dotnet/runtime
在 GitHub 查看Unix: LastWriteTime doesn't return correct value when is updated too fast
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#55,951 创建于 2021年7月19日
area-System.IOhelp wantedneeds-further-triageos-linux
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描述
Description
static void Main(string[] args)
{
string fileName = Path.GetRandomFileName();
File.Create(fileName).Dispose();
Console.WriteLine("File created.");
Console.WriteLine($"LastWriteTime: {File.GetLastWriteTime(fileName):o}");
Console.WriteLine($"LastWriteTimeUtc: {File.GetLastWriteTimeUtc(fileName):o}");
File.WriteAllText(fileName, "v1.1");
Console.WriteLine();
Console.WriteLine("File updated 1.");
Console.WriteLine($"LastWriteTime: {File.GetLastWriteTime(fileName):o}");
Console.WriteLine($"LastWriteTimeUtc: {File.GetLastWriteTimeUtc(fileName):o}");
Console.WriteLine();
Console.WriteLine($"Current time: {DateTime.Now:o}");
Console.WriteLine($"Current time: {DateTime.UtcNow:o}");
File.WriteAllText(fileName, "v1.2");
Console.WriteLine();
Console.WriteLine("File updated 2.");
Console.WriteLine($"LastWriteTime: {File.GetLastWriteTime(fileName):o}");
Console.WriteLine($"LastWriteTimeUtc: {File.GetLastWriteTimeUtc(fileName):o}");
}
Prints:
File created.
LastWriteTime: 2021-07-19T11:33:14.5400000-07:00
LastWriteTimeUtc: 2021-07-19T18:33:14.5400000Z
File updated 1.
LastWriteTime: 2021-07-19T11:33:14.5600000-07:00
LastWriteTimeUtc: 2021-07-19T18:33:14.5600000Z
Current time: 2021-07-19T11:33:14.5767122-07:00
Current time: 2021-07-19T18:33:14.5767587Z
File updated 2.
LastWriteTime: 2021-07-19T11:33:14.5600000-07:00
LastWriteTimeUtc: 2021-07-19T18:33:14.5600000Z
Note how after the second File.WriteAllText the LastWriteTime is the same as the first and the DateTime.Now in between is larger.
I see this behavior on WSL2 Ubuntu, but it probably affects any Unix. This works correctly on Windows.
Regression?
No
Other information
Related issues: https://github.com/dotnet/runtime/issues/26964 https://github.com/dotnet/runtime/issues/18870