Cast Question.

[mironline]

Dear Friend .
I have a question about casting in C# . I would highly appreciate if someone could help me.

var t = (from o in baseContext.Myuser[B]s[/B]
where o.name == "name"
select o);

object.datasource = t;

in object selectedindexch ange event :

var address = (object.selecteditem as [B]Myuser)[/B].address;

Now I want to select like this

var t = (from o in baseContext.Myuser[B]s[/B]
where o.name == "name"
select new {mynewName = o.name + " *** " + o.family , o.address , o.age );

object.datasource = t;

the question is :
how can get mynewName value in selectedindexch ange event .

best.
ali

[Christian Binder]

Hi,

I don't know, which class your "object" is of, but maybe there is a ValueMember or DisplayMember property.
If you set the ValueMember-property to "mynewName"

object.ValueMember = "mynewName"

you could use it in the SelectedIndexCh anged-EventHandler

object.SelectedValue

[mironline]

dear ChBinder
thank you for your replay.

my problem is : who to access the object's datasource on slectedIndexCha nged
event.

your solution is the good way to get the 'mynewName' value , but how could I get the combination of "mynewName" and "address" ?

[Christian Binder]

Hi,

the problem is, you are using an anonymous type as the result of your select-statement.
If you would use a class defined by yourself, it would make it easier.

void xyz {
  var t = (from user in baseContext.Myusers
    where user.name == "name"
    select new NewMyUser(o.name + " *** " + o.family , o.address , o.age)).ToArray();  // This returns NewMyUser[]

  object.DataSource = t;
  object.DisplayMember = "MyNewName"; // Show MyNewName to User
  
}

class NewMyUser {
  public NewMyUser(string myNewName, string address, int age) {
    MyNewName = myNewName;
    Address = address;
    Age = age;
  }

  public string MyNewName { get; set; }
  public string Address { get; set; }
  public int Age { get; set; }
}

In the SelectedIndexCh anged-Event you can cast the SelectedItem and access the properties

(object.SelectedItem as NewMyUser).Age // or  .Address ...

[Plater]

This is very strange looking C#.
I am guessing those are linq queries?

[Christian Binder]

This is very strange looking C#.
I am guessing those are linq queries?

Yes, the creation of the DataSource (resp. the filtering of the original data) is done via LinQ. But the main problem here is that it's not possible (without using of Reflection imho) to access properties of anonymous types.