EF Simple Example Entity Framework

1. Manage NuGet packages, add entity Framework for projects
2. Entity that establishes the model corresponding table
3. Create a new DbContext class that inherits the DbContext
4. The DbContext class plus the properties of the table, how many properties are written on the number of tables
5. The type of the property is represented by idbset<>
6. Entity Write ID, type is GUID type
7. A handle to the new DbContext class is used first
8. Use the handle can do additions and deletions and other operations

1  Public class Dbtestcontext:dbcontext 2     {3public         getset;} 4          Public Get Set  5     }

DbContext

1  Public classUser2     {3          PublicGuid Id {Get;Set; }4          Public stringName {Get;Set; }5 6          PublicGuid CompanyID {Get;Set; }7          PublicCompany Company {Get;Set; }8 9}

User

1 varEF =NewDbtestcontext ();2 3             //var C = new company ()4             //{5             //Id = Guid.NewGuid (),6             //Name = "NX"7             //};8             //var u = new User ()9             //{Ten             //Id = Guid.NewGuid (), One             //Name = "My Oh Da", A             //CompanyID = c.id, -             //}; -             //EF. Users.add (u); the             //Ef.Companies.Add (c); -               -             varDF = fromUinchEF. Users -                 whereU.company.name = ="NX" +                 Selectu; -             varFDDF =DF. ToList (); +               A             varDFE = fromUinchEF. Users atJoin Cinchef.companies on U.companyid equals c.id -                 whereC.name = ="NX" -                 Selectu; -             varFesi =DfE. ToList (); -  -Ef. SaveChanges ();

How to use

EF Simple Example Entity Framework