Questions on UI for WinForms Forum

3 answers

212 views

[Solved] RadGridView Auto-Selecting Item When Item Is Added/Removed In ObservableCollection

Having a bizarre issue with RadGridView where it seems to randomly be selecting items in the grid when the underlying ObservableCollection is changed. My desired behavior is the "CurrentItem" becoming null when the selected item is removed from the underlying collection, and obviously for the GridView not to select an item when added when the selection is blank. My code is as follows:

radGridView1.AutoExpandGroups = true;
            var gd = new GroupDescriptor();
            gd.GroupNames.Add("RandomProp1", ListSortDirection.Ascending);
            radGridView1.GroupDescriptors.Add(gd);
            var sd1 = new SortDescriptor("RandomProp2", ListSortDirection.Descending);
            radGridView1.SortDescriptors.Add(sd1);
            var sd2 = new SortDescriptor("RandomProp3", ListSortDirection.Ascending);
            radGridView1.SortDescriptors.Add(sd2);
            radGridView1.MultiSelect = false;
            radGridView1.DataBindingComplete += RadGridView1_DataBindingComplete;
            radGridView1.DataSource = App.MasterList;

private void RadGridView1_DataBindingComplete(object sender, Telerik.WinControls.UI.GridViewBindingCompleteEventArgs e)
        {
            Log.WriteLine("RadGridView_DataBindingComplete");
            radGridView1.CurrentRow = null;
            radGridView1.CurrentRowChanged += RadGridView1_CurrentRowChanged;
        }

When the underlying collection is being changed, I'm doing the following:

BeginInvoke on the main thread

Locking the collection

Updating items as such:

DynamicCollection[i] = new CustomObject(fillerProperties);

Is the above possibly the issue? I know this is the correct way to update ObservableCollections in WPF when bound to a GridView, not sure if WinForms behaves differently.

GridView

answered on 06 Mar 2020

2 answers

134 views

Grouped row not updating in hierarchy with BindinList

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?

GridView

answered on 06 Mar 2020

2 answers

198 views

Loading time when changing the content of a RadPanel

Hello,

I have a list of items in a RadPageViewPage, in which I can select an item. A specific view for the selected item, depending on its type, is displayed in another RadPageViewPage. I then have to change the content of the panel in the second RadPageViewPage depending on the selected item, which is done simply with the following code:

1 UserControl userControl = new UserControlRobotActionProcess();
2 userControl.Parent = radPanel1;

I observed it took quite long to display the UserControl in the panel and measured the time of the line of code 2 above: 400ms. I then tested to display the same control, but with standard WinForms controls instead of the Telerik ones. The same line of code takes 1ms.

I think that the views I use could be optimized and could be loaded faster. I attach a screenshot of the view I have loading time issues with. Here is also the list of Telerik controls I use:

- RadSpinEditor

- RadPanel

- RadPageView

- RadPageViewPage

- RadLabel

- RadGroupBox

- RadButton

- RadRadioButton

- RadCheckBox

- RadTextBox

Do you know if I can improve the loading time of this UserControl?

Please feel free to tell me if you need more information.

Kind regards,

Antoine

Panel

answered on 06 Mar 2020

1 answer

588 views

How to change row color in radgridview

Hello, we have a program requirement where the user can select one or multiple rows and then choose to "highlight" those rows from a given set of colors.
This process can be repeated multiple times allowing the user to color code rows in different colors at a time.
The work flow ->
User selects rows
User then chooses the Highlight Rows menu option which is a drop down for different colors.
The rows background are then set to that color.

Rinse -> repeat as the user sees fit.

There is also a reset option that resets all the rows back to the default colors.

I did not see how to perform this specific type of background color assignment in either the Formatting Rows or Conditional Formatting Rows help sections.

If you could please help us understand how to perform this specific kind of row formatting, it would help us to be able to convert to the Telerik RadGridView from our previous 3rd party grid control.

GridView

answered on 05 Mar 2020

3 answers

244 views

How to Restore Default Crystal Theme Variation Accent Color Sets

Good Morning,

When generating a Crystal Theme Variation, there are several accent color palettes to choose from.

I accidentally overwrote the Blue one. How can I restore the Blue Palette?

Thank you

Themes and Visual Style Builder

answered on 05 Mar 2020

6 answers

394 views

Export with Console Application

Hi,

Is it possible to databind a grid and exports it to excel from a ConsoleApplication project ?

I tried the LoadElementTree method, that doesn't work, I can't get my grid populated with data using the datasource member.
The only working method what the Grid.Rows.Add.

The other issue is that the ExportVisualSettings can't be set to true or you'll get an exception.

Is there a clean way to get it to work ?

Thanks,

GridView

answered on 05 Mar 2020

2 answers

171 views

Chartview PieChart

If I have two pie charts next to each other how do I make their circumference the same size.

I have tried Chartview.View.Margin. Setting it to the same value does not make them the same size.

ChartView

answered on 04 Mar 2020

3 answers

1.3K+ views

Problem with dd-MM-yyyy date format

Hello

I have DateTimePicker with date in format dd-MM-yyyy. Initial date in this control is 01-02-2020. I want to write new date (31-01-2020) in MaskEdeditBox but after set day cursor correctly move to month section and day section changes walues to '01'. Could I define other behavior for this situations? For example when currently set month not has enough days month automatically decreases by 1.

Best wishes

Calendar, DateTimePicker, TimePicker and Clock

answered on 04 Mar 2020

2 answers

163 views

Chartview format seconds

Hi,

I'm currently working with a chartview where the y-axis contains seconds. I',m trying to convert the seconds to minutes and/or hours, depending on rather the amount of seconds is more or equal one or more hour/s.

How can I achieve this behavior?

Thanks in advance!

ChartView

answered on 03 Mar 2020

1 answer

246 views

Radscheduler time display issue

Hi,

We are setting the ResourcesPerView property as 3 for the rad-scheduler on code behind.
rdSched.ActiveView.ResourcesPerView = 10

Screeshot link
If it is not set, it shows 2 columns. But in existing project, it displays all the columns as mentioned on the below screenshot.
Existing Screenshot link
Without setting the ResourcesPerView is it possible to display the columns as per the screenshot?

Scheduler and Reminder

answered on 02 Mar 2020