Convert Contains To Expression Tree

Question

Related To: Create a Lambda Expression With 3 conditions

Please consider this Code:

from a in myTbl
where a.Address.Contains(strToCheck)
select a

How I can convert this to Expression Tree and write above code with Expressions? Main Problem is converting a.Address.Contains(strToCheck) to Expression Tree.

Edit 1) Address is a string field and strToCheck is a string

Thanks

Answer 1

a.Address.Contains(strToCheck) represents a call to string.Contains instance method on a.Address instance with strToCheck argument.

The simplest way to build the corresponding expression is to use the following Expression.Call overload:

public static MethodCallExpression Call(
    Expression instance,
    string methodName,
    Type[] typeArguments,
    params Expression[] arguments
)

like this (using the terms from the linked question):

var body = Expression.Call(
    Expression.PropertyOrField(param, "Address"), // instance
    "Contains", // method
    Type.EmptyTypes, // no generic type arguments
    Expression.Constant(strToCheck) // argument
);