Dynamically generated lambda giving different result than regular lambda

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LINQ

C#5.0

lambda

EF6.0

I am have a problem with Dynamically generated compared to a regular lambda expression in code. Below is the code that I use to generate a dynamic lambda.

Dynamic Lambda

var parameterExp = Expression.Parameter(typeof(T), "x");
var propertyExp = Expression.Property(parameterExp, propertyName);
MethodInfo method = typeof(string).GetMethod("Contains", new[] { typeof(string) });

var someValue = Expression.Constant(propertyValue, typeof(string));
var containsMethodExp = Expression.Call(propertyExp, method, someValue);

return Expression.Lambda<Func<T, bool>>(containsMethodExp, parameterExp);

Lambda from the debug view

{x => x.Name.Contains("UserName")}

But when I do the lambda in code like this

x => x.Name.Contains(formattedText);

I get this for a result. FormattedText is the variable used for regular lambda it = "UserName".

{x => x.Name.Contains(value(Test.BusinessLogicLayer.ClassBLL+<>x__DisplayClass8).formattedText)}

I use the lambda on the where clause on an Iqueryable object. The dynamic lambda generates the SQL in Iqueryable with no SQL parameters. The regular lambda causes the SQL to have parameters. I would need it to generate with parameters. We are looping through the parameters to change the like to a contains so we can use Full Text search in SQL server.

My questions is, is there a way to dynamically generate the lambda to have the exact same output as the regular lambda? Or is there a better way to use Full Text Search in Entity Framework 6?