I want to generate sequence identifiers with the int/long type in C#, but I don't want to use the databases for storing the generated values, how can I do that? Would the CPU tick counter be helpful? Or do you have any other ideas?
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1Do you need this to be persistent?Oded– Oded2011-05-09 06:06:30 +00:00Commented May 9, 2011 at 6:06
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1Do you need a monotonically increasing counter?Gabe– Gabe2011-05-09 06:09:29 +00:00Commented May 9, 2011 at 6:09
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2 Answers
Try this:
using Microsoft.Win32;
RegistryKey key =
Registry.LocalMachine.CreateSubKey ("The Right Value");
private void InitializeTheKey()
{
this.MaxIndex = 0; // Or any other value ..
}
public Int32 MaxIndex
{
get{ return key.GetValue("MaxIndex"); }
set{ key.SetValue ("MaxIndex", value); }
}
public Int32 GetNewIndex()
{
this.MaxIndex += 1;
return this.MaxIndex;
}
WARNING: DO NOT PLAY WITH THE REGISTRY. If you do not know what you are doing, you can cause any number of costly problems. Use this code at your own risk.
As long as Int32 is okay, just use rand:
Random rand = new Random();
int newID = rand.Next(0, Int32.MaxValue);
Or for Int64, someone has posted an extension method you could use here: Generate random values in C#
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