/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>true if the enumerator was successfully advanced to the next element; false if
/// the enumerator has passed the end of the collection.</returns>
/// <exception cref="InvalidOperationException">The collection was modified after the enumerator was created.</exception>
public async Task <bool> MoveNextAsync()
{
List <object> Objects = null;
IElement E;
object[] Last = null;
int i, c = this.groupBy.Length;
object o1, o2;
while (this.processLast || await e.MoveNextAsync())
{
this.processLast = false;
if (this.objectVariables is null)
{
this.objectVariables = new ObjectProperties(e.Current, this.variables);
}
else
{
this.objectVariables.Object = e.Current;
}
if (Last is null)
{
Last = new object[c];
for (i = 0; i < c; i++)
{
E = this.groupBy[i].Evaluate(this.objectVariables);
Last[i] = E.AssociatedObjectValue;
}
}
else
{
for (i = 0; i < c; i++)
{
E = this.groupBy[i].Evaluate(this.objectVariables);
o1 = Last[i];
o2 = E.AssociatedObjectValue;
if (o1 is null ^ o2 is null)
{
break;
}
if (!(o1 is null) && !o1.Equals(o2))
{
break;
}
}
if (i < c)
{
this.processLast = true;
break;
}
}
if (Objects is null)
{
Objects = new List <object>();
}
Objects.Add(e.Current);
}
if (Objects is null)
{
return(false);
}
this.current = new GroupObject(Objects.ToArray(), Last, this.groupNames, this.variables);
return(true);
}
/// <summary>
/// <see cref="IEnumerator.Reset"/>
/// </summary>
public void Reset()
{
this.e.Reset();
this.processLast = false;
this.current = null;
}
