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Narrowing an expression to use a delegate with fewer args

/ Published in: C#
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  1. var valueFromSomewhere = "BAR";
  2.  
  3. Expression<Func<Controller, string, object>> expressionWithArg = (c, s) => c.Action("foo", s);
  4.  
  5. var methodCallExpression = (MethodCallExpression)expressionWithArg.Body;
  6.  
  7. var expressionWithoutArg = Expression.Lambda<Func<Controller, object>>(
  8.     Expression.Call(methodCallExpression.Object, methodCallExpression.Method, methodCallExpression.Arguments[0], Expression.Constant(valueFromSomewhere)),
  9.     expressionWithArg.Parameters[0]
  10.     );

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