How can I create a temp file with a specific extension with .NET?

Question

I need to generate a unique temporary file with a .csv extension.

What I do right now is

string filename = System.IO.Path.GetTempFileName().Replace(         


        

Answer 1

I mixed @Maxence and @Mitch Wheat answers keeping in mind I want the semantic of GetTempFileName method (the fileName is the name of a new file created) adding the extension preferred.

string GetNewTempFile(string extension)
{
    if (!extension.StartWith(".")) extension="." + extension;
    string fileName;
    bool bCollisions = false;
    do {
        fileName = Path.Combine(System.IO.Path.GetTempPath(), Guid.NewGuid().ToString() + extension);
        try
        {
            using (new FileStream(fileName, FileMode.CreateNew)) { }
            bCollisions = false;
        }
        catch (IOException)
        {
            bCollisions = true;
        }
    }
    while (bCollisions);
    return fileName;
}