EntityFramework start a small trial

1 Install-package entityframework

2 Creating an Entity class

public class blog{Public    int BlogId {get; set;}    public string Name {get; set;}}

3 Creating a context

public class Eftestcontext:dbcontext
{
Public Eftestcontext (): Base ("Name=sqlmonitor") {}

Public dbset<cgroup> CGroups {get; set;}
Public dbset<address> Addresses {get; set;}
Public dbset<contact> Contacts {get; set;}
protected override void Onmodelcreating (Dbmodelbuilder modelBuilder)
{
Base. Onmodelcreating (ModelBuilder);
Modelbuilder.entity<contact> (). Hasoptional (c = c.address)
. Withoptionaldependent (add = Add.) Contact);
Modelbuilder.entity<cgroup> (). Hasmany (c = c.contacts)
. Withrequired (c = c.cgroup). Willcascadeondelete (FALSE);
Modelbuilder.entity<easyuiefwebapp.dal.efmodels.contact> (). Hasoptional (c = c.cgroup)
// . Withmany (c = c.contacts). Willcascadeondelete (TRUE);
}
}

4 Set the Data Link link note to match the name of the context, otherwise create the local database

<connectionStrings>    <add name= "SQLMonitor" connectionstring= "Data source= (LocalDb) \v11.0;initial catalog=sqlmonitor;integrated security=sspi; "providername=" System.Data.SqlClient "/>  </ Connectionstrings>
Enable-migrations
Execute the above command in NuGet, if the error, 1 please see whether to write errors, 2 is the EF project, 3 after compiling try 4 to see if the version of NuGet is too old
6 Update-database

Update to the database.  Note that some of the article is written add-migrations initialcreate  I executed the error, no solution,
With Update-database, there is no error, and the database is updated correctly.
7  add-migration Note the following names, such as  add-migration modifyusertable
Similar version-controlled stuff

EntityFramework start a small trial