Hi liubin,
你可以尝试用winapi来准确的检测异常是否文件被占用。
下面是具体的代码。
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern SafeFileHandle CreateFile(string lpFileName,
FileSystemRights dwDesiredAccess, FileShare dwShareMode, IntPtr
securityAttrs, FileMode dwCreationDisposition, FileOptions
dwFlagsAndAttributes, IntPtr hTemplateFile);
const int ERROR_SHARING_VIOLATION = 32;
static void Main(string[] args)
{
FileStream file = null;
FileStream file1 = null;
string fileName = "D:\\Data.txt";
try
{
file = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite); //file is opened
//you use the file here
file1 = new FileStream(fileName, FileMode.Open, FileAccess.Read);
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
SafeFileHandle fileHandle =
CreateFile(fileName, FileSystemRights.Modify,
FileShare.Write, IntPtr.Zero,
FileMode.OpenOrCreate, FileOptions.None, IntPtr.Zero);
if (fileHandle.IsInvalid)
{
if (Marshal.GetLastWin32Error() ==ERROR_SHARING_VIOLATION)
{
Console.WriteLine("File is in use");
}
}
fileHandle.Close();
}
根据下面的链接，你可以找到当数字为32时，对应的异常是‘The process cannot access the file because it is being used by another process.’.
System Error Codes (0-499)
希望对你有所帮助。
Best Regards,
Jack
MSDN Community Support
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