How to call asynchronous function in a synchronous function?

hamza hamidansari

I want data from async function to return as a list which will be assigned a list inside the synchronous function. I am calling an asynchronous function in an OnCreateView method of Fragment in xamarin android, which is returning a list. When async method go and fetch the data it goes into a wait mode. When it is waiting for data return it comes out of function and read below code lines of synchronous method where it is called. When async function is not able to a return list. It is causing empty list on my activity and showing no data.

I attached my my code rar file:

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Laxmidhar Sahoo8y ago
1. // The bellow method is asyn Method define
4. public async Task<string> GenerateCodeAsync()
5. {
6. string code = await GenerateCodeService.GenerateCodeAsync();
7. return code;
8. }
10. //Call this method in different ways in syn methood
12. string code = GenerateCodeAsync().Result;
15. //second calling type
17. private void button2_Click(object sender, EventArgs e)
18. {
20. label1.Text = "waiting....";
22. Task<string> sCode = Task.Run(async () =>
23. {
24. string msg =await GenerateCodeAsync();
25. return msg;
26. });
28. label1.Text += sCode.Result;
30. }

Sanwar Ranwa8y ago

You can check thesen Links

https://stackoverflow.com/questions/9343594/how-to-call-asynchronous-method-from-synchronous-method-in-c

https://stackoverflow.com/questions/22628087/calling-async-method-synchronously/22629216

http://sanjeev.dwivedi.net/?p=373

https://cpratt.co/async-tips-tricks/