Maui app async/await debugging issue

Question

Maui app async/await debugging issue

Haviv Elbsz 2,071

Hi all

Debugging a sync app is straightforward but debugging
async/await is not.

Can someone direct me how to do that

Thank you very much

AgaveJoe 30,126 Reputation points

2022-11-24T14:37:56.167+00:00

Debugging a sync app is straightforward but debugging async/await is not.

You have to understand, the community has no idea why debugging async/await is not straightforward to you. Can you provide a code sample and your current debugging approach?

Are you taking advantage of standard logging?
Haviv Elbsz 2,071 Reputation points

2022-11-24T14:56:08.137+00:00

I posted it as answer because of size

the if endif directives are to skip async debugging

thank you for any help

2 answers

Your answer

AgaveJoe 30,126 Reputation points

2022-11-24T14:37:56.167+00:00

Debugging a sync app is straightforward but debugging async/await is not.

You have to understand, the community has no idea why debugging async/await is not straightforward to you. Can you provide a code sample and your current debugging approach?

Are you taking advantage of standard logging?
Haviv Elbsz 2,071 Reputation points

2022-11-24T14:56:08.137+00:00

I posted it as answer because of size

the if endif directives are to skip async debugging

thank you for any help

Answer 1

 private async void RunButton_Clicked(object sender, EventArgs e)  
 {  

   progressBar.Progress = 0.0;  

   if(!IsAppRunning)  
   {  
     IsAppRunning = true;  
     RunButton.Text = "Cancel";  
     RunButton.TextColor = Colors.White;  
     RunButton.Background = Colors.Red;  

     m_cancelTokenSource = new CancellationTokenSource();  

     try  
     {

if (!DEBUG)

       if (actionOperator == "mul")  
         if (CheckIsThisASpatialMul())  
           await alfaStarsSpatialMul(m_cancelTokenSource.Token);  
         else  
           await alfaStarsMul(m_cancelTokenSource.Token);  

       else if (actionOperator == "div0")  
         await alfaStarsSpatialDiv(m_cancelTokenSource.Token);  
       else if (actionOperator == "div1")  
         await alfaStarsDiv1(m_cancelTokenSource.Token);  
       else if (actionOperator == "div2")  
         await alfaStarsDiv2(m_cancelTokenSource.Token);  
       else if (actionOperator == "div3")  
         await alfaStarsDiv3(m_cancelTokenSource.Token);  
       else if (actionOperator == "div4")  
         await alfaStarsDiv4(m_cancelTokenSource.Token);  

       else if (actionOperator == "addsub")  
         await alfaStarsAdSb(m_cancelTokenSource.Token);  

       else if (actionOperator == "add")  
         await alfaStarsAdd(m_cancelTokenSource.Token);  

       else if (actionOperator == "sub")  
         await alfaStarsSub(m_cancelTokenSource.Token);  

       else if (actionOperator == "sqr")  
         await alfaStarsSqr(m_cancelTokenSource.Token);  

       else  
       {  
         //thisMsg = "Wrong Input : \r\n";  
       }

endif

if (DEBUG)

       if (actionOperator == "mul")  
         if (CheckIsThisASpatialMul())  
           alfaStarsSpatialMul();  
         else  
           alfaStarsMul();  

       else if (actionOperator == "div0")  
         alfaStarsSpatialDiv();  
       else if (actionOperator == "div1")  
         alfaStarsDiv1();  
       else if (actionOperator == "div2")  
         alfaStarsDiv2();  
       else if (actionOperator == "div3")  
         alfaStarsDiv3();  
       else if (actionOperator == "div4")  
         alfaStarsDiv4();  

       else if (actionOperator == "addsub")  
         alfaStarsAdSb();  

       else if (actionOperator == "add")  
         alfaStarsAdd();  

       else if (actionOperator == "sub")  
         alfaStarsSub();  

       else if (actionOperator == "sqr")  
         alfaStarsSqr();  

       else  
       {  
         //thisMsg = "Wrong Input : \r\n";  
       }

endif

     }  
     catch (OperationCanceledException)  
     {  
       //  
     }  
     finally  
     {  

       RunButton.Text = "Start";  
       RunButton.TextColor = Colors.White;  
       RunButton.Background = Microsoft.Maui.Graphics.Color.FromArgb("512BD4");  
       IsAppRunning = false;  
       m_cancelTokenSource = null;  
       progressBar.Progress = 0.0;  

     }  
   }  
   else  
   {  
     m_cancelTokenSource.Cancel();  
   }  

   return;  

 }

//-----------------------------------------------------------------------------

if (DEBUG)

 public void alfaStarsSpatialMul()  
 {

endif

if (!DEBUG)

 public Task alfaStarsSpatialMul(CancellationToken ct)  
 {  
   return Task.Run(() =>  
   {

endif

     try  
     {  
       int cnt;  
       int starsQty = 0;  
       int i;  
       ulong loopsCnt = 0;  


       for(combs = 0; combs < combsCnt; combs++)  
       {

if (!DEBUG)

         progValue = (double)combs / (double)combsCnt;            
         MainThread.BeginInvokeOnMainThread(() => { progressBar.Progress = progValue; });

endif

         iPN = 1;  
         while (iPN < PN)  
         {  


             iPY = 0;  
             while(iPY < PY)//*** while(iPY < PY) Algorithm section ******************  
             {

if (!DEBUG)

               if (ct.IsCancellationRequested)  
               {     
                 stopwatch.Stop();  
                 strOutputTBText += $"\r\nCanceled at Loop {loopsCnt}";  
                 strOutputTBText += "\r\n";  
                 strOutputTBText += "Time elapsed:\r\n" + stopwatch.Elapsed;  
                 strOutputTBText += "\r\n";  

                 MainThread.BeginInvokeOnMainThread(() => {OutputTB.Text += strOutputTBText;});  

                 if (fromToCKB.IsChecked == false) IsFromToSetToZero = false;  
                 if(alphaCKB.IsChecked == false) IsAlphaMode = false;  

                 throw new OperationCanceledException(ct);  
               }

endif

             }// while(iPY < PY)  


         }// while (iPN < PN)  



       }//for(combs  


       strOutputTBText += $"\r\n {loopsCnt} Loops";  
       strOutputTBText += "\r\n";  

       stopwatch.Stop();  
       strOutputTBText += "Time elapsed:\r\n" + stopwatch.Elapsed;  
       strOutputTBText += "\r\n";  
       MainThread.BeginInvokeOnMainThread(() => {OutputTB.Text += strOutputTBText;});  
       NoSolution();  
     }  
     catch (Exception ex)  
     {  
       if(ex.ToString().Contains("OperationCanceledException"))  
       {  
         //  
       }  
       else  
       {  
         strOutputTBText += "\r\n\r\n";  
         strOutputTBText += $"Exception = " + ex + "\r\n";  
         strOutputTBText += $"Invalid Puzzle";  
         strOutputTBText += "\r\n\r\n";  
         MainThread.BeginInvokeOnMainThread(() => {OutputTB.Text += strOutputTBText;});  
       }  
     }  
     finally  
     {  
      if (fromToCKB.IsChecked == false) IsFromToSetToZero = false;  
      if(alphaCKB.IsChecked == false) IsAlphaMode = false;  
       progressBar.Progress = 0.0;  
     }

if (!DEBUG)

   }, ct);

endif

 }//alfaStarsSpatialMul()

Answer 2

Notes: This async/await pattern was taken from Arlen Feldman's website

Handling long operations with cancel and progress in C# with async
https://cowthulu.com/handling-long-operations-with-cancel-and-progress-in-c-with-async/

I addopt it to fit my need as shown below

The #if #endif directives is for skiping async debuging

 private async void RunButton_Clicked(object sender, EventArgs e)  
 {  

   progressBar.Progress = 0.0;  

   if(!IsAppRunning)  
   {  
     IsAppRunning = true;  
     RunButton.Text = "Cancel";  
     RunButton.TextColor = Colors.White;  
     RunButton.Background = Colors.Red;  

     m_cancelTokenSource = new CancellationTokenSource();  

     try  
     {

if (!DEBUG)

       if (actionOperator == "mul")  
         if (CheckIsThisASpatialMul())  
           await alfaStarsSpatialMul(m_cancelTokenSource.Token);  
         else  
           await alfaStarsMul(m_cancelTokenSource.Token);  

       else if (actionOperator == "div0")  
         await alfaStarsSpatialDiv(m_cancelTokenSource.Token);  
       else if (actionOperator == "div1")  
         await alfaStarsDiv1(m_cancelTokenSource.Token);  
       else if (actionOperator == "div2")  
         await alfaStarsDiv2(m_cancelTokenSource.Token);  
       else if (actionOperator == "div3")  
         await alfaStarsDiv3(m_cancelTokenSource.Token);  
       else if (actionOperator == "div4")  
         await alfaStarsDiv4(m_cancelTokenSource.Token);  

       else if (actionOperator == "addsub")  
         await alfaStarsAdSb(m_cancelTokenSource.Token);  

       else if (actionOperator == "add")  
         await alfaStarsAdd(m_cancelTokenSource.Token);  

       else if (actionOperator == "sub")  
         await alfaStarsSub(m_cancelTokenSource.Token);  

       else if (actionOperator == "sqr")  
         await alfaStarsSqr(m_cancelTokenSource.Token);  

       else  
       {  
         //thisMsg = "Wrong Input : \r\n";  
       }

endif

if (DEBUG)

       if (actionOperator == "mul")  
         if (CheckIsThisASpatialMul())  
           alfaStarsSpatialMul();  
         else  
           alfaStarsMul();  

       else if (actionOperator == "div0")  
         alfaStarsSpatialDiv();  
       else if (actionOperator == "div1")  
         alfaStarsDiv1();  
       else if (actionOperator == "div2")  
         alfaStarsDiv2();  
       else if (actionOperator == "div3")  
         alfaStarsDiv3();  
       else if (actionOperator == "div4")  
         alfaStarsDiv4();  

       else if (actionOperator == "addsub")  
         alfaStarsAdSb();  

       else if (actionOperator == "add")  
         alfaStarsAdd();  

       else if (actionOperator == "sub")  
         alfaStarsSub();  

       else if (actionOperator == "sqr")  
         alfaStarsSqr();  

       else  
       {  
         //thisMsg = "Wrong Input : \r\n";  
       }

endif

     }  
     catch (OperationCanceledException)  
     {  
       //  
     }  
     finally  
     {  

       RunButton.Text = "Start";  
       RunButton.TextColor = Colors.White;  
       RunButton.Background = Microsoft.Maui.Graphics.Color.FromArgb("512BD4");  
       IsAppRunning = false;  
       m_cancelTokenSource = null;  
       progressBar.Progress = 0.0;  

     }  
   }  
   else  
   {  
     m_cancelTokenSource.Cancel();  
   }  

   return;  

 }

//-----------------------------------------------------------------------------

if (DEBUG)

 public void alfaStarsSpatialMul()  
 {

endif

if (!DEBUG)

 public Task alfaStarsSpatialMul(CancellationToken ct)  
 {  
   return Task.Run(() =>  
   {

endif

     try  
     {  
       int cnt;  
       int starsQty = 0;  
       int i;  
       ulong loopsCnt = 0;  


       for(combs = 0; combs < combsCnt; combs++)  
       {

if (!DEBUG)

         progValue = (double)combs / (double)combsCnt;            
         MainThread.BeginInvokeOnMainThread(() => { progressBar.Progress = progValue; });

endif

         iPN = 1;  
         while (iPN < PN)  
         {  


             iPY = 0;  
             while(iPY < PY)//*** while(iPY < PY) Algorithm section ******************  
             {

if (!DEBUG)

               if (ct.IsCancellationRequested)  
               {     
                 stopwatch.Stop();  
                 strOutputTBText += $"\r\nCanceled at Loop {loopsCnt}";  
                 strOutputTBText += "\r\n";  
                 strOutputTBText += "Time elapsed:\r\n" + stopwatch.Elapsed;  
                 strOutputTBText += "\r\n";  

                 MainThread.BeginInvokeOnMainThread(() => {OutputTB.Text += strOutputTBText;});  

                 if (fromToCKB.IsChecked == false) IsFromToSetToZero = false;  
                 if(alphaCKB.IsChecked == false) IsAlphaMode = false;  

                 throw new OperationCanceledException(ct);  
               }

endif

             }// while(iPY < PY)  


         }// while (iPN < PN)  



       }//for(combs  


       strOutputTBText += $"\r\n {loopsCnt} Loops";  
       strOutputTBText += "\r\n";  

       stopwatch.Stop();  
       strOutputTBText += "Time elapsed:\r\n" + stopwatch.Elapsed;  
       strOutputTBText += "\r\n";  
       MainThread.BeginInvokeOnMainThread(() => {OutputTB.Text += strOutputTBText;});  
       NoSolution();  
     }  
     catch (Exception ex)  
     {  
       if(ex.ToString().Contains("OperationCanceledException"))  
       {  
         //  
       }  
       else  
       {  
         strOutputTBText += "\r\n\r\n";  
         strOutputTBText += $"Exception = " + ex + "\r\n";  
         strOutputTBText += $"Invalid Puzzle";  
         strOutputTBText += "\r\n\r\n";  
         MainThread.BeginInvokeOnMainThread(() => {OutputTB.Text += strOutputTBText;});  
       }  
     }  
     finally  
     {  
      if (fromToCKB.IsChecked == false) IsFromToSetToZero = false;  
      if(alphaCKB.IsChecked == false) IsAlphaMode = false;  
       progressBar.Progress = 0.0;  
     }

if (!DEBUG)

   }, ct);

endif

 }//alfaStarsSpatialMul()

Jack J Jun 25,296 Reputation points

2022-11-25T09:33:17.697+00:00

@Haviv Elbsz , Welcome to Microsoft Q&A, what problem did you meet when you debug the above code? Also, I recommend that you could look at the Microsoft blog How Do I Debug Async Code in Visual Studio?.
Haviv Elbsz 2,071 Reputation points

2022-11-25T10:00:26.56+00:00

Do I can do that
without learning.

because for regular apps
I started debug with the debug icons
step , step into, step over and so on

do for async/await is the same.

I was thinking that I need to know
how to setup for this.

Thank you very much

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Maui app async/await debugging issue

2 answers

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Your answer