As per the Event Execution Pipeline for plugins in Dynamics 365, here we will look at a pre-validation plugin.
These plugins execute before the main system operation and outside the database transaction. Pre-validation runs before validation occurs. You can also modify values at this stage, though this may be generally done in pre-operation. If you are creating a record, as the record is not created at this point, you will not have a record GUID.
In Visual Studio, create a new Class Library:
Through NuGet, add the latest Microsoft.CrmSdk.CoreAssemblies:
Add:
using Microsoft.Xrm.Sdk;
We will call our class UpdateAccount, IPlugin with an Execute method:
Add the code. We will update the fax number of the account:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Microsoft.Xrm.Sdk; namespace Carl.PluginPreValidationSample { public class UpdateAccount : IPlugin { public void Execute(IServiceProvider serviceProvider) { IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext)); if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity) { Entity entity = (Entity)context.InputParameters["Target"]; if (entity.LogicalName == "account") { if (entity.Attributes.Contains("fax") == false) { entity.Attributes.Add("fax", "1112221111"); } } } } } }
Sign the assembly:
Now open the Plugin Registration Tool and register:
Click Register Selected Plugins:
Click Register New Step. We make this an update to account, pre-validation:
Note as this is pre-validation, it needs to be synchronous and cannot be asynchronous.
Now we can test this. On an account record, insert a fax number:
After saving and refreshing, we can see the fax has been overwritten by our plugin:
We can see if we run this in the debugger, the Execution Pipeline stage is 10 (pre-event, pre-validation). As this executes outside the database, the IsInTransaction is false:
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[…] Pre-validation […]
This won’t work with your sample. The if statement to check for fax number will fail as the fax attribute will be there. Thoughts?