Questions on UI for WPF Forum

2 answers

477 views

Deleting Row from Grid or DataTable Associated with Grid

Hello,

When trying to delete specific rows from the WPF grid I get this error when I execute this command:

grid_name.Items.RemoveAt(<position of row to delete>);

The error is: Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead.

When I try deleting row 2 or greater from the datatable I get an error message saying that I've tried deleting an entry in the datatable that does not exist. Essentially an out of bounds error. Strangely enough I can delete the first row.

If I break the association between the grid and the datatable by doing this I can delete whatever row I want.

grid_name.ItemsSource = null;

datatable_name.Rows.RemoveAt(<position of row to delete>);

grid_name.ItemsSource = dataset_name.Tables[0].DefaultView; // I only have 1 datatable in the dataset.

Is this the correct way to delete stuff from the grid?

GridView

answered on 24 Dec 2009

3 answers

133 views

Maximum Property Problem

Hi,

I am setting the Maximum value of an NumericUpDown, but if user enters higher value, on lost focus it doesn't set value to maximum value. User needed to Focus-Unfocus the control to do this. (It works fine on first attempt, but not on next attempts...)
Am I doing something wrong ?

thanks,
dogu

NumericUpDown

answered on 24 Dec 2009

5 answers

99 views

COMBOBOX bINDING DISAPPERARS ON CLICKING ON THE CELL

I am trying to add a GridViewComboBoxColumn in radgridview dynmically usinfg the following code in my xaml.cs :

GridViewComboBoxColumn comboColumn = new GridViewComboBoxColumn();

comboColumn.DataMemberBinding = new Binding("CountryID");

comboColumn.ItemsSource = GetCountries();

comboColumn.DisplayMemberPath = "Name";

comboColumn.UniqueName = "Name";

comboColumn.SelectedValueMemberPath = "ID";

this.RadGridView1.Columns.Add(comboColumn);

private System.Collections.IEnumerable GetCountries()

{

List<Country> countries = new List<Country>();

countries.Add(new Country() { ID = 0, Name = "Germany" });

countries.Add(new Country() { ID = 1, Name = "Spain" });

countries.Add(new Country() { ID = 2, Name = "UK" });

return countries;

}

When we select some value from the combobox and move to some other cell the binding for the combobox disapperas.

Kindly let us know your view as we are in the process of evaluating telirik radgridview control for one of our future wpf product devlopment.

Thanks

Anurag.

ComboBox

answered on 24 Dec 2009

2 answers

205 views

Pie Chart Grouping

Are there any examples of how to group data using the Pie Chart? All of my attempts end with the entire pie showing just one of the possible groups.

                                SeriesMapping seriesMapping = new SeriesMapping();         
                        seriesMapping.SeriesDefinition = new PieSeriesDefinition();        
                     
                        seriesMapping.GroupingSettings.GroupDescriptors.Add(new ChartGroupDescriptor("Baker"));         
                     
                        ItemMapping itemMappingValue = new ItemMapping("PieID", DataPointMember.YValue, ChartAggregateFunction.Count);         
                        seriesMapping.ItemMappings.Add(itemMappingValue);         
                     
                        ItemMapping itemMappingKey = new ItemMapping("Baker", DataPointMember.LegendLabel);         
                        seriesMapping.ItemMappings.Add(itemMappingKey);         
                     
                        RadChart1.SeriesMappings.Add(seriesMapping);         
                     
                        List<PieTest> pies = new List<PieTest>();         
                        pies.Add(new PieTest() { PieID = 1, Baker = "John", Crust = "Corn Meal", Filling = "Chili" });         
                        pies.Add(new PieTest() { PieID = 2, Baker = "Peter", Crust = "Graham Cracker", Filling = "Cream Cheese" });         
                        pies.Add(new PieTest() { PieID = 3, Baker = "Paul", Crust = "Graham Cracker", Filling = "Chocolate Cream" });         
                        pies.Add(new PieTest() { PieID = 4, Baker = "Paul", Crust = "Flour", Filling = "Apple" });         
                        RadChart1.ItemsSource = pies;         

So with my example, how would I show a pie chart that represents how many pies each Baker baked?

Chart

answered on 23 Dec 2009

1 answer

138 views

Custom DefaultLabelFormat

Hello guys,

I want to show some statistics about the drives installed on the machine, i wanted to use a pie chart for that.

But the question is how can i make the item's label to be more pleasant .. like 23.5GB / 58KB, how can stick the appropriate string at the end (GB/MB/KB so on...).

Any suggestions?

Chart

answered on 23 Dec 2009

9 answers

216 views

Problems with column generation

Hello, I want to generate columns of grid automaticaly. Everything works good except that generated colums have no data. Here is my code:

try
{
LoadDataTable = SqlHelper.GetTable(LoadProcedureSelectName, Args);
}
catch (Exception e)
{
CreateSelectProcedure(LoadProcedureSelectName);
}
LoadData(LoadDataTable);

protected void LoadData(DataTable dataTable)

{

dataGridView1.AutoGenerateColumns = false;

dataGridView1.DataMember = null;

dataGridView1.Columns.Clear();

LoadDataTable = dataTable;

dataGridView1.ItemsSource = LoadDataTable.DefaultView;

if (dataGridView1.Columns.Count == 0)

GenerateColumns();

}

protected void GenerateColumns()

{

dataGridView1.Columns.Clear();

dt = SqlHelper.GetTable("base_Fields_SelectVisible", new string[] { "@UserID", Globals.UserID, "@TableName", _TableName });

foreach (DataRow dr in dt.Rows)

{

if (dr["Type"].ToString().Equals("string"))

{

GenerateTextBoxWPF(dr);

}

private void GenerateTextBoxWPF(DataRow dr)

{

GridViewColumn col = new GridViewColumn();

col.Name = dr["FieldName"].ToString();

col.Header = dr["Caption"].ToString();

col.UniqueName = dr["FieldID"].ToString();

col.IsReadOnly = true;

col.Width = Convert.ToInt32(dr["width"].ToString());

dataGridView1.Columns.Add(col);

if (dr["Visible"].ToString() == "1")

{

dataGridView1.Columns[dataGridView1.Columns.Count - 1].IsVisible = true;

}

else

{

dataGridView1.Columns[dataGridView1.Columns.Count - 1].IsVisible = false;

}

What i do wrong. This technique worked very well with standart wpf grid and also with devExpress grid.

GridView

answered on 23 Dec 2009

1 answer

681 views

Undo Functionality in Grid

Hello,

I've implemented an undo capability into the grid. If a user changes the value of a field but they want to reverse the change they will click on the undo button and the change is undone. This undo functionality remembers only the last change. I've implemented this using List's and by clearing out the grid and re-building the grid using the data in the lists. It works but it's slow. Imagine re-building a 2000 row X 800 column grid. I tried saving the previous state of the data in the grid in another datatable and then getting rid of the current datatable and making this datatable the current one but I ran into many problems. Because rows and columns can be deleted the datatable rejectchanges() function is of no use.

Any ideals would be appreciated.

Thanks

GridView

answered on 23 Dec 2009

2 answers

94 views

Filter search mode no more working in 2009 Q3 SP1

If you open Demo application and select Grid --> First Look --> Filter near any column. As soon as you select a dropdown "Is Equal To" to change the mode you got an excetpion: Recursive Call to Automation Peer API is not valid.

I think this is a bug related to the combobox, I opened another thread this morning related to the fact that RadCombo is raising exception in this release.

Hope this helps,

Ivan

GridView

answered on 23 Dec 2009

5 answers

295 views

drag treeview item to another control

Hello!

I am willing to buy your wpf controls, but before, I need to be sure that I do following stuff with it:

1. drag items to other controls than the treeview itself (for that case, if would be nice if I still would have the "drag tooltip")
2. being able to change the texts "drop in", "drop before", etc...
3. Do filtering (I explain here what I need):
I have the following structure:
aaa
   bbb
   ccc
      fff
ddd
   eee
I enter a filter criteria "fff". Will the node be displayed, even though the node "aaa" and "ccc" do not match the criteria?

Thanks for your quick answer.

Best regards,

Marc Wuergler

TreeView

answered on 23 Dec 2009

1 answer

77 views

Header in GridView

Hi,
We would like to place a combobox in gridview header.How can we add the template in the gridview header.Kindly let us know your feedback for the same on an urgent basis.

Thanks
Anurag

GridView

answered on 23 Dec 2009