Dynamics 365 Plugins – Pre and Post Images

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When using Dynamics 365 Plugins, we have the ability to view the record data before and after changes have been made. Here we will go through an example.

First, create a new class library in Visual Studio:

Add code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;

namespace Carl.Crm.PrePostImage
    public class CheckAccount : IPlugin
        public void Execute(IServiceProvider serviceProvider)
            Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext)

            ITracingService tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));

            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
                Entity entity = (Entity)context.InputParameters["Target"];

                if (entity.LogicalName == "account")
                    Entity account = (Entity)context.InputParameters["Target"];
                    Entity preImageAccount = (Entity)context.PreEntityImages["Image"];
                    Entity postImageAccount = (Entity)context.PostEntityImages["Image"];

                    string preImagePhoneNumber = preImageAccount.GetAttributeValue<string>("telephone1");
                    string postImagePhoneNumber = postImageAccount.GetAttributeValue<string>("telephone1");

                    tracingService.Trace("Pre-image phone number: {0}, Post-image phone number: {1}", preImagePhoneNumber, postImagePhoneNumber);


Now, register a step:

Register on Post Operation:

We will filter this to run on the telephone1 change:

Now, register an image. Select the Update step we created above:

We will register this on Pre Image and Post Image:

First ensure tracing is enabled in System Settings:

Now we can run the code.

Go to an account and note the phone number:

Change the phone number:

Go to the Plugin Trace Log:

Open the record:

You will see the line we added in the message block:

“Pre-image phone number: 425-488-7759, Post-image phone number: 425-488-7758”



Carl de Souza is a developer and architect focusing on Microsoft Dynamics 365, BI, Web, Cloud and Data Science.

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