One of the (many) powerful features of XAF is the ability to extend. I recently had a client wanting to provide a simple dialog to let the user choose a folder. There is a file selection function already built into XAF, but since we only wanted a folder it would not suffice.
To achieve what was needed I had to create a CustomPropertyEditor and hook into the FolderBrowserDialog available in the System.Windows.Forms library.
Simply create a new class in your Windows module (if you have an existing folder for Editors, it’s a good place to store it), you can paste the code from below (just remember to update the namespace 
)
using System;
using System.Collections.Generic;
using DevExpress.ExpressApp.Win.Editors;
using DevExpress.ExpressApp.Model;
using DevExpress.ExpressApp.Editors;
using System.Windows.Forms;
using DevExpress.XtraEditors;
namespace MM.Module.Win.Editors
{
[PropertyEditor(typeof(string),false)]
public class FolderBrowseEditor : WinPropertyEditor
{
public FolderBrowseEditor(Type objectType, IModelMemberViewItem model)
: base(objectType, model)
{
var propertyType = model.ModelMember.Type;
var validTypes = new List<Type>{
typeof(string)
};
if (!validTypes.Contains(propertyType))
throw new Exception("Can't use FolderBrowseEditor with property type " + propertyType.FullName);
this.ControlBindingProperty = "Value";
}
ButtonEdit txtFolderPath;
private void txtFolderPath_ButtonClick(object sender, DevExpress.XtraEditors.Controls.ButtonPressedEventArgs e)
{
FolderBrowserDialog dialog = new FolderBrowserDialog();
dialog.Description = "Select folder...";
if (dialog.ShowDialog() != DialogResult.Cancel){
txtFolderPath.Text = dialog.SelectedPath;
}
}
private void txtFolderPath_EditValueChanged(object sender, EventArgs e)
{
PropertyValue = txtFolderPath.Text;
OnControlValueChanged();
}
protected override object CreateControlCore()
{
txtFolderPath = new ButtonEdit();
txtFolderPath.ButtonClick += txtFolderPath_ButtonClick;
txtFolderPath.EditValueChanged += txtFolderPath_EditValueChanged;
return txtFolderPath;
}
protected override void ReadValueCore()
{
txtFolderPath.Text = Convert.ToString(PropertyValue);
}
protected override void Dispose(bool disposing)
{
if (txtFolderPath != null)
{
txtFolderPath.ButtonClick -= txtFolderPath_ButtonClick;
txtFolderPath.EditValueChanged -= txtFolderPath_EditValueChanged;
}
base.Dispose(disposing);
}
}
}Build your project, and then inside the model you will be able to choose YourProject.Module.Win.Editors.FolderBrowserEditor as a property type. Run your application and you will see a nice XtraEditors.ButtonEdit control rendered with a […] button, clicking on the button will present you with a standard OS folder browser, if you select a folder, the result will be returned to the control and your data updated !
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