private void HandleOrderByExpression(ReadOnlyCollection <Expression> arguments, SortDirectionConstants sortDir)
{
if (arguments.Count == 2)
{
var unaryExpr = arguments[1] as UnaryExpression;
if (unaryExpr != null)
{
var fieldSort = new FieldSort();
fieldSort.Name = ExpressionHelper.GetMemberName(unaryExpr.Operand);
fieldSort.SortDirection = sortDir;
//Do not throw errow for now, just week it out
//if (this.Query.FieldSorts.FindIndex(x => x.Name == fieldSort.Name) >= 0)
// throw new InvalidOperationException($"Duplicate sort field \"{fieldSort.Name}\" was encountered.");
//Only add if not exists
if (this.Query.FieldSorts.FindIndex(x => x.Name == fieldSort.Name) == -1)
{
this.Query.FieldSorts.Add(fieldSort);
}
return; // Success
}
var constantExpr = arguments[1] as ConstantExpression;
if (constantExpr != null)
{
var fieldSort = new FieldSort();
fieldSort.Name = (string)constantExpr.Value;
fieldSort.SortDirection = sortDir;
this.Query.FieldSorts.RemoveAll(x => x.Name == fieldSort.Name);
this.Query.FieldSorts.Add(fieldSort);
return; // Success
}
throw new InvalidOperationException("Invalid OrderBy expression arguments.");
}
}
public static string ToSqlDirection(this SortDirectionConstants sort)
{
return(sort == SortDirectionConstants.Desc ? "DESC" : "ASC");
}