C#------EntityFramework实体加载数据库SQLServer(MySQL)

一.SQLServer数据库创建表Company，包含ID，CName，IsEnabled三列

二.(1)VS新建一个DXApplication工程，名为CompanyManageSystem

    (2)在工程下，右键点击“引用” -> "管理NuGet程序包" -> "浏览" -> 找到"EntityFramework" -> 点击“安装”

    (3)新建一个类PSContext.cs

namespace CompanyManageSystem
{
    class PSContext : DbContext
    {
        public PSContext() : base("name=PSContext"){}

        public virtual DbSet<Company> Companys { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
        }

    }
}

     (4)新建一个类Company.cs

namespace CompanyManageSystem.Model
{
    [Table("Company")]
    public class Company
    {
        public Guid ID { get; set; }
        public String CName { get; set; }
        public bool IsEnabled { get; set; }
    }
}

      (5)在App.config添加数据库的代码

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <connectionStrings>
    <add name="PSContext" connectionString="data source=X450V-PC;initial catalog=date;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />
  </connectionStrings>
</configuration>

      (6)添加窗体Frm_ShowInfo.cs    (注意：FiledName里面的名字要和数据库的列名相同，(Name)里面的名字尽量不取Name)

添加控件如图所示：

namespace CompanyManageSystem
{
    public partial class Frm_ShowInfo : Form
    {
        PSContext _db = new PSContext();

        public Frm_ShowInfo()
        {
            InitializeComponent();
        }

        private void Frm_ShowInfo_Load(object sender, EventArgs e)
        {
            CompanyGrid.DataSource = _db.Companys.AsNoTracking().ToList();
        }

    }
}

         (7)在Program.cs启动Frm_ShowInfo.cs窗口

namespace CompanyManageSystem
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            BonusSkins.Register();
            SkinManager.EnableFormSkins();
            UserLookAndFeel.Default.SetSkinStyle("DevExpress Style");
            Application.Run(new Frm_ShowInfo());
        }
    }
}

实体加载MySQL数据库

1.需要在“管理NuGet程序包”里面安装装“MySql.Data”和“MySql.Data.Entity”
2.配置App.config文件
<connectionStrings>
    <add name="PSContext" connectionString="Data Source=192.168.3.16;port=3306;Initial Catalog=tsyw;user id=root;password=123456;Charset=utf8" providerName="MySql.Data.MySqlClient" />
</connectionStrings>
3.其余部分和SQLServer一样

延伸知识(本地数据库或其它服务器)

<connectionStrings>
    <!--<add name="ConnectionStrings" connectionString="Data Source=localhost;Initial Catalog=TSYW;User ID=sa;Password=2277092;Persist Security Info=True;" providerName="System.Data.SqlClient" />-->
    <!--<add name="ConnectionStrings" connectionString="data source=X450V-PC;initial catalog=TSYW;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />-->
    <add name="PSContext" connectionString="Data Source=127.0.0.1;port=3306;Initial Catalog=tsyw;user id=root;password=123456;Charset=utf8" providerName="MySql.Data.MySqlClient" />
  </connectionStrings>