Calling FbServerProperties.GetDatabasesInfo() generates a NullReference
exception
---------------------------------------------------------------------------------
Key: DNET-641
URL: http://tracker.firebirdsql.org/browse/DNET-641
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 4.8.1.0
Environment: Windows 10 Professional 64-bit; .NET 4.6; VS 2015
Reporter: Peter Taylor
Assignee: Jiri Cincura
Priority: Blocker
The uninitialsied List<string> _databases member is used by
FbDatabasesInfo.AddDatabase(string database) method [ _databases.Add(database)]
_databases IS initialised by a call to FbDatabasesInfo.Databases property - but
that is too late.
Here is the offending code ( I can send a simple sample project demonstrating
the issue, if required):
/* This is the code where it goes wrong:
NETProvider\src\FirebirdSql.Data.FirebirdClient\Services\FbDatabasesInfo.cs
using System;
using System.Collections.Generic;
namespace FirebirdSql.Data.Services
{
public class FbDatabasesInfo
{
public int ConnectionCount { get; internal set; }
// this member is used before being initialised
private List<string> _databases; // = new List<string>();
#if (NET_40)
public IList<string> Databases
#else
public IReadOnlyList<string> Databases
#endif
{
get
{
return (_databases ?? (_databases = new
List<string>())).AsReadOnly();
}
}
internal FbDatabasesInfo()
{ }
internal void AddDatabase(string database)
{
// this is where the uninitialised member is used, when
FbServerProperties.GetDatabasesInfo() is called
_databases.Add(database);
}
}
}
*/
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