private static Func <IDataReader, object> GetDynamicDeserializer(IDataRecord reader, int startBound, int length, bool returnNullIfFirstMissing)
{
var fieldCount = reader.FieldCount;
if (length == -1)
{
length = fieldCount - startBound;
}
if (fieldCount <= startBound)
{
throw new ArgumentException("fieldCount <= startBound", "splitOn");
}
return
(r =>
{
IDictionary <string, object> row = new Dictionary <string, object>(length);
for (var i = startBound; i < startBound + length; i++)
{
var tmp = r.GetValue(i);
tmp = tmp == DBNull.Value ? null : tmp;
row[r.GetName(i)] = tmp;
if (returnNullIfFirstMissing && i == startBound && tmp == null)
{
return null;
}
}
return FastExpando.Attach(row);
});
}
private static Func <IDataReader, T> GetDynamicDeserializer <T>(IDataRecord reader, int startBound = 0, int length = -1, bool returnNullIfFirstMissing = false)
{
if (length == -1)
{
length = reader.FieldCount - startBound;
}
return
(r =>
{
IDictionary <string, object> row = new Dictionary <string, object>(length);
for (var i = startBound; i < startBound + length; i++)
{
var tmp = r.GetValue(i);
tmp = tmp == DBNull.Value ? null : tmp;
row[r.GetName(i)] = tmp;
if (returnNullIfFirstMissing && i == startBound && tmp == null)
{
return default(T);
}
}
//we know this is an object so it will not box
return (T)(object)FastExpando.Attach(row);
});
}
public static Func <IDataReader, object> GetDynamicDeserializer(IDataRecord reader, int startBound, int length, bool returnNullIfFirstMissing)
{
var fieldCount = reader.FieldCount;
if (length == -1)
{
length = fieldCount - startBound;
}
if (fieldCount <= startBound)
{
throw new ArgumentException("When using the multi-mapping APIs ensure you set the splitOn param if you have keys other than Id", "splitOn");
}
return
(r =>
{
IDictionary <string, object> row = new Dictionary <string, object>(length);
for (var i = startBound; i < startBound + length; i++)
{
var tmp = r.GetValue(i);
tmp = tmp == DBNull.Value ? null : tmp;
row[r.GetName(i)] = tmp;
if (returnNullIfFirstMissing && i == startBound && tmp == null)
{
return null;
}
}
//we know this is an object so it will not box
return FastExpando.Attach(row);
});
}
