/// <summary>
/// Copy settings from <paramref name="src"/>.
/// </summary>
/// <param name="src"></param>
/// <returns></returns>
public TempFileProviderOptions ReadFrom(TempFileProviderOptions src)
{
this.Directory = src.Directory;
this.Prefix = src.Prefix;
this.Suffix = src.Suffix;
return(this);
}
/// <summary>
/// Create temp file provider.
/// </summary>
/// <param name="options">(optional) options</param>
public TempFileProvider(TempFileProviderOptions options = null)
{
this.handleDisposedFunc = HandleDisposed;
if (options?.Directory == null && options?.Prefix == null && options?.Suffix == null)
{
// Use default function.
directory = Path.GetTempPath();
createTempFile = Path.GetTempFileName;
}
else
{
// Read dir
directory = options?.Directory;
if (directory == null)
{
// Get the default dir
directory = Path.GetTempPath();
}
else
{
// Expand environment variables
if (directory != null)
{
directory = Environment.ExpandEnvironmentVariables(directory);
}
// Expand tmp if the line above didn't do that
if (directory != null && directory.Contains("%tmp%"))
{
directory = directory.Replace("%tmp%", Path.GetTempPath());
}
// Test if there are still unwrapped environment variables.
if (directory != null)
{
Match environmentVariables = EnvironmentVariablePattern.Match(directory);
if (environmentVariables.Success)
{
throw new ArgumentException($"{nameof(TempFileProviderOptions)}: could not expand all environment variables \"{environmentVariables.Groups[1].Value}\".");
}
}
}
// Create function that creates files using GUIDs
prefix = options?.Prefix ?? "";
suffix = options?.Suffix ?? "";
createTempFile = () =>
{
for (int i = 0; i < 100; i++)
{
Guid guid = Guid.NewGuid();
string filename = Path.Combine(directory, prefix + guid.ToString() + suffix);
if (File.Exists(filename))
{
continue;
}
try
{
// Try create file
using (var fs = new FileStream(filename, FileMode.CreateNew)) { }
return(filename);
}
catch (IOException)
{
// File existed, or create failed
continue;
}
}
throw new IOException($"Failed to create temp file in {directory}");
};
}
}
