dotnet 6.0 C# - 访问路径被拒绝

Question

当我尝试在我的主目录中打开一个文件时收到 UnauthorizedAccessException，该文件最初是使用下面显示的代码创建的。

该程序的初始运行将在我的主目录中创建空文件“file.txt”而不会出现问题，无论选择了 File.Open 选项（只读或写入）。当文件已经存在并且我选择只读选项时，代码也会运行。

我已经检查了文件权限，并且我对文件和目录具有完全的读/写权限。我的用户被列为文件的所有者。我尝试了不同的目录 (C:\) 并得到相同的错误。

该程序是使用最新版本的 VS Code 和 .Net 编译器 4.0.0-6.21526.21 用 C#10.0 编写的。

错误文本：

Press R for read-only or W for writeable: w
System.UnauthorizedAccessException says Access to the path 'C:\Users\johnc\Documents\Repositories\dotnet\C#10andDotNet6Book\Chapter03\file.txt' is denied.
System.UnauthorizedAccessException says
System.UnauthorizedAccessException says System.Private.CoreLib
System.UnauthorizedAccessException says    at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize)
   at System.IO.Strategies.FileStreamHelpers.ChooseStrategyCore(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize)
   at System.IO.Strategies.FileStreamHelpers.ChooseStrategy(FileStream fileStream, String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, Int64 preallocationSize)
   at System.IO.File.Open(String path, FileMode mode, FileAccess access)
   at Program.<Main>$(String[] args) in C:\Users\johnc\Documents\Repositories\dotnet\C#10andDotNet6Book\Chapter03\SelectionStatements\Program.cs:line 19
System.UnauthorizedAccessException says Microsoft.Win32.SafeHandles.SafeFileHandle CreateFile(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, System.IO.FileOptions)

dotnet --info:

.NET SDK (reflecting any global.json):
 Version:   6.0.100
 Commit:    9e8b04bbff

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19042
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\6.0.100\

Host (useful for support):
  Version: 6.0.0
  Commit:  4822e3c3aa
.NET SDKs installed:
  3.1.415 [C:\Program Files\dotnet\sdk]
  5.0.403 [C:\Program Files\dotnet\sdk]
  6.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

全局使用：

// <auto-generated/>
global using global::System;
global using global::System.Collections.Generic;
global using global::System.IO;
global using global::System.Linq;
global using global::System.Net.Http;
global using global::System.Threading;
global using global::System.Threading.Tasks;

代码：

using static System.Console;

string path = $@"{Environment.GetFolderPath(Environment.SpecialFolder.Personal)}\Repositories\dotnet\C#10andDotNet6Book\Chapter03";

Write("Press R for read-only or W for writeable: ");
ConsoleKeyInfo key = ReadKey();
WriteLine();

Stream? s;

try
{
    if (key.Key == ConsoleKey.R)
    {
        s = File.Open(Path.Combine(path, "file.txt"), FileMode.OpenOrCreate, FileAccess.Read);
    }
    else
    {
        s = File.Open(Path.Combine(path, "file.txt"), FileMode.OpenOrCreate, FileAccess.Write);
    }

    string message;

    switch (s)
    {
        case FileStream writeableFile when s.CanWrite:
            message = "The stream is a file that I can write to.";
            break;
        case FileStream readOnlyFile:
            message = "The stream is a read-only file.";
            break;
        case MemoryStream ms:
            message = "The stream is a memory address.";
            break;
        default:
            message = "The stream is some other type.";
            break;
        case null:
            message = "The stream is null.";
            break;
    }

    WriteLine(message);
}
catch (Exception ex)
{
    WriteLine($"{ex.GetType()} says {ex.Message}");
    WriteLine($"{ex.GetType()} says {ex.HelpLink}");
    WriteLine($"{ex.GetType()} says {ex.Source}");
    WriteLine($"{ex.GetType()} says {ex.StackTrace}");
    WriteLine($"{ex.GetType()} says {ex.TargetSite}");
}

Answer 1

解决了！！！

Avast Antivirus File Shield 阻止了文件访问。一旦我通过病毒检查器允许了 .exe 权限，我的代码就会按预期工作。

哇，在电脑上度过了艰难的一天。是时候休息一下了！！