c# - How could I use Func to modify a single condition of a lambda -

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I have a simple method containing a query to calculate some values.

  Personal Decimal MyQueryBuilderMethod ( MyThings of the list) {return myThings.Where (x => x.Id == 1). Selection (X = & gt ; (x.ThisValue * x.That)) .sum (); }   
 My intention is to modify this method that I have x Allow this value field to allow the object to be asked in the object.  
 If I specify where my query is, I might pass a predicate but in this case, I just want to change the value of x.ThisValue  
  Personal Decimal MyQueryBuilderMethod (Listings. ThingsViewModel & gt; MyThings; ThingsViewModel, bool & gt; predicates of the ceremony) Return my myths. Where (predicates) Select (x = & gt; (x.ThisValue * x.That). .Sum (); }   
 Ideally, I want to pass in something like: (things, x.ThisOtherValue)  
  MyQueryBuilderMethod   
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 should work:  
  Personal Decimal MyQueryBuilderMethod ( & Lt; ThingsViewModel & gt; MyThings for the list & lt; ThingsViewModel, Decimal & gt; (; x.Id == 1) .sum (X => (thisValue (x) * x.That X for the list = & gt;) thisValue) {myThings.Where to return; }   
 I also select  (...). Less (but) by equivalent  Sum (...) >.  
 Then you can call it like this:  
  var results = MyQueryBuilderMethod (My Things, T = & gt; T. this value);