There are some things they do not seem correct.
First, for reading, you should use ReadMultipleItemValues method. The use of OPC properties is very inefficient, and has other disadvantages as well. It is true that the value can be accessed as a property as well, but that should avoided unless there is a specific need for it.
Second, your code, as presented, does not compile: "ItemDesecriptors" is declared as an array of DAPropertyArguments, but assigning a single DAPropertyObjects object to it inside each loop gives a "Cannot convert...." compiler error. Unless I am missing something, please rather send the actual code so that my reasoning can be valid.
Third, assuming that "somehow" this compiles, assigning into ItemDescriptors inside each loop will overwrite its value - it shoud instead place the value into appropriate element inside the array.
I do not have an example of ReadMultipleItemValues right at hand, but I have one that uses ReadMultipleItems (which is even better because it gives you back data qualities and timestamps). Here it is, maybe it helps:
Code:
public static void Main()
{
var easyDAClient = new EasyDAClient();
DAVtqResult[] vtqResults = easyDAClient.ReadMultipleItems("OPCLabs.KitServer.2",
new DAItemDescriptor[] { "Simulation.Random", "Trends.Ramp (1 min)", "Trends.Sine (1 min)", "Simulation.Register_I4" });
for (int i = 0; i < vtqResults.Length; i++)
{
Debug.Assert(vtqResults[i] != null);
Console.WriteLine("vtqResult[{0}].Vtq: {1}", i, vtqResults[i].Vtq);
}
}
If you still would not be able to put it together, let me know and I will try to write that piece for you.
Best regards
