Re: Custom control derived from DataGrid - WPF Discussion Boards

Re: UserControl in MVVM w/ no code behind? is it possible?

21-Jun-11 21:08

Remember that your .xaml.cs class is a partial class. The .g.cs class is the other half of the partial class, and it's generated to hook into baml - hence, it's kind of important to have the InitializeComponent in there.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Abhinav S21-Jun-11 21:22

Abhinav S

21-Jun-11 21:22

SledgeHammer01 wrote:
InitializeComponent

This needs to be called. SO you wont be able to remove it.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

NullReferenceException was throwm on 'Groupbox'

AmbiguousName20-Jun-11 18:20

AmbiguousName

20-Jun-11 18:20

hello guys... I have three tabs on which some of the GUI is same. So when I was done with tab1, I simple copied the some of the code in tab2, but off course changing some of the values and thier coordinates. But this act shows me above mentioned exception? Here is some of the code I copied.

///// Tab 1
<groupbox:GroupBox Header="Batch Details" Height="120" Width="430" Margin="0,10,800,0" >
<StackPanel>
<sdk:Label Height="28" Name="lblBatch" Width="50" Content="Batch Id:" Margin="-75,0,300,0"/>
<TextBox Height="20" Width="90" Margin="-130,-30,100,0" Name="txtBatch"></TextBox>
<sdk:Label Height="28" Name="lblCreatedBy" Width="65" Content="Created By:" Margin="-70,-30,0,0" />
<TextBox Height="20" Width="120" Margin="117,-30,0,0" Name="txtCreatedBy"></TextBox>
<TextBlock Height="20" Width="75" Margin="320,-27,0,0" Name="txtblkDate" Foreground="Blue">2011-05-12</TextBlock>
<sdk:Label Name="lblOperator" Height="28" Width="55" Margin="-365,0,0,0" Content="Operator:"></sdk:Label>
<TextBox Height="20" Width="100" Margin="-210,-25,0,0" Name="txtOperatorVal" IsReadOnly="True"></TextBox>
<TextBox Height="20" Width="240" Margin="140,-25,0,0" Name="txtOperatorVal2" IsReadOnly="True"></TextBox>
<sdk:Label Content="Approval: " Height="28" Width="55" Margin="-360,0,0,0"></sdk:Label>
<TextBox Height="20" Width="240" Margin="-65,-25,0,0" Name="txtApproval" IsReadOnly="True"></TextBox>
<TextBox Height="20" Width="100" Margin="285,-25,0,0" Name="txtApproval2" IsReadOnly="True"></TextBox>
</StackPanel>
</groupbox:GroupBox>


///// Tab 2
<groupbox:GroupBox Header="Batch Details " Height="120" Width="430" Margin="0,10,800,0">
<StackPanel>
<sdk:Label Height="28" Name="lblBatchOpr" Width="50" Content="Batch Id:" Margin="-75,0,300,0"/>
<TextBox Height="20" Width="90" Margin="-130,-30,100,0" Name="txtBatchOpr"></TextBox>
<sdk:Label Height="28" Name="lblCreatedByOpr" Width="65" Content="Created By:" Margin="-70,-30,0,0" />
<TextBox Height="20" Width="120" Margin="117,-30,0,0" Name="txtCreatedByOpr"></TextBox>
<TextBlock Height="20" Width="75" Margin="320,-27,0,0" Name="txtblkDateOpr" Foreground="Blue">2011-05-12</TextBlock>
<sdk:Label Name="lblOperatorOpr" Height="28" Width="55" Margin="-365,0,0,0" Content="Operator:"></sdk:Label>
<TextBox Height="20" Width="100" Margin="-210,-25,0,0" Name="txtOperatorValOpr" IsReadOnly="True"></TextBox>
<TextBox Height="20" Width="240" Margin="140,-25,0,0" Name="txtOperatorVal2Opr" IsReadOnly="True"></TextBox>
<sdk:Label Content="Approval: " Height="28" Width="55" Margin="-360,0,0,0"></sdk:Label>
<TextBox Height="20" Width="240" Margin="-65,-25,0,0" Name="txtApprovalOpr" IsReadOnly="True"></TextBox>
<TextBox Height="20" Width="100" Margin="285,-25,0,0" Name="txtApproval2Opr" IsReadOnly="True"></TextBox>
</StackPanel>
</groupbox:GroupBox>

So on tab2, it shows me a NullReferenceException thrown on GroupBox. Whats wrong? thnx

Re: NullReferenceException was throwm on 'Groupbox'

SledgeHammer0121-Jun-11 6:26

SledgeHammer01

21-Jun-11 6:26

No idea with that wall of text lol. Two ways to go about fixing it: 1) turn on first chance exceptions and see if you get any further info 2) delete tab2 and add the controls back one by one til you see which one is throwing.

Re: NullReferenceException was throwm on 'Groupbox'

Pete O'Hanlon21-Jun-11 6:30

Custom control derived from DataGrid

21-Jun-11 6:30

I would assume that the null reference is actually being thrown by one of the fields you are using to fill the TextBoxes.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Nitsan Selinger19-Jun-11 21:12

19-Jun-11 21:12

Hi,
trying to create a custom control derived from DataGrid.
At this point I want to have the same fuctionalaty as DataGrid.

I created A Custom Control derived from DataGrid:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ZivControls
{

public class ZivGrid : DataGrid
{
static ZivGrid()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ZivGrid), new FrameworkPropertyMetadata(typeof(ZivGrid)));
}

}
}

Can someone please write the Generic.xaml so that the new custom control will have the same fuctionalaty as DataGrid (improving the control is my next step).

Thanks

Nitsan

BobJanova20-Jun-11 4:42

BobJanova

20-Jun-11 4:42

You already have the same functionality as the DataGrid.

I believe you can find the XAML template for the base classes on MSDN. If you want to modify the style, start from there. The DataGrid template is (obviously) pretty complex, no-one is going to modify it in exactly the way you want except you. Get to it.

Nitsan Selinger20-Jun-11 5:07

20-Jun-11 5:07

I already have the default style (very difficult task for it self) of the Datagrid. But when you set (with changes to the new object name) it as the generic.xaml of the new control it is a mess.

As a Delphi programer who use to derive class so simply, I am so disappinted how dificult it is to derive the Datagrid class.

Pete O'Hanlon20-Jun-11 5:08

20-Jun-11 5:08

Why do you feel the need to derive from it? One of the principles behind WPF and Silverlight is that you have new ways to extend the controls without having to extend it. 9 times out of 10, when somebody attempts to derive a control it simply means that they aren't aware of a simple way to extend it.

If you tell us what you are trying to achieve, we may be able to help.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Nitsan Selinger20-Jun-11 19:45

20-Jun-11 19:45

Hi,
I want to have a TextBox above the DataGrid that will be used for incremental search on the selected field in the DataGrid. This feuture must be built-in the grid control.

Pete O'Hanlon21-Jun-11 6:28

21-Jun-11 6:28

Why must the TextBox be built into the grid control? You could simply host your DataGrid inside a Grid with two rows, and set the first row to contain the TextBox.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Nitsan Selinger21-Jun-11 7:27

21-Jun-11 7:27

The incremental search (which is one example) is a must for every datagrid in my applications and I use a lot of datagids some are created by code in runtime so you don't want to create the textbox and write all the code to do the search every time.
The most important thing in deriving the datagrid which is a very important control in my application is the ability to improve the datagrid all the time and all your applications get the benefit from it withot chaging your source code.

Pete O'Hanlon21-Jun-11 7:40

21-Jun-11 7:40

So just wrap it in a UserControl and use that. Seriously, you'll save a lot of heartache and effort over retemplating the DataGrid.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Nitsan Selinger21-Jun-11 19:41

21-Jun-11 19:41

When wraping to User Control you are losing all the DataGrid design time properities and events. If there was an easy way to expose all the DataGrid properties then User Control will be graet.

Pete O'Hanlon21-Jun-11 21:01

21-Jun-11 21:01

Then you're on your own mate. We've tried to offer practical ways around this, but if you're absolutely set on retemplating then fly at it. You can download the DataGrid template from Microsoft.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Nicolai Schrade6-Jul-11 5:52

Nicolai Schrade

6-Jul-11 5:52

You could also just alter the DataGrid Header Style.
For my purposes, I took this one and modified it:
Automatic WPF Toolkit DataGrid Filtering[^]

How to Group Controls[solved]

BobJanova20-Jun-11 7:32

BobJanova

20-Jun-11 7:32

I'm not sold on Silverlight/WPF's approach to controls, either, to be honest. Inheriting from WinForms controls is more comparable to Delphi and I find it nicer, in general.

AmbiguousName19-Jun-11 20:08

AmbiguousName

19-Jun-11 20:08

hello guys... I am having difficult time and am unable to find the panel control (in Silverlight) inwhich we can group some of the controls (like labels, textboxes and buttons) and then name that group in top left corner of that panel. How to get/add/find that control and add on the silverlight app? thnx

Re: How to Group Controls

rajesh123110319-Jun-11 20:22

rajesh1231103

19-Jun-11 20:22

u can use stackpanel for this... and for groupbox a free dll is available in codeplex u can google it n use it...

Re: How to Group Controls

DSB-Sven19-Jun-11 22:42

DSB-Sven

19-Jun-11 22:42

Have u tried System.Windows.Controls.GroupBox?

Just right-click anywhere in your tool box and then "select items" (or is it "select elements" I'm using the german version of VS2010) and type groupbox in the filter text box. Then select "GroupBox", click ok and you'll find it in the tool box. (The icon shows a small box labeled "XY")

WCF Service called twice..

NTheOne17-Jun-11 0:54

NTheOne

17-Jun-11 0:54

Hello All,

I have strange problem. I have used WCF services in my Silverlight applications. Sometimes, WCF service called twice.
I have set following properties for the BasicHttpBinding.

-- binding.MaxBufferSize = Int32.MaxValue;
-- binding.MaxReceivedMessageSize = Int32.MaxValue;

For overcoming such type of situations, I have unregistered the WCF method call and its working fine. Is it proper solutions for that?

It would be gr8 if anyone can explain me, why such type of issue happens.

Re: try this

Pete O'Hanlon15-Jun-11 23:39