Property can not be null on trigger

Property Property Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System. Windows Assembly: PresentationFramework. LocalizabilityAttribute AmbientAttribute. In this article. Both collections must exist before the listener starts. This means that either one or both of the Azure Cosmos containers required for the trigger to work do not exist or are not reachable to the Azure Function.

The error itself will tell you which Azure Cosmos database and container is the trigger looking for based on your configuration. The previous versions of the Azure Cosmos DB Extension did not support using a leases container that was created within a shared throughput database. To resolve this issue, update the Microsoft. CosmosDB extension to get the latest version. This error means that you are currently using a partitioned lease collection with an old extension dependency.

Upgrade to the latest available version. This issue appears if you are using the Azure portal and you try to select the Run button on the screen when inspecting an Azure Function that uses the trigger. The trigger does not require for you to select Run to start, it will automatically start when the Azure Function is deployed.

If you want to check the Azure Function's log stream on the Azure portal, just go to your monitored container and insert some new items, you will automatically see the Trigger executing. The concept of a "change" is an operation on a document. The most common scenarios where events for the same document is received are:.

I was getting this error because I was using Trigger instead of DataTrigger and I was binding the trigger to a property in the data context and not to a property in the control per se. Once I changed the Trigger tag to DataTrigger , the error disappeared. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Property can not be null on Trigger Ask Question. Asked 9 years, 11 months ago. Active 11 months ago. Hi - how do I check for the existence of a field in the triggerBody? I cannot check for null or empty as this crashes if the property actually doesnt exist. These do not work equals triggerBody ['partnerId'], null or empty triggerBody ['partnerId'] if "partnerId" doesnt exist. I need to check as my HTTP request can occasionally not send the required property.

Go to Solution. View solution in original post. I also have the same issue where the contains function doesn't work checking for the existance of a property in an array. Exactly the same logic i. I haven't tested it yet, but xilef suggests using '? Seems promising to me:. Thanks LaurenceL , exactly what I was looking for. This expression is not foolproof solution, since it will return 'None' not only when there is no comments property, but also when comments value is empty string.

But for some use cases it may be the most compact. Skip to main content.