When using GridView in Hierarchy mode with a Template and binding to BindingList for Children:
public class Parent{ public Parent() { children = new BindingList<Child2>(); } public int Id { get; set; } public string Prop1 { get; set; } public BindingList<Child2> children { get; set; }}public class Child2 : INotifyPropertyChanged{ public int Id { get; set; } public string Prop1 { get; set; } private int _Prop2; public int Prop2 { get { return this._Prop2; } set { if (this._Prop2 != value) { this._Prop2 = value; if(PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Prop2")); } } } public string Prop3 { get; set; } public event PropertyChangedEventHandler PropertyChanged;}
If there is grouped columns in child template, changing properties is not reflected:
public partial class Form1 : Form { BindingList<Parent> data; public Form1() { InitializeComponent(); InitGrid(); data = new BindingList<Parent>(); for (int i = 0; i < 3; i++) { Parent parent = new Parent() { Id = i, Prop1 = "testProp" + i }; for (int j = 0; j < 4; j++) { Child2 child = new Child2() { Id = i * j, Prop1 = "testProp" + i, Prop2 = j % 2, Prop3 = "another" }; parent.children.Add(child); } data.Add(parent); } this.radGridView1.DataSource = data; this.radGridView1.CellDoubleClick += radGridView1_CellDoubleClick; } void radGridView1_CellDoubleClick(object sender, GridViewCellEventArgs e) { Child2 child = e.Row.DataBoundItem as Child2; MessageBox.Show(child.Prop2.ToString()); } private void InitGrid() { this.radGridView1.Columns.Add(CreateColumn("Id")); this.radGridView1.Columns.Add(CreateColumn("Prop1")); GridViewTemplate template = new GridViewTemplate(); template.AllowAddNewRow = false; template.AllowDeleteRow = false; template.AllowEditRow = false; template.AutoGenerateColumns = false; template.Columns.Add(CreateColumn("Id")); template.Columns.Add(CreateColumn("Prop1")); template.Columns.Add(CreateColumn("Prop2")); template.Columns.Add(CreateColumn("Prop3")); GridViewRelation r = new GridViewRelation(this.radGridView1.MasterTemplate, template); r.ChildColumnNames.Add("children"); template.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill; template.EnableFiltering = false; template.EnableGrouping = true; template.ShowColumnHeaders = true; template.ShowRowHeaderColumn = false; this.radGridView1.EnableGrouping = false; this.radGridView1.EnableCustomGrouping = false; GroupDescriptor gd = new GroupDescriptor(); gd.GroupNames.Add("Prop2", ListSortDirection.Ascending); gd.GroupNames.Add("Prop3", ListSortDirection.Ascending); template.GroupDescriptors.Add(gd); this.radGridView1.Templates.Add(template); this.radGridView1.Relations.Add(r); this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill; } GridViewTextBoxColumn CreateColumn(string Field) { GridViewTextBoxColumn col = new GridViewTextBoxColumn(); col.Name = Field; col.FieldName = Field; col.HeaderText = Field; return col; } private void button1_Click(object sender, EventArgs e) { this.data.First().children.First().Prop2 = 1; } }When I Click Button1 nothing happens
Is this a bug or am I doing something wrong?
2 Answers, 1 is accepted
0
Vicent
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answered on 03 Mar 2020, 06:15 PM
Same project without adding GroupDescriptor to child template works with no problem
0
Hello Vicent,
The provided code snippet is greatly appreciated. When you change the value in a grouped grid the GroupDescriptor is not automatically reevaluated. This is why you need to do it manually. Please refer to the updated Button_Click event:
private void radButton1_Click(object sender, EventArgs e)
{
List<GroupDescriptor> groups = new List<GroupDescriptor>();
groups.AddRange(this.radGridView1.Templates[0].GroupDescriptors);
this.radGridView1.Templates[0].GroupDescriptors.Clear();
this.data.First().children.First().Prop2 = 1;
if (groups.Count > 0)
{
this.radGridView1.Templates[0].GroupDescriptors.AddRange(groups);
}
}
I hope this helps. Do not hesitate to contact us if you have other questions.
Regards,
Nadya
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