nullable types in c# code example

Example 1: set int to null c#

// Nullable types add null as a valid value in addition to the type range
Nullable<int> i = null;

// Can also be written as:
int? i = null;

Example 2: c# nullable generic

static void Main(string[] args)
{
    int? i = GetValueOrNull<int>(null, string.Empty);
}


public static Nullable<T> GetValueOrNull<T>(DbDataRecord reader, string columnName) where T : struct
{
    object columnValue = reader[columnName];

    if (!(columnValue is DBNull))
        return (T)columnValue;

    return null;
}

Example 3: c# nullable

double? pi = 3.14;
char? letter = 'a';

int m2 = 10;
int? m = m2;

bool? flag = null;

// An array of a nullable value type:
int?[] arr = new int?[10];