/// <summary>
/// If there is a directory or file at the specified path, returns true.
/// Otherwise, returns false.
/// Does not throw IO exceptions, to match Directory.Exists and File.Exists.
/// Unlike calling each of those in turn it only accesses the disk once, which is faster.
/// </summary>
internal static bool FileOrDirectoryExistsNoThrow(string fullPath)
{
fullPath = AttemptToShortenPath(fullPath);
if (NativeMethodsShared.IsWindows)
{
#if !CLR2COMPATIBILITY
if (Traits.Instance.CacheFileExistence)
{
// Possible future improvement: make sure file existence caching happens only at evaluation time, and maybe only within a build session. https://github.com/Microsoft/msbuild/issues/2306
return(FileExistenceCache.GetOrAdd(fullPath, NativeMethodsShared.FileExists));
}
else
{
#endif
return(NativeMethodsShared.FileExists(fullPath));
#if !CLR2COMPATIBILITY
}
#endif
}
else
{
try
{
return(File.Exists(fullPath) || Directory.Exists(fullPath));
}
catch
{
return(false);
}
}
}
/// <summary>
/// Returns if the directory exists
/// </summary>
/// <param name="fullPath">Full path to the file in the filesystem</param>
/// <returns></returns>
internal static bool FileExistsNoThrow(string fullPath
#if !CLR2COMPATIBILITY
, IFileSystem fileSystem = null
#endif
)
{
fullPath = AttemptToShortenPath(fullPath);
try
{
#if CLR2COMPATIBILITY
return(NativeMethodsShared.FileExists(fullPath));
#else
fileSystem = fileSystem ?? DefaultFileSystem;
return(Traits.Instance.CacheFileExistence
? FileExistenceCache.GetOrAdd(fullPath, fileSystem.FileExists)
: fileSystem.FileExists(fullPath));
#endif
}
catch
{
return(false);
}
}