Re: How to get images in Application's folder - WPF Discussion Boards

I have a silverlight application which uses wcf service hosted in a wpf application, but when I try to connect more
then one client the second client always waits until the first client
completes the call.How can I make
WCF to accept calls from multiple clients at the same time?

I would start by setting the service ConcurrencyMode to Multiple

[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple]
public class MyService : IMyService
{
    ...

If you have operations that take time and/or block (like pretty much any device
I/O operation does), which apparently you do, you should implement the service
operation(s) asynchronously:

Synchronous and Asynchronous Operations[^]

Mark

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

Thanks for the answer,But I already used [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple],but the problem still exists,Also implemented the service as asynchronously,Could you suggest any other solutions?

I have no idea what's wrong.

It could be in host configuration, service configuration, or the service implementation.

I can't reproduce this, even without the [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)].

Even a synchronously implemented operation like

public string EchoStringSynchronous(string msg)
{
    Thread.Sleep(10000);

    return msg;
}

can be executed by multiple clients without a client having to wait for
another client's operation to complete.

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

Hi,

I am working on WPF application. In this I have to save images into a folder named Slides which is in the application and I have to retrieve these images. But I am getting error with the path. I am able to access folder in some other drive but I am getting error when I directly access the folder.

string CanvasFile = "d:\\canvas" + Canvasnum + ".png";
util.SaveCanvas(this, this.canvasDesigner, 136, CanvasFile);

Image img = new Image();
img.Source = new BitmapImage(new System.Uri(@"D:\canvas.png"));
panel.Children.Add(img);

If anyone have idea to access the folder in the application directly lease reply me.

Thanks in advance.

Do you want to retrive the images from disk at runtime or use images that are part of the assembly?

Cheers, Karl

» CodeProject 2008 MVP, CodeProject 2009 MVP

My Blog | Mole's Home Page |
XAML Power Toys Home Page

Just a grain of sand on the worlds beaches.

modified 27-Feb-21 21:01pm.

Nekkantidivya wrote:
I am working on WPF application. In this I have to save images into a folder named Slides which is in the application and I have to retrieve these images. But I am getting error with the path.

What is the error ?

It's not clear as to exactly what is the issue. Can you rephrase the question ?

Try this i am sure this will help u.
1.In Visual Studio, click the Project menu, and select Add Existing Item. Find and select the image you want to add to your project.
2.In the Solution Explorer window, right-click the image file you just added to your project, and select Properties from the popup menu. The Properties tool window appears.
3.In the Properties window (see picture below), change the Build Action property to Embedded Resource.
4.Build the project. The image will be compiled into your project's assembly.

Load Image Resource
Be sure to include the following namespaces in your project:

using System.IO;
using System.Reflection;
To load the image resource programmatically, use the following code:

Assembly myAssembly = Assembly.GetExecutingAssembly();
Stream myStream = myAssembly.GetManifestResourceStream( "MyNamespace.SubFolder.MyImage.bmp" );
Bitmap bmp = new Bitmap( myStream );

The trickiest part of loading an embedded resource is getting the correct path. A resource path takes this form:

<namespace>.<subfolders>.<image name>.<extension>

where:

namespace is the namespace for the project
subfolders is the folder path within the project, with each folder separated by a period instead of a slash
image name is the name of the image file
extension is the image file extension (for example, "bmp" or "jpg")

Hello,

What i am doing is, i am creating a Datatable based on values that user fills up in the form.
Further i am assigning that datatable to the WPF datagrid to display the Grid.
dgMatrix.ItemsSource = GetDataSource.DefaultView

Now, as the user edits the grid and presses the SAVE button under the grid, I would like to save all the rows of the Grid into a new table in the database.

Is there a way to loop through each row of the Grid and then inserting each record into the database??
In ASP.net i was using the following function:

'For Each row As GridViewRow In dgMatrix.Rows

'
' Dim checkbox As CheckBox = CType(row.FindControl("cbRows"), CheckBox)

' If checkbox.Checked Then

' Try

' Dim txtFromPorts As TextBox = CType(row.FindControl("txtPortsFrom"), TextBox)
' Dim txtToPorts As TextBox = CType(row.FindControl("txtPortsTo"), TextBox)
' Dim txtFType As TextBox = CType(row.FindControl("txtFareType"), TextBox)
' Dim txtFClass As TextBox = CType(row.FindControl("txtFareClass"), TextBox)
' Dim txtLowGAmt As TextBox = CType(row.FindControl("txtGrossAmtLow"), TextBox)
' Dim txtLowNAmt As TextBox = CType(row.FindControl("txtNettAmtLow"), TextBox)
' Dim txtHighGAmt As TextBox = CType(row.FindControl("txtGrossAmtHigh"), TextBox)
' Dim txtHighNAmt As TextBox = CType(row.FindControl("txtNettAmtHigh"), TextBox)
' Dim txtPeakGAmt As TextBox = CType(row.FindControl("txtGrossAmtPeak"), TextBox)
' Dim txtPeakNAmt As TextBox = CType(row.FindControl("txtNettAmtPeak"), TextBox)

' ' Dim dr As DataRow = dtNew.NewRow

' strFrom = txtFromPorts.Text
' strTo = txtToPorts.Text
' strFareType = txtFType.Text
' If txtFClass.Text.Trim <> "" Then
' strFareClass = txtFClass.Text
' End If

' If txtLowGAmt.Text <> "" Then
' strGrossLow = txtLowGAmt.Text
' End If
' If txtLowNAmt.Text <> "" Then
' strNettLow = txtLowNAmt.Text
' End If
' If txtHighGAmt.Text <> "" Then
' strGrossHigh = txtHighGAmt.Text

' End If

' If txtHighNAmt.Text <> "" Then
' strNettHigh = txtHighNAmt.Text
' End If

' If txtPeakGAmt.Text <> "" Then
' strGrossPeak = txtPeakGAmt.Text
' End If

' If txtPeakNAmt.Text <> "" Then
' strNettPeak = txtPeakNAmt.Text
' End If

' 'Check if the checkbox is checked.

' strSQL = "INSERT INTO FareInfo (" + _
' "FareId," + _
' "PortsFrom," + _
' "PortsTo," + _
' "FareType," + _
' "FareClass," + _
' "GrossAmtLow," + _
' "NettAmtLow," + _
' "GrossAmtHigh," + _
' "NettAmtHigh," + _
' "GrossAmtPeak," + _
' "NettAmtPeak" + _
' ") VALUES ("

' If (strFareId <> "") Then
' strSQL = strSQL + "'" + strFareId + "',"
' strSQL = strSQL + "'" + strFrom + "',"
' strSQL = strSQL + "'" + strTo + "',"
' strSQL = strSQL + "'" + strFareType + "',"
' strSQL = strSQL + "'" + strFareClass + "',"
' If strGrossLow <> "" Then
' strSQL = strSQL + " " & strGrossLow & " ,"
' Else
' strSQL = strSQL + " " & "null" & " ,"
' End If

' If strNettLow <> "" Then
' strSQL = strSQL + "" + strNettLow + ","
' Else
' strSQL = strSQL + " " & "null" & " ,"
' End If

' If strGrossHigh <> "" Then
' strSQL = strSQL + "" + strGrossHigh + ","
' Else
' strSQL = strSQL + " " & "null" & " ,"
' End If

' If strNettHigh <> "" Then
' strSQL = strSQL + "" + strNettHigh + ","
' Else
' strSQL = strSQL + " " & "null" & " ,"
' End If
' If strGrossPeak <> "" Then
' strSQL = strSQL + "" + strGrossPeak + ","
' Else
' strSQL = strSQL + " " & "null" & " ,"
' End If
' If strNettPeak <> "" Then
' strSQL = strSQL + "" + strNettPeak + ""
' Else
' strSQL = strSQL + " " & "null" & " "
' End If

' strSQL = strSQL + ")"

' End If
' DBClass.ExecuteQuery(strSQL)
' gvMatrix.Visible = False

' 'Insert 1 row in Progress grid

' Catch ex As Exception

' End Try

' End If

'Next

Can someone suggest me the right way to do so in WPF. I would really appreciate that, Thanks.

I believe the idea is that updates to the grid automatically update the data source, and so you should iterate over that.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

Thanks for reply Christian.This is what i have done,

dvMatrix = GetDataSource.DefaultView

dgMatrix.ItemsSource = dvMatrix

Datasource1 = GetDataSource()

So, I am assigning itemsource using GetDataSource method which returns me a datatable. I will store it in a public datatable variable(DataSource1).

So inside the btnSave_click event,
Dim dt As DataTable
Dim dr1 As DataRow

dt = Datasource1 'i am using the datatable- DataSource1

Dim jk = dt.Rows.Count

For Each dr1 In dt.Rows

strFrom = dr1("PortsFrom")
strTo = dr1("PortsTo")
....
next

Problem is, i am still getting original grid content not the modified content.
Is there something i need to do inside dgMatrix_RowEditEnding function to update the datasource??

Your datasource needs to be an observablecollection for this to work. Perhaps it's not.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

Excellent,with observablecollection its working. Thanks a ton for guiding me!!! Big Grin | :-D

Just because i thought it will help me in future. If we fetch data from some table in database, into a observable collection.
And then display that data in the grid.
When the user edits the grid, changes are reflected in observable collection, is there a quick way to commit those changes in the database as well??

I don't really know, to be honest. I've not done any database work with WPF yet, that is nothing to a SQL database, all to my own file formats. I would imagine you'd want to make an observablecollection of a class type, and write code in there to update the DB if data is changed, or new data added, but that could be old school thought, there may be something better built in.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

I have the same feeling,there must be a better way of doing it. Thanks for your help though!

Any time you add an item into an observable collection, or remove an item, the collection raises a CollectionChanged event. You can use this to identify records that have been added or deleted. If you are updating a record though, the collection won't help you because it doesn't monitor changes to items in the collection; it only monitors changes to the collection itself.

What you need to do, in this case, is have your model expose INotifyPropertyChanged, and then (whenever a property is changed), raise a change notification on the item itself. This[^] article gives a bit more detail about notifications.

"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

See - I knew there was a smarter answer....

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

Hi
I have a startup form in my app. When this form loads the main form in the background is blurred out using a BitmapEffect and a timer. The timer is used to increment the blur radius in every timer tick, and then un-blur the screen again using another timer.
What I want to know is, is there a better way of gradually blurring the form in the background without using a timer each time?

Below is a sample of the code I'm using.

void blurTimer_Tick(object sender, EventArgs e)
        {
            if (blurTimerCount != 10)
            {
                BlurBitmapEffect blurEffect = new BlurBitmapEffect();
                
                blurEffect.Radius = blurTimerCount;
                blurEffect.KernelType = KernelType.Box;

                mainWindow.BitmapEffect = blurEffect;

                blurTimerCount++;
            }
            if (blurTimerCount == 10)
            {
                blurTimer.Stop();
            }
        }

Setup a storyboard somehow, and "animate" it?

I was thinking about trying that myself.

"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." - Jason Jystad, 10/26/2001

Etienne_123 wrote:
blurEffect.Radius = blurTimerCount;

This looks like the property you could just animate in a timeline in XAML, to me.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

This is actually quite trivial. Here's a sample:

<Window 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Window.BitmapEffect>
    <BlurBitmapEffect x:Name="blurTarget" KernelType="Gaussian" Radius="0"/>
  </Window.BitmapEffect>
  <Window.Triggers>
    <EventTrigger RoutedEvent="Window.Loaded">
      <BeginStoryboard>
        <Storyboard>
          <DoubleAnimation
            Duration="0: 0:10"
            From="0.0"
            Storyboard.TargetName="blurTarget"
            Storyboard.TargetProperty="Radius"
            To="40.0"/>
        </Storyboard>
      </BeginStoryboard>
    </EventTrigger>
  </Window.Triggers>
  <Grid>
    <Button Content="This Is my button" />
  </Grid>
</Window>

"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

Thanks guys, I got it working.

I just declared 2 new storyboards in my xaml (one for blurring and another for unblurring), then I just used the following in the code behind to start the storyboards:

Storyboard storyBlur = this.FindResource("blurMainWindow") as Storyboard;
storyBlur.Begin();

I tried this:

<BlurEffect x:Name="blurTarget" Radius="12" KernelType="Gaussian" />
<Storyboard x:Key="AnimateUnblur">
    <DoubleAnimation From="12" To="0" Duration="0:0:1"
                        Storyboard.TargetName="blurTarget"
                        Storyboard.TargetProperty="Radius" />
</Storyboard>

and then tried this:

BlurEffect blur = (BlurEffect)FindResource("blurTarget");
this.Effect     = blur;

And it's throwing an exception because it can't find the resource "blurTarget".

"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." - Jason Jystad, 10/26/2001

I'm using page navigation, with pack URI's specified like this:

Uri uri = new Uri(@"/DetailAssembly;component/Detail.xaml",UriKind.Relative);
frame.Navigate(uri);

In the LoadCompleted handler, I see the following:

public void _DetailLoadCompleted(Object sender,NavigationEventArgs e)
{
  // e.Uri.ToString() == e.Uri.OriginalString() ==
  // "DetailAssembly;component/Detail.xaml"
}

Somewhere along the line, someone removed the leading '/' character from the relative URI.

I know this is a picayune little detail, but does anyone know why they would do this? I thought maybe there was something I'm not understanding about URI's in WPF, but I can't find anything on MSDN or in my books. My basic conclusion is that it's just a bug. Can anyone offer any other explanation?

Software Zen: delete this;