Switch Expressions

SwitchExpressions.cs

// Switch Expression with partial string matching
var dict = new Dictionary<int, string>();
var files = new List<string> { "cloud-records.cfg", "ex1-usergroups.cfg", "ex1-users.cfg", "doesntbelong.cfg" };
foreach (var file in files)
{
    var keyName = file switch
    {
        string s when s.Contains("cloud") => ConfigType.CloudConnection,
        string s when s.Contains("usergroups") => ConfigType.FrameSerialNumber,
        string s when s.Contains("users") => ConfigType.PCSerialNumber,
        _ => ConfigFileType.Unknown,
    };
    
    dict.Add(keyName, _fileService.ReadFile(file));
    // dict.SafeAdd(keyName, _fileService.ReadFile(file));
}

// Calling methods from a Switch Expression
// Note, with C# 8, you must define Action and cannot use a throw-away '_'
Action x = httpResponse.StatusCode switch
{
  HttpStatusCode.Accepted => () => _log.Info("Accepted"),
  HttpStatusCode.Conflict => () => _log.Warn("Conflict"),
  _ => () => _log.Error($"Unexpected status code received, {response.StatusCode}"),
};