/// <summary>
/// Returns whether a database connection can be established using the specified database connection string thru the specified synchronization result.
/// </summary>
/// <param name="result">Synchronization result from invoked BeginTryConnect method</param>
/// <returns></returns>
public static bool EndTryConnect(IAsyncResult result)
{
bool _connected = false;
if (_delegatetable.ContainsKey(result))
{
InvokingDelegate _invoker = (InvokingDelegate)_delegatetable[result];
if (_invoker.InvokedThruConnectionString)
{
Func <string, bool> _delegate = (Func <string, bool>)_invoker.Invoker;
_connected = _delegate.EndInvoke(result);
try
{ _delegate = null; }
catch { }
}
else
{
Func <IDbConnection, bool> _delegate = (Func <IDbConnection, bool>)_invoker.Invoker;
_connected = _delegate.EndInvoke(result);
try
{ _delegate = null; }
catch { }
}
_delegatetable.Remove(result);
}
return(_connected);
}
/// <summary>
/// Returns a asynchronization of the CanConnect function. Result can then be returned by calling EndTryConnect after the asynchronization is completed.
/// </summary>
/// <param name="connectionstring">Database connection string.</param>
/// <returns></returns>
public static IAsyncResult BeginTryConnect(string connectionstring)
{
Func <string, bool> _delegate = new Func <string, bool>(CanConnect);
InvokingDelegate _invoker = new InvokingDelegate();
_invoker.InvokedThruConnectionString = true;
_invoker.Invoker = _delegate;
IAsyncResult _result = _delegate.BeginInvoke(connectionstring, null, _delegate);
_delegatetable.Add(_result, _invoker);
return(_result);
}
/// <summary>
/// Returns a asynchronization of the CanConnect function. Result can then be returned by calling EndTryConnect after the asynchronization is completed.
/// </summary>
/// <param name="connection">Database connection object.</param>
/// <returns>System.IAsyncResult generated from the CanConnect asynchronization.</returns>
public static IAsyncResult BeginTryConnect(IDbConnection connection)
{
Func<IDbConnection, bool> _delegate = new Func<IDbConnection, bool>(CanConnect);
InvokingDelegate _invoker = new InvokingDelegate();
_invoker.InvokedThruConnectionString = false;
_invoker.Invoker = _delegate;
IAsyncResult _result = _delegate.BeginInvoke(connection, null, _delegate);
_delegatetable.Add(_result, _invoker);
return _result;
}
