Programming with .NET - General

Add one column dynamically in datagrid

Silverlight Web Developer — Sun, 29 Nov 2009 18:32:10 GMT

I have a dataGrid that consists of 2 databinded columns.(r1 and r2) This is hardcoded like below. What I will need to do is to add one column dynamically in C# code that also have a databound property called r3.

How can that be done using C# code ? The new column will then keep these properties:

CellStyle="{StaticResource CellStyle}" Width="Auto" Foreground="White" IsReadOnly="True" Binding="{Binding r3}

1            public class BindingClass1
2            {
3                public string r1 { get; set; }
4                public string r2 { get; set; }
5            }
6    
7            <data:DataGrid x:Name="a1" GridLinesVisibility="All"  RowStyle="{StaticResource DataGridRowStyle1}" Background="Black" VerticalAlignment="Bottom" Margin="0,0,0,-25" AutoGenerateColumns="False" RowBackground="#AA000000" HorizontalGridLinesBrush="#FF141414" VerticalGridLinesBrush="#FF141414" Foreground="White" BorderThickness="1"   >
8                <data:DataGrid.Columns>
9                     <data:DataGridTextColumn CellStyle="{StaticResource CellStyle}" Width="Auto" Foreground="White" MaxWidth="35" MinWidth="25" IsReadOnly="True" Binding="{Binding r1}"/>
10                   <data:DataGridTextColumn CellStyle="{StaticResource CellStyle}" Width="Auto" Foreground="White" Header="S" IsReadOnly="True" Binding="{Binding r2}" />
11              </data:DataGrid.Columns>
12           </data:DataGrid>

Disable rowselection in datagrid

Silverlight Web Developer — Sun, 29 Nov 2009 00:18:29 GMT

I have a datagrid like this. When hovering the mouse over the grid, it displays a kind of blue selection over the rows.

What I want is to not have this selection, either when hovering the mouse or clicking in any cell in the grid. How is it possible to achieve this ?

1  <data:DataGrid x:Name="name1" Background="Black" VerticalAlignment="Bottom" Margin="0,45,0,-178" AutoGenerateColumns="False" RowBackground="#AA000000" HorizontalGridLinesBrush="#FF141414" VerticalGridLinesBrush="#FF141414" GridLinesVisibility="All" Foreground="White" BorderThickness="1"   >
2          <data:DataGrid.Columns>
3               <data:DataGridTextColumn Width="Auto" Foreground="White" MaxWidth="35" MinWidth="25" IsReadOnly="True" Binding="{Binding r1}"/>
4               <data:DataGridTextColumn Width="Auto" Foreground="White" Header="r" IsReadOnly="False" Binding="{Binding r2}" />
5          </data:DataGrid.Columns>
6  </data:DataGrid>

Invoking "AddEventListener" from C#.NET

slvrguy — Sun, 29 Nov 2009 15:39:36 GMT

Hi all, I want to call "AddEventListener" method on Silverlight object by using COM interop in C#.

I have access to Silverlight object through IXcpControl2 interface

IXcpControl2 slCtrl = ...;

Then, to find 'StackPanel1' object I can use:

1    Object stackPanelObject = slCtrl.Content.GetType().InvokeMember("FindName", BindingFlags.InvokeMethod, null,slCtrl.Content, new object[] {"StackPanel1"});

This works ok.

But how do I call "AddEventListener" on my StackPanel object. I guess something like this:

1    stackPanelObject.GetType().InvokeMember("AddEventListener", BindingFlags.InvokeMethod, null, stackPanelObject,new object[] {"MouseMove", ?????});

Can you please help...? I'm really stuck with this. Thanks

Copy of Canvas

Galaad — Wed, 25 Nov 2009 13:22:07 GMT

Hello everybody !

I've a problem with Canvas. I've an application with some Canvas which contains children add by the user. But I want to make a function to copy the contain of a canvas in another. The problem is that all the Canvas's children are from different type of UIelement (rectangle, textblock etc).

I've try this code :

foreach (UIElement elt in Canvas1.Children)
            {
                Canvas2.Children.Add(elt);
            }

But it not works, because the "elt" is already the children of Canvas1. If somebody has an idea it'll really great !

Thank You !

WSOB: Could not load type 'System.Windows.Controls.ChildWindow' in Application_UnhandledException

hudgeo — Wed, 27 May 2009 15:19:46 GMT

I started getting the lovely WSOB (White Screen Of Blank) suddenly and noticed that none of my breakpoints were being hit in Application_UnhandledException or any of the loaded / completed events. After checking the FireFox Error Console I noticed the below error. The ErrorWindow worked fine before, not sure why it can't seem to load it now. Any ideas?

Error: Sys.InvalidOperationException: ManagedRuntimeError error #4004 in control 'Silverlight1': System.TypeLoadException: Could not load type 'System.Windows.Controls.ChildWindow' from assembly 'System.Windows.Controls, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
   at ChartSummary.Silverlight.App.Application_UnhandledException(Object sender, ApplicationUnhandledExceptionEventArgs e)
   at MS.Internal.Error.CallApplicationUEHandler(Exception e)
   at MS.Internal.Error.GetXresultForUserException(Exception ex)
Source File: http://localhost:64917/ScriptResource.axd?d=WBi8venOLETlDB6tESAGU0h1Tm0LJPDkj6Z6aDs6QRVhE1-7Vmyz7wncruSUXvx7gKH5VKOhNqdOOFRSzKTyKA2&t=3bb1633f
Line: 461

MembershipProvider methods exposed in System.Web.ApplicationServices.AuthenticationService

spatemp — Sun, 29 Nov 2009 16:38:54 GMT

I exposed Authentication service on my website. I followed the following article http://blogs.msdn.com/brada/archive/2008/05/03/accessing-the-asp-net-authentication-profile-and-role-service-in-silverlight.aspx . So, that my silverlight app can call the services in it.

My question is are all methods in MembershipProvider class are they exposed in Authentication service. It does not seem like it. What am I missing.

How to use OpenFileDialog() with ICommand pattern

kobruleht — Sun, 29 Nov 2009 16:14:17 GMT

I tried to use ShowDialog with http://blogs.infragistics.com/blogs/josh_smith/archive/2008/11/18/putting-silverlight-commands-to-use.aspx
command pattern using command code below.

Sometimes to button causes exception "command should initiated by user action only".
How to fix ?

Andrus.

        public RelayCommand UploadPictureCommand
        {
            get
            {
                if (_uploadCommand == null)
                    _uploadCommand = new RelayCommand(
                        () =>
                        {
                            OpenFileDialog ofd = new OpenFileDialog() { Filter = ("Picture (*.jpg)|*.jpg") };
                            if (ofd.ShowDialog() != true)
                                return;
...

XDocument Question

arunairs — Sun, 29 Nov 2009 14:49:26 GMT

Hi, I have a web service that returns the following xml: John Doe 85244 I have Customer class and I am trying to build a customer object from the above xml: Stream stm = e.Result; XDocument doc = XDocument.Load(stm); //doc contains the xml show above var c = from m in doc.Root.Elements("Customer") select new { FirstName = (string)m.Attribute("FirstName").Value, LastName = (string)m.Attribute("LastName").Value, Zip = Convert.ToInt32((string)m.Attribute("Zip").Value) }; Customer cust = c; foreach (var cu in c) { cust.FirstName = cu.FirstName; cust.LastName = cu.LastName; cust.Zip = cu.Zip; } The problem here is the program never goes inside the for each loop, even though doc contains the xml shown above. there is only one Customer returned always. What am I doing wrong? Also, since there is only one customer returned always, is there a way I can avoid the foreach loop? thanks, Arun

How can I just send query variables to a php page???

tvance929 — Sun, 29 Nov 2009 02:19:47 GMT

I am trying to send some info via the query string so I tried making a webclient AND then using a string

string url = "http://www.toddvance.com/silverlight/bingmaps/silverCities.php?text=" + cityState + "|" ;

then calling both the OpenWrite and the OpenReadAsyn methods... I added the completed methods and hit the completed methods...

I debugged and found that the query string made is in the correct format and that if I were to copy it in a browser and go, it would work appropriately... but when I run the program (and the XAP and PHP page are all in the same directory on my server -- APACHE) it doesnt work ... I dont get any errors it just doesnt do what the PHP script is supposed to (which is write the values passed to a text file).

HERE is the call:

                 string url = "http://www.toddvance.com/silverlight/bingmaps/silverCities.php?text=" + cityState + "|" ;
                addCityClient.OpenReadCompleted +=new OpenReadCompletedEventHandler(addCityClient_OpenReadCompleted);
                addCityClient.OpenReadAsync(new Uri(url));

I am not sending anything back --- I just want to hit that PHP script with that query variable... .any help???

**Just tried the Download string method and am getting back a SecurityException... hmmm...

call functions in ASP.NET c#

lordbaltz — Sun, 29 Nov 2009 10:54:50 GMT

Hello

I am trying to make calls to the C# code of the ASP.NET page from silverlight but i cant find any way to do this.

Is there any way to directly make such calls?

If not can i use javascript to call c# functions and get their return values ?

Thanks a lot

A problem of Validation Exception in SL3, urgency!

guozili — Sun, 29 Nov 2009 06:53:59 GMT

1.entity class

"Name"s setter include:
if (value == string.Empty)
throw new Exception("name shouldn't be null");

2. usercontrol_loaded:

currentEntity = new Entity();

this.DataContext = currentEntity;

3.and button event:
ClearName(.....){

currentEntity.Name = string.Empty; //

//i want to clear name's value as null, but it will enter entity setter and throw a UnhandledException, which lead to silverlight application crush

//so, is any solution to ignore the exception

}

Clearing Accordion Items throws ArgumentOufOfRange exception

sl_3478 — Tue, 24 Nov 2009 20:26:40 GMT

I have my program add some items to an Accordion that is definedi n XAML. After one of them is selected, I do some work and need to update the AccordionItems in the Accordion. If I call the this.myAccordion.Items.Clear() (otherwise I will keep duplicating accordionItems in list) I get the exception mentioned in the title. Now I found out this is because I have an AccordionItem (AI) selected. So I do this.myAccordion.SelectedItems.Clear() before this.myAccordion.Items.Clear() and while I do not get the exception and my newly created AI items load in the Accordion, the contents of these accordionItems does not appear. When I click an AccordionItem, i have the content autogenerated. When I step through this code it works fine and properly sets the selected Ai.content value with my auto-gen content, but the content does not visually appear....the accordionItem contents never exapnds essentailly. I do not get any errors.

Is there any known issue with adding autogeneterated AI items to an accordion, removing them, and adding new ones?

//also, my environment is VS2008, SL3, Expression 3, .Net 3.5 SP1, and Win7, if that helps

Cannot find 'ServiceReferences.ClientConfig'

weverton — Fri, 23 Oct 2009 10:43:15 GMT

Hi Guys, When I'm starting my SL app, I'm getting the following error: Detalhes dos erros da página da Web Agente de Usuário: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; .NET CLR 3.5.30729; MS-RTC LM 8; .NET CLR 3.0.30729) Carimbo de data/hora: Fri, 23 Oct 2009 10:40:49 UTC Mensagem: Unhandled Error in Silverlight Application Code: 4004 Category: ManagedRuntimeError Message: System.InvalidOperationException: Cannot find 'ServiceReferences.ClientConfig' in the .xap application package. This file is used to configure client proxies for web services, and allows the application to locate the services it needs. Either include this file in the application package, or modify your code to use a client proxy constructor that specifies the service address and binding explicitly. Please see inner exception for details. ---> System.Xml.XmlException: Cannot open 'ServiceReferences.ClientConfig'. The Uri parameter must be a relative path pointing to content inside the Silverlight application's XAP package. If you need to load content from an arbitrary Uri, please see the documentation on Loading XML content using WebClient/HttpWebRequest. ---> System.ArgumentException: Application object is not initialized. ... at System.ServiceModel.ClientBase`1.CreateChannelFactoryRef(EndpointTrait`1 endpointTrait) at System.ServiceModel.ClientBase`1.InitializeChannelFactoryRef() at System.ServiceModel.ClientBase`1..ctor() at Tron.InovaTron.Apresentacao.ServicoDeRelatorioServiceReference.ServicoDeRelatorioClient..ctor() at Tron.InovaTron.Apresentacao.App..ctor() Linha: 56 Caractere: 13 Código: 0 URI: http://localhost/Tron.InovaTron.Apresentacao.Web/Default.aspx I looked at SL project and the file ServiceReferences.ClientConfig is there and inside the xap too. Where else can I look to solve this problem?? Thanks,

Canceling an async wcf request

Savij — Thu, 26 Nov 2009 00:38:05 GMT

I have created a cascading combo box control. When you select an item in the first box, the second box populates with related data to the first selection. For instance if it were car makes and models, choosing a make, would allow the models combo to populate with models of that make.

Using the above example, the issue I have is that if the models combo is getting it's data (via wcf async) and the user chooses another selection in the makes combo box, there is a short period of time when the first selections query comes back, and the second selections query begins. The user could during that time select a model that does not belong to the current selected make.

I could disable the whole control while it retreives its data, but I think it would "feel" better to a user if I could just cancel the first query and start a new one. Is this possible? What is the standard way of handling related user input in this manner?

Thanks,

Savij

silverlight database

criurs — Sat, 28 Nov 2009 14:56:33 GMT

hi, Does anybody know a database engine to store data/objects in IsolatedStorage on client machine? I just looked at db4o but has some disadvantages: I cannot use LINQ to retrieve objects and performance is quite bad. I need something small,fast and easy to use, any other vendors?

Getting rid of the blue border around a DataGrid cell.

Aaron Edwards — Sat, 28 Nov 2009 19:52:44 GMT

Does anyone know the property that is setting this light-blue border in the DataGrid below? It appears in the first cell when the page is first loaded, and in the selected cell if you select a different cell. My XAML is pasted below. Thanks in advance.

Aaron

                                <data:DataGrid x:Name="dgStaffInterested" AutoGenerateColumns="False" ItemsSource="{Binding staffInterested}" HeadersVisibility="Row"
                                    GridLinesVisibility="Horizontal" MaxHeight="100" HorizontalAlignment="Left" Width="200" >
                                   <data:DataGrid.Columns>
                                        <data:DataGridTemplateColumn Header="Staff Name" >
                                            <data:DataGridTemplateColumn.CellTemplate>
                                                <DataTemplate>
                                                    <TextBlock Text="{Binding staffMember.staffName}" Width="140" />
                                                </DataTemplate>
                                            </data:DataGridTemplateColumn.CellTemplate>
                                            <data:DataGridTemplateColumn.CellEditingTemplate>
                                                <DataTemplate>
                                                    <TextBlock Text="{Binding staffMember.staffName}" />
                                                </DataTemplate>
                                            </data:DataGridTemplateColumn.CellEditingTemplate>
                                        </data:DataGridTemplateColumn>
                                    </data:DataGrid.Columns>
                                </data:DataGrid>

Read the last line of a file

Silverlight Web Developer — Sat, 28 Nov 2009 15:05:47 GMT

I am searching for a way to read the last line in a text file. What I dont want to do is to read the whole file from top to bottom and save the last line because this will not be effecient.

What I think I need to do is to read character by character backwards in the file until a "\n" or the beginning of file is reached and start reading the file from here and then catching the line.

I am not sure how I will do this ? I am searched long time for a straight forward example but havent found this yet. Normally how I read the file now is like this:

1                IsolatedStorageFile isg = IsolatedStorageFile.GetUserStoreForApplication();
2                
3    		String Path = "file1.txt";
4    		IsolatedStorageFileStream hr = new IsolatedStorageFileStream(Path , FileMode.Open, FileAccess.ReadWrite, isg);
5                StreamReader Readfile = new StreamReader(hr);
6

Localization SL3 how do I change the cuture from a loaded app

Brett Styles — Mon, 23 Nov 2009 04:35:58 GMT

I have the resources assemblies working correctly and I am using the suggested pattern in the Microsoft docs. When I change the culture on start-up it all works fine, but I want the user to also have the choice of selecting the language after startup.

Content="{Binding LocalResources.logon_password, Source={StaticResource LocalizedStrings}}"

Now I want the user to choose the language from a combo box and the localized textblock and buttons to update.

I have tried InvalidateMeasure and InvalidateArrange but they do not force a rebind. I have tried seting LocalizedStrings with INotifyPropertyChanged and raising a PropertyChanged event but I figure since it is marked as Static that probably would not work.

Has anyone have any suggestions on how I can get all my localized resources to update to reflect the user's selection?

Silverlight viewmodel and an childwindow

keesschouten — Sat, 28 Nov 2009 12:34:19 GMT

Hi guys,

At the moment i'm using the viewmodel pattern like the viewmodel on this page of Brad Abrams. So far i used it succesfull on all kinds of pages. But now i wanna open an childwindow with de the details of an item in a datagrid. The childwindow dataform will have much more data then the datagrid. What i wanna know is:

Do i have to make an different new viewmodel for this childwindow and pass the id of the selected item to this childwindow?

Or is better to pass the current viewmodel to the childwindow and use that viewmodel in the chilwindow to retrieve the selected item.

Thanks in advance!

Using media element to play local files

jgnjs — Thu, 26 Nov 2009 13:50:14 GMT

Hi, I am a newbie in silverlight and I have problems trying to get the video that is saved in my D drive to play. When I run the page nothing happens. Here is my code.

public MainPage()
        {

            InitializeComponent();
            string test = "D:/user/Life.wmv";

            myVideo.Source = new Uri(test, UriKind.Relative);
        }

However if i set my string test = "Life.wmv" the video will play.

Any idea how can I play the video in my D drive?

Thanks

passing value from parent to child window

gnop — Fri, 27 Nov 2009 21:40:11 GMT

Hi, im having trouble finding a way to pass a value from the parent to child window. ive seen many examples of child to parent but not the other way around. Any help would be appreciated

Thanks

Good ways to update UI? (no more stuttering!)

bschmidt — Wed, 14 Oct 2009 16:41:07 GMT

Hello, I've recently started learning what Silverlight has to offer in terms of charting and while I like what I've been able to find out thus far there is one thing that I haven't been able to find out yet - is there a good way to update charts (ie. have them redrawn) without affecting the other controls on the screen?

Currently I have a news ticker like object on the bottom of my app which is just two textblocks being animated. Above that is a chart that I have updating with new information from a database every second and while it only shows the last 50 or so records, re-rendering the chart with the new information causes the ticker on the bottom to pause until the chart has finished rendering.

My first thought was to have it re-render in a separate thread but I'm not sure if Silverlight would support that. Has anyone experience a problem like this and found a work-around?

Thanks!

UI Bind radiobutton.IsClicked in listbox itemtemplate

tonyedmo — Tue, 24 Nov 2009 00:24:10 GMT

Ok we have a listbox which lists a RadioButton, Textblock and Image. Our problem is trying to link the listitem.isselected to the radiobutton.ischecked. We have tried many many different methods to do this and are now at our wits end. Below is a mock up, without the image portion. If anyone could give us a kick in the right direction, it would be greatly appreciated.

Code behind:

   17 public MainPage()

   18         {

   19             InitializeComponent();

   20             lb.Items.Clear();

   21             lb.ItemsSource = "test1,test2,test3".Split(new char[] {',' });

   22         }

xaml:

 <UserControl.Resources>
        <DataTemplate x:Key="dt" >
            <ListBoxItem Background="Black" MouseLeftButtonDown="listBoxItem_MouseLeftButtonDown">
                <RadioButton   GroupName="rbtest">
                    <StackPanel>
                        <TextBlock Text="{Binding}" Foreground="White"  />
                    </StackPanel>
                </RadioButton>
            </ListBoxItem>
        </DataTemplate>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot">
        <ListBox x:Name="lb" SelectionChanged="lb_SelectionChanged" 
                 ItemTemplate="{StaticResource dt}" >
        </ListBox>
    </Grid>

The remote server returned an error: NotFound

cmant — Tue, 24 Nov 2009 07:35:23 GMT

I am geting error.

my web service code is this , and whin i call this method it showes error.

[WebMethod]public DataTable CreateDT()

{

DataTable dt = new DataTable();

dt.Columns.Add("Name");

dt.Columns.Add("Age");

DataRow dr;

dr = dt.NewRow();

dr[0] = "Cmant";

dr[1] = "23";

dt.Rows.Add(dr);

dt.WriteXml("~/test.xml");return dt;

}

my .xaml.cs code

DataServiceSoapClient proxy = new DataServiceSoapClient();

proxy.HelloWorldCompleted += new EventHandler<HelloWorldCompletedEventArgs>(proxy_HelloWorldCompleted);

proxy.HelloWorldAsync();

void proxy_HelloWorldCompleted(object sender, HelloWorldCompletedEventArgs e)

{

XDocument doc = XDocument.Load("~/test.xml");

var myData = from info in doc.Descendants("Table")

select new Person

{

FirstName = info.Element("Name").Value,Age = info.Element("Age").Value

};

grdShow.ItemsSource = myData;

txtname.Text = e.Result.ToString();

}

And Error show on Reference.cs file(Default file)

public SilverlightDB.sappleDB.HelloWorldResponse EndHelloWorld(System.IAsyncResult result) {

object[] _args = new object[0];

SilverlightDB.sappleDB.HelloWorldResponse _result = ((SilverlightDB.sappleDB.HelloWorldResponse)(base.EndInvoke("HelloWorld", _args, result)));return _result;

}

Help me someone

Using TransitionControl with Page Class

tvadik — Thu, 26 Nov 2009 07:27:12 GMT

Hello everyone :)

I was wondering how could i use the Transition Control in conjuction with the Page and Frame Class so that i could display a transition effect when changing page.

And one more thing, is the transition control the right way of doing it? thanks!