“System.InvalidOperationException”类型的异常在 Microsoft.EntityFrameworkCore.dll 中发生，但

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“System.InvalidOperationException”类型的异常在 Microsoft.EntityFrameworkCore.dll 中发生，但未在用户代码中进行处理

其他信息: No database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext.OnConfiguring method or by using AddDbContext on the application service provider. If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions<TContext> object in its constructor and passes it to the base constructor for DbContext.

asp.net core中连接数据库总时出现这样的错误，想知道具体怎么连接到数据库