How to Create a Calendar Event Using Microsoft Graph API and C#

Microsoft Graph API is a powerful tool that allows developers to access a wide range of Microsoft 365 services, including Outlook and Calendar. In this blog post, we will walk you through the steps to create a calendar event using the Microsoft Graph API and C#. This integration can be incredibly useful for automating event scheduling and managing calendars within your applications.

Prerequisites

Before we dive into the code, you'll need the following:

• Microsoft 365 Account: Ensure you have access to a Microsoft 365 account and have the necessary permissions to create calendar events.
• Azure App Registration: Create an Azure App Registration to obtain the required client ID and client secret for authentication.
• Visual Studio or Visual Studio Code: Use an IDE such as Visual Studio or Visual Studio Code with the necessary C# development tools installed.
• Microsoft.Graph NuGet Package: Install the Microsoft.Graph NuGet package in your project to interact with Microsoft Graph API.

Step 1: Set Up Your Azure App Registratio

Navigate to the Azure portal and create a new App Registration and Note down the Application (client) ID, Tenant ID and generate a client secret. This information will be needed for authentication.

Step 2: Install Microsoft.Graph NuGet Package

In your C# project, install the Microsoft.Graph NuGet package using the package manager console or NuGet package manager in Visual Studio:

Step 3: Create GraphServiceClient

var clientSecretCredential = new ClientSecretCredential(tenantid, clientid, secret);

var _graphServiceClient = new GraphServiceClient(clientSecretCredential);

Step 4: Create a Calendar Event

Now that we have obtained the graphServiceClient, we can use it to create a calendar event using the Microsoft Graph API.

var newEvent = new Event

            {

                Subject = actionPlan.EventTitle,

                Start = new DateTimeTimeZone

                {

                    DateTime = actionPlan.EventStartTime.Value.ToString("o"),

                    TimeZone = TimeZoneInfo.Utc.Id

                },

                End = new DateTimeTimeZone

                {

                    DateTime = actionPlan.EventEndTime.Value.ToString("o"),

                    TimeZone = TimeZoneInfo.Utc.Id

                },

                Location = new Location

                {

                    DisplayName = actionPlan.EventLocation

                },

                Body = new ItemBody

                {

                    Content = notificationBody,

                    ContentType = BodyType.Html

                },

                Attendees = attendeeList,

                ResponseRequested = true

            };

var createdEvent = await graphServiceClient.Users[currentUser].Events.Request().AddAsync(newEvent);

Adjust the event details and date/time as needed for your specific use case.

Conclusion

You have now learned how to create a calendar event using the Microsoft Graph API and C#. Integrating Microsoft Graph API into your applications opens up a world of possibilities for automating and enhancing calendar management within your organization. Happy coding!