Declaring an implicitly typed variable inside conditional scope and using it outside

Question

In the simplified code below,

if(city == \"New York City\")
{
  var MyObject = from x in MyEFTable
                     where x.CostOfLiving == \"VERY HIGH\         


        

Answer 1

If you're using a named type, just declare a variable with that type before the if, but then the question would be trivial.

So I assume you're selecting an anonymous type, so you can't explicitly declare a variable with that type.

Cast by example would work here. But that doesn't feel like a good solution. Probably creating a named type is a better idea.

var myObject =Enumerable.Empty.Select(row=>select new {columnA, columnB, columnC});
if(city == "New York City")
{
  myObject= from x in MyEFTable
                     where x.CostOfLiving == "VERY HIGH"
                     select select new {columnA, columnB, columnC};
}
else
{
  myObject = from x in MyEFTable
                     where x.CostOfLiving == "MODERATE"
                     select select new {columnA, columnB, columnC};
}

Or in your specific example one could project only after the conditional:

IQueryable partialQuery;
if(city == "New York City")
    partialQuery=MyEFTable.Where(x=>x.x.CostOfLiving == "VERY HIGH");
else
    partialQuery=MyEFTable.Where(x=>x.x.CostOfLiving == "MODERATE");
var myObject=partialQuery.Select(x=>x.new {columnA, columnB, columnC});

Or:

Expression> filter;//Note that this is an Expression, not just a delegate
if(city == "New York City")
  filter=x=>x.x.CostOfLiving == "VERY HIGH";
else
  filter=x=>x.x.CostOfLiving == "MODERATE";
var myObject=MyEFTable.Where(filter).Select(x=>x.new {columnA, columnB, columnC});

Or even just:

string s;
if(city == "New York City")
  s="VERY HIGH";
else
  s="MODERATE";
var myObject=MyEFTable.Where(x=>x.CostOfLiving == s).Select(x=>x.new {columnA, columnB, columnC});

Which one is appropriate depends on how you simplified your question.