How to Use Relative Paths for SQL Express Connection Strings in C# Unit Tests?

Relative Path Connection String for SQL Express in Unit Testing

When using SQL Express databases in unit test projects in C#, the challenge arises in specifying the mdf file location relative to the application's executable. Using an absolute path is inconvenient, and the |DataDirectory| variable, while reserved for web applications, can be leveraged in this scenario.

By combining the ideas from experienced developers, a workable solution emerges. In the app.config file, define the connection string as:

<add name="MyConnectionString"
    connectionString="Server=.\SQLExpress;AttachDbFilename=|DataDirectory|\MyDatabase.mdf;Database=MyDatabaseForTesting;Trusted_Connection=Yes;" />

Within the unit test class, the DataDirectory property can be set dynamically:

[TestInitialize]
public void TestInitialize()
{
    AppDomain.CurrentDomain.SetData("DataDirectory", System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Databases"));

    // Rest of initialize implementation...
}

By setting the DataDirectory property to the path of the database folder relative to the executable, the connection string will successfully locate the mdf file during unit tests. This approach allows for a dynamic connection string that adapts to the deployment environment.

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