C# Nullable Int – How to Set Null Value to int in C#

.netc++intnullnullable

int value=0;

if (value == 0)
{
    value = null;
}

How can I set value to null above?

Any help will be appreciated.

Best Answer

In .Net, you cannot assign a null value to an int or any other struct. Instead, use a Nullable<int>, or int? for short:

int? value = 0;

if (value == 0)
{
    value = null;
}

Further Reading

Nullable Types (C# Programming Guide)

Related Solutions

C# – Keep Null When Adding Nullable Int

One option might be an extension method using Aggregate. Something like:

public static int? NullableSum(this IEnumerable<int?> values)
{
    return values.Aggregate((int?)null, (sum, value)   
        => value.HasValue ? (sum ?? 0) + value : sum + 0);
}

Functionality wise it does much the same thing as your custom Sum method, without iterating through the array twice.

Essentially it sets the initial value to null, but as soon as it sees any non null value it starts treating the null values as 0.

Thus, if all inputs are null it returns null - otherwise it acts basically the same way as LINQ's Sum.

Best Answer

Related Solutions

C# – Keep Null When Adding Nullable Int

Related Question