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並前往https://answerlib.com/question/42007/why-does-http-put-from-angular-9-service-create-a-new-db-entity-instead-of-updating-original---cannot-read-property-id-of-null--concurrency-error.html

无法读取NULL和并发错误的属性'id' - IT答乎 - IT新技术分享网

... public WebServiceRepository(ApplicationDbContext ctx) => context = ctx; public object GetProduct(int id) { return context.Products.

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