asked on

Extending FileInfo

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?

NTAC

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.

_TAD_

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

ASKER CERTIFIED SOLUTION