protected string GetSourceVarName(MemberExpression expression)
{
string sourceVarName = null;
if (expression.Expression is QuerySourceReferenceExpression)
{
var querySource = expression.Expression as QuerySourceReferenceExpression;
Expression mappedExpression;
if (QueryBuilder.TryGetQuerySourceMapping(querySource.ReferencedQuerySource, out mappedExpression) &&
mappedExpression is SelectVariableNameExpression)
{
sourceVarName = (mappedExpression as SelectVariableNameExpression).Name;
}
else
{
sourceVarName = querySource.ReferencedQuerySource.ItemName;
QueryBuilder.AddQuerySourceMapping(
querySource.ReferencedQuerySource,
new SelectVariableNameExpression(querySource.ReferencedQuerySource.ItemName, VariableBindingType.Resource, querySource.ReferencedQuerySource.ItemType));
}
}
else if (expression.Expression is MemberExpression)
{
var memberExpression = VisitExpression(expression.Expression);
if (memberExpression is SelectVariableNameExpression)
{
sourceVarName = (memberExpression as SelectVariableNameExpression).Name;
}
}
return(sourceVarName);
}
