no parameterless constructor define for type 解决一例

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no parameterless constructor define for type 解决一例

在生成根据模型和上下文生成带增删查改操作的视图的控制器时,提示上述信息,网上查找了资料也没有解决,突然想起该项目是连接MSSQL数据库和Redis数据库的,并且已经依赖注入了,而Redis数据库的服务器却因故关闭了,把Redis的注入注释了就正常生成了. services.AddDbContext<CustomDbContext>(options => options.UseSqlServer( Configuration.GetConnectionString("Defaul…

AddDbContext was called with configuration, but the context type 'NewsContext' only declares a parameterless constructor?

问题 An error occurred while starting the application. ArgumentException: AddDbContext was called with configuration, but the context type 'NewsContext' only declares a parameterless constructor. This means that the configuration passed to AddDbContext…

AddDbContext was called with configuration, but the context type 'MyDBContext' only declares a parameterless constructor

System.ArgumentException HResult=0x80070057 Message=AddDbContext was called with configuration, but the context type 'MyDBContext' only declares a parameterless constructor. This means that the configuration passed to AddDbContext will never be used.…

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)宏的运行机理:1. ( (TYPE *)0 ) 将零转型为TYPE类型指针; 2. ((TYPE *)0)->MEMBER 访问结构中的数据成员; 3. &( ( (TYPE *)0 )->MEMBER )取出数据成员的地址; 4.(size_t)(&(((TYPE*)0)->MEMBER))结果转换类型.巧妙之处在于将0转换成(TY…

error: expected constructor, destructor, or type conversion before '.' token

今天写代码是遇到这样一个问题error: expected constructor, destructor, or type conversion before '.' token:立马网上查,原来是说不能再全局域进行不能用于赋值.运算.调用函数等,只能做变量的声明和初始化变量. 下面是我出错的代码: #include <iostream> int a[100]; memset(a,0,sizeof(a));//出错的地方,不能再全局域对变量进行赋值操作 int main(){ //doing…

【错误】expected constructor, destructor, or type conversion before '.' token - 第八个游侠的日志 - 网易博客

[错误]expected constructor, destructor, or type conversion before '.' token - 第八个游侠的日志 - 网易博客 [错误]expected constructor, destructor, or type conversion before '.' token 2012-08-27 03:02:27| 分类: 技术·程序 | 标签: |字号大中小订阅今天犯一个低级的C++语法错误,这里记录一下,以防下次再错, 错误如…

JSON parse error: No suitable constructor found for type

错误信息: 2019-02-19 09:17:58,678 [http-nio-8080-exec-1] WARN org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error:…