Registry SetValue stores double as REG_SZ

  • Thread starter Thread starter ChuckD_Duncan
  • Start date Start date
C

ChuckD_Duncan

using Microsoft.Win32;
RegistryKey key = Registry.LocalMachine;
key = key.OpenSubKey(".....");
...
key = key.OpenSubKey("PCF", true);
double aDoubleValue = 0.25;
key.SetValue("testkey", aDoubleValue);

testkey pre-existed as a DWORD value and after the setvalue becomes a
REG_SZ type. Even tried casting the aDoubleValue, but no change.

Whats wrong with SetValue?

Thanks in advance.
Chuck
 
Hello Chuck,
testkey pre-existed as a DWORD value and after the setvalue becomes a
REG_SZ type. Even tried casting the aDoubleValue, but no change.
Click to expand...

The native types for registry values are strings, binary values and DWORDs
(integers). There is no native type for storing a floating point value. If
you give the SetValue method a double value, it gets converted to a string.
So, the method works as expected.

You should either round or convert the value to an Int32 first, or store it
as a binary value if a string won't do. For example:

--------------------------------
Microsoft.Win32.RegistryKey key =
Registry.CurrentUser.OpenSubKey("Software\\ACME",true);
double myValue = 123.45;
key.SetValue("My Value",System.Convert.ToInt32(myValue));
key.Close();

--------------------------------

Hope this helps.

--
Regards,

Mr. Jani Järvinen
C# MVP
Helsinki, Finland
(e-mail address removed)
http://www.saunalahti.fi/janij/
 
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