How to Convert Byte Array to BitmapSource in C# for Silverlight - WPF Discussion Boards

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

Pete O'Hanlon30-May-11 23:05

30-May-11 23:05

_Maxxx_ wrote:
I don't understand why you say this?

Lets say I will have a page
showing a list of customers, and also the individual fields from the currently
selected customer.

In MVVM I would create a VM for the page, and
also (because the functionality is self-contained) a VM for the list of
customers and a VM for the individual Customer fields (that is, ONE VM with
properties for each Customer field)

Now, my Page VM is nonsense
without having a CustomerListVM and a CustomerEditVM somehow contained within
it.

It certainly doesn't know about the VIEWs but it MUST know
about the ViewModels

Similarly neither the customerListVM nor the
CustomerEditVM can know about the PageVM - they need to exist
independently.

so surely my PageVM legitimately can say "I want to
display this list of customers" - and give the list to the CustomerListVM?

If you check out the problem that the user describes, it's not the same issue that you are describing here. What you describe is a perfectly acceptable solution where you have one view containing data derived from several VMs, where the containing VM is still being displayed.

What the OP described however was a different scenario. He has moved the implementation out of a single view into multiple views, and there is no real physical interaction between these views other than the fact that they were all originally part of one larger VM. The key point here is that the view/viewmodel interaction here is no longer with the "parent" VM, it's with the child VM. This means that, conceptually, the new VM can exist without knowledge of the old VM. The Model part, which has been entirely forgotten about in this situation, can be the same model (and is the one I would choose). So, rather than having to contort the code to worry about maintaining this disconnected list of VMs, it makes more sense to just have the child VM use the same model. Remember that a lot of people mistake the model for always being the data layer; it doesn't have to be, so a simple containing model makes this scenario a whole lot easier.

Forgive your enemies - it messes with their heads

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

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

_Maxxx_31-May-11 13:16

_Maxxx_

31-May-11 13:16

Thanks Pete - I was interpreting the OP differently - on re-reading after your post, I follow your logic.

cheers

MVVM# - See how I did MVVM my way
___________________________________________
Man, you're a god. - walterhevedeich 26/05/2011

.\\axxx
(That's an 'M')

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

Pete O'Hanlon31-May-11 21:37

Pete O'Hanlon

31-May-11 21:37

No problems mate. It took me two readings to get what he wanted right in my head.

Forgive your enemies - it messes with their heads

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

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

Mycroft Holmes31-May-11 13:14

Mycroft Holmes

31-May-11 13:14

At this point I introduce my bastardisation and have 1 CustomerVM that would service all 3 of your views.

Never underestimate the power of human stupidity
RAH

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

_Maxxx_31-May-11 13:27

_Maxxx_

31-May-11 13:27

Mycroft Holmes wrote:
1 CustomerVM that would service all 3 of your views.

that's fine - but what if you want to use the customer lookup view elsewhere - not for editing a customer but for selecting a customer for some other function (say during order entry) You don't want to use that VM with all its overhead do you? soyou would end up with aniother ViewModel supporting the Customer lookup View...

I appreciate you call it a bastardisation - but what you're really doing is treating the containing user control as a View, with a ViewModel, and the other two as user Controls (not views) so they don't have a view model any more than a text box or combo box would. And that's fine - I just find it very confusing if you call something a View that is really just a control - and if it's not just a control, i.e. if it is a View, then it should be modelled by a ViewModel -and a ViewModel's job is to model a view (otherwise they'd be called ViewsModels) Smile | :)

MVVM# - See how I did MVVM my way
___________________________________________
Man, you're a god. - walterhevedeich 26/05/2011

.\\axxx
(That's an 'M')

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

Mycroft Holmes31-May-11 14:30

Mycroft Holmes

31-May-11 14:30

Oh I'm flexible, for simple list/add dialog/detail I often have 2 views and a dialog using the same VM. If a view is particularly complex then it gets it's own VM even if that is duplicating info already in an existing VM. And no I have no intention of renaming them VsM Laugh | :laugh:

_Maxxx_ wrote:
I just find it very confusing if you call something a View that is really just a control

The list view is the entry point into the structure, the detail view is distinct, navigated to via a double click from the datagrid on the list view, the add dialog is obviously a childwindow from the list view. All 3 use the same VM, calling the detail view a control is not correct, the dialog maybe.

Never underestimate the power of human stupidity
RAH

Re: How to pass a new instance of a viewmodel to an existing usercontrol?

_Maxxx_31-May-11 15:59

_Maxxx_

31-May-11 15:59

Mycroft Holmes wrote:
All 3 use the same VM, calling the detail view a control is not correct, the dialog maybe.

I see exactly what you're talking about - and it's really down to terminology - but in my view (pub intended) the VM models a V, and if there isn't a specific Vm then it's not a V, it's just a control - as it cannot be used (or tested) stand-alone.

It was partly because of this that I introduced the concept of ViewData separate from (but used by) the ViewModel

MVVM# - See how I did MVVM my way
___________________________________________
Man, you're a god. - walterhevedeich 26/05/2011

.\\axxx
(That's an 'M')

How to Convert Byte Array to BitmapSource in C# for Silverlight

Vimalsoft(Pty) Ltd26-May-11 0:18

Vimalsoft(Pty) Ltd

26-May-11 0:18

Good Day All

I have a Generic function that in my Static Class. i have this Class in Silverlight

public static BitmapSource LoadImage(Byte[] imageBytes)
    {
        BitmapImage bmpImage = new BitmapImage();
        MemoryStream mystream = new MemoryStream(imageBytes);
        bmpImage.SetSource(mystream);
        return bmpImage;
    }

Now this looked fine for me until i had to bind an Image in Silverlight like this

PhotoHolder.Source =GenericMethods.LoadImage(model.imbPhoto);

The Images i have in the Database are Supported by silverlight they are jpg type.

and the Elelment that i am binding to look like this in Silverlight

<Image x:Name="PhotoHolder" Height="98" Width="102" OpacityMask="Black"  Canvas.Left="141" Canvas.Top="30">
            <Image.Effect>
                <DropShadowEffect/>
            </Image.Effect>
        </Image>

so if i bind i get this Error

Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: How to Convert Byte Array to BitmapSource in C# for Silverlight

Mark Salsbery26-May-11 11:10

Mark Salsbery

26-May-11 11:10

Where does the exception occur??

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to Convert Byte Array to BitmapSource in C# for Silverlight

Vimalsoft(Pty) Ltd26-May-11 11:13

Vimalsoft(Pty) Ltd

26-May-11 11:13

hi

it happen on this line

bmpImage.SetSource(mystream);

i have used the Correct Image Format that are supported in Silverlight.

Re: How to Convert Byte Array to BitmapSource in C# for Silverlight

Mark Salsbery26-May-11 11:39

Mark Salsbery

26-May-11 11:39

It should work with valid JPEG bytes...

I tested your LoadImage() method but with JPEG bytes loaded from disk and it works fine:

private void loadButton_Click(object sender, RoutedEventArgs e)
{
    OpenFileDialog ofdlg = new OpenFileDialog();
    ofdlg.Filter = "Image Files (*.jpg, *.jpeg, *.png)|*.jpg;*.jpeg;*.png";
    if (true == ofdlg.ShowDialog())
    {
        long filelength = ofdlg.File.Length;
        Byte[] imageBytes = new byte[filelength];
        using (FileStream fs = ofdlg.File.OpenRead())
        {
            fs.Read(imageBytes, 0, (int)filelength);
        }
        PhotoHolder.Source = GenericMethods.LoadImage(imageBytes);
    }
}

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to Convert Byte Array to BitmapSource in C# for Silverlight

Vimalsoft(Pty) Ltd26-May-11 19:04

Vimalsoft(Pty) Ltd

26-May-11 19:04

Now i have a Different Error in the same place

Error HRESULT E_FAIL has been returned from a call to a COM component.

THANKS

Re: How to Convert Byte Array to BitmapSource in C# for Silverlight

Mark Salsbery26-May-11 19:09

Mark Salsbery

26-May-11 19:09

Silverlight COM component? hmm I have no idea. It works fine for me with valid JPEG files (and PNG files).

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How to retrieve hyperlink url from selection text in wpf?

John-ph25-May-11 23:06

John-ph

25-May-11 23:06

trying to copy and paste text containing hyperlink from one richtextbox to another with TextPointer position as parameter.
tried using the following code but couldn't figure out what the problem is. it did not work.

private Hyperlink GetHyperlinkAncestor(TextPointer position)
{
Inline parent = position.Parent as Inline;
while (parent != null && !(parent is Hyperlink))
{
parent = parent.Parent as Inline;
}
return parent as Hyperlink;
}

- Regards -
J O N

A good thing is a bad thing if it keeps you from the best thing. - Dr. Adrian Rogers

Installer for WPF Control

Prasoon Chaudhary25-May-11 21:22

Prasoon Chaudhary

25-May-11 21:22

I have created a WPF control, which I want to deploy to the user.

I need to create an installer for this control. Installer should create a custom tab in VS toolbox and place the control inside that tab, the way it is done by other WPF control installers (e.g., Telerik).

Any help/idea?

Re: Installer for WPF Control

Wayne Gaylard25-May-11 21:32

Wayne Gaylard

25-May-11 21:32

This was the first link Google came up with How to: Package and Install Custom Controls for the Toolbox[^]. That should tell you all you need to know. Next time try Google it yourself.

...and I have extensive experience writing computer code, including OIC, BTW, BRB, IMHO, LMAO, ROFL, TTYL.....

Re: Installer for WPF Control

Prasoon Chaudhary25-May-11 22:09

Prasoon Chaudhary

25-May-11 22:09

Many thanks for your reply. I tried google before asking question here, but none of them (including this one) could fulfill my requirement.

When I install Telerik with the help of their EXE, it just installs everything without being specific to any application. It puts that control into a specific tab in VS toolbox and also places it into 'Assets' tab of 'Expression Blend' without asking any question.

This .vsi file, including dialog box and messages, seems to be specific to Visual Studio and asks questions before installing.

Re: Installer for WPF Control

Abhinav S26-May-11 7:55

Abhinav S

26-May-11 7:55

This [^]could help you as well.

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.

How to Access a Cookie Created in Silverlight from an Asp.net page

Vimalsoft(Pty) Ltd25-May-11 5:29

Vimalsoft(Pty) Ltd

25-May-11 5:29

Good Day All

I have another question. I have a Silverlight application and in one of the Silverlight pages i am hosting an Asp.net Page using a RadhtmlContainer(Telerik). I created a Cookie in Silverlight like this

public static void SetCookie(string key, string value)
{

   // string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
    DateTime expiration = DateTime.UtcNow + TimeSpan.FromDays(2000);
    string cookie = String.Format("{0}={1};expires={2}", key, value, expiration.ToString("R"));
    HtmlPage.Document.SetProperty("cookie", cookie);
}

and i have the same generic function to access it like this

public static string GetCookie(string key)
     {
         string[] cookies = HtmlPage.Document.Cookies.Split(';');
         key += '=';
         foreach (string cookie in cookies)
         {
             string cookieStr = cookie.Trim();
             if (cookieStr.StartsWith(key, StringComparison.OrdinalIgnoreCase))
             {
                 string[] vals = cookieStr.Split('=');

                 if (vals.Length >= 2)
                 {
                     return vals[1];
                 }

                 return string.Empty;
             }
         }

         return null;
     }

so i am trying to access this cookie in an asp.net page that is hosted on the the html Container , but i dont find the cookie.

Basically what i want to Achieve is

i want to access a value that is being created in Silverlight e.g "userid" "Username" normally i store it in the Cookie , so now i want to do a database insert , i need to do that insert from that asp.net page, but i cant get hold of that cookie value.

Thanks

Re: How to Access a Cookie Created in Silverlight from an Asp.net page

Pete O'Hanlon25-May-11 6:25

Pete O'Hanlon

25-May-11 6:25

What do you see in HtmlPage.Document.Cookies when you enter the GetCookies method? It would really help if you set a breakpoint there and told us what was in that part? Plus, and I know this seems obvious, but make sure that the SetCookie method is called before you call GetCookies.

Forgive your enemies - it messes with their heads

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

Re: How to Access a Cookie Created in Silverlight from an Asp.net page

Vimalsoft(Pty) Ltd25-May-11 7:18

Vimalsoft(Pty) Ltd

25-May-11 7:18

Good Evening Pete

Thank you for your kind response.

The First thing i do is to set the Cookie when the User has Just Logged in and after that that the User will be redirect to a Welcome page. There are Menu's that are visible for the User to select , and one of them will lead to a Silverlight page that will require the Cookie value that has been set at Login.

So the above explanation your last point that i should first set the Cookie and Access it later

To answer the first question about the htmlpage.Document.Cookies , it has an empty string i am not sure why.

Thanks

Re: How to Access a Cookie Created in Silverlight from an Asp.net page

Pete O'Hanlon25-May-11 9:06

Pete O'Hanlon

25-May-11 9:06

From your description, the cookies are added by the website and not by Silverlight. It looks like you are trying to read the cookies created in the ASP.NET side, in your Silverlight code. According to MSDN[^], Cookies are disabled by default for security reasons. Use WebClient instead.

Forgive your enemies - it messes with their heads

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

Re: How to Access a Cookie Created in Silverlight from an Asp.net page

Mycroft Holmes25-May-11 12:03

Mycroft Holmes

25-May-11 12:03

Can you pass the cookie value into the silverlight app as an initial parameter?

Never underestimate the power of human stupidity
RAH

Re: How to Access a Cookie Created in Silverlight from an Asp.net page

Vimalsoft(Pty) Ltd6-Jun-11 4:55

Vimalsoft(Pty) Ltd

6-Jun-11 4:55

the thing is i want the value out of Silverlight to aspx

Silverlight and subdomains

Mycroft Holmes24-May-11 22:44

Mycroft Holmes

24-May-11 22:44

I have a SL site that is structured like

Corporate
- Company1
- Company2
- Company3
- Company4

Entry to the site is www.corporate.com

Each company now wants to basically skin their area of the site with thier company identity and to access their area directly skipping the corportate.com page. I know I can change skins (never having built a skin this is an assumption) so what is the recommended method of going directly to the company pages based on the URL.

All will use the same xbap, wcf and database it is just the entry point for the companies.

Never underestimate the power of human stupidity
RAH

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