Read file right after it was created and closed [duplicate]

Question

After creating a file via File.Create, I want to read it afterwards with File.ReadAllText. However, I always get an exception that says that the process cannot access the file. Once the file is created, access works without problems. So I assume that the file is not yet released by File.Create at the time where it should be read. How do I solve this? Below is my method.

 public SettingsModel LoadSettings() { var _fullPath = FileHelper.GetFullPath(_fileName); if (!File.Exists(_fullPath)) { File.Create(_fullPath).Close(); } var serializedSettings = File.ReadAllText(_fullPath); var settings = JsonConvert.DeserializeObject<SettingsModel>(serializedSettings); if (settings == null) { return new SettingsModel(); } else { return settings; } }

Try using the using clause pattern for IDisposable to be sure to free up Windows resources and handle, thus any own lock. — user12031933
– user12031933, Commented Aug 7, 2021 at 10:21
Does this answer your question? File being used by another process after using File.Create() and Release resources in .Net C# — user12031933
– user12031933, Commented Aug 7, 2021 at 10:23
@OlivierRogier Same issue with using(StreamWriter sw = new StreamWriter(_fullPath, true)) { } — patrickgc
– patrickgc, Commented Aug 7, 2021 at 10:34
Lockhunter says that the file is blocked by its own application. — patrickgc
– patrickgc, Commented Aug 7, 2021 at 11:06
I must apologize, the mistake was between the ears. In the method GetFullPath, I already check if the file exists and create it if necessary. I still thank everyone for the support. — patrickgc
– patrickgc, Commented Aug 7, 2021 at 11:16

Michael · Accepted Answer · 2021-08-07 10:37:31Z

0

You create an empty file to deserialize it afterwards. You can perform deserialization only if the file exists:

public SettingsModel LoadSettings() { var _fullPath = FileHelper.GetFullPath(_fileName); var settings = File.Exists(_fullPath) ? JsonConvert.DeserializeObject<SettingsModel>(File.ReadAllText(_fullPath)) : new SettingsModel(); return settings; }

answered Aug 7, 2021 at 10:37

Michael

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6 Comments

Steeeve Over a year ago

While this is ok, the real problem is, that you can't read from a file immediatly after creation (However, I always get an exception that says that the process cannot access the file)

Michael Over a year ago

File.Create returns an (open) stream, so you have to close the returned Stream before reading: using (var fs = File.Create("myFile.txt")) { } var content = File.ReadAllText("myFile.txt");

Steeeve Over a year ago

File.Create(...).Close() also closes the file. I would also put that in a using block instead, but in this case, the file can't be left open. If File.Create fails, there is no stream to close.

patrickgc Over a year ago

Unfortunately, this does not solve my problem either.

patrickgc Over a year ago

I must apologize, the mistake was between the ears. In the method GetFullPath, I already check if the file exists and create it if necessary. I still thank everyone for the support.

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