private IEnumerable<ImageInfo> LoadFromTxt()
{
if (!Uri.IsFile)
throw new NotImplementedException("Loading slideshows from a remote source is not implemented.");
using (var reader = new StreamReader(Uri.LocalPath))
{
string line = reader.ReadLine();
if (line == null)
yield break;
Uri alternateBaseUri = null;
if (line.StartsWith("#"))
{
alternateBaseUri = new Uri(line.Substring(1).Trim());
line = reader.ReadLine(); // read next line
}
while (line != null)
{
ImageInfo next = null;
try
{
var relativeUri = new Uri(line, UriKind.RelativeOrAbsolute);
if (relativeUri.IsAbsoluteUri)
next = new ImageInfo(relativeUri);
else
{
var uri = new Uri(Uri, relativeUri);
if (uri.IsFile && !File.Exists(uri.LocalPath))
{
// try alternate base uri if the file does not exist
uri = new Uri(alternateBaseUri, relativeUri);
}
next = new ImageInfo(uri);
}
}
catch (UriFormatException)
{
continue;
}
finally
{
line = reader.ReadLine(); // read next line
}
yield return next;
}
}
}
