WPF Discussion Boards

Pete O'Hanlon19-Apr-10 8:56

19-Apr-10 8:56

I would tend to read the data in using a background worker and marshall the image back to the UI thread once it's been read in. Whenever you see a UI that's stopped responding, you're seeing one that needs to have some threading in place.

"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

Re: Preload ImageSource from URI

ezazazel20-Apr-10 6:22

ezazazel

20-Apr-10 6:22

That's true, for sure - but as a matter of fact up to now wpf is doing the black magic (inclluding the dispatching), I'm just passing an uri.
Can this be done with some sort of lazy loading (heard once of that during a dev training) or other obsurce xaml tags?
Or is creating an image out of the uri (including the preloading) and passing it to the xaml as imagesource the better way? Won't the problem keep existing as the dispatcher has to deal with the pictures and their transformation-rotation anyway?

Re: Preload ImageSource from URI

Leung Yat Chun26-Apr-10 10:14

Leung Yat Chun

26-Apr-10 10:14

Have you tried WritableBitmap? you can return a empty WritableBitmap, start a thread to load your URI, then when the loading is finished, update it back through Dispatcher :

writeBitmap.Dispatcher.Invoke(DispatcherPriority.Background,
new ThreadStart(delegate
{
//UI Thread
Int32Rect outRect = new Int32Rect(0,
(int)(writeBitmap.Height - height) / 2, width, height);
writeBitmap.WritePixels(outRect, bits, stride, 0);
}));

Thats what I did for my FileToIconConverter.

QuickZip

Showing an external image in Expression Blend or Visual Studio ?

Mohammad Dayyan18-Apr-10 20:43

Mohammad Dayyan

18-Apr-10 20:43

I have an image lock.png beside of my WPF exe file in the images folder. Now, I'm gonna load it into the WPF Project as an image.
I've used the following XAML code:

<Image Stretch="Fill" Source="pack://siteoforigin:,,,/images/lock.png" />

It works, but Expression Blend or Visual Studio doesn't show it when I'm working on the project.
How can we show external images in these situations?

Loading an external image to WPF App ?

Mohammad Dayyan18-Apr-10 0:32

Mohammad Dayyan

18-Apr-10 0:32

Hi,
I have an image lock.png beside of my WPF exe in the images folder.
Now, I'm gonna load it into the WPF Project as the App's icon, I've use the following XAML code, but it doesn't work :

Icon="images\lock.png"

How should I load an external image into a WPF application?
Thanks

Re: Loading an external image to WPF App ?

Roman Lerman21-Apr-10 19:43

Roman Lerman

21-Apr-10 19:43

Window.Icon Property
http://msdn.microsoft.com/en-us/library/system.windows.window.icon.aspx[^]

Imaging Overview
http://msdn.microsoft.com/en-us/library/ms748873.aspx[^]

Just read this articles, i hope this information will be helpful.

Message Removed

15-Apr-10 23:39

Lana_

15-Apr-10 23:39

Message Removed

Re: How to make the arrows keys act as another keys?

Abhinav S16-Apr-10 1:34

Abhinav S

16-Apr-10 1:34

REPOST - this question has also been put in the Q&A section.

TreeView Data binding

Joe Rozario15-Apr-10 20:45

Joe Rozario

15-Apr-10 20:45

Dear friends,

i am new to wpf and i got some doubt ,

i have class like these

public class FileSystem
     {
         Drive[] m_Drive;
         public Drive[] Drives
         {
             get { return m_Drive; }
         }
     }
     public class Drive
     {
         public string DriveName { get; set; }

         Directory[] m_Directory;
         public Directory[] Directories
         {
             get { return m_Directory; }
         }
     }
     public class Directory
     {
         public string DirectoryName { get; set; }

         File[] m_Files;
         public File[] Files
         {
             get { return m_Files; }
         }
     }
     public class File
     {
         public string FileName { get; set; }
     }

now i want to represent these in treeview control, how to do that?

can some one give me the XAML with (binding and explanation)

Thank you

Joe

Re: TreeView Data binding

Pete O'Hanlon15-Apr-10 22:01

Pete O'Hanlon

15-Apr-10 22:01

Have a read (and play about) with the code that Josh Smith put together here[^].

"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

Re: TreeView Data binding

Joe Rozario15-Apr-10 22:26

Joe Rozario

15-Apr-10 22:26

Thank for the reply,

i saw that sample , It was in MVVM patten .. i do not want anyting like that ... if i want to bind in simple way how to do that?

Re: TreeView Data binding

Pete O'Hanlon16-Apr-10 2:46

Pete O'Hanlon

16-Apr-10 2:46

That is the simple way. Don't try and complicate things for yourself.

"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

Re: TreeView Data binding

silverlightnewbee4-Jan-11 18:34

silverlightnewbee

4-Jan-11 18:34

Dear Josh,

I went thru your article and many more articles for bindinf a tree view with database. My problem is still unresolved.
my requirement is, I have three tables linked togather as below

1-Order table contains, partyCode and orderNo.
2-Item table contains, orderNo & ItemCode.
3-Stages table contains, orderNo, itemCode & stageCode.(Same stageCode can appear in the table for different items, but not for same Items. Items may or may not have stages. If Item has stages, then entry for such Item will be available in stage table. Otherwise not.)

I am unable to generate a tree in below manner:

Tree display
ord1
...Item1
.......stage1
.......stage2
...item2
.......stage1
.......stage2
.......stage3
...item3
...item4
...item5
...item6
...item7
...item8
...item9
ord2
……
ord3
…….

please help me in generating a tree of such type. I am using dataservices to getch the data from database.

Re: TreeView Data binding

Leung Yat Chun26-Apr-10 10:19

Leung Yat Chun

26-Apr-10 10:19

So you want a simple way, try this one :
http://karlshifflett.wordpress.com/2007/11/10/over-reaction-to-a-simple-wpf-explorer-tree/[^]

I am sure it will end up even more complex though. Laugh | :laugh:

QuickZip

UriMapper (and stuff) [SOLVED (sorta)]

#realJSOP15-Apr-10 6:23

#realJSOP

15-Apr-10 6:23

I have the following xaml (nonessential markup removed in the interest of brevity):

<navigation:Frame x:Name="ContentFrame" >
    <navigation:Frame.UriMapper>
        <uriMapper:UriMapper>
            <uriMapper:UriMapping Uri="/{pageName}" 
                                  MappedUri="/Views/{pageName}.xaml"/>
            <uriMapper:UriMapping Uri="/FMChart/{metricID}/{orgID}" 
                                  MappedUri="/Views/FMChart.xaml?metricID={metricID}&orgID={orgID}"/>
        </navigation:Frame.UriMapper>
    </navigation:Frame.UriMapper>
</navigation:Frame>

I'm creating the HyperLinkButton objects dynamically (in code), like so:

int metricID = 1;
int orgID = 1;

HyperlinkButton button = new HyperlinkButton();
button.Name        = Guid.NewGuid().ToString();
button.TargetName  = "ContentFrame";
<br />

<big>string url = string.Format("/FMChart/{0}/{1}", metricID, orgID);</big> // <<------

button.NavigateUri = new Uri(url, UriKind.Relative);

When I click the bbutton, the browser renders a blank page, and eventually presents me with a REALLY long stack trace (InvalidOperation exception). If I take the parameters out of th indicated line:

string url = "/FMChart";

...it works as expected (brings up the desired page).

What am I doing wrong?

SOLUTION ===========================================

It seems that the order of the UriMappers in the XAML matters. Originally the mapping I specified was the last one listed in the group. When I changed it to be the FIRST item in the group, it worked. The reason I say this is"sorta" solved is that I think this is a bug in Silverlight. It was a unique mapping (compared to all of the others) and should have been discovered by Silverlight in the original order.

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

modified on Friday, April 16, 2010 2:22 PM

Re: UriMapper (and stuff)

Abhinav S16-Apr-10 1:50

Abhinav S

16-Apr-10 1:50

John Simmons / outlaw programmer wrote:
<urimapper:urimapping uri="/FMChart/{metricID}/{orgID}" mappeduri="/Views/FMChart.xaml?metricID={metricID}&orgID={orgID}">

Not absolutely certain, but should the Uri not be Uri="/FMChart/{metricID}&{orgID} ?

Re: UriMapper (and stuff)

#realJSOP16-Apr-10 6:10

#realJSOP

16-Apr-10 6:10

I tried that too, and that didn't work either. BTW, the format of the string has been represented both ways (and on the official MS site, it's the way I have it). I've trie it the following ways:

uri = "/FMChart/{metricID}/{orgID}"
// the space between the & and the amp; in the next line is due to CodProject's 
// now completely screwed up auto-formatter
uri = "/FMChart/{metricID}& amp;{orgID}" 
uri = "/FMChart/{metricID}&{orgID}"

Re: UriMapper (and stuff) [SOLVED (sorta)]

Abhinav S16-Apr-10 20:19

Abhinav S

16-Apr-10 20:19

John Simmons / outlaw programmer wrote:
It seems that the order of the UriMappers in the XAML matters. Originally the mapping I specified was the last one listed in the group. When I changed it to be the FIRST item in the group, it worked. The reason I say this is"sorta" solved is that I think this is a bug in Silverlight. It was a unique mapping (compared to all of the others) and should have been discovered by Silverlight in the original order.

This is interesting.
Let me see if I get some time to play around with the navigational framework.

modified on Saturday, April 17, 2010 2:27 AM

Encrypting app.config through code [modified]

dashingsidds15-Apr-10 0:21

dashingsidds

15-Apr-10 0:21

Hi,

I am trying to encrypt my appSettings section through code but i am facing some problem.

This is what is am doing
-- app.config

<? xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="Encrypt" value="Encrpyted"/>
  </appSettings>
</configuration>

--Code

string s = System.IO.Directory.GetCurrentDirectory();

s = s + "\\Test_Encrypt_1_WPF.exe.config"; // "Test_Encrypt_1_WPF" is my exe name

Configuration config = ConfigurationManager.OpenExeConfiguration(s);

AppSettingsSection section = (AppSettingsSection)config.GetSection("AppSettings");

if (!section.SectionInformation.IsProtected)
{
     section.SectionInformation.ProtectSection("RsaProtectedConfigurationProvider");
}
config.Save(ConfigurationSaveMode.Modified);

In the above code the "section" object is showing null i.e. i am not able to find the "AppSettings" section.
I even tried configuration/appSettings but the same result.
Can anyone please help!

Thanks in advance,

Samar

modified on Thursday, April 15, 2010 6:57 AM

Re: Encrypting app.config through code

dashingsidds15-Apr-10 0:57

dashingsidds

15-Apr-10 0:57

Hi All,

I got the solution myself.

Instead of

string s = System.IO.Directory.GetCurrentDirectory();
s = s + "\\Test_Encrypt_1_WPF.exe.config"; // "Test_Encrypt_1_WPF" is my exe name
Configuration config = ConfigurationManager.OpenExeConfiguration(s);

i wrote

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

This worked!!

Regards,

Samar

Re: Encrypting app.config through code

Not Active15-Apr-10 2:08

Not Active

15-Apr-10 2:08

There is already a way to do this, http://msdn.microsoft.com/en-us/library/system.configuration.sectioninformation.protectsection.aspx[^]

I know the language. I've read a book. - _Madmatt

Re: Encrypting app.config through code

dashingsidds15-Apr-10 2:59

dashingsidds

15-Apr-10 2:59

Hi Mark,

I was not able to find the link you have mentioned when i was searching.

The solution in the link looks pretty similar to what i have tried.

Please do let me know if i am incorrect in any way on stating the above.

Regards,

Samar

Re: Encrypting app.config through code

Not Active15-Apr-10 3:31

Not Active

15-Apr-10 3:31

It is the same, but at least you have an example that should work.

I know the language. I've read a book. - _Madmatt

Re: Encrypting app.config through code

dashingsidds15-Apr-10 18:40

dashingsidds

15-Apr-10 18:40

Yes you are right. Thanks.

Regards,

Samar

WPF Toolkit Datagrid Performance issue in rendering

Ankush12314-Apr-10 20:47

Ankush123

14-Apr-10 20:47

Hi All,

I am facing a performance issue with WPF Toolkit datagrid. In my application I have created a view containing multiple Data Grids (around 15) with about 100 rows in each grid. The view shows 15 rows for each grid. The grids are placed in an ListView, so when I scroll in the list view I am experiencing a performance hit.

Can anyone guide me to resolve the issue.

Thanks

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