Troubleshooting: No multiple downloads are eligible for System.Timers.ElapsedEventHandler delegation

This is one of the last key features in the actual case: Reminder notifications

The strange situation encountered

The current setup is to combine a Timer with a Windows Form, which is the download for sending notifications

As we all know, there are three built-in timer available in C # Environment: Windows Form Timer, System.timer, Threading.timer

The strange things that are encountered, mainly in System.timer this section

The codes are as follows:

usingSystem;usingSystem.Drawing;usingSystem.Text;usingSystem.Threading;usingsystem.timers;usingSystem.Windows.Forms;namespacesystemtimer{ Public Partial classForm1:form {intNumber =0; DateTime DT1=NewDateTime (); DateTime DT2=NewDateTime ();        System.Timers.Timer TM;  PublicForm1 () {InitializeComponent (); }        Private voidForm1_Load (Objectsender, EventArgs e) {        }        Private voidB1_click (Objectsender, EventArgs e) {TM=NewSystem.Timers.Timer (); Tm. Interval= -; Tm. Enabled=true; TM. Elapsed + = new System.Timers.ElapsedEventHandler (tm_elapsed); Tm.            Start (); DT1=DateTime.Now; }        Private voidB2_click (Objectsender, EventArgs e) {TM. Enabled=false; DT2=DateTime.Now; MessageBox.Show (convert.tostring (DT2-dt1)); }        Private voidTm_elapsed (Objectsender, System.Timers.ElapsedEventHandler e) {lbmsg. Text= convert.tostring (+ +Number ); Thread.Sleep ( the); }    }}

When you edit the red line, you are prompted to do something wrong, so you can take a look at the official information of the software.

Back to the prototype of the function

 Public Delegate void elapsedeventhandler (    Object sender,    elapsedeventargs e)

So just put

        Private void tm_elapsed (objectSystem.Timers.ElapsedEventHandler e)        {            = convert.tostring (+ + number);            Thread.Sleep (+);        }

Change into

        Private void tm_elapsed (objectSystem.Timers.ElapsedEventArgs e)        {            = Convert.ToString (+ + number);            Thread.Sleep (+);        }

You can do it.

Troubleshooting: No multiple downloads are eligible for System.Timers.ElapsedEventHandler delegation