DependencyEventArgs Class

Definition

Namespace: Cuemon.Runtime

Assemblies: Cuemon.Core.dll

Source: src/Cuemon.Core/Runtime/DependencyEventArgs.cs

Provides data for dependency related operations.

public class DependencyEventArgs : EventArgs

Inheritance: object

EventArgs

DependencyEventArgs

Examples

DependencyEventArgs provides event data for dependency change notifications, carrying the UTC timestamp of the last modification. This example creates event args with DateTime.UtcNow, a specific past timestamp (2026-06-01T12:00:00Z), and the Empty sentinel representing no change. It also demonstrates raising a DependencyChanged event from a custom DependencyMonitor class and handling it to print the UTC timestamp. Console output displays the last modified timestamp in ISO 8601 format, confirms the Empty sentinel returns MinValue, and shows event-driven output.

using System;
using Cuemon.Runtime;

namespace MyApp.Runtime
{
    public class DependencyEventArgsExamples
    {
        public static void CreateEventArgs()
        {
            // Create event args with the UTC time of the last dependency change.
            var args = new DependencyEventArgs(DateTime.UtcNow);
            Console.WriteLine("Last modified (UTC): {0:O}", args.UtcLastModified);
        }

        public static void CreateEventArgsWithPastTimestamp()
        {
            // Create event args with a specific past timestamp.
            var lastWrite = new DateTime(2026, 6, 1, 12, 0, 0, DateTimeKind.Utc);
            var args = new DependencyEventArgs(lastWrite);
            Console.WriteLine("Last dependency change: {0:O}", args.UtcLastModified);
        }

        public static void UseEmptySentinel()
        {
            // Use the static Empty sentinel to represent no change.
            DependencyEventArgs args = DependencyEventArgs.Empty;
            Console.WriteLine("Is empty: {0}", args.UtcLastModified == DateTime.MinValue); // true
        }

        public static void RaiseDependencyEvent()
        {
            var monitor = new DependencyMonitor();
            monitor.DependencyChanged += (sender, args) =>
            {
                Console.WriteLine("Dependency last changed at: {0:O}", args.UtcLastModified);
            };

            monitor.CheckForChanges();
        }
    }

    public class DependencyMonitor
    {
        public event EventHandler<DependencyEventArgs> DependencyChanged;

        public void CheckForChanges()
        {
            DependencyChanged?.Invoke(this, new DependencyEventArgs(DateTime.UtcNow));
        }
    }
}

Constructors

Name	Description
DependencyEventArgs(DateTime)	Initializes a new instance of the DependencyEventArgs class.

Fields

Name	Description
Empty	Represents an event with no event data.

Properties