Closing a file after File.Create [duplicate]

This question already has answers here: File being used by another process after using File.Create() (11 answers) Closed 8 years ago.

I check to see if a file exists with

if(!File.Exists(myPath))
{
    File.Create(myPath);
}

However, when I go to create a StreamReader with this newly created file, I get an error saying that

The process cannot access the file '[my file path here]' because it is being used by another process.

There isn't a File.Close(myPath) that I can call so that it is closed after being created, so 开发者_如何学运维how do I free this resource so that I can open it later in my program?

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File.Create(string) returns an instance of the FileStream class. You can call the Stream.Close() method on this object in order to close it and release resources that it's using:

var myFile = File.Create(myPath);
myFile.Close();

However, since FileStream implements IDisposable, you can take advantage of the using statement (generally the preferred way of handling a situation like this). This will ensure that the stream is closed and disposed of properly when you're done with it:

using (var myFile = File.Create(myPath))
{
   // interact with myFile here, it will be disposed automatically
}

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The function returns a FileStream object. So you could use it's return value to open your StreamWriter or close it using the proper method of the object:

File.Create(myPath).Close();

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File.Create returns a FileStream object that you can call Close() on.

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The reason is because a FileStream is returned from your method to create a file. You should return the FileStream into a variable or call the close method directly from it after the File.Create.

It is a best practice to let the using block help you implement the IDispose pattern for a task like this. Perhaps what might work better would be:

if(!File.Exists(myPath)){
   using(FileStream fs = File.Create(myPath))
   using(StreamWriter writer = new StreamWriter(fs)){
      // do your work here
   }
}

---

File.WriteAllText(file,content)

create write close

File.WriteAllBytes--   type binary

:)