/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
public static Exception GetBetterException(Exception e, AccessConnectionHolder holder)
{
try {
if (!(e is OleDbException) || holder.Connection == null ||
holder.Connection.DataSource == null || holder.Connection.DataSource.Length < 1)
{
return(e);
}
if (!File.Exists(holder.Connection.DataSource))
{
return(new FileNotFoundException(String.Empty, holder.Connection.DataSource, e));
}
}
finally {
if (holder.Connection != null)
{
holder.Connection.Close();
}
}
FileStream s = null;
Exception eWrite = null;
try {
s = File.OpenWrite(holder.Connection.DataSource);
}
catch (Exception except) {
eWrite = except;
}
finally {
if (s != null)
{
s.Close();
}
}
if (eWrite != null && (eWrite is UnauthorizedAccessException))
{
HttpContext context = HttpContext.Current;
if (context != null)
{
context.Response.Clear();
context.Response.StatusCode = 500;
context.Response.Write("Cannot write to DB File");
context.Response.End();
}
return(new Exception("AccessFile is not writtable", eWrite));
}
return(e);
}
///<summary>构造函数
///</summary>
///<param name="filename">形如~/的地址</param>
public OleDbDataOpener(string filename)
{
holder = AccessConnectionHolder.GetConnection(filename, true);
_Connection = holder.Connection;
_Command = new OleDbCommand();
}
