internal static MediaDataReader <MediaInfo> SelectMedia <T>(ForeachFunc <T> func, T param,
SelectArguments arguments)
{
using (var filter = QueryArguments.ToNativeHandle(arguments))
{
var items = new List <MediaInfo>();
Exception exception = null;
func(param, filter, (mediaInfoHandle, _) =>
{
try
{
items.Add(MediaInfo.FromHandle(mediaInfoHandle));
return(true);
}
catch (Exception e)
{
exception = e;
return(false);
}
}).ThrowIfError("Failed to query");
if (exception != null)
{
throw exception;
}
return(new MediaDataReader <MediaInfo>(items));
}
}
internal static MediaDataReader <TRecord> Select <TRecord>(SelectArguments arguments,
ForeachFunc foreachFunc,
Func <IntPtr, TRecord> factoryFunc)
{
using (var filter = QueryArguments.ToNativeHandle(arguments))
{
Exception caught = null;
var items = new List <TRecord>();
foreachFunc(filter, (itemHandle, _) =>
{
try
{
items.Add(factoryFunc(itemHandle));
return(true);
}
catch (Exception e)
{
caught = e;
return(false);
}
}).ThrowIfError("Failed to execute query");
if (caught != null)
{
throw caught;
}
return(new MediaDataReader <TRecord>(items));
}
}
internal static IntPtr SelectScalar(ForeachFunc foreachFunc, string filterExpression,
CloneFunc cloneFunc)
{
using (var filter = QueryArguments.CreateNativeHandle(filterExpression))
{
IntPtr handle = IntPtr.Zero;
foreachFunc(filter, (itemHandle, _) =>
{
cloneFunc(out handle, itemHandle);
return(false);
}).ThrowIfError("Failed to execute query");
return(handle);
}
}
private void Foreach(ForeachFunc func)
{
}
