1. Start Visual Studio.
2. Select File > New > Project.
3. Select Class Library (.NET Framework) and select Next.

4) Select the Browse tab, search for and select microsoft.crmsdk.coreassemblies, and then select Install.

5) Add the using statements to the new class as follows:

Code:-
using Microsoft.Xrm.Sdk;
using System.Text.RegularExpressions;

6) Implement the interface member.

Task 2: Format a phone number

Code:-

IPluginExecutionContext context =(IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

2) Check the input parameter for Target. Add the following snippet to the Execute method.

Code:-

if (!context.InputParameters.ContainsKey(“Target”))
throw new InvalidPluginExecutionException(“No target found”);

3) Add the following snippet to the Execute method. This snippet will get the target entity from the input parameter and then check if its attributes contain telephone1 (Business Phone for Contacts, Phone for Accounts).

Code:-
var entity = context.InputParameters[“Target”] as Entity;
if (!entity.Attributes.Contains(“telephone1”))
return;

4) Add the following snippet to the Execute function. This snippet will remove all nonnumeric characters from the user-provided phone number.

Code:-
string phoneNumber = (string)entity[“telephone1″];
var formattedNumber = Regex.Replace(phoneNumber, @”[^\d]”, “”);

5)Set telephone1 to the formatted phone number. Add the following snippet to the Execute method.

Code:-
entity[“telephone1”] = formattedNumber;

Topic 3: Register a plug-in and steps

1) Start the plug-in registration tool that is in your Dynamics 365 SDK folder.

 Note:-
If you don’t have the Dynamics 365 SDK tools, see Download tools from NuGet to download.

Exercise 2: Create/Retrieve plug-ins

you will create a plug-in that will run on retrieve. This plug-in will add parentheses and dashes to the phone numbers.

Task 1: Create a plug-in

1) Start Visual Studio.
2) Open the project that you created in Exercise 1.
3) Right-click the project and select Add > Class.

4) Add the using statements to the new class as follows:

using Microsoft.Xrm.Sdk;

Task 2: Update plug-in assembly and register steps and Test

References:-

Exercise – Write your first plug-in – Training | Microsoft Learn