C#

public bool compare(object a, object b)
{
      if ((a is int) && (b is int))
           return (int)a < (int)b;
      ...
}

WSonck wrote:

I need to do a dynamic cast.

SomeClass castedReference = (SomeClass)objectReference;
SomeClass castedReference = objectReference as SomeClass;

bool isSomeObject = objectReference is SomeClass;

WSonck wrote:

In C++ there is dynamic_cast<>, but I don't know how to do this in C#. I expect that you can help me.

SomeObject sobj = new SomeObject();

ADifferentObject diffObj = sobj as SomeObject(); //will return null if SomeObject is not a base class of ADiffObject

Colin Angus Mackay wrote:

How do you determine whether the null after the cast was because of an invalid cast, or because the reference was null in the first place?

if ( originalObject == null )
{
      ... action ...
}
else
{
    NewObjectType newObj = originalObject as NewObjectType;
    if ( newObj == null )
    {
           ... alternative action ...
    }
}

Liron Hirsch wrote:

Just want ot be a little bit more effective

dan neely wrote:

it would almost certainly have to be done via a win32 api call.

[DllImport("kernel32.dll")]
private extern static void GetSystemTime(ref SYSTEMTIME lpSystemTime);

[DllImport("kernel32.dll")]
private extern static uint SetSystemTime(ref SYSTEMTIME lpSystemTime);

private struct SYSTEMTIME
{
    public ushort wYear;
    public ushort wMonth;
    public ushort wDayOfWeek;
    public ushort wDay;
    public ushort wHour;
    public ushort wMinute;
    public ushort wSecond;
    public ushort wMilliseconds;
}


private void SetTime()
{
    // Call the native GetSystemTime method
    // with the defined structure.
    SYSTEMTIME systime = new SYSTEMTIME();
    GetSystemTime(ref systime);

    // Set the system clock ahead two hours.
    systime.wHour = (ushort)(systime.wHour + 2 % 24);
    SetSystemTime(ref systime);
}