How to show progress when use richtextbox loadfile or other methods

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there's a richtextbox compenent,I want to show the progress of the load file.
i tried other method such as:
1. File.ReadAllText
2. StreamReader.ReadToEnd
3. StreamReader.ReadLine
4. richtextbox.LoadFile
but it cann't show progress.
And, obviously, I test the loading time, one line of reading the file data is the slowest method, I have to take into account the speed of loading.
how to achieve my purpuse,tks for answer.

remark:it's c# winform application

What I have tried:

create a thread,and calculate richtextbox.text.leng/FileInfo(filepathe).Length.
but i cann't show progress

Posted 21-Sep-16 20:33pm

xuyunhai20160827

Updated 21-Sep-16 22:33pm

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Richard MacCutchan · Answer 1 · 2016-09-21T22:33:00

Solution 1

Use a ProgressBar Class (System.Windows.Forms)[^].

Posted 21-Sep-16 22:33pm

Richard MacCutchan

Comments

xuyunhai20160827 22-Sep-16 5:14am

i'm not mean like this.
progressbar is compenent to show,but i need calculate richtextbox.text.leng/FileInfo(filepathe).Length,and give the result to progreesbar.value.
but how to calculate the result when use the method as above?

Richard MacCutchan 22-Sep-16 5:36am

What do you mean "how to calculate"? That is basic mathematics.

xuyunhai20160827 22-Sep-16 5:57am

for example,when you use richtextbox.LoadFile,how to show the progress of the load file?
where is the progress value?

you can try,and then reply to me,not just reply without try.

Richard MacCutchan 22-Sep-16 6:35am

There is no progress information from the LoadFile. You would need to load the file manually and check progress in your code. However it would need to be an extremely large file to make this worthwhile.