CODEWITHSUNDEEP
c#winformsdata-bindingcomboboxbindingsource
Gleb
Gleb

Reputation: 1432

Reflect control changes to DataSource using BindgSource

I'm using WinFroms and trying to reflect control(ComboBox) changes to DataSource using BindingSource. Actualy I want to see what item is selected in comboBox.

My model is:

public class Foo
{
    public string Name { get; set; }

    public override string ToString()
    {
        return Name;
    }
}

public class Bar
{
    public List<Foo> Foos { get; set; }
    public Foo SelectedFoo { get; set; }
}

Binding:

        List<Foo> lst = new List<Foo>();
        lst.Add(new Foo{Name="Name1"});
        lst.Add(new Foo{Name="Name2"});

        Bar bar = new Bar { Foos = lst };

        InitializeComponent();

        // bSource - is a BindingSource on the form
        this.bSource.DataSource = bar;
        // cbBinds - is a ComboBox
        this.cbBinds.DataSource = bar.Foos;
        this.cbBinds.DataBindings.Add(new Binding("SelectedItem", this.bSource, "Foos", true));

This code works and all Foos are displyed in cbBinding. But I also want to reflect when selected item changed in combobox. So I want Bar.SelectedFoo become equal to cbBinds.SelectedItem(not using change event of comboBox).

I can't figure out how to do this. Is it possible?

Upvotes: 1

Views: 59

Answers (1)

Reza Aghaei
Reza Aghaei

Reputation: 125197

The main problem in your code is you set a data-binding to Foos property of your list while you should setup data-binding to SelectedFoo.

When you set up data-binding using below codes:

comboBox1.DataSource = List1;
comboBox1.DataBindings.Add(new Binding("SelectedItem", Model1, "Property1", true));

In first line you say the combo box show all items of List1.

In second line, you say bind SelectedItem of Combo to Model1.Property1 which means when you change selected item of combo, Model1.Property1 will be set to selected item of combo.

So your code should be like this:

this.comboBox1.DataBindings.Add(new Binding("SelectedItem", bs, "SelectedFoo", true));

Note

Reading above descriptions. now you know using a BindingSource is not mandatory and you can also write your code this way:

this.comboBox1.DataSource = bar.Foos;
this.comboBox1.DataBindings.Add(new Binding("SelectedItem", bar, "SelectedFoo", true));

Upvotes: 2

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