/// <summary>
/// Begins an asynchronous read operation for a set of items.
/// </summary>
/// <param name="items">The set of items to read (must include the item name).</param>
/// <param name="requestHandle">An identifier for the request assigned by the caller.</param>
/// <param name="callback">A delegate used to receive notifications when the request completes.</param>
/// <param name="request">An object that contains the state of the request (used to cancel the request).</param>
/// <returns>A set of results containing any errors encountered when the server validated the items.</returns>
public OpcItemResult[] Read(
TsCDaItem[] items,
object requestHandle,
TsCDaReadCompleteEventHandler callback,
out IOpcRequest request)
{
return(_subscription.Read(items, requestHandle, callback, out request));
}
/// <summary>
/// Begins an asynchronous read operation for a set of items.
/// </summary>
/// <param name="items">The set of items to read (must include the item name).</param>
/// <param name="requestHandle">An identifier for the request assigned by the caller.</param>
/// <param name="callback">A delegate used to receive notifications when the request completes.</param>
/// <param name="request">An object that contains the state of the request (used to cancel the request).</param>
/// <returns>A set of results containing any errors encountered when the server validated the items.</returns>
public OpcItemResult[] Read(
TsCDaItem[] items,
object requestHandle,
TsCDaReadCompleteEventHandler callback,
out IOpcRequest request)
{
LicenseHandler.ValidateFeatures(LicenseHandler.ProductFeature.DataAccess);
return(Subscription.Read(items, requestHandle, callback, out request));
}