1、新建NetCore项目：dotnet new webapi

2、添加EF Core依赖包：
dotnet add package Microsoft.EntityFrameworkCore --version 3.1.22

3、添加达梦数据库驱动
达梦数据库驱动路径：
drivers\dotNet\EFCore.Dm3.1\Microsoft.EntityFrameworkCore.Dm.3.1.0.nupkg
drivers\dotNet\DmProvider\netcoreapp3.1\DmProvider.dll

4、数据库配置
services.AddDbContext<UnitRatingDbContext>(builder =>builder.UseDm("Server=localhost;User=UnitRating;Pwd=TEST1234567!;", options => options.CommandTimeout(dbConfigurationOptions.Timeout)));