private void btnHeadends_Click(object sender, EventArgs e)
{
headEnds = sd.GetHeadends("USA", "10001");
if (headEnds == null)
{
reportErrors();
return;
}
lbContinents.Items.Clear();
lbCountries.Items.Clear();
foreach (var headEnd in headEnds)
{
if (headEnd == null)
{
continue;
}
lbContinents.Items.Add($"{headEnd.headend}\t{headEnd.location}\t{headEnd.transport}");
}
mode = 3;
if (lbContinents.Items.Count > 0)
{
lbContinents.SelectedIndex = 0;
}
}
public IEnumerable <SDHeadendsResponse> GetHeadendData(SDJson sd, string country, string postcode)
{
var headendKey = $"{country},{postcode}";
if (!headendData.ContainsKey(headendKey))
{
var headendDataJS = sd.GetHeadends(country, postcode);
if (headendDataJS != null)
{
headendData.Add(headendKey, headendDataJS);
}
return(headendDataJS);
}
else
{
// Validate oldest cached value
var oldestDate = headendData[headendKey].Where(line => line.cacheDate != null).Select(line => line.cacheDate).Min() ?? DateTime.UtcNow;
if (oldestDate <= DateTime.UtcNow.AddHours(0 - cacheExpiryHours))
{
// Delete cached value and return new value
headendData.Remove(headendKey);
return(GetHeadendData(sd, country, postcode));
}
// Otherwise return from cache
return(headendData[headendKey]);
}
}