Re: Implementing stop functionality for downloading data from db in WPF app in MVP - WPF Discussion Boards

WCF service problem in silverlight application

Nekkantidivya8-Sep-09 22:20

8-Sep-09 22:20

Hi,

I am working on Silverlight application in this I have to upload and display the images. I implemented this using silverlight service give below. THis worked fine for small size images and for images(memory size greaterthan 60KB) it is giving me exception as

"System.Reflection.TargetInvocationException"

"An exception occurred during the operation, making the result invalid. Check InnerException for exception details."

While debuging it is not even entering in to the WCF service. The control is directly passed to the Display Results method
I anyone know any solution to upload images of any size from a silverlight application please reply me.

Method in WCF service:

public List<AdImages> GetImages(byte[] imageData,string ImagePath )
{

----------Code to save images----------

}

public class AdImages
{
public byte[] ImgData { get; set; }
}

Calling service from silverlight application

Service1Client Img = new Service1Client();
Img.GetImagesAsync(fileBytes, ofd.File.Name);
Img.GetImagesCompleted += new EventHandler<GetImagesCompletedEventArgs>(DisplayResults);

Display results method:

void DisplayResults(object sender, GetImagesCompletedEventArgs e)
{
---------code to convert bytes to image and assign it to a image control---------
}

Thanks in advance.

Re: WCF service problem in silverlight application

Arun Jacob8-Sep-09 22:30

Arun Jacob

8-Sep-09 22:30

May be because of maxBufferSize,maxReceivedMessageSize values in configuration.Check web.config for setting this values to higher value. Laugh | :laugh:

Arun Jacob
http://codepronet.blogspot.com/

WPF ToolKit Datagrid -- Urgent

avi_dadi20028-Sep-09 21:35

avi_dadi2002

8-Sep-09 21:35

Hi Everybody,
      I'm using WPFToolkit march 2009.When i bind the data to the grid dynamically.I'm getting one extra column(Empty) last , to avoid that i wrote 4 lines of code as follws,
foreach (DataGridColumn column in dgRecordSearch.Columns)
{
   if (column.Equals(dgRecordSearch.Columns.Last()))
   {
      column.Width = new DataGridLength(1.0, DataGridLengthUnitType.Star);
   }
   else
   {
      column.Width = new DataGridLength(1.0, DataGridLengthUnitType.Auto);
   }
}

But now first tome after button click I'm getting one column at first "#FF0054E3" if i click second time the same button everything is fine. only first time i'm getting this column. In my button click event i wrote the the code to bind the grid.
Sorry i forgot one thing: this problem with larrge data only , if only 2 to 20 records in my grid everything is coming fine.If more data exists this prob is coming.

Thanks in advance.

Avinash

Re: WPF ToolKit Datagrid -- Urgent

Christian Graus9-Sep-09 10:23

Christian Graus

9-Sep-09 10:23

I doubt the control is showing data unless it's there.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Implementing stop functionality for downloading data from db in WPF app in MVP

Krishna Aditya8-Sep-09 20:52

Krishna Aditya

8-Sep-09 20:52

Hi

In my WPF windows app, with MVP architecture, I have to download data from database into excel sheet with DOWNLOAD button. I have an another button STOP which has to stop the current process of downloading .

Say, for eg: I have data to download into 5 excel files, after a min or so, if i click stop button, it shuld stop at the point of downloading and by this time if it had copied to 2 files, then it should remain..

I am trying out for

1. The click of Download btn should start downloading(now its happening.. corrctly..) . But When i click stop it should stop at the point of downloading and retain the data...

2. Also, I have added an wpf progress bar.so the downloading of hte data should be linked with the progress bar data.. i mean if ti takes 170 secs to download from db, the progress bar should display the status of it..

Kindly help me.

Thank you,

Ramm

Re: Implementing stop functionality for downloading data from db in WPF app in MVP

Christian Graus9-Sep-09 10:26

Christian Graus

9-Sep-09 10:26

You need to run your download on another thread. You can then do progress notifications if it's a backgroundworker thread. To do a progress bar, you'd need to read your file a line at a time, so you know where you are at, to report progress. Or you can show progress one file at a time, and stop on that basis.

What is MVP architecture, do you mean MVC ?

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: Implementing stop functionality for downloading data from db in WPF app in MVP

Krishna Aditya9-Sep-09 21:27

Krishna Aditya

9-Sep-09 21:27

Thanks Christian for the inputs.

so, the progress bar progress should be captured based on the total time it takes to download? Add all the files downloading time and show it in progress bar as whole??

MVP is Model view presenter. earlier we have Model-View-viewModel...and instead of MVC, we can use MVP architecture too.

Presenter has the ways of presenting the user requirements.
Thank You,
Ramm

Re: Implementing stop functionality for downloading data from db in WPF app in MVP

Christian Graus10-Sep-09 14:30

Christian Graus

10-Sep-09 14:30

Krishna Aditya wrote:
so, the progress bar progress should be captured based on the total time it takes to download?

Well, it's up to you to work out what granularity of data you're capable of capturing, the point really is that I think if you have 5 files, five progress steps makes the most sense.

Krishna Aditya wrote:
MVP is Model view presenter. earlier we have Model-View-viewModel...and instead of MVC, we can use MVP architecture too

Sounds overly convoluted to me.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

how to access the layout control from view to viewmodel

anandmca8-Sep-09 20:33

anandmca

8-Sep-09 20:33

Hello,

I am new to mvvm pattern. I have problem on working with mvvm for few scenarios, related to accessing controls from view to viewmodel.

Thanks,
Anand

N.Anandababu MCA

Re: how to access the layout control from view to viewmodel

Pete O'Hanlon8-Sep-09 21:43

Pete O'Hanlon

8-Sep-09 21:43

So what's your question? You've just stated that you have some problems, and have given zero information as to what these actually are.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

3rd party control for wpf graphic editing

xkrja7-Sep-09 23:20

xkrja

7-Sep-09 23:20

I'm just starting out with a WPF-project and I need to know if there are any controls available that can be used as a WSIWYG editor for xaml objects. It should be something that can be referenced to our project and provide graphic editing for basic xaml objects. Anyone know anything about that?

Thanks for help!

Re: 3rd party control for wpf graphic editing

Richard MacCutchan8-Sep-09 1:26

Richard MacCutchan

8-Sep-09 1:26

Do you mean editing the objects within Visual Studio as you create them, or editing objects that are displayed in your application at run time? If the former then Visual Studio and Expression Blend provide these facilities.

Re: 3rd party control for wpf graphic editing

xkrja8-Sep-09 4:04

xkrja

8-Sep-09 4:04

Thanks for the reply. No, I mean like a control that you can embed in your own project. Perhaps something with xaml editing possibilities. Like a xamlPad control that can be embedded. Is there such a thing?

Thanks again!

Re: 3rd party control for wpf graphic editing

Richard MacCutchan8-Sep-09 4:48

Richard MacCutchan

8-Sep-09 4:48

Sorry, I'm not aware of any. I suggest checking all the WPF articles here on CodeProject and also Google search.

How to add text to the GridView in wpf?

Krishna Aditya7-Sep-09 20:49

Krishna Aditya

7-Sep-09 20:49

Hi,

I am developing an UI app, in WPF, for the Log window, I have xaml code

<ListView x:Name="lstViewLogWindow" ItemsSource="{Binding}" Height="152">

<ListView.View>

<GridView>

<GridViewColumn Header="Message_Name" Width="Auto" DisplayMemberBinding="{Binding Path= Message_Name}" />

<GridViewColumn Header="DateTime" Width="Auto" DisplayMemberBinding="{Binding Path= DateTime}" />

</GridView>

</ListView.View>

</ListView>

So, I have a grid view with 2 headers Message_Name and DateTime, and I want to assign the data to the 2 columns... I am not able to get the data displayed by using

lstViewLogWindow.Items.Add(msg);

Actually I want to add some msg into First col and date time into second column,

Please help me in doing this.
Thanks

Ramm

Re: How to add text to the GridView in wpf?

ABitSmart7-Sep-09 21:11

ABitSmart

7-Sep-09 21:11

By adding the item explicitly you are overriding the binding mechanism. You should do it by binding. Assign ListView's DataContext with the list of messages.Something like this,

lstViewLogWindow.DataContext = yourListOfMessages;

Re: How to add text to the GridView in wpf?

Krishna Aditya7-Sep-09 21:17

Krishna Aditya

7-Sep-09 21:17

Ya.. But its not displaying the text in 2 columns/.
I added DataContext..

                  lstViewLogWindow.DataContext = lstViewLogWindow.Items.Add(DateTime.Now);

how to add this to a particular header like DateTime

<pre>         <GridView>


                                    <GridViewColumn Header="Message Name" Width="Auto" DisplayMemberBinding="{Binding Path= Message_Name}" />
                                    <GridViewColumn Header="DateTime" Width="Auto" DisplayMemberBinding="{Binding Path= DateTime}" />

                              </GridView></pre>

Pleaes help
Thanks
Ramm

Re: How to add text to the GridView in wpf?

ABitSmart7-Sep-09 21:25

ABitSmart

7-Sep-09 21:25

You have misunderstood what I said. Assign the LIST of MESSAGE to the DataContext.
e.g.,

lstViewLogWindow.DataContext = yourListOfMessages;

where yourListOfMessagesis something like 'List<YourMessageType>' and YourMessageTypeis a type having Message_Name and DateTime property

Re: How to add text to the GridView in wpf?

Krishna Aditya7-Sep-09 21:36

Krishna Aditya

7-Sep-09 21:36

sorry..
really I couldnt get u..
actually as I have 2 columns Message Name and Datetime in my design,

yourListOfMessages will be

1. _eventAggregator.GetEvent<StatusBarMsgShowEvent>().Publish("Click on Save to save the Log window Details"); ------------ to be assigned to column1

2 . DateTime.now   ----------- to be assigned to column2...

I think I am not getting you wat U said.. but I am expecting this.. in my logwindow
---------------------------------------------------------------------------------
Message                                                               DateTime
Click on Save to save the Log window Details      09/08/2009 12:15:20AM
--------------------------------------------------------------------------------

Thank you,
Ramm

Re: How to add text to the GridView in wpf?

ABitSmart7-Sep-09 21:52

ABitSmart

7-Sep-09 21:52

This is my best attempt.

public class LogMessage
{
    public string Message_Name  { get; set; }
    public DateTime LogTime  { get; set; }
}

Then you have your list of messages like this,

List<LogMessage> messages =  new List<LogMessage>();
messages.Add(new LogMessage(){Message_Name = "Dummy Message", LogTime =  DateTime.Now});

lstViewLogWindow.DataContext = messages;

Re: How to add text to the GridView in wpf?

Krishna Aditya7-Sep-09 22:44

Krishna Aditya

7-Sep-09 22:44

HI..

Thanks for the help.
But I am doing this using subscribe and publish..

public class LogWindowMsgShowEvent : CompositePresentationEvent<string>
      {
      }

                  _eventAggregator.GetEvent<LogWindowMsgShowEvent>().Subscribe(this.ShowMessage);

               _eventAggr.GetEvent<StatusBarMsgShowEvent>().Publish("Database Connection Error");

so, in CompositePresentationEvent&lt;string&gt;
I can see a string here.. do I need to add the class Logwindow to the CompostePresentationEvent??

Actually both the CompositePresentationEvent and the presenter it accesses are in diff modules...

HOw to handle this/
Please help
Thanks
Ramm

How to handle Refresh and Reset in WPF application in MVP application [modified]

Krishna Aditya7-Sep-09 6:03

Krishna Aditya

7-Sep-09 6:03

Hi,

I am developing an windows UI application in WPF with MVP architecture with C#.

The application will interact to sqlserver and displays the data to the user.

I have 2 buttons REFRESH and RESET. which refreshes the page and resets the page to the home page respectively.

As I searched in few forums,navigationservice is recommeneded,but I couldnt see navigationservice.refresh() command

Refresh should refresh the page (current page) and the reset should reset to the homepage as per my appication.

Edited part::

My Xaml is inside Window, but not page. I think this is the main reason, I cant see it..
so , how to handle it for window??

Please help me in doing this. Thanks Ramm

modified on Tuesday, September 8, 2009 12:53 PM

Changing text from white to black for printing

DavidRen236-Sep-09 23:10

DavidRen23

6-Sep-09 23:10

The issue is simple, I am printing a visual captured from a canvas however I do not print the dark coloured background of the canvas therefore any white text inside labels, textboxes etc. are no longer visible.

Is there a best practice for solving this problem?

Re: Changing text from white to black for printing

Richard MacCutchan7-Sep-09 0:43

Richard MacCutchan

7-Sep-09 0:43

Probably best to change the white text to some other (darker) colour.

Re: Changing text from white to black for printing

DavidRen237-Sep-09 0:59

DavidRen23

7-Sep-09 0:59

Ok apologies for the ambiguity of my post to warrant such a sarcastic reply Smile | :)

I assumed it would have been a common talked about problem but maybe not.

The problem is changing the colour of certain text from white to black whilst printing since the text would not be visible on white paper.

I was hoping for suggestions on how I should implement the changes during printing.

Example have a printing state that when set fires a multi trigger defined for a textbox's style that will set any white foreground black????

Any ideas?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.