FileInfo.MoveTo()vs File.Move()

Question

这两种移动文件的方法有什么区别吗？

System.IO.FileInfo f = new System.IO.FileInfo(@"c:\foo.txt");
f.MoveTo(@"c:\bar.txt");

//vs

System.IO.File.Move(@"c:\foo.txt", @"c:\bar.txt");

Answer 1

请查看此MSDN页面中的"备注"部分http://msdn.microsoft.com/en-us/library/akth6b1k.aspx:

如果要多次重用对象,请考虑使用FileInfo的实例方法而不是File类的相应静态方法,因为并不总是需要进行安全检查.

我认为这种差异在文件(目录)和FileInfo(DirectoryInfo)类之间最为重要.

UPD:类似问题中的相同解释/sf/answers/92736591/

Answer 2

通过RedGate Reflector:

File.Move()

public static void Move(string sourceFileName, string destFileName)
{
    if ((sourceFileName == null) || (destFileName == null))
    {
        throw new ArgumentNullException((sourceFileName == null) ? "sourceFileName" : "destFileName", Environment.GetResourceString("ArgumentNull_FileName"));
    }
    if ((sourceFileName.Length == 0) || (destFileName.Length == 0))
    {
        throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), (sourceFileName.Length == 0) ? "sourceFileName" : "destFileName");
    }
    string fullPathInternal = Path.GetFullPathInternal(sourceFileName);
    new FileIOPermission(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, new string[] { fullPathInternal }, false, false).Demand();
    string dst = Path.GetFullPathInternal(destFileName);
    new FileIOPermission(FileIOPermissionAccess.Write, new string[] { dst }, false, false).Demand();
    if (!InternalExists(fullPathInternal))
    {
        __Error.WinIOError(2, fullPathInternal);
    }
    if (!Win32Native.MoveFile(fullPathInternal, dst))
    {
        __Error.WinIOError();
    }
}

和FileInfo.MoveTo()

public void MoveTo(string destFileName)
{
    if (destFileName == null)
    {
        throw new ArgumentNullException("destFileName");
    }
    if (destFileName.Length == 0)
    {
        throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), "destFileName");
    }
    new FileIOPermission(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, new string[] { base.FullPath }, false, false).Demand();
    string fullPathInternal = Path.GetFullPathInternal(destFileName);
    new FileIOPermission(FileIOPermissionAccess.Write, new string[] { fullPathInternal }, false, false).Demand();
    if (!Win32Native.MoveFile(base.FullPath, fullPathInternal))
    {
        __Error.WinIOError();
    }
    base.FullPath = fullPathInternal;
    base.OriginalPath = destFileName;
    this._name = Path.GetFileName(fullPathInternal);
    base._dataInitialised = -1;
}

Answer 3

一个重要的区别是FileInfo.MoveTo()会将FileInfo对象的文件路径更新为目标路径.这显然不是File.Move()的情况,因为它只使用字符串作为输入.