Category Archives: C#

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16
06
22
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Switching to a different thread with async/await in C#

Posted by | C# |

The code below switches to a different thread when the execution of Main() is resumed at line 11:

internal class Program
{
    static async Task Main(string[] args)
    {
        try
        {
            HttpClient client = new HttpClient();

            Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");
                
            HttpResponseMessage response = await client.GetAsync("https://developernote.com/");

            Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");

            response.EnsureSuccessStatusCode();

            string responseBody = await response.Content.ReadAsStringAsync();

            Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");

            Console.WriteLine(responseBody);
        }
        catch (HttpRequestException e)
        {
            Console.WriteLine("\nException Caught!");

            Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");

            Console.WriteLine($"Message: {e.Message}");
        }
    }
}
(more…)
03
04
18
 3 Comments

How to run WIX bootstrapper application UI with elevated privileges?

Posted by | .NET, C# | Tagged |

WIX bootstrapper application (BA) can easily determine if it runs as admin with the following code:

using System;
using System.Diagnostics;
using System.Security.Principal;

static bool IsAdmin()
{
    WindowsIdentity id = WindowsIdentity.GetCurrent();
    WindowsPrincipal principal = new WindowsPrincipal(id);
    return principal.IsInRole(WindowsBuiltInRole.Administrator);
}

and if it does not, run a new instance as admin and exit:

static void RunAsAdmin()
{
    ProcessStartInfo proc = new ProcessStartInfo
    {
        UseShellExecute = true,
        WorkingDirectory = Environment.CurrentDirectory,
        FileName = Process.GetCurrentProcess().MainModule.FileName,
        Verb = "runas"
    };

    Process.Start(proc);
}

(more…)

15
12
15
 1 Comment

Developing Universal Windows App (UWP) with Xamarin.Forms 2.0 in Visual Studio 2015

Posted by | C#, UWP, Xamarin |

Visual Studio 2015 has “Blank App (Xamarin.Forms Portable)” project template that creates three separate C# projects for Android, iOS and Windows.Phone 8.0 platforms that share the same C#/XAML code via so called PCL (Portable Class Library):

Blank App (Xamarin.Forms Portable)

(more…)

02
04
14
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Using a WPF control in a MFC application

Posted by | .NET, C#, C++, Win32 | Tagged |

I’ve been working on some MFC application and to apply my WPF knowledge I added a WPF control written in C# to my MFC CView with the following code:

int CMyView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;

    try
    {
        gcroot<hwndsource ^> hwnd_source = gcnew HwndSource(0, WS_VISIBLE | WS_CHILD, 0, 0, 0, "HwndSource", IntPtr(m_hWnd));

        MyWpfControl ^ control = gcnew MyWpfControl();

        hwnd_source->RootVisual = control;
    }
    catch (Exception ^ ex)
    {
        String ^ msg = ex->Message;
    }

    return 0;
}

All that I needed to do is to follow the steps described in this post: How do I host WPF content in MFC Applications, fix VS2012 bug described here, and got rid of std::mutex and std::lock_guard replacing them with the following classes using typedefs:

(more…)

12
01
13
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How to pass a Dictionary<Key, Value> from C# to PHP

Posted by | C#, PHP | Tagged , |

I believe that the simplest way to pass complex data from C# to PHP is through WCF service. See my previous post How to implement WCF service in PHP for more details.

Let assume we have a WCF service contract that has the following method with some nested dictionary as a parameter:

[ServiceContract]
public interface IStore
{
    [OperationContract]
    void UpdateRows(Dictionary<int, Dictionary<string, object>> rows);
}

Below I provided the sample implementation of UpdateRows in PHP that iterates through nested dictionaries (first level called ‘rows’ and second level called ‘properties’):

(more…)

19
10
12
 1 Comment

How to implement WCF service in PHP

Posted by | .NET, C#, PHP | Tagged , |

Today I implemented my first PHP Web Service and successfully used it by C# client or, more precisely, I created WCF service contract in C# and implemented it in PHP.  A new option “singlewsdl” in WCF 4.5  helped me a lot. Using this option I generated the service description as a single WSDL-file without additional XSD-files containing the data contracts of the service. Then I uploaded this WSDL-file on my Web Server and written PHP code for all the methods of the service.

(more…)

14
10
12
 1 Comment

Integrating C# and PHP using XML-RPC and WCF

Posted by | .NET, C#, PHP | Tagged , |

While investigating how to make C# and PHP interact with each other I run into an interesting extension of WCF Service Model for working over XML-RPC protocol. I played a bit with this extension and after fixing some bug in its source code I made it work with my little custom XML-RPC server implemented as Joomla XML-RPC plugin.

(more…)

13
10
12
 1 Comment

How to make PHP Web Service with NuSoap

Posted by | C#, PHP | Tagged , |

While investigating how to create a Web Service in PHP I run into NuSoap library, that can generate WSDL based on some matadata describing Web Service method signatures and the data structures. I downloaded NuSoap library and found some trivial sample that started working after adding the highlighted line of code:

(more…)

08
10
12
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How to specify WPF control size in millimeters using XAML

Posted by | .NET, C# | Tagged |

The first thing that we need to do to use millimeters in XAML is to define simple Mm2PixelConverter class that performs the conversion from millimeter to pixels:

[ValueConversion(typeof(double), typeof(double))]
class Mm2PixelConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        double mm = (double)value;

        return WinUtil.Mm2Pixel(mm);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
}

(more…)

16
05
12
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Using ADO.NET Entity Framework with MySQL

Posted by | .NET, C#, MySQL | Tagged |

In general, getting EF work with MySQL is a fairly simple task, that could be accomplished by downloading and installing ADO.NET driver for MySQL. But what concerns to me, it taken me about four hours to clarify some MySQL-specific details that affect generation of associations in Model Designer. Also after doing an experimentation with the code I realized that ADO.NET driver for MySQL, as well as other third party ADO.NET drivers, do not support “MARS” and, as far as I see, this significant restriction makes EF unusable with MySQL in large real-life projects. Please read below if you interested in more information on this questions.
(more…)

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