Question

for example when I wrote:

Char[] test = new Char[3] {a,b,c};
test[2] = null;

it says Cannot convert null to ‘char’ because it is a non-nullable value type

if I need to empty that array of char, is there a solution?

Answer 1

Use a nullable char:

char?[] test = new char?[3] {a,b,c};
test[2] = null;

The drawback is you have to check for a value each time you access the array:

char c = test[1];  // illegal

if(test[1].HasValue)
{
    char c = test[1].Value;
}

or you could use a “magic” char value to represent null, like \0:

char[] test = new char[3] {a,b,c};
test[2] = '\0';