CODEWITHSUNDEEP
c#winformsdelphi
Thomas
Thomas

Reputation: 707

Delphi to C# WinForms: Iterate through form components on form

In Delphi you can iterate through a forms components (not controls) like so:

for i := 0 to Form1.ComponentCount - 1 do begin

However in c# Winforms i tried the following:

        foreach (var component in this.components.Components)
        {
            MessageBox.Show(component.ToString());
        }

I couldn't find any examples on google on how to iterate through components. All i found was how to iterate through controls.

I want to list all controls and components on a form. For example if there are 2 buttons and 2 imagelists i want to list all 4 items.

Upvotes: 2

Views: 502

Answers (1)

GuidoG
GuidoG

Reputation: 12059

This is not easy in c#
Also be very carefull when you use inherited forms.
Unlike Delphi the unvisual designer has no support for oop when it comes to the components collection, there is a new collection created for every form even for descendants !

I did it like this : (it will only list components not controls !)

IEnumerable<Component> EnumerateComponents()
{
    return from field in GetType().GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
               where typeof(Component).IsAssignableFrom(field.FieldType)
               let component = (Component)field.GetValue(this)
               where component != null
               select component;
    }

you can call it like this : 

foreach (Component component in EnumerateComponents())
{
    if (component is ImageList)
    {
    }
}

Upvotes: 2

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