The primitive data types are predefined by the language, and they are named by reserved keywords. They represent the basic types of the language.
The CodingSeb.ExpressionEvaluator manages the following list of C# primary types.
You can add additional types by using the evaluator.Types.Add method as shown below.
public static void Example1()
{
ExpressionEvaluator evaluator = new ExpressionEvaluator();
evaluator.Types.Add(typeof(Customer));
string script = @"
Customer customer = new Customer()
{
FirstName = ""Mark"",
LastName = ""Upston"",
BirthDate = new DateTime(1977, 12, 10)
};
Console.WriteLine(""Name: {0} {1}\nBirth Date: {2} "", customer.FirstName, customer.LastName, customer.BirthDate);
";
Console.WriteLine(evaluator.ScriptEvaluate(script));
}
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime BirthDate { get; set; }
}
You can also block access of some types for security or any other reasons by adding it to the TypesToBlock list.
The following example doesn't make any sense, and it is just for demonstration purposes.
public static void Example2()
{
ExpressionEvaluator evaluator = new ExpressionEvaluator();
evaluator.Types.Add(typeof(Customer));
evaluator.TypesToBlock.Add(typeof(Customer));
string script = @"
Customer customer = new Customer()
{
FirstName = ""Mark"",
LastName = ""Upston"",
BirthDate = new DateTime(1977, 12, 10)
};
Console.WriteLine(""Name: {0} {1}\nBirth Date: {2} "", customer.FirstName, customer.LastName, customer.BirthDate);
";
Console.WriteLine(evaluator.ScriptEvaluate(script));
}
Now when you run the above code, you will get an exception.
To resolve types and namespaces CodingSeb.ExpressionEvaluator search in assemblies loaded in the evaluator.Assemblies list. By default, the following list of namespaces is available.
When the constructor of ExpressionEvaluator is called, evaluator.Assemblies list contains all loaded assemblies in the current AppDomain by default. You can easily Clear, Add or Remove assemblies on this list.
ExpressionEvaluator evaluator = new ExpressionEvaluator();
evaluator.Namespaces.Add(namespace);
evaluator.Namespaces.Remove(namespaceToRemove);