Insert data using Entity Framework model

Question

I m trying to insert some data in my database using Entity Framework model  but for some unknown reasons to me  it does nothing   Am I missing something here   using  var context   new DatabaseEntities          var t   new test               ID   Guid NewGuid            name    blah              context AddTotest t       context SaveChanges

User · Answer

var context   new DatabaseEntities     var t   new test   Make sure you have a table called test in DB       ID   Guid NewGuid        name    blah       context test Add t   context SaveChanges      Should do it

User · Answer

It should be   context TableName AddObject TableEntityInstance     Where    TableName  the name of the table in the database  TableEntityInstance  an instance of the table entity class    If your table is Orders  then   Order order   new Order    context Orders AddObject order     For example    var id   Guid NewGuid         insert  using  var db   new EfContext  name EfSample           var customers   db Set lt Customer gt         customers Add  new Customer   CustomerId   id  Name    John Doe            db SaveChanges         Here is a live example   public void UpdatePlayerScreen byte   imageBytes  string installationKey      var player    from p in this ObjectContext Players where p InstallationKey    installationKey select p  FirstOrDefault       var current    from d in this ObjectContext Screenshots where d PlayerID    player ID select d  FirstOrDefault       if  current    null          current Screen   imageBytes      current Refreshed   DateTime Now       this ObjectContext SaveChanges          else         Screenshot screenshot   new Screenshot         screenshot ID   Guid NewGuid        screenshot Interval   1000      screenshot IsTurnedOn   true      screenshot PlayerID   player ID      screenshot Refreshed   DateTime Now      screenshot Screen   imageBytes       this ObjectContext Screenshots AddObject screenshot       this ObjectContext SaveChanges

User · Answer

HttpPost     it use when you write logic on button click event  public ActionResult DemoInsert EmployeeModel emp        Employee emptbl   new Employee          make object of table     emptbl EmpName   emp EmpName      emptbl EmpAddress   emp EmpAddress      add if any field you want insert     dbc Employees Add emptbl                pass the table object      dbc SaveChanges         return View

User · Answer

I m using EF6   and I find something strange   Suppose Customer has constructor with parameter    if I use  new Customer id   name    and do   using  var db   new EfContext  name EfSample           db Customers Add  new Customer id   name          db SaveChanges         It run through without error  but when I look into the DataBase  I find in fact that the data Is NOT be Inserted   But if I add the curly brackets  use new Customer id   name     and do   using  var db   new EfContext  name EfSample           db Customers Add  new Customer id   name            db SaveChanges         the data will then actually BE Inserted    seems the Curly Brackets make the difference  I guess that only when add Curly Brackets  entity framework will recognize this is a real concrete data

[c#] Insert data using Entity Framework model

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