GridViewComboBoxColumn and my classes

[Artem]

Hi.

I just start work with telerik components because my boss want by it.

But I have many question....

I have list with some data

class client
{
public name {get; set;}
public payform {get;set;}
}


class payforms
{
public id {get; set;}
public descr {get; set;}
}

List<client> clientList = new List<client>();

I bind this list to my GgridView with 2 columns: client name and client_payform.But client_payform column must be GridViewComboBoxColumn where I can select pay form and after selection update client list. If any client have pyform it must be selected in client_payform column when i open my window.

Please tell me can I do this or not, and if can tell me how. Thanks.

[Maya]

Hello sharp,

Firstly, you may take a look at our online documentation and demos for a reference on the usage of the GridViewComboBoxColumn. 
Generally, the idea is as follows:
1. The grid is aware only for the items from its own data source - thus it creates the corresponding columns for each property of the business object.
2. The source of the GridViewComboBoxColumn is quite separate than the one of the grid.
3. What synchronize them is a corresponding property (most commonly of int type) in each of the two sources. The logic inside the column makes the bond between them. 
So, in your case, you can expose a new property in the client class - let's say payformID. In the payforms class you may use the id property. Afterwards, when creating the data for the client class, you have to set the payformID property as well. The definition of the column will be as follows:

<telerik:GridViewComboBoxColumn DataMemberBinding={Binding payformID} DisplayMemberPath="Name" SelectedValueMemberPath="ID" />

 

All the best,
Maya
the Telerik team

[Artem]

Thanks.

But nothing work...

class client
{
public string name {get; set;}
public int payformid {get;set;}
}


class payforms
{
public int id {get; set;}
public string descr {get; set;}
}

List<client> clientList = new List<client>();
List<payforms> payformsList = new List<payforms>();

//when app load I fill lists

dataView.ItemSource = clientList;

in XAML I write

<telerik:GridViewComboBoxColumn Header="PayForm" DataMemberBinding="{Binding payformid}" UniqueName="PayForm" SelectedValueMemberPath="Id" DisplayMemberPath="descr" ItemsSource="{Binding payformsList}" />

when page load all lists fill and have data.

RadGridView show column with client name but combobox have no data.

[Maya]

Hello sharp,

The reason that the GridViewComboBoxColumn is not populated is that it cannot find its corresponding ItemsSource.
You may set it as follows:

(gridView.Columns["PayForm"] as GridViewComboBoxColumn).ItemsSource = payformsList;

 

All the best,
Maya
the Telerik team

[Artem]

Thanks.

I forgo this line....

I have one question.

How can I know when user change selected item in this combobox?

I want save new vale to database when user change payform.

[Maya]

Hi,

You may add a handler for the SelectionChanged event of the RadComboBox like follows:

this.AddHandler(RadComboBox.SelectionChangedEvent, new Telerik.Windows.Controls.SelectionChangedEventHandler(comboSelectionChanged));

private void comboSelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
{
    if (e.RemovedItems.Count != 0)
    {
        //this ensures a selection from the drop down is performed.
    }
}

 

Best wishes,
Maya
the Telerik team