Hello Roman,
Thank you for writing.
I have prepared a sample code snippet demonstrating that when updating a property in the
DataBoundItem doesn't collapse the expanded rows:
BindingList<Student> collectionOfStudents = new BindingList<Student>();
BindingList<School> collectionOfSchools = new BindingList<School>();
public Form1()
{
InitializeComponent();
collectionOfStudents.Add(new Student(1, "Peter", "D-",2));
collectionOfStudents.Add(new Student(2, "Antony", "B+",1));
collectionOfStudents.Add(new Student(3, "David", "A-",1));
collectionOfStudents.Add(new Student(4, "John", "D-",2));
collectionOfSchools.Add(new School("Schrool 1",1));
collectionOfSchools.Add(new School("Schrool 2",2));
radGridView1.DataSource = collectionOfSchools;
radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
GridViewTemplate template = new GridViewTemplate();
template.DataSource = collectionOfStudents;
template.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
radGridView1.MasterTemplate.Templates.Add(template);
GridViewRelation relation = new GridViewRelation(radGridView1.MasterTemplate);
relation.ChildTemplate = template;
relation.RelationName = "SchoolsStudents";
relation.ParentColumnNames.Add("Id");
relation.ChildColumnNames.Add("SchoolId");
radGridView1.Relations.Add(relation);
}
public class School: System.ComponentModel.INotifyPropertyChanged
{
string _name;
int _id;
public School(string name, int id)
{
this._name = name;
this._id = id;
}
public string Name
{
get
{
return this._name;
}
set
{
this._name = value;
OnPropertyChanged("Name");
}
}
public int Id
{
get
{
return this._id;
}
set
{
this._id = value;
OnPropertyChanged("Id");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
public class Student : System.ComponentModel.INotifyPropertyChanged
{
int m_id;
string m_name;
string m_grade;
int school_id;
public event PropertyChangedEventHandler PropertyChanged;
public Student(int m_id, string m_name, string m_grade, int s_id)
{
this.m_id = m_id;
this.m_name = m_name;
this.m_grade = m_grade;
this.school_id = s_id;
}
public int Id
{
get
{
return m_id;
}
set
{
if (this.m_id != value)
{
this.m_id = value;
OnPropertyChanged("Id");
}
}
}
public string Name
{
get
{
return m_name;
}
set
{
if (this.m_name != value)
{
this.m_name = value;
OnPropertyChanged("Name");
}
}
}
public string Grade
{
get
{
return m_grade;
}
set
{
if (this.m_grade != value)
{
this.m_grade = value;
OnPropertyChanged("Grade");
}
}
}
public int SchoolId
{
get
{
return this.school_id;
}
set
{
this.school_id = value;
OnPropertyChanged("SchoolId");
}
}
protected virtual void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
private void radButton1_Click(object sender, EventArgs e)
{
collectionOfStudents[1].Name = "Name" + DateTime.Now.ToLongTimeString();
}
The following help article demonstrates how to reflect custom object changes in
RadGridView:
http://docs.telerik.com/devtools/winforms/gridview/populating-with-data/reflecting-custom-object-changes-in-rgv
However, if you reset the
DataSource property of
RadGridView, before setting the
property keep in an appropriate data structure which
are the expanded rows and restore them after that.
I hope this information helps. Should you have further questions I would be glad to help.
Regards,
Dess
Telerik by Progress
Check out the Windows Forms project converter, which aids the conversion process from standard Windows Forms applications written in C# or VB to Telerik UI for WinForms.For more information check out this
blog post and share your thoughts.