Get back anonymous type [duplicate]

问题

Possible Duplicate:
Accessing C# Anonymous Type Objects
Working with C# Anonymous Types

I'm using linq to entities to get id and full name from a table with customers.

  public IQueryable RegresaClientesPorEmpresa(int id_emp)
    {
        var clientes = from c in context.clientes
                       where c.IDEmpresa == id_emp
                       select new
                       {
                           c.IDCliente,
                           NomComp = c.Nombres +" "+ c.ApellidoP +" "+ c.ApellidoM
                       };
        return clientes;
    }

The result is used as the datasource of a combobox, then when SelectionChangeCommitted is triggered in my combo, I want the selected item to be added to a listbox:

var clientes = operaciones.RegresaClientesPorEmpresa(2);
 combo_cliente.DataSource = clientes;
 combo_cliente.DisplayMember = "NomComp";
 combo_cliente.ValueMember = "IDCliente";

 listBox_grupo.DisplayMember = "NomComp";
 listBox_grupo.ValueMember = "IDCliente";

 private void combo_cliente_SelectionChangeCommitted(object sender, EventArgs e)
    {
        listBox_grupo.Items.Add(combo_cliente.SelectedItem); 
    }

Until here everything is fine. Finally I want to get all "IDCliente"'s values from all items added to my listbox, the problem is that I don't know how to do it because every item is an Anonymous data type. Can anyone help me?

回答1:

The scope of an anonymous type is limited to the method in which it is "declared" (well it's not really declared, but you see what I mean). If you want to use the result of your query in another method, create a named type to hold the results.

回答2:

You shouldn't return anonymous types from your methods if you're expecting to access their properties. It'll be easier on you if you define a class instead, because that establishes the contract of your method.

回答3:

just create a class to avoid anonymous type.

class Foo
{
   public string NomComp {get ; set;}
   public string IDCliente {get ; set;}
}

and do

select new Foo
{
     ...
}

to save some hassle.

or You can define

T Cast<T>(object obj, T type)
{
   return (T)obj;
}

and then use

object anonymousObject = GetSelection();
var selection = Cast(anonymousObject , new { IDCliente="", NomComp ="" });

and then you should be able to do selection.NomComp to get the property value.

来源：https://stackoverflow.com/questions/7614912/get-back-anonymous-type

标签

winforms

anonymous-types