How to check a List for values

Question

Hi, I have a List values = new List (); values.add("0");This values.add("1"); values.add("9)"; Only values 0 and 9 are valid so therefore I must check if the list above has values that are different from the values 0 and 9. I need help with that from someone that is experienced in C#. I have tried with this; This if statement will always be true because I only check for 0 and 9. if (values.ContainshT("0") && values.Contains("9")) This if statement will also be true because there is an item that is different from 0 and 9. if (!values.ContainshT("0") && !values.Contains("9")) How to check if items exist other than 0 and 9 it is false and if only items 0 and 9 exist then it is true.

Nitin Sontakke · Answer

Hello, Here is a piece of code you can try. This cannot be achieved by a single if statement. You will need to check EACH element of an list. private void button2_Click( object sender, EventArgs e) { List validValues = new List (); validValues.Add( "0" ); validValues.Add( "9" ); List values1 = new List (); values1.Add( "9" ); values1.Add( "3" ); values1.Add( "0" ); values1.Add( "9" ); values1.Add( "4" ); values1.Add( "1" ); values1.Add( "9" ); values1.Add( "6" ); values1.Add( "1" ); List values2 = new List (); values2.Add( "9" ); values2.Add( "0" ); values2.Add( "9" ); values2.Add( "0" ); values2.Add( "9" ); values2.Add( "0" ); values2.Add( "9" ); values2.Add( "0" ); values2.Add( "9" ); Boolean result1 = validValuesOnly(validValues, values1); // returns False Boolean result2 = validValuesOnly(validValues, values2); // returns True } private Boolean validValuesOnly(List validValues, List values) { foreach (String value in values) { if (!validValues.Contains(value)) return false ; } return true ; } Hope it helps!

Sachin Singh · Answer

if i am not wrong this can be achieved with a single If if (strList.Any(x=>!(x== "0" || x== "9" )) { // do processing }

Sachin Singh · Answer

you were almost there , just a little modification required bool isValid= strList.Any(x=>!(x== "0" || x== "9" );