Improved Resource file project template in vs2008

Visual Studio 2008 resource file project template is now more improved! and more usable.It has very user friendly and easy to edit environment, providing the user with the ease of managing resource better than ever. I have been using resource file since Visual Studio 2003. Previously I got to write code and use resource manager to pull the resources from the embedded resource file. And there are maintenance hassles to load a resource only once. We did lot of engineering previously to resolve the easy management and developer friendly architecture for resource accessibility. Now resource management with Visual Studio 2008 resource file template is a child's job.

 

What can be added in resource file

 

Now we can add different type of resource file just with few mouse click, isn't it great. Okay, here is the list of file type you can add as a resource file in resource file template.

• String
• Image
• Icon
• Audio
• Files
• Other(Virtually every thing!)

 

 

So there is lot to work with resource file. The magic is you can add these files with drag and drop from any location. Adding resources is that much easy. Still you have some traditional way of adding resource, you can add new resource and also add existing file from the disk. for this we have to click on "Add Recourse" button in Resource Management Window.

 

 

Access Modifier

 

Resource file and its type has few access modifier just like our class access modifier. If you set access modifier as "No code generation"  no designer generated code will be generated! ... this means now we don't have to write any manager class to manage and pull the resources from embedded resource file if we choose access modifier other than "No code generation". Here are the options we have in access modifier.

• Internal
• Public
• No code generation

 

Visual Studio 2008 will automatically write a class and code for you so what you can access your files right way. This is one of the major improvement in resource file template of Visual Studio 2008. If you set access modifier as "Internal" your resource can only be accessed from the container project of the resource file, that implies what you can not access resources, that are marked as internal, from out side the project. So of course setting the access modifier to "Public" will made our resource accessible from any where.

 

I have used string file in in couple of my projects and did all custom codes to manage those. Now I use resource file right way because its so easy. Here is a view what designer generates for you.

 

 

Resource File "IntelliSense"

 

Since we have a designer generated code so we can use the class right way in our code and also enjoy the facility of intellisence. A very beautiful feature is that if we will get the object as typed object, means if we added string type it will give use string object, and if we have added image in our resource file it will return a Image Type object. so its pretty smart and we can bind it to a Image Control to display it.

 

 

Well another thing that I want to share, that, its has different type of view in resource manager window. we can switch to thumb nail mode if we are using image and easily locate which image we are looking for. Of Course we can also filter our resource using resource type selector.

NOTE: Each Resource is added against a key so. Key must be unique.

Using Background Process in WPF

WPF applications often needs to call time consuming methods or processes, the time consuming methods or processes can be, huge time consuming calculation or perhaps a web service call. In case of WPF specially XBAP (wpf browser application) which run on remote client machines browser, this sort of calls can make your user interface unresponsive.  I am working with WPF for more than four month. Lot of things come in to way and dealt with nicely. Well in this post I am going to share a simple trick for avoiding unresponsiveness of user interface. We have already used this technique in many cases in our application, but this is for WPF.

The "Thread & Invoke"

BackgroundWorker is a very smooth and useful tool for our purpose of making more responsive UI(user interface). Before discussing more about BackgroundWorker lets take a flash back of legacy technique (which is pretty smart)  implementation of making  more responsive UI. Previously I used threading for implementing such kind of UI smoothness. What I did is to create a background thread and call expansive operation on that thread. When the job is finished use the "MethodInvoker" method to let know the UI thread that the job is finished. And this model is called asynchronous model. And this is quite smart model and rest of the models are based on this approach. Here is a quick code snippet for demonstration the technique.

//first start the method with tread
System.Threading.ThreadStart ts = new System.Threading.ThreadStart(ExpansiveMethod);
System.Threading.Thread t = new System.Threading.Thread(ts);
t.Start();
protected void ExpansiveMethod()
{
//Very expansive call will go here...
//after the job is finished call method to update ui
MethodInvoker updaterMI = new MethodInvoker(UpdateChange);
this.BeginInvoke(UpdateChange);
}
protected void UpdateChange()
{
//again back to main ui thread
}

 

The "Background Worker"

Okay, its time to use the BackgroundWorker. An amazing thing about background worker is, its simple to use.  First, lets see what a background worker is. "BackgroundWorker" is a class under "System.ComponentModel" which executes an operation on a separate thread. Which is introduced from dot net framework 2.0. Things are again pretty simple just like tread, All you have to do is instantiate a BackgroundWorker and subscribe its events, and call the "RunWorkerAsync()" method. Lets put a code snippet. Since we are programmers we understand code better.

void MyMethodToCallExpansiveOperation()
{
//Call method to show wait screen
BackgroundWorker workertranaction = new BackgroundWorker();
workertranaction.DoWork += new DoWorkEventHandler(workertranaction_DoWork);
workertranaction.RunWorkerCompleted += new RunWorkerCompletedEventHandler(workertranaction_RunWorkerCompleted);
workertranaction.RunWorkerAsync();
}
void workertranaction_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//Call method to hide wait screen
}
void workertranaction_DoWork(object sender, DoWorkEventArgs e)
{
//My Expansive call will go here...
}

As you can see in above code I have subscribed two event "DoWork" (which is the main function) and "RunWorkerCompleted", In dowork event handler we will put our expansive time consuming operations, as the name imply's RunWorkerCompleted event is fired when the work is finished . BackgroundWorker also has "ProgressChanged" event which is used to let the main UI thread know how much work is completed.

The "Dispatcher"

In few cases the BackgroundWorker needs to access the main UI thread. In WPF we can use "Dispatcher" which is a class of "System.Windows.Threading" and a delegate to access the main thread. First of all we have to declare a delegate for our candidate methods, and then use the delegate to call the method using Dispatcher. Dispatcher has few thread priority and you can use various priority from DispatcherPriority enum. "Send" has the highest priority in DispatcherPriority.

//delegate for our method of type void
public delegate void Process();
//and then use the dispatcher to call the method. 
Process del = new Process(UpdateMyUI);
this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Background, del);
void UpdateMyUI()
{
//get back to main UI thread
}

For more reading about this Asynchronous Programming please visit the references.

Reference

• http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx


• http://weblogs.asp.net/justin_rogers/articles/126345.aspx


• http://www.eggheadcafe.com/articles/20050926.asp


• CodeProject

Wpf Image ,Working with Image Source

Hi after a long time I am back in my blog. In this post I will discuss few things about WPF image object. Recently I have been working in a project whose UI Layer is build entirely with windows presentation foundation.

Background

WPF has another way to display image. That is, using BitmapImage object. You can declare BitmapImage tag and in WPF XAML just like Image tag. But in case of BitmapImage the source property is a Uri name is UriSource. Luckily BitmapImage is the source property of Image. Here is a simple code segment of Image and BitmapImage.

ImageSource & BitmapImage

WPF has another way to display image. That is, using BitmapImage object. You can declare BitmapImage tag and in wpf xaml just like Image tag. But in case of BitmapImage the source property is a Uri name is UriSource. Luckily BitmapImage is the source property of Image. Here is a simple code segment of Image and BitmapImage

<Image Width="200" Margin="5" Grid.Column="1" Grid.Row="1" >
<Image.Source>
<BitmapImage UriSource="sampleImages/bananas.jpg" />
</Image.Source>
</Image>

Mouse hover effect

Bellow I have listed few lines of code when i change the image in mouse enter and mouse out of an image object. Of course I am using Uri to define the location of my image then using the Uri to make a new BitmapImage and finally use BitmapImage to assign Image.Source Property.

   1:  private void btnGoToHome_MouseEnter(object sender, MouseEventArgs e)

   2:  {

   3:      this.Cursor = Cursors.Hand;

   4:      Uri src = new Uri(@"C:/Images/DifferentTransaction_Icon_Active.png");

   5:      BitmapImage img = new BitmapImage(src);

   6:      btnGoToHome.Source = img;

   7:  }

   8:  

   9:  private void btnGoToHome_MouseLeave(object sender, MouseEventArgs e)

  10:  {

  11:      this.Cursor = Cursors.Arrow;

  12:      Uri src = new Uri(@"C:/Images/DifferentTransaction_Icon_Normal.png");

  13:      BitmapImage img = new BitmapImage(src);

  14:      btnGoToHome.Source = img;

  15:  }

That's it you are done

Reference

http://msdn.microsoft.com/en-us/library/system.windows.controls.image.aspx

No Scroll content of wpf xbap in iframe

In my previous blog post i have discussed about how to hide the navigation ui of xbap while you hosting Xbap ( Xaml browser application) in iframe. Note that xbap can be accessed directly from browsers url address and can also be viewed in a iframe in existing web site. In both case user can have contents that requires scrolling.If user developed the xbap application in such a way that the application will be accessed directly form url address, user can archive the goal by adding a "scrollableview" element in your xmal page. bellow a code sample is provided.

   1:  <Page x:Class="CookieTest.Page1"

   2:        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

   3:        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

   4:        Title="Page1">

   5:      <ScrollViewer>

   6:          <Grid>

   7:              <!--your content will go here–>-->

   8:          </Grid>

   9:      </ScrollViewer>

  10:  </Page>

Next case is if user hosted the xbap application in a iframe. In this case there is a good chance that user will be viewing two vertical scrollbar in user's browser if users existing site's page is long enough to cause view a vertical scroll bar, that is the browser's vertical scrollbar. Xbap host have a defined size, which generally as long and wide as the browser window. So if your content is longer than the size of xbap host, you can loose your content from viewable content area. or you will end up having two scrollbar.Well there is several solutions to this problem. Lets discuss with a simpler version. Make the iframe's height property as long as the xbap that is hosting the xbap. And make sure that your xbap will not grow larger than that. but if your xbap has variable content and has variable height and you got to keep the constant look you need to do some engineering to keep things smooth.Xbap do support get and set of cookie in the site of origin. so do calculate your height for your content in xbap and then set the height as a cookie, make sure you do set the height of the content as a cookie each time the content of xbap has changed, of course in case of the content that cause the xbap to change its size. here is a code example to set cookie for site from xbap.

Application.SetCookie(BrowserInteropHelper.Source, "HEIGHT=" + DemoHeight );

Now in the page, where you hosted your xbap in iframe read the cookie with javascript and the change the height of the iframe. that's it you will have a smooth operation of auto grow or shrink of your xbap and wont cause any extra scrollbar. for reading the cookie do a little engineering for example always track the height cookie with javascript timer based function.

   1:  <script language="javascript" type="text/javascript">

   2:  function getCookie(c_name)

   3:  {

   4:      if (document.cookie.length>0)

   5:      {

   6:        c_start=document.cookie.indexOf(c_name + "=");

   7:        if (c_start!=-1)

   8:          {

   9:          c_start=c_start + c_name.length+1;

  10:          c_end=document.cookie.indexOf(";",c_start);

  11:          if (c_end==-1) c_end=document.cookie.length;

  12:          return unescape(document.cookie.substring(c_start,c_end));

  13:          }

  14:      }

  15:      return "";

  16:  }

  17:  function InCreaseHeight()

  18:  {

  19:      var hight = getCookie('HEIGHT');

  20:      if(hight != "")

  21:      {

  22:          if(document.getElementById('framename')!=null)

  23:          {

  24:              if(hight<600)

  25:              {

  26:                  hight = 600;

  27:              }

  28:              document.getElementById('framename').height = hight;

  29:          }

  30:      }

  31:      setTimeout("InCreaseHeight()",250);

  32:  }

  33:  </script>

one more thing do call the javascript increase height function on body on load event of the page to kick start the process.

   1:  <body onload="InCreaseHeight();">

Reference:

http://www.w3schools.com/js/js_cookies.asp
http://msdn2.microsoft.com/en-us/library/ms750478.aspx#Cookies

CodeProject

Hide Navigation UI (back, forward button) of Xbap application

Xbap application can be used directly in browser or can be used in a iframe in a web page. when you use directly in browser, browsers nagivation ui is used as xbap navigation UI . But if you use xbap in a iframe xbap host automatically add two back forward button and add a navigation header to your xbap application. if you are using the xbap in a existing web page and in a iframe this cause a little bit problem.

but we can hide the navigation ui very easyly... all we have to do is to set the wpf page object's ShowsNavigationUI property to false... thats all... you are done. But if you are using an "user control" as startup object there is no way to set the property. This works only in case of WPF Page project item template.

But you can still hide the navigation UI... on application's contractor subscribe the navigated event ..

public App()
{
this.Navigated += new NavigatedEventHandler(App_Navigated);
}

void App_Navigated(object sender, NavigationEventArgs e)
{
NavigationWindow ws = (e.Navigator as NavigationWindow);
ws.ShowsNavigationUI = false;
}

Creating web application and web site that run in IIS 7 of windows vista from vs2008

While creating a web site in vs2005 or vs2008 , web site location has three options and the options are 1. File System 2. HTTP 3. FTP

Previous version of Visual studio (VS2002,VS2003) supports web application that run only on IIS. User can easily create web applications cause Visual Studio automatically guide the user to create a web application. Since vs2005 come with whole new application suite for example, Web Site template , web application template and mix mode of Ajax templates user had options to chose between many things. I personally used IIS and File System web site and web applications (File System web run on Vs integrated vs development web server ) in windows XP. I have recently moved to windows vista and and VS2008 Team System. I found some interesting stuff regarding windows vista and vs2008 that I thought need little share with the community (might help some one).

Web site in VS2008 on windows vista that run on IIS

I wanted to create a web site in IIS so I opened vs2008 selected ASP.net "Web Site" project template and Choose Local IIS but I found a strange message and unable to proceed to create a virtual directory from the wizard. I didn't read the message carefully, I thought my IIS is not installed properly or my IIS is not running. I opened my IIS administration MMC from administrator tool and found that IIS is up and running well, then I got confused and performed the same site creation operation again. This time when the Local Internet Information Server tab got selected I read the message carefully and it says how to create web site from vs2008, and it says I got to run vs2008 with "Run as administrator" :)

I closed my IDE and opened IDE from start menu with "Run as administrator" options selected from right click menu and performed the same operation again, this time every thing worked just okay :).

Web app in VS2008 on windows vista that run on IIS

While creating a "web application" project (which is created via choosing new project, rather than new web site from File->New menu) user do not have any option to select between File system or IIS hosted project in project creation wizard. By Default a File System based web application is created for the user. Just follow the normal procedure to create a web application, after web application creation is completed select the project properties. When the project properties window appear select the Tab named "Web*". You will see in web tab by default "Use Visual Studio Development Server" option is selected. change it to "Use IIS Web Server" option. After that just click on the Create Virtual Directory button to finish the procedure. save the project and you are good to go.

Oh one more thing, for this operation, again you have to run IDE in Run as administrator mode.