Questions on UI for WPF Forum

9 answers

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Footer Sum - No method 'Sum' on type 'System.Linq.Enumerable' is compatible with the supplied arguments.

Hi,

I've embedded a fairly simple example of an issue we have in the greater solution.

The Context:
Using a datatable as the source.
Adding a summary row for Hours (Int32)
Get the error:No method 'Sum' on type 'System.Linq.Enumerable' is compatible with the supplied arguments.

    
            <Window x:Class="Window1"    
        
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    
        
                xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"    
        
                xmlns:telerikdata="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data" 
        
                Title="Window1" WindowState="Maximized">  
        
                <Grid> 
        
                    <telerik:RadGridView      
        
                                    AutoGenerateColumns="False"    
        
                                    HorizontalAlignment="Right"      
        
                                    IsFilteringAllowed="False"    
        
                                    CanUserFreezeColumns="False"      
        
                                    CanUserReorderColumns="False"      
        
                                    IsEnabled="True"    
        
                                    ColumnsWidthMode="Auto"    
        
                                    ShowColumnFooters="True" 
        
                                    CanUserSortColumns="False"                     
        
                                    ShowGroupPanel="False"    
        
                                    ItemsSource="{Binding Tables[Labour.EmployeeLeave]}"    
        
                                    > 
        
                        <telerik:RadGridView.Columns> 
        
                            <telerik:GridViewComboBoxColumn      
        
                                            Header="Employee"      
        
                                            DataMemberBinding="{Binding [EmpNum], Mode=TwoWay}"    
        
                                            SelectedValueMemberPath="EmpNum"    
        
                                            DisplayMemberPath="Fullname"    
        
                                            ItemsSource="{Binding}"      
        
                                            DataContext="{Binding Tables[Labour.Employee]}"/>  
        
                            <telerik:GridViewDataColumn Header="Leave Type" UniqueName="LeaveCode" /> 
        
                            <telerik:GridViewDataColumn Header="Date From" UniqueName="DateFrom" /> 
        
                            <telerik:GridViewDataColumn Header="Date To" UniqueName="DateTo" /> 
        
                            <telerik:GridViewDataColumn   
        
                                Header="Hours"   
        
                                DataMemberBinding="{Binding [Hours], Mode=TwoWay}" > 
        
                                <telerik:GridViewDataColumn.AggregateFunctions> 
        
                                    <telerikdata:SumFunction Caption="Total: " SourceField="Hours" /> 
        
                                </telerik:GridViewDataColumn.AggregateFunctions> 
        
                            </telerik:GridViewDataColumn> 
        
                            <telerik:GridViewDataColumn Header="Pay In Advance" UniqueName="PayInAdvance"/>  
        
                            <telerik:GridViewDataColumn Header="Comments" UniqueName="Comments" /> 
        
                            <telerik:GridViewDataColumn Header="Total Made" UniqueName="TotalMade" /> 
        
                        </telerik:RadGridView.Columns> 
        
                    </telerik:RadGridView> 
        
                </Grid> 
        
            </Window>

    
            Imports System.Data  
        
            Class Window1  
        
                Public Sub New()  
        
                    InitializeComponent()  
        
                    Dim ds As New DataSet  
        
                    Dim dt As New DataTable("Labour.Employee")  
        
                    Me.BuildEmployeesTable(dt)  
        
                    ds.Tables.Add(dt)  
        
                    dt = New DataTable("Labour.EmployeeLeave")  
        
                    Me.BuildEmployeeLeaveTable(dt)  
        
                    ds.Tables.Add(dt)  
        
                    Me.DataContext = ds  
        
                End Sub 
        
                Private Sub BuildEmployeesTable(ByVal dt As DataTable)  
        
                    dt.Columns.Add("EmpNum", GetType(System.Int32))  
        
                    dt.Columns.Add("Firstname", GetType(System.String))  
        
                    dt.Columns.Add("Surname", GetType(System.String))  
        
                    dt.Columns.Add("Fullname", GetType(System.String), "Firstname+' '+Surname")  
        
                    Me.AdddEmployeesRow(dt, 1, "Joe", "Blogs")  
        
                    Me.AdddEmployeesRow(dt, 2, "John", "Doe")  
        
                    Me.AdddEmployeesRow(dt, 3, "Mary", "May")  
        
                End Sub 
        
                Private Sub BuildEmployeeLeaveTable(ByVal dt As DataTable)  
        
                    dt.Columns.Add("EmpNum", GetType(System.Int32))  
        
                    dt.Columns.Add("LeaveCode", GetType(System.String))  
        
                    dt.Columns.Add("DateFrom", GetType(System.DateTime))  
        
                    dt.Columns.Add("DateTo", GetType(System.DateTime))  
        
                    dt.Columns.Add("Hours", GetType(System.Int32))  
        
                    dt.Columns.Add("PayInAdvance", GetType(System.Boolean))  
        
                    dt.Columns.Add("Comments", GetType(System.String))  
        
                    dt.Columns.Add("TotalMade", GetType(String), "Comments+Hours")  
        
                    Me.AdddEmployeeLeaveRow(dt, 1, "sss", Now, Now, 55, True, "comment")  
        
                    Me.AdddEmployeeLeaveRow(dt, 2, "sss", Now, Now, 22, True, "comment")  
        
                    Me.AdddEmployeeLeaveRow(dt, 3, "sss", Now, Now, 33, True, "comment")  
        
                End Sub 
        
                Private Sub AdddEmployeesRow(ByVal dt As DataTable, ByVal id As Integer, ByVal fname As String, ByVal lname As String)  
        
                    Dim dr As DataRow = dt.NewRow()  
        
                    dr("EmpNum") = id  
        
                    dr("Firstname") = fname  
        
                    dr("Surname") = lname  
        
                    dt.Rows.Add(dr)  
        
                End Sub 
        
                Private Sub AdddEmployeeLeaveRow(ByVal dt As DataTable, ByVal id As Integer, ByVal LeaveCode As String, ByVal DateFrom As DateTime, ByVal DateTo As DateTime, ByVal Hours As Integer, ByVal PayInAdvance As Boolean, ByVal Comments As String)  
        
                    Dim dr As DataRow = dt.NewRow()  
        
                    dr("EmpNum") = id  
        
                    dr("LeaveCode") = LeaveCode  
        
                    dr("DateFrom") = DateFrom  
        
                    dr("DateTo") = DateTo  
        
                    dr("Hours") = Hours  
        
                    dr("PayInAdvance") = PayInAdvance  
        
                    dr("Comments") = Comments  
        
                    dt.Rows.Add(dr)  
        
                End Sub 
        
            End Class

The last issue I had with datasets had a fairly simple fix. Hope this is the same.

Regards,
Nic Roche

GridView

answered on 09 Dec 2009

4 answers

135 views

RadTreeView & RadDragAndDropManager

Hi,

I'm using a RadTreeView with IsDragDropEnabled ="True" and need to limit dragging and dropping for certain items. Tried to attach to

                                RadDragAndDropManager.AddDragQueryHandler(...);         
                        RadDragAndDropManager.AddDragInfoHandler(...);         
                        RadDragAndDropManager.AddDropQueryHandler(..);         
                        RadDragAndDropManager.AddDropInfoHandler(...);         
                     

and manipulate with e.QueryResult but it does not take any effect. All the items are allowed to be dragged and dropped anywhere inside the treeview.

I followed the sample and it does work for the GridView but doesn't on a TreeView.

Thanks,

Ruben.

TreeView

answered on 08 Dec 2009

2 answers

126 views

Gridview and Multi Column Combo

Hi..
1. Do have any examples of Multi Column Combo box in a GridView?
2. How do 'select' or 'set focus' to the combo box so it is visible in a row?
3. How can I pull multiple values from the combo box and populate other columns in the selected Row with the values?

thanks in advance

GridView

answered on 08 Dec 2009

1 answer

76 views

Differences between Q2 and Q3 for selecting rows.

Hi

I have noticed that there is a difference between Q2 and Q3 on selecting a row;

In the Q2 release, the row becomes selected

when the user clicks the leftmost bar which does not have any data
when the user clicks on one of the cells in that row

In the Q3 release, the row only becomes selected when the user clicks on one of the cells in that row.

This means that the user can no longer drag data from the leftmost column which is probably the most intuitive way to do it. Is there any way to recreate this behavior in Q3?

GridView

answered on 08 Dec 2009

1 answer

76 views

Custon Aggregate function

I have a column of a datagrid called "product" that can include only two values: "new" or "old".

How can I implement a function that count only the rows where product is "new"?

Please help me!

Thanks

GridView

answered on 08 Dec 2009

1 answer

104 views

No PropertyChanged event for initially expanded item?

Hello,

we are using a RadTreeView with Columns and we see a very strange behaviour.
Some of the items of the tree view are initially expande by setting IsExpanded to true in their Constructor (we use a TreeViewModel). When a values of the properties binded to the treeView changes, it works fine for all items, except for the ones that were initially expanded. No data update is performed. It seems as if the bindings were lost.
If we remove the IsExpanded in the constructor, the binding seems to be ok, but we need to expand some of the items initially.

What can we do?

Best regards,
Jerma

TreeView

answered on 08 Dec 2009

1 answer

81 views

Prevent auto expand of treenode during drag/drop

Hi,

Our application has a Telerik Tree and Grid. We allow drag and drop between the Tree and Grid and within the tree. When we drag and drop into the tree and node over which it moves gets auto expanded. How can we prevent this?

We saw a solution for a similar problem on the ASP .NET forum.
http://www.telerik.com/community/forums/aspnet-ajax/treeview/prevent-auto-expand-of-nodes-during-drag-and-drop.aspx

Is there one for WPF?

Thanks,
-Sunandini

TreeView

answered on 08 Dec 2009

3 answers

128 views

Aligning Group Aggregates

The documentation shipped with the RadControls for WPF Q3 2009, shows an image depicting the Group Aggregates right aligned.

ms-help://telerik.windows.controls/telerik.windows.controls.gridview/gridview-grouping-aggregates.html

No where in the documentation can I find how this is accomplised.
Could this be clarified? If this can be done, how?

GridView

answered on 07 Dec 2009

2 answers

126 views

Hide negative values line

How do I hide the negative values line (the y-axis zero) introduced with the Q3.2009 version?

Thanks
Greg

Chart

answered on 07 Dec 2009

1 answer

84 views

Styling Column Filter Items

Hello,

I'm working on styling the RadGridView items to go with our color theme. I'm having trouble finding the right item to style the popup for the filter. I'm looking to change the popup corner radius, background, foreground and scroll bars. I tried using the FilterControl template. it worked but the combobox's and DistinctValuesList aren't populated with anything. Not sure what I'm doing wrong.

Thanks much
~Boots

GridView

answered on 07 Dec 2009