LINQ Query with Array input and variable Where Statements - Advice

Question

I would like to query data given an array to filter by via WCF Data Services using the Silverlight Client API. Basically, I want to query Employees given a list (array) of

Answer 1

You can dynamically build the expression tree for the condition.

var parameter = Expression.Parameter(typeof(Employee), "employee");

Expression condition = Expression.Constant(false);

foreach (var state in states)
{
    condition = Expression.OrElse(
        condition,
        Expression.Equal(
            Expression.Property(parameter, "State"),
            Expression.Constant(state)));
}

var expression = Expression.Lambda>(condition, parameter);

And then just perform the call.

var result = Context.Employees.Where(expression);

I am not 100% sure if this will work out of the box for you but I hope the general idea helps.