C# & .NET technologies : Visual Studio 2013

Demos and Slides of my session about R and DataScience at ATD12 conference

Bahrudin — Wed, 16 Nov 2016 20:29:00 GMT

Today, I gave session at Advanced Technology Day conference in Zagreb. It was very excited to see full room of people at the presentation, mostly developers from .NET world interesting in R and Data Science. This is good sign that the Data Science and the R are becoming more and more popular at daily basis. Most popularity for the R will bring R Tool for Visual Studio, which means the R language became member of the family of the Visual Studio.

For those who was asking about my slides and demo sample here is the information:

Presentation slides can be downloaded here,
Source code of the demo is hosted at git hub at: http://github.com/bhrnjica/R-Workshop
For more information about R , you can see my YouTube channel about R and Machine Learning at this link.

See you next time!

error CS0433 for 'System.Windows.Automation' type

Bahrudin — Tue, 16 Jun 2015 15:41:00 GMT

Few days ago I had a strange issue in one of my Visual Studio 2013 solution. The Test project required functionality of System.Windows.Automation, and I have added assembly UIAutomationClient. When tried to run tests I got the folowing compiler error:

error CS0433: The type 'System.Windows.Automation.AutomationElement' exists in both 'c:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\PublicAssemblies\UIAComWrapper.dll' and 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\UIAutomationClient.dll'

It was strange issue, because I didn't add UiaComWrapper assembly. Tried to remove the assembly, but as soon I run test the previous error appeared.

Fixing the issue

To fix this issue we have to use "Reference Alias" which is specified here. So for our assembly UIAutomatisationClient change the Alias from "global" to "UIAutomationClientAlias". See picture below.

Now that we defined new alias, in the following text it is shown how to use it in your cs file. Open the cs file we have error.

1. At the top opf the file put the folowing line:

extern alias UIAutomationClientAlias;

2. Define using namespace from the new alias:

using Autom = UIAutomationClientAlias::System.Windows.Automation;

3. Now we can use all members from Automation class safely, and the compiler error is despaired.

How to run code daily at specific time in C# Part 2

Bahrudin — Mon, 13 Oct 2014 05:30:00 GMT

Few months ago I wrote blog post about how to run code daily at specific time. I dint know that the post will be the most viewed post on my blog. Also there were several questions how to implement complete example. So today I have decided to write another post, and extend my previous post in order to answer thise question as well as to generalize this subject in to cool demo called Scheduler DEMO.

The post is presenting simple Windows Forms application which calls a method for every minute, day, week, month or year. Also demo shows how to cancel the scheduler at any time.

The picture above shows simple Windows Forms application with two numeric control which you can set starting hour and minute for the scheduler. Next there is a button Start to activate timer for running code, as well as Cancel button to cancel the scheduler. When the time is come application writes the message on the Scheduler Log.

Implementation of the scheduler

Scheduler is started by clicking the Start button which is implemented with the following code: /// <summary> /// Setting up time for running the code /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void startBtn_Click(object sender, EventArgs e) { //retrieve hour and minute from the form int hour = (int)numHours.Value; int minutes = (int)numMins.Value; //create next date which we need in order to run the code var dateNow = DateTime.Now; var date = new DateTime(dateNow.Year, dateNow.Month, dateNow.Day, hour, minutes, 0); listBox1.Items.Add("**********Scheduler has been started!*****"); //get nex date the code need to run var nextDateValue=getNextDate(date,getScheduler()); runCodeAt(nextDateValue, getScheduler()); } When the time is defined then the runCodeAt method is called which implementation can be like the following; /// <summary> /// Determine the timeSpan Dalay must wait before run the code /// </summary> /// <param name="date"></param> /// <param name="scheduler"></param> private void runCodeAt(DateTime date,Scheduler scheduler ) { m_ctSource = new CancellationTokenSource(); var dateNow = DateTime.Now; TimeSpan ts; if (date > dateNow) ts = date - dateNow; else { date = getNextDate(date, scheduler); ts = date - dateNow; } //enable the progressbar prepareControlForStart(); //waits certan time and run the code, in meantime you can cancel the task at anty time Task.Delay(ts).ContinueWith((x) => { //run the code at the time methodToCall(date); //setup call next day runCodeAt(getNextDate(date, scheduler), scheduler); },m_ctSource.Token); } The method above creates the cancelationToken needed for cancel the scheduler, calculate timeSpan - total waiting time, then when the time is come call the method methodToCall and calculate the next time for running the scheduler. This demo also shows how to wait certain amount of time without blocking the UI thread.

The full demo code can be found on OneDrive.

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How to extract default file icon in WPF application

Bahrudin — Wed, 28 May 2014 10:40:00 GMT

In Windows every file has default icon, and it is shown in Windows Explorer while browsing files on disk. If you want to grab this icon in WPF application there are several ways. One of the solution is by using ExtractAssociatedIcon from Icon class located in System.Drawing namespace. The following code shows how to extract default icon from the file specified by file name: [sourcecode lang="csharp"] var sysicon = System.Drawing.Icon.ExtractAssociatedIcon(filePath); var bmpSrc = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon( sysicon.Handle, System.Windows.Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()); sysicon.Dispose(); [/sourcecode] Explanation of the code above is straightforward.First we need file path, then we need to call Icon.ExtractAssociatedIcon(filePath) to get Icon object. From the icon object we can create BitmapSource which can be show everywhere in the WPF application. Complete source code demo can be found here.

Configuring Visual Studio 2013 to use Git as Source Control

Bahrudin — Wed, 07 May 2014 19:54:00 GMT

Visual Studio 2013 has ability to integrate Git source control. The blog post will shows in details how to configure Visual Studio to use Git, with remote repository at git.com. Configuration can be divided in several parts. 1. Installing required softwares 2. Creating SSH key and uploading to Git server 3. Configuring local Git repository and sync with remote server 4. Check in and check out source code.

Installing Git Extensions

Only software you have to install is Git Extensions for Windows which you can find on: http://code.google.com/p/gitextensions/ 1. After you download Git Extension installer, start the installation process. The following images show step during the installation process.

At this step,in some case you can get the error in the installation with the following message: 'Installation directory must be on local hard drive' In that case, open Command Prompt with Administrator priviledge, go to folder GitInstaller is downloaded and type the following command: msiexec /i GitExtensions.msi WIXUI_DONTVALIDATEPATH="1" where GitExtension.msi is the name of your installer. Continue with installation:

Now proceed with installation of two installers: KDiff and GIT. Follow the default setup options:

Finish the installation process:

Creating SSH key and uploading to Git server

After you installed Git Extension open the Git Extention from Desktop : Put UserName and Email to login information:

By clicking on OK button, Git Extension displays start screen. From Tools menu choose Git Bash command line tool to create SSH key.

From the picture below follow the instruction how to create SSH Key. type: ssh-keygen - rsa -C email@company.com, and press enter 4 times. By pressing Enter you accept default options.

After you create the key, you have to add it to local agent. 1. First start local agent: exec ssh-agent Bash 2. Type ssh-add ~/.ssh/id_rsa

Add SSH key to GitHub 1. Open you Git Hub account 2. Go to Settings 3. Add SSH Tab 4. Press AddKey 5. Copy the Content of the id_rsa.pub (see picture below) 6. Paste to GitHub SSH key tab

You can test your account by typing ssh-T git@github.com to command line.

Now you are ready to use GitHub Source control.

Configuring local Git repository and sync with remote server

1. Define local repository path: C:/tfs/Git 2. Open GitExtensions: Open local repository:

2. Initialize local repository

Setup Remote Repository by specifing Name and SSH path of the project:

By pressing Save Changes from the last image, you setp the project and it is ready to be opened in Visula Studio. Open Visual Studio 2013 Add local repository to Git Double click on the project to get solution file to open: