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Examples of errors detected by the V310…

Examples of errors detected by the V3106 diagnostic

V3106. Possibly index is out of bound.


FastReport

V3106 Possible negative index value. The value of 'idx' index could reach -1. BarcodeCodabar.cs 70


private int FindBarItem(string c)
{
  for (int i = 0; i < tabelle_cb.Length; i++)
  {
    if (c == tabelle_cb[i].c)
      return i;
  }
  return -1;
}

internal override string GetPattern()
{
  string result = tabelle_cb[FindBarItem("A")].data + "0";

  foreach (char c in text)
  {
    int idx = FindBarItem(c.ToString());
    result += tabelle_cb[idx].data + "0";
  }

  result += tabelle_cb[FindBarItem("B")].data;
  return result;
}

.NET Core Libraries (CoreFX)

V3106 Possibly index is out of bound. The '0' index is pointing beyond '_tables' bound. XMLDiffLoader.cs 277


private ArrayList _tables;
private DataTable GetTable(string tableName, string ns)
{
  ....
  if (_tables.Count == 0)
    return (DataTable)_tables[0];
  ....
}

AvaloniaUI

V3106 Possible negative index value. The value of 'index' index could reach -1. Animator.cs 68


protected T InterpolationHandler(double animationTime, T neutralValue)
{
  ....
  if (kvCount > 2)
  {
    if (animationTime <= 0.0)
    {
      ....
    }
    else if (animationTime >= 1.0)
    {
      ....
    }
    else
    {
      int index = FindClosestBeforeKeyFrame(animationTime);
      firstKeyframe = _convertedKeyframes[index];
    }
    ....
  }
  ....
}

Nethermind

V3106 Possibly index is out of bound. The '0' index is pointing beyond 'bytes' bound. Nethermind.Network ReceiptsMessageSerializer.cs 50


public ReceiptsMessage Deserialize(byte[] bytes)
{
  if (bytes.Length == 0 && bytes[0] == Rlp.OfEmptySequence[0])
    return new ReceiptsMessage(null);
  ....
}

Similar errors can be found in some other places:

  • V3106 Possibly index is out of bound. The '0' index is pointing beyond 'typesInGroup' bound. Nethermind.Runner EthereumStepsManager.cs 70

EFCore

V3106 Possible negative index value. The value of 'index' index could reach -1. EFCore CompositePrincipalKeyValueFactory.cs 68


protected virtual IReadOnlyList<IProperty> Properties { get; }
....
public virtual IProperty FindNullPropertyInKeyValues(object[] keyValues)
{
  var index = -1;
  for (var i = 0; i < keyValues.Length; i++)
  {
    if (keyValues[i] == null)
    {
      index = i;
      break;
    }
  }

  return Properties[index];
}

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