private void VisitSelectStatements(List <MethodCallExpression> callChain, Type typeResult, IEnumerable <string> otherVariables)
{
string[] names = new[] { nameof(q.Select) };
List <MethodCallExpression> tmp = callChain.Where(p => names.Contains(p.Method.Name)).ToList();
SelectQueryTranslator s = new SelectQueryTranslator(typeResult, otherVariables);
foreach (MethodCallExpression item in tmp)
{
s.Accept(item);
callChain.Remove(item);
}
SelectPart = s.Statement;
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
var name = node.Method.Name;
LambdaExpression lambdaExpression;
switch (name)
{
case "Where":
lambdaExpression = GetLambdaExpression(node);
var whereTranslator = new WhereQueryTranslator();
WhereClause = whereTranslator.Translate(lambdaExpression);
Visit(node.Arguments[0]);
break;
case "FirstOrDefault":
FirstOrDefaultClause = "TOP 1 *";
Visit(node.Arguments[0]);
break;
case "ThenBy":
case "OrderBy":
case "OrderByDescending":
case "ThenByDescending":
var sortingType = name.Contains("Descending") ? SortingType.DESC : SortingType.ASC;
lambdaExpression = GetLambdaExpression(node);
var orderByTranslator = new OrderByQueryTranslator(sortingType);
orderByClauses_.Add(orderByTranslator.Translate(lambdaExpression));
Visit(node.Arguments[0]);
break;
case "Select":
lambdaExpression = GetLambdaExpression(node);
var selectTranslator = new SelectQueryTranslator();
SelectClause = selectTranslator.Translate(lambdaExpression);
Visit(node.Arguments[0]);
break;
default:
break;
}
return(node);
}
