Question

I have got the list of Class Name as Follows:

Type[] typelist = typeof(Sample.Students).Assembly.GetTypes();

now i have complete list of all classes available in Sample NameSpace:

Now i want to get data through class
I am using Devexpress Persistance class
so basically i have to create XPQuert Object as follows:

XPQuery<Employee> EmployeeQuery = new  XPQuery<Employees>(XPODefault.Session);

but in my case Employee class will be listed in typelist variable..
How can i create the object of XPQuery.. is it possible something like this:

XPQuery<typeof(typelist[0].Name)> EMployeeQuery = new XPQuery<typeof(typelist.Name)> (XPODefault.Session);

i meant i want to create object dynamically.. how can i do
Thanks..

Answer 1

You can do something like:

public static IQueryable CreateQueryInstance(Type queryType) 
{
    var genericQueryTypeDefinition = typeof(XPQuery<>);
    var queryTypeArguments = new[] { typeof(queryType) };
    var genericQueryType = genericQueryTypeDefinition.MakeGenericType(queryTypeArguments);
    var queryObject = (IQueryable)Activator.CreateInstance(genericQueryType, <your parameters here>);

    return queryObject;
}

And then use it as:

var myQueryObject = CreateQueryInstance(typelist[0]);

Of course you will NOT be able to have a nice XPQuery as you don’t know the type at the compile time, but you still can have an IQueryable to start from.