Class DependencyEventArgs

Namespace

Cuemon.Runtime

Assembly

Cuemon.Core.dll

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

DependencyEventArgs(DateTime)

Initializes a new instance of the DependencyEventArgs class.

public DependencyEventArgs(DateTime utcLastModified)

Parameters

utcLastModified DateTime

Fields

Empty

Represents an event with no event data.

public static readonly DependencyEventArgs Empty

Field Value

DependencyEventArgs

Properties

UtcLastModified

Gets the DateTime value from when a Dependency was last changed, or a MinValue if an empty event.

public DateTime UtcLastModified { get; }

Property Value

DateTime

The DateTime value from when a Dependency was last changed, or a MinValue if an empty event.

Remarks

This property is measured in Coordinated Universal Time (UTC) (also known as Greenwich Mean Time).