Posts Tagged dependency injection

Replacing simple factories with Func<TResult> delegate

I’ve recently noticed the emergence of a recurring pattern in my code. Each project has the same class in it, and this duplication has really been bothering me. The solution to this repetition just hit me this morning while I was reading Jon Skeet’s “C# In Depth.”

First, let me illustrate the pattern I was using and why it’s a problem.

I’ve been refactoring 1-tiered legacy code into something testable. This has involved creating a data layer class, typically called DataProvider which implements an IDataProvider interface so that I can easily mock out the data access. ┬áNow, because any kind of data access is extremely likely to have unmanaged resources, IDataProvider extends IDisposable.

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Using Hampers Testing: Enter the Factory

I’ve been writing a lot of C# lately, and paying a lot of attention to my test coverage while I’m at it. Everything was going great until I wanted to use the FolderDialogBrowser to let my users select a directory.

FolderDialogBrowser implements IDisposable, so I naturally reached for a Using block.

using (var folderPicker = new FolderBrowserDialog)
{
    if (folderPicker.ShowDialog() != DialogResult.OK)
    {
        return;
    }

    //...
}

Then I stopped dead. I can’t do that. This will display a GUI and any hope of running automated tests against this method is lost. Read the rest of this entry »

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