/// <summary>
/// Enumerates through location code boundary features.
/// </summary>
/// <param name="quarterYear">A quarter year.</param>
/// <param name="targetProjection">Optional. Provide to reproject from 2927.</param>
/// <returns>Returns an <see cref="IEnumerable<T>"/> of <see cref="Feature"/> objects.</returns>
public static IEnumerable<IFeature> EnumerateLocationCodeBoundaries(QuarterYear quarterYear, ProjectionInfo targetProjection = null)
{
var uri = new Uri(string.Format(_locCodeBoundariesShpUrlPattern, quarterYear.GetDateRange()[0], quarterYear.Quarter));
// Get the path to the TEMP directory.
string tempDirPath = Path.GetTempPath();
string dir = Path.Combine(tempDirPath, Path.GetRandomFileName());
DirectoryInfo dirInfo = Directory.CreateDirectory(dir);
string shp_name = null;
try
{
var client = new HttpClient();
client.GetStreamAsync(uri).ContinueWith(st =>
{
// Write the shapefile to a temporary location.
using (var zipArchive = new ZipArchive(st.Result, ZipArchiveMode.Read))
{
foreach (var entry in zipArchive.Entries)
{
using (var outfile = File.Create(Path.Combine(dir, entry.Name)))
using (var sourcefile = entry.Open())
{
sourcefile.CopyToAsync(outfile).Wait();
}
if (entry.Name.EndsWith(".shp", StringComparison.InvariantCultureIgnoreCase))
{
shp_name = Path.Combine(dir, entry.Name);
}
}
}
}).Wait();
foreach (var kvp in EnumerateLocationCodeBoundaries(shp_name, targetProjection))
{
yield return kvp;
}
}
finally
{
dirInfo.Delete(true);
}
}
