I have an array of
Expression<Func<MyClass,bool>>
However, I want to AND them all together to get just a single item of that type. How do I do this? Can I cast the result of Expression.And?
If you use the following extension method:
public static Expression<Func<T, bool>> And<T> (this Expression<Func<T, bool>> expr1,
Expression<Func<T, bool>> expr2)
{
var invokedExpr = Expression.Invoke (expr2, expr1.Parameters.Cast<Expression> ());
return Expression.Lambda<Func<T, bool>>
(Expression.AndAlso (expr1.Body, invokedExpr), expr1.Parameters);
}
From here: http://www.albahari.com/nutshell/predicatebuilder.aspx
Then you can just write this to fold them all down to one expression.
public Expression<Func<T, bool>> AggregateAnd(Expression<Func<T,bool>>[] input)
{
return input.Aggregate((l,r) => l.And(r));
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With