public static void RegistrySet() { // // This code example produces output similar to the following: // //NoSuchName: Return this default if NoSuchName does not exist. //(Default): 5280 //TestLong: 12345678901234 //TestArray(0): One //TestArray(1): Two //TestArray(2): Three //TestExpand: My path: %path% //TestExpand2: My path: D:\Program Files\Microsoft.NET\… // //Use the registry editor to examine the key. //Press the Enter key to delete the key
// The name of the key must include a valid root.
const string userRoot = "HKEY_CURRENT_USER";
const string subkey = "RegistrySetValueExample";
const string keyName = userRoot + "\\" + subkey;
// An int value can be stored without specifying the
// registry data type, but long values will be stored
// as strings unless you specify the type. Note that
// the int is stored in the default name/value
// pair.
Registry.SetValue(keyName, "", 5280);
Registry.SetValue(keyName, "TestLong", 12345678901234,
RegistryValueKind.QWord);
// Strings with expandable environment variables are
// stored as ordinary strings unless you specify the
// data type.
Registry.SetValue(keyName, "TestExpand", "My path: %path%");
Registry.SetValue(keyName, "TestExpand2", "My path: %path%",
RegistryValueKind.ExpandString);
// Arrays of strings are stored automatically as
// MultiString. Similarly, arrays of Byte are stored
// automatically as Binary.
string[] strings = { "One", "Two", "Three" };
Registry.SetValue(keyName, "TestArray", strings);
// Your default value is returned if the name/value pair
// does not exist.
string noSuch = (string)Registry.GetValue(keyName,
"NoSuchName",
"Return this default if NoSuchName does not exist.");
Console.WriteLine("\r\nNoSuchName: {0}", noSuch);
// Retrieve the int and long values, specifying
// numeric default values in case the name/value pairs
// do not exist. The int value is retrieved from the
// default (nameless) name/value pair for the key.
int tInteger = (int)Registry.GetValue(keyName, "", -1);
Console.WriteLine("(Default): {0}", tInteger);
long tLong = (long)Registry.GetValue(keyName, "TestLong",
long.MinValue);
Console.WriteLine("TestLong: {0}", tLong);
// When retrieving a MultiString value, you can specify
// an array for the default return value.
string[] tArray = (string[])Registry.GetValue(keyName,
"TestArray",
new string[] { "Default if TestArray does not exist." });
for (int i = 0; i < tArray.Length; i++)
{
Console.WriteLine("TestArray({0}): {1}", i, tArray[i]);
}
// A string with embedded environment variables is not
// expanded if it was stored as an ordinary string.
string tExpand = (string)Registry.GetValue(keyName,
"TestExpand",
"Default if TestExpand does not exist.");
Console.WriteLine("TestExpand: {0}", tExpand);
// A string stored as ExpandString is expanded.
string tExpand2 = (string)Registry.GetValue(keyName,
"TestExpand2",
"Default if TestExpand2 does not exist.");
Console.WriteLine("TestExpand2: {0}…",
tExpand2.Substring(0, 40));
Console.WriteLine("\r\nUse the registry editor to examine the key.");
Console.WriteLine("Press the Enter key to delete the key.");
Console.ReadLine();
Registry.CurrentUser.DeleteSubKey(subkey);
}
