C# – How is memory allocated for a static variable

cmemory-managementnet

In the below program:

class Main
{   
    static string staticVariable = "Static Variable";
    string instanceVariable = "Instance Variable";

    public Main(){}   
}

The instanceVariable will be stored inside the memory allocated for object instance. Where will the staticVariable be stored, is it stored in the object instance itself or somewhere else? If its stored somewhere else, how are the memory locations connected?

Best Answer

Memory for static variables are normally held in some rooted (and hidden) object[]. This can be seen doing a !gcroot on the object in WinDbg (with SOS).

Just to add, these references can never be GC'ed (unless you null the field), as I discovered recently.

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C# – How to calculate someone’s age based on a DateTime type birthday

An easy to understand and simple solution.

// Save today's date.
var today = DateTime.Today;

// Calculate the age.
var age = today.Year - birthdate.Year;

// Go back to the year in which the person was born in case of a leap year
if (birthdate.Date > today.AddYears(-age)) age--;

However, this assumes you are looking for the western idea of the age and not using East Asian reckoning.

C# – How to cast int to enum

From an int:

YourEnum foo = (YourEnum)yourInt;

From a string:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")
}

Update:

From number you can also

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

Best Answer

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C# – How to calculate someone’s age based on a DateTime type birthday

C# – How to cast int to enum

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