private static Dictionary <string, HealthServiceInstance> GetServiceInstances(
XPathNavigator nav,
out string currentInstanceId)
{
Dictionary <string, HealthServiceInstance> instances =
new Dictionary <string, HealthServiceInstance>(StringComparer.OrdinalIgnoreCase);
XPathNavigator instancesNav = nav.SelectSingleNode("instances");
if (instancesNav != null)
{
currentInstanceId = instancesNav.GetAttribute("current-instance-id", string.Empty);
XPathNodeIterator instanceNavs = instancesNav.Select("instance");
foreach (XPathNavigator instanceNav in instanceNavs)
{
HealthServiceInstance instance = HealthServiceInstance.CreateInstance(instanceNav);
instances.Add(instance.Id, instance);
}
return(instances);
}
currentInstanceId = null;
return(null);
}
/// <summary>
/// Gets the instance where a HealthVault account should be created
/// for the specified account location.
/// </summary>
///
/// <param name="connection">
/// The connection to use to perform the operation.
/// </param>
///
/// <param name="preferredLocation">
/// A user's preferred geographical location, used to select the best instance
/// in which to create a new HealthVault account. If there is a location associated
/// with the credential that will be used to log into the account, that location
/// should be used.
/// </param>
///
/// <remarks>
/// If no suitable instance can be found, a null value is returned. This can happen,
/// for example, if the account location is not supported by HealthVault.
///
/// Currently the returned instance IDs all parse to integers, but that is not
/// guaranteed and should not be relied upon.
/// </remarks>
///
/// <returns>
/// A <see cref="HealthServiceInstance"/> object represents the selected instance,
/// or null if no suitable instance exists.
/// </returns>
///
/// <exception cref="HealthServiceException">
/// The HealthVault service returned an error.
/// </exception>
///
/// <exception cref="ArgumentException">
/// If <paramref name="preferredLocation"/> is <b>null</b>.
/// </exception>
///
/// <exception cref="ArgumentNullException">
/// If <paramref name="connection"/> parameter is <b>null</b>.
/// </exception>
public virtual async Task <HealthServiceInstance> SelectInstanceAsync(
IHealthVaultConnection connection,
Location preferredLocation)
{
Validator.ThrowIfArgumentNull(connection, nameof(connection), Resources.TypeManagerConnectionNull);
Validator.ThrowIfArgumentNull(preferredLocation, nameof(preferredLocation), Resources.SelectInstanceLocationRequired);
StringBuilder requestParameters = new StringBuilder();
XmlWriterSettings settings = SDKHelper.XmlUnicodeWriterSettings;
using (XmlWriter writer = XmlWriter.Create(requestParameters, settings))
{
preferredLocation.WriteXml(writer, "preferred-location");
writer.Flush();
}
HealthServiceResponseData responseData = await connection.ExecuteAsync(
HealthVaultMethods.SelectInstance,
1,
requestParameters.ToString()).ConfigureAwait(false);
XPathExpression infoPath = SDKHelper.GetInfoXPathExpressionForMethod(
responseData.InfoNavigator,
"SelectInstance");
XPathNavigator infoNav = responseData.InfoNavigator.SelectSingleNode(infoPath);
XPathNavigator instanceNav = infoNav.SelectSingleNode("selected-instance");
if (instanceNav != null)
{
return(HealthServiceInstance.CreateInstance(instanceNav));
}
return(null);
}