I have this method on a webpart:
private IFilterData _filterData = null;
[ConnectionConsumer("Filter Data Consumer")]
public void GetConnectionInterface(IFilterData filterData)
{
_filterData = filterData;
}
Now, before I can call upon _filterData, I need to know when i can expect it to not be null. When is this?!
Without knowing this, the best I can do is stuff all of my _filterWebpart dependent code into the last lines of OnPreRender and hope for the best.
According to this document, it looks like Load.
http://msdn.microsoft.com/en-us/library/ms366536.aspx