CODEWITHSUNDEEP
c#wpfexceptionfile-writing
mechbaral
mechbaral

Reputation: 133

Exception while saving data into a txt file

I am trying to write the data to a file, and the data is continuously updated every 100ms. So when I click save button then

System.InvalidOperationException: Collection was modified enumeration operation may not execute.

error comes up. Upon my search there is solutions to this probelm if there is Foreach loop but in my case there is no Foreach loop.

Bellow is the code I used

File.WriteAllLines(fileDialog.FileName, 
    RawDataFromSerialPort.Select((v, i) => $"{i + 1} Raw data is -->, {v.ToString()}"));

enter image description here

Upvotes: 0

Views: 323

Answers (3)

mechbaral
mechbaral

Reputation: 133

The problem was that the List name I was accessing was wrong so correcting the list name RawDataFromSerialPort made my problem solved

Upvotes: 0

Peter
Peter

Reputation: 83

Check the stacktrace as well, there you'll find the drill down of the call stack where eventually a foreach-(like)loop is used.

Click on the 'view details' link, expand the $exception node and look for the StackTrace field.

Upvotes: 1

PhilH
PhilH

Reputation: 80

I'd say your serial port is still receiving data on a background thread whilst you're trying to read from the raw data collection, I'd suggest making a copy of the collection and then writing the copy out to the file.

Try using the syncroot property on the collection while doing the copy.

https://learn.microsoft.com/en-us/dotnet/api/system.array.syncroot?view=netframework-4.7.2

Upvotes: 1

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