Tridion 9.5 CoreService publish method fails

Question

Hi I am trying to publish content using core service, I am getting following error

Value cannot be null.\r\nParameter name: source

here is following code I am using to publish

_client.Publish(new String[] { id }, pid, purposes.toArray(), PublishPriority.Low, new ReadOptions());

not able to understand parameter name: source could someone please suggest me.

Answer 1

The error happens if you call a Linq statement on a null object. The only Linq statement in your code is ToArray(). My guess is that the variable purposes is null.

Answer 2

After lot debugging was able to figure out that on below code

_client.Publish(new String[] { id }, pid, purposes.toArray(), PublishPriority.Low, new ReadOptions());

I was passing string array on purposes i.e. Live, Live1

But Publish method on core-service is expecting id instead of purpose string.

Previously I was fetching purpose string by below line of code

bpt.TargetTypes.Select(targetTypes => targetTypes.Purpose);

but when changed it to

bpt.TargetTypes.Select(targetTypes=> targetTypes.Id);

then Publish method doesn't fail and also push the item to Publish Queue.

Answer 3

Publish Page coreservice example:

// Publish the page
var publishInstruction = new PublishInstructionData
{
     ResolveInstruction = new ResolveInstructionData()
};
PublishTransactionData[] unpublishTransactions = core.Publish(new[] { pageUri }, publishInstruction, destinationTargetUrisOrPurposes, PublishPriority.Normal,new ReadOptions());