list of t has 0 element after exit file

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65010773 asked May 17, '20 yanxiaodi answered May 22, '20

list of t has 0 element after exit file

Hi

I read a textfile and make some processing and get data in listtime when i check the listtime in the scope of the sub where i do processing ,listtime has N element but after exit the sub it has no element ?

  ![8220-im1.png][1]

here the watch of the debugger

[1]: /answers/storage/attachments/8220-im1.png

Thanks

windows-uwp

im1.png (7.1 KiB)

im2.png (115.0 KiB)

watch1.png (68.0 KiB)

watch2.png (41.0 KiB)

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PeterFleischer-3316 · May 17, 2020 at 08:37 PM

Hi, if you use await the execution of method ends before all instructions are executed. Use NotifiPropertyChanged to inform about the end of method.

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RoyLi-MSFT · May 19, 2020 at 03:12 AM

Have you solved your issue? Does anonymous user-3316 's answer work on your side?

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Answer 1 · 2020-05-19T18:28:10.683Z

65010773 answered May 19, '20 PeterFleischer-3316 commented May 19, '20

Hi

I don't succeed to achieve my goal

im1.png (47.0 KiB)

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PeterFleischer-3316 · May 19, 2020 at 08:16 PM

Hi, my code demonstrates that task run in separat thread and you cannot get the expected result. You can start readFile and process the end of the asynchronous work in a separate event routine.

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Answer 2 · 2020-05-18T03:53:18.713Z

PeterFleischer-3316 answered May 18, '20 PeterFleischer-3316 edited May 20, '20

Hi, if you use await the execution of method ends before all instructions are executed. Try following code and check debug result in "Immediate Window". Use NotifyPropertyChanged to inform about the end of method.

Another approach is to use LoadList as function:

x.png (38.4 KiB)

x2.png (49.0 KiB)

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Answer 3 · 2020-05-22T22:36:39.64Z

yanxiaodi answered May 22, '20

You need to use await for your async method. eg. await read-file()

You also need to change MainPage_Loading() to an async method. If you don't use await for read-file(), you will hit the end of MainPage_Loading() before read-file() returns its result.

Sorry because I cannot post "readfile" here so please use your method name to replace it.

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