Resizing an Image in .NETCF

I’ve seen some people ask how to resize an image or how to stretch an image in .NET Compact Framework in the community. Although the operation is pretty simple, I’ll share a code snippet anyway.

public static Image Resize(Image image, Size size)
{
    Image bmp = new Bitmap(size.Width, size.Height);
    using (var g = Graphics.FromImage(bmp))
    {
        g.DrawImage(
            image,
            new Rectangle(0, 0, size.Width, size.Height),
            new Rectangle(0, 0, image.Width, image.Height),
            GraphicsUnit.Pixel);
    }
    return bmp;
}

What the code above does is to create a new image with the specified new size and draw the source image to fit the new image.


Improve .NETCF Build Performance in Visual Studio

A lot of .NETCF developers are surprisingly not aware of the Platform Verification Task in Visual Studio. Disabling this in the build process will speed up the build of .NETCF projects. To make things quick and short, here’s what you need to do:

1) Open the file C:\WINDOWS\Microsoft.NET\Framework\v3.5\Microsoft.CompactFramework.Common.targets for editing.

2) Change the following in Line 99

<Target
  Name="PlatformVerificationTask">
  <PlatformVerificationTask
    PlatformFamilyName="$(PlatformFamilyName)"
    PlatformID="$(PlatformID)"
    SourceAssembly="@(IntermediateAssembly)"
    ReferencePath="@(ReferencePath)"
    TreatWarningsAsErrors="$(TreatWarningsAsErrors)"
    PlatformVersion="$(TargetFrameworkVersion)"/>
</Target>

to

<Target
  Name="PlatformVerificationTask">
  <PlatformVerificationTask
    Condition="'$(DoPlatformVerificationTask)'=='true'"
    PlatformFamilyName="$(PlatformFamilyName)"
    PlatformID="$(PlatformID)"
    SourceAssembly="@(IntermediateAssembly)"
    ReferencePath="@(ReferencePath)"
    TreatWarningsAsErrors="$(TreatWarningsAsErrors)"
    PlatformVersion="$(TargetFrameworkVersion)"/>
</Target>

The following configuration above was an excert from an article called Platform Verification Task leading to slow builds on compact framework projects


Generic Singleton Implementation

Here’s a helpful class that I’ve been using for implementing singleton objects through the years. This way I can use any class (as long as it has a default constructor) as a singleton object. Originally, I called this class the YetAnotherSingleton< T > but that was simply too unprofessional and I ended up renaming it.

public static class Singleton<T> where T : class, new()
{
    private static readonly object staticLock = new object();
    private static T instance;
 
    public static T GetInstance()
    {
        lock (staticLock)
        {
            if (instance == null)
                instance = new T();
            return instance;
        }
    }
 
    public static void Dispose()
    {
        if (instance == null)
            return;
        var disposable = instance as IDisposable;
        if (disposable != null)
            disposable.Dispose();
        instance = null;
    }
}

And here’s an example of how to use the class above. To improve performance of web service calls its a good idea to use a singleton instance of the web service proxy class.

public static class ServiceClientFactory
{
    public static Service GetService()
    {
        var ws = Singleton<Service>.GetInstance();
        ws.Url = ConfigurationManager.AppSettings["ServiceUrl"];
        ws.Credentials = GetCredentials();
        return ws;
    }
 
    private static ICredentials GetCredentials()
    {
        var username = ConfigurationManager.AppSettings["ServiceUsername"];
        var password = ConfigurationManager.AppSettings["ServicePassword"];
        var domain = ConfigurationManager.AppSettings["ServiceDomain"];
        return new NetworkCredential(username, password, domain);
    }
}

In my next few articles I’ll be sharing code from my design pattern framework that I’ve been using through the years.