private static FileStreamStrategy ChooseStrategyCore(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options, long preallocationSize)
{
if (UseNet5CompatStrategy)
{
return(new Net5CompatFileStreamStrategy(path, mode, access, share, bufferSize == 0 ? 1 : bufferSize, options, preallocationSize));
}
WindowsFileStreamStrategy strategy = (options & FileOptions.Asynchronous) != 0
? new AsyncWindowsFileStreamStrategy(path, mode, access, share, options, preallocationSize)
: new SyncWindowsFileStreamStrategy(path, mode, access, share, options, preallocationSize);
return(EnableBufferingIfNeeded(strategy, bufferSize));
}
private static FileStreamStrategy ChooseStrategyCore(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options)
{
if (UseLegacyStrategy)
{
return(new LegacyFileStreamStrategy(path, mode, access, share, bufferSize, options));
}
WindowsFileStreamStrategy strategy = (options & FileOptions.Asynchronous) != 0
? new AsyncWindowsFileStreamStrategy(path, mode, access, share, options)
: new SyncWindowsFileStreamStrategy(path, mode, access, share, options);
return(EnableBufferingIfNeeded(strategy, bufferSize));
}
private static FileStreamStrategy ChooseStrategyCore(SafeFileHandle handle, FileAccess access, FileShare share, int bufferSize, bool isAsync)
{
if (UseLegacyStrategy)
{
return(new LegacyFileStreamStrategy(handle, access, bufferSize, isAsync));
}
WindowsFileStreamStrategy strategy = isAsync
? new AsyncWindowsFileStreamStrategy(handle, access, share)
: new SyncWindowsFileStreamStrategy(handle, access, share);
return(EnableBufferingIfNeeded(strategy, bufferSize));
}
private static FileStreamStrategy ChooseStrategyCore(SafeFileHandle handle, FileAccess access, FileShare share, int bufferSize, bool isAsync)
{
if (UseNet5CompatStrategy)
{
// The .NET 5 Compat strategy does not support bufferSize == 0.
// To minimize the risk of introducing bugs to it, we just pass 1 to disable the buffering.
return(new Net5CompatFileStreamStrategy(handle, access, bufferSize == 0 ? 1 : bufferSize, isAsync));
}
WindowsFileStreamStrategy strategy = isAsync
? new AsyncWindowsFileStreamStrategy(handle, access, share)
: new SyncWindowsFileStreamStrategy(handle, access, share);
return(EnableBufferingIfNeeded(strategy, bufferSize));
}
internal static FileStreamStrategy EnableBufferingIfNeeded(WindowsFileStreamStrategy strategy, int bufferSize) => bufferSize > 1 ? new BufferedFileStreamStrategy(strategy, bufferSize) : strategy;