Examples of errors detected by the V3128 diagnostic

V3128. The field (property) is used before it is initialized in constructor.

SharpDevelop

V3128 The 'contentPanel' field is used before it is initialized in constructor. SearchResultsPad.cs 66

Grid contentPanel;
public SearchResultsPad()
{
  ....
  defaultToolbarItems = ToolBarService
    .CreateToolBarItems(contentPanel, ....);
  ....
  contentPanel = new Grid {....};
  ....
}

PascalABC.NET

V3128 The 'dockPanel' field is used before it is initialized in constructor. ICSharpCode.SharpDevelop SearchResultsPad.cs 49

....
DockPanel dockPanel;
....
public SearchResultsPad()
{
  ....
  defaultToolbarItems = ToolBarService.
    CreateToolBarItems(dockPanel, ....);  // <=
  foreach (object toolBarItem in defaultToolbarItems) {
    toolBar.Items.Add(toolBarItem);
  }
  ....
  dockPanel = new DockPanel {
    Children = { toolBar, contentPlaceholder }
  };
  ....
}

.NET Core Libraries (CoreFX)

V3128 The '_index' field is used before it is initialized in constructor. PrinterSettings.Windows.cs 1679

private class ArrayEnumerator : IEnumerator
{
  private object[] _array;
  private object _item;
  private int _index;
  private int _startIndex;
  private int _endIndex;
  public ArrayEnumerator(object[] array, int startIndex, int count)
  {
    _array = array;
    _startIndex = startIndex;
    _endIndex = _index + count; // <=

    _index = _startIndex;
  }
  ....
}

.NET Core Libraries (CoreFX)

V3128 The '_timerInterval' field is used before it is initialized in constructor. TransactionTable.cs 151

internal class TransactionTable
{
  ....
  private int _timerInterval;
  ....
  internal TransactionTable()
  {
    _timer = new Timer(new TimerCallback(ThreadTimer),
                       null,
                       Timeout.Infinite,
                       _timerInterval); // <=

    ....
    _timerInterval = 1 << TransactionTable.timerInternalExponent;
    ....
  }
}

OpenRA

V3128 The 'Frames' field is used before it is initialized in constructor. CursorSequence.cs 35

public class CursorSequence
{
  ....
  public readonly ISpriteFrame[] Frames;

  public CursorSequence(
    FrameCache cache,
    string name,
    string cursorSrc,
    string palette,
    MiniYaml info
  )
  {
    var d = info.ToDictionary();

    Start = Exts.ParseIntegerInvariant(d["Start"].Value);
    Palette = palette;
    Name = name;

    if (
      (d.ContainsKey("Length") && d["Length"].Value == "*") ||
      (d.ContainsKey("End") && d["End"].Value == "*")
    )
      Length = Frames.Length - Start;
    else if (d.ContainsKey("Length"))
      Length = Exts.ParseIntegerInvariant(d["Length"].Value);
    else if (d.ContainsKey("End"))
      Length = Exts.ParseIntegerInvariant(d["End"].Value) - Start;
    else
      Length = 1;

    Frames = cache[cursorSrc]
      .Skip(Start)
      .Take(Length)
      .ToArray();

    ....
  }
}

Orleans

V3128 The 'ActivationId' property is used before it is initialized in constructor. SystemTarget.cs 83

public abstract class SystemTarget : ....
{
  ....
  internal SystemTarget(SystemTargetGrainId grainId,
                        SiloAddress silo,
                        bool lowPriority,
                        ILoggerFactory loggerFactory)
  {
    this.id = grainId;
    this.Silo = silo;
    this.ActivationAddress = GrainAddress.GetAddress(this.Silo,
                                                     this.id.GrainId,
                                                     this.ActivationId); // <=

    this.IsLowPriority = lowPriority;
    this.ActivationId = ActivationId                                     // <=
                        .GetDeterministic(grainId.GrainId);
    this.timerLogger = loggerFactory.CreateLogger<GrainTimer>();
    this.logger = loggerFactory.CreateLogger(this.GetType());
  }
  ....
}