string compare greater than expression predicate

Asked Aug 07 '18 at 15:50

Active Aug 07 '18 at 15:50

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i am creating a method that generates predicate to filter out items from list.

        MemberExpression member = Expression.Property(param, filter.ColumnName);
        ConstantExpression constant = Expression.Constant(filter.Text);

for contains

 private static MethodInfo containsMethod = typeof(string).GetMethod("Contains"); 
 Expression.Call(member , containsMethod, constant);

for equals

Expression.Equal(member , constant);

now i need for greater than, less than but this comparison will be of two string so have to use CompareTo like string1.CompareTo(string2) > 0; i need this type of function so that i can use as above other functions.please help

asked Aug 07 '18 at 15:50

Sumit Sharma

why not just do (x=>x > y) – Steve Aug 07 '18 at 15:53
What is your end goal? Are you building an expression to do something like this? "this1">"this2" – rahicks Aug 07 '18 at 15:54
my goal is to make a expression for greater then and less than for comparing two string fields so that i can call like Expression.Call(member , containsMethod, constant); – Sumit Sharma Aug 07 '18 at 15:57
Something like this (using the static `string.Compare(string, string)`) - `Expression.LessThan(Expression.Call(typeof(string), "Compare", Type.EmptyTypes, member, constant), Expression.Constant(0))` – Ivan Stoev Aug 07 '18 at 16:06
@IvanStoev thanks buddy – Sumit Sharma Aug 07 '18 at 16:23

string compare greater than expression predicate

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