700\u8981\u7528\u5230+\u548c+=\u3002\u4ee5\u4e0b\u662f\u4f8b\u5b50<\/p>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-4d21dc93-5019-4db4-ae8a-41a319985058\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP6.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP6.png\"\/><\/figure>\n\n\n\n<p id=\"block-d37377be-63ad-4a7a-8de3-1ab59664fd56\">\u57f7\u884c\u8d77\u4f86\u6703<\/p>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-d2d14e3a-7348-4614-9119-3a875989f5a1\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP7.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP7.png\"\/><\/figure>\n\n\n\n<p id=\"block-84552ad2-ff3b-4b2d-9474-576cd91a6992\">\u82e5\u4e0d\u60f3\u8981\u5713\u5f62\u9762\u7a4d\uff0c\u5247\u53ef\u4ee5<\/p>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-44dcac5e-4fe1-477a-819a-817690532647\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP8.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP8.png\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-77d50836-f445-49b3-bea8-c777dff70b97\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP9.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP9.png\"\/><\/figure>\n\n\n\n<p id=\"block-cca7fe6d-1f9a-4545-a7f8-270358ce124a\"><strong>\u533f\u540d\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<p id=\"block-1ed20088-3eee-4b98-9945-f5a746690e4f\">\u59d4\u8a17\u4e5f\u53ef\u4ee5\u7528\u533f\u540d\u65b9\u5f0f(\u4f7f\u7528delegate\u95dc\u9375\u5b57)\u4f86\u5b9a\u7fa9\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b<\/p>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-143a4eb5-2156-45ca-a0d7-2bab73ef77eb\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP10.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP10.png\"\/><\/figure>\n\n\n\n<p id=\"block-1e7b7433-02dc-4f36-8c84-92cc049db0d2\">\u57f7\u884c\u7d50\u679c\u5982\u4e0b:<\/p>\n\n\n\n<figure class=\"wp-block-image\" id=\"block-46080af8-867a-42f5-abfd-9cbe07788582\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/turtleflyblog.com\/wp-content\/uploads\/2020\/06\/delegateP11.png?ssl=1\" alt=\"This image has an empty alt attribute; its file name is delegateP11.png\"\/><\/figure>\n\n\n\n<p id=\"block-3179ac4a-34f8-49bd-aa66-fe56ea2f5f54\"><strong>\u59d4\u8a17\u5176\u5b83\u985e\u578b(Action\uff0cFunc\uff0cpredicate)<\/strong><\/p>\n\n\n\n<p id=\"block-6a174c2b-3456-4d59-ae70-0d60d7df0027\">Action\u4ee3\u8868\u7121\u6cd5\u56de\u503c\u7684\u59d4\u8a17\uff0c\u4e5f\u5c31\u662fvoid\u3002Action&lt;int, char&gt;\u4ee3\u8868\u6709\u5169\u500b\u53c3\u6578\u5206\u5225\u70ba(int\u548ccha4)\u3002<\/p>\n\n\n\n<p 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id=\"block-f8ffd10a-b7ad-4878-8193-586523c84be4\">predicate\u4ee3\u8868\u8fd4\u56de\u503c\u70babool\u3002Predicate&lt;int&gt;\u8868\u793a\u50b3\u5165\u53c3\u6578\u70baint\u800c\u8fd4\u56de\u503c\u70babool\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C#\u59d4\u8a17\u985e\u4f3cC\/C++\u4e2d\u7684\u51fd\u6578\u6307\u91dd\u529f\u80fd(\u5b83\u662f\u985e\u578b\u5b89\u5168\u7684)\u3002\u5b83\u5b9a\u7fa9\u4e86\u65b9\u6cd5\u578b\u5225\uff0c\u53ef\u4ee5\u7576\u4f5c\u65b9\u6cd5\u7684\u5f15\u6578\u4f86\u9032\u884c\u50b3\u905e\u3002\u9019\u6a23\u53ef\u4ee5\u589e\u52a0\u7a0b\u5f0f\u78bc\u7684\u64f4\u5145\u6027(\u4e0d\u9700\u7528\u6c89\u9577\u7684if-else\u6216switch\u4f86\u5224\u65b7\u8a72\u7528\u54ea\u7a2e\u65b9\u6cd5)\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b &nbsp; \u4ee5\u4e0a\u662f\u6c42\u7684\u9577\u65b9\u578b\uff0c\u5713\u5f62\u548c\u76f4\u89d2\u4e09\u89d2\u5f62\u7684\u4e09\u500b\u65b9\u6cd5 \u6b64\u65b9\u6cd5\u6c42\u8a72\u5716\u5f62\u7684\u9762\u7a4d \u5728Main\u4e2d\u57f7\u884c 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