Filter data from Microsoft graph

Question

I have all my in a list

public partial class CalendarPageViewModel(GraphServiceClient graphClient) : ObservableObject {
    public ObservableCollection<Event> CalendarEvents { get; set; } = [];
    public async Task FetchCalendarEventsAsync() {
        var graphEventsResponse = await graphClient.Me.Events.GetAsync();
        if(graphEventsResponse != null) {
            foreach(var items in graphEventsResponse?.Value!) {
                CalendarEvents.Add(items);
            }
        }

But that is giving me all the event from the calendar, but I don't care about past events, I want to get the events from today going forward

I tried this code

        var today = DateTime.UtcNow.ToString("o"); 
        var graphEventsResponse = await graphClient.Me.Events.GetAsync(requestConfiguration =>
        {
            requestConfiguration.QueryParameters.Filter = $"start/DateTime ge {today}";
            requestConfiguration.QueryParameters.Orderby = new List<string> { "start/DateTime asc" };
        });
        if (graphEventsResponse != null)
        {
            CalendarEvents.Clear();
            foreach (var item in graphEventsResponse.Value!)
            {
                CalendarEvents.Add(item);
            }
        }

and I get the error of debugger is not attach to this project error

Answer 1

Your filter parameter is incorrect. The comparison should be against a string value in quotes. Try something like this.

var today = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ss");

var graphEventsResponse = await graphClient.Me.Events.GetAsync(config => {
    config.QueryParameters.Filter = $"start/DateTime ge '{today}'";
    config.QueryParameters.Orderby = new[] { "start/DateTime asc" };
});