Get text or index of item from combobox with contains-CodePudding

I have a combobox and the items of the group membership look like

200;Heater
300;Cooler
400;Fan

If I select a part, only the number of the membership e.g. 200 is stored in the database.

Now I want to do a pre selection of the combobox. To check if the combobox contains a membership number is working.

 void MembershipPreSelection(ComboBox cb, string text)
 {
    if (cb.Items.Cast<Part>().Any(c => c.Membership.Contains(text)))
        {
            // now I want the string for the item that contains the text.
        }
  }

But to get the text of the combobox item (e.g. 200;Heater)?? This is what I tried, but I do not get the item text.

string m = cb.Items.Cast<Part>().Where(c => c.Hauptbaugruppe.Contains(text)).ToString();

CodePudding user response：

The biggest issue seems to be using Where in your Linq statement which will return a collection of Part. Then, when the ToString() is called on the result, it's probably is something cryptic like:

System.Linq.Enumerable WhereEnumerableIterator`1[your_namespace.Part]

To fix, consider something like First or Single in place of Where to return a single item.

string m = 
    cb.Items.Cast<Part>().Single(c => c.Hauptbaugruppe.Contains(text)).ToString();

You've probably already done this, but make sure that you have an override to Part.ToString() that returns the format that you want.

// Example Part class
class Part
{
    public int ID { get; set; } = 0;
    public string Description { get; set; } = "New Item";
    
    // What do you want to see for `Part.ToString()`
    public override string ToString()
    {
        return $"ID: {ID} Description: {Description}";
    }
}