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Extending FileInfo

Posted on 2004-04-23
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Last Modified: 2012-08-13
I'd like to add a Member to the FileInfo class, but FileInfo is sealed. I really don't know enough to write my own FileInfo-like class, what can I do?
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Question by:derekthornton
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9 Comments
 
LVL 4

Expert Comment

by:NTAC
ID: 10902775
it might be a pain, but make a class with a private instance of a FileInfo object.  Then you can add your methods, and just direct the fileinfo methods to the private instance.
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LVL 22

Expert Comment

by:_TAD_
ID: 10902961




well... here is the FileInfo Class signature:

But I think your best bet is to follow NTAC's advice.




// from module 'c:\windows\microsoft.net\framework\v1.1.4322\mscorlib.dll'
public sealed class System.IO.FileInfo :
    System.IO.FileSystemInfo,
    System.Runtime.Serialization.ISerializable
{

    // Fields

    // Constructors
    public FileInfo(string fileName);

    // Properties
    public FileAttributes Attributes { get; set; }
    public DateTime CreationTime { get; set; }
    public DateTime CreationTimeUtc { get; set; }
    public DirectoryInfo Directory { get; }
    public string DirectoryName { get; }
    public bool Exists { virtual get; }
    public string Extension { get; }
    public string FullName { virtual get; }
    public DateTime LastAccessTime { get; set; }
    public DateTime LastAccessTimeUtc { get; set; }
    public DateTime LastWriteTime { get; set; }
    public DateTime LastWriteTimeUtc { get; set; }
    public long Length { get; }
    public string Name { virtual get; }

    // Methods
    public System.IO.StreamWriter AppendText();
    public System.IO.FileInfo CopyTo(string destFileName);
    public System.IO.FileInfo CopyTo(string destFileName, bool overwrite);
    public System.IO.FileStream Create();
    public virtual System.Runtime.Remoting.ObjRef CreateObjRef(Type requestedType);
    public System.IO.StreamWriter CreateText();
    public virtual void Delete();
    public virtual bool Equals(object obj);
    public virtual int GetHashCode();
    public virtual object GetLifetimeService();
    public virtual void GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);
    public Type GetType();
    public virtual object InitializeLifetimeService();
    public void MoveTo(string destFileName);
    public System.IO.FileStream Open(System.IO.FileMode mode);
    public System.IO.FileStream Open(System.IO.FileMode mode, System.IO.FileAccess access);
    public System.IO.FileStream Open(System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share);
    public System.IO.FileStream OpenRead();
    public System.IO.StreamReader OpenText();
    public System.IO.FileStream OpenWrite();
    public void Refresh();
    public virtual string ToString();
} // end of System.IO.FileInfo
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Accepted Solution

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rama_krishna580 earned 2000 total points
ID: 10905679
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LVL 2

Author Comment

by:derekthornton
ID: 10986799
Sorry I took so long to get back to you!
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Expert Comment

by:NTAC
ID: 11009287
????
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Author Comment

by:derekthornton
ID: 11009347
What?
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LVL 4

Expert Comment

by:NTAC
ID: 11009430
What did he post?  All he posted was a link to docuemtation that comes with .net...
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Author Comment

by:derekthornton
ID: 11009450
.... That was the entire FileInfo Source Code.
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Author Comment

by:derekthornton
ID: 11009456
.... That was the entire FileInfo Source Code.
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