private void ApplyEventArgsChanges(FileSystemVisitorEventArgs args)
{
switch (args.State)
{
case FileSystemVisitorEventArgsStates.None:
break;
case FileSystemVisitorEventArgsStates.StopOnFirstFindedCoincidence:
this.action = FileSystemVisitorAction.Interrupt;
break;
case FileSystemVisitorEventArgsStates.IgnoreThisEntry:
this.action = FileSystemVisitorAction.Ignore;
break;
default:
throw new ArgumentOutOfRangeException(nameof(args.State), args.State, "FileSystemVisitorEventArgs state is out of range");
}
}
private IEnumerable <FileSystemInfo> HandleEntries(IEnumerable <FileSystemInfo> entries)
{
foreach (var entry in entries)
{
if (this.action.HasFlag(FileSystemVisitorAction.Ignore))
{
this.action ^= FileSystemVisitorAction.Ignore;
}
if (this.action.HasFlag(FileSystemVisitorAction.Interrupt))
{
break;
}
DirectoryInfo directoryInfo = entry as DirectoryInfo;
FileInfo fileInfo = entry as FileInfo;
bool isPassed = this.Filter(entry);
if (directoryInfo != null)
{
this.InvokeConsiderFilter(this.DirectoryFound,
this,
new FileSystemVisitorEventArgs
{
Message = directoryInfo.FullName,
Value = directoryInfo,
});
if (isPassed)
{
this.InvokeConsiderFilter(this.FilteredDirectoryFound,
this,
new FileSystemVisitorEventArgs
{
Message = directoryInfo.FullName,
Value = directoryInfo,
});
if (this.action == FileSystemVisitorAction.Ignore)
{
continue;
}
yield return(entry);
}
}
if (fileInfo != null)
{
this.InvokeConsiderFilter(this.FileFound,
this,
new FileSystemVisitorEventArgs
{
Message = fileInfo.FullName,
Value = fileInfo,
});
if (isPassed)
{
this.InvokeConsiderFilter(this.FilteredFileFound,
this,
new FileSystemVisitorEventArgs
{
Message = fileInfo.FullName,
Value = fileInfo,
});
if (this.action == FileSystemVisitorAction.Ignore)
{
continue;
}
yield return(entry);
}
}
}
}
public FileSystemVisitor(Func <FileSystemInfo, bool> filter)
{
this.Filter = filter;
this.action = FileSystemVisitorAction.None;
}
