asked on

How do I get my object back from an item in a DropDownList ?

I have a dictionary with a class (UserClass) asvalue and a int as key
I populate the DropDownList with the dictionary using datasource
When the user selects an item from the CreatorFilter Dropdownlist I want to get the UserClass object back to get access to its ID property

Tried this: Guid UserID = (UserClass)CreatorFilter.SelectedItem).ID;
But gets the following error: Cannot convert type 'System.Web.UI.WebControls.ListItem' to 'UserClass'

How can I access the UserClass object from the selected item in the dropdownlost?

// I have a dictionary with a class (UserClass) asvalue and a int as key
private Dictionary<int, UserClass> createdBy;
 
//I populate the DropDownList with the dictionary using datasource
CreatorFilter.DataSource = createdBy;
CreatorFilter.DataTextField = "Value";
CreatorFilter.DataValueField = "Key";
CreatorFilter.DataBind();
 
//When the user selects an item from the CreatorFilter Dropdownlist I want to get the UserClass object back to get access to its ID property
// Tried this:
 
Guid UserID = (UserClass)CreatorFilter.SelectedItem).ID;
 
// But I get an error: 
// Cannot convert type 'System.Web.UI.WebControls.ListItem' to 'UserClass'
 
// How can I access the UserClass object from the selected item in the dropdownlost?

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Ashutosh Vyas

I am not too good with Generics, and have not tried your code, but my first look and I feel it should rather be:

Guid UserID = (UserClass)CreatorFilter.SelectedValue).ID;

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Toms Edison

Try using
(UserClass)CreatorFilter.SelectedValue;;

SameerJagdale

what type of data you will get for CreatorFilter.SelectedItem?

fc_curling

ASKER

@ashutosh9910:, @TechTiger007:

>>Guid creator = ((UserClass)CreatorFilter.SelectedValue).ID;
Gives the following error: Cannot convert type 'string' to 'UserClass'

@SameerJagdale:
I want to get the UserClass object back which I put into the dropdownlist using the datasource = dictionary.

fc_curling

ASKER

This is the UserClass:

public class UserClass
{
  public Guid ID;
  public string Username;
  public string Fullname;
  public int? Role;
 
  public UserClass(User user)
  {
    this.ID = user.ID;
    this.Username = user.Username;
    this.Fullname = user.FullName;
    this.Role = user.Role;
  }
  public UserClass()
  {
  }
 
  public override string ToString()
  {
    return this.Username;
  }
 
}

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SameerJagdale

i know that.. what i mean to ask is - currently what is the type of data you are getting..
object o = CreatorFilter.SelectedItem;
need info about o?

fc_curling

ASKER

CreatorFilter.SelectedItem; returns a ListItem object

fc_curling

ASKER

Important info: This is a dropdownlist control from a ASP.NET 3.5 webpage.

ASKER CERTIFIED SOLUTION

SameerJagdale

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