public void DeleteSubKeyTree(string subkey, bool throwOnMissingSubKey)
{
ValidateKeyName(subkey);
// Security concern: Deleting a hive's "" subkey would delete all
// of that hive's contents. Don't allow "".
if (subkey.Length == 0 && IsSystemKey())
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegKeyDelHive);
}
EnsureWriteable();
subkey = FixupName(subkey); // Fixup multiple slashes to a single slash
CheckPermission(RegistryInternalCheck.CheckSubTreeWritePermission, subkey, false, RegistryKeyPermissionCheck.Default);
RegistryKey key = InternalOpenSubKeyWithoutSecurityChecks(subkey, true);
if (key != null)
{
using (key)
{
if (key.InternalSubKeyCount() > 0)
{
string[] keys = key.InternalGetSubKeyNames();
for (int i = 0; i < keys.Length; i++)
{
key.DeleteSubKeyTreeInternal(keys[i]);
}
}
}
DeleteSubKeyTreeCore(subkey);
}
else if (throwOnMissingSubKey)
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegSubKeyAbsent);
}
}
public void DeleteValue(string name, bool throwOnMissingValue)
{
EnsureWriteable();
int errorCode = Win32Native.RegDeleteValue(_hkey, name);
//
// From windows 2003 server, if the name is too long we will get error code ERROR_FILENAME_EXCED_RANGE
// This still means the name doesn't exist. We need to be consistent with previous OS.
//
if (errorCode == Interop.Errors.ERROR_FILE_NOT_FOUND || errorCode == Interop.Errors.ERROR_FILENAME_EXCED_RANGE)
{
if (throwOnMissingValue)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RegSubKeyValueAbsent);
}
// Otherwise, just return giving no indication to the user.
// (For compatibility)
}
// We really should throw an exception here if errorCode was bad,
// but we can't for compatibility reasons.
Debug.Assert(errorCode == 0, "RegDeleteValue failed. Here's your error code: " + errorCode);
}
private static void ValidateKeyName(string name)
{
if (name == null)
{
ThrowHelper.ThrowArgumentNullException(nameof(name));
}
int nextSlash = name.IndexOf("\\", StringComparison.OrdinalIgnoreCase);
int current = 0;
while (nextSlash != -1)
{
if ((nextSlash - current) > MaxKeyLength)
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegKeyStrLenBug, nameof(name));
}
current = nextSlash + 1;
nextSlash = name.IndexOf("\\", current, StringComparison.OrdinalIgnoreCase);
}
if ((name.Length - current) > MaxKeyLength)
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegKeyStrLenBug, nameof(name));
}
}
/// <summary>
/// An internal version which does no security checks or argument checking. Skipping the
/// security checks should give us a slight perf gain on large trees.
/// </summary>
private void DeleteSubKeyTreeInternal(string subkey)
{
RegistryKey key = InternalOpenSubKeyWithoutSecurityChecks(subkey, true);
if (key != null)
{
using (key)
{
if (key.InternalSubKeyCount() > 0)
{
string[] keys = key.InternalGetSubKeyNames();
for (int i = 0; i < keys.Length; i++)
{
key.DeleteSubKeyTreeInternal(keys[i]);
}
}
}
DeleteSubKeyTreeCore(subkey);
}
else
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegSubKeyAbsent);
}
}
private unsafe void SetValueCore(string name, object value, RegistryValueKind valueKind)
{
int ret = 0;
try
{
switch (valueKind)
{
case RegistryValueKind.ExpandString:
case RegistryValueKind.String:
{
string data = value.ToString();
ret = Interop.Advapi32.RegSetValueEx(_hkey,
name,
0,
valueKind,
data,
checked (data.Length * 2 + 2));
break;
}
case RegistryValueKind.MultiString:
{
// Other thread might modify the input array after we calculate the buffer length.
// Make a copy of the input array to be safe.
string[] dataStrings = (string[])(((string[])value).Clone());
// First determine the size of the array
//
// Format is null terminator between strings and final null terminator at the end.
// e.g. str1\0str2\0str3\0\0
//
int sizeInChars = 1; // no matter what, we have the final null terminator.
for (int i = 0; i < dataStrings.Length; i++)
{
if (dataStrings[i] == null)
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegSetStrArrNull);
}
sizeInChars = checked (sizeInChars + (dataStrings[i].Length + 1));
}
int sizeInBytes = checked (sizeInChars * sizeof(char));
// Write out the strings...
//
char[] dataChars = new char[sizeInChars];
int destinationIndex = 0;
for (int i = 0; i < dataStrings.Length; i++)
{
int length = dataStrings[i].Length;
dataStrings[i].CopyTo(0, dataChars, destinationIndex, length);
destinationIndex += (length + 1); // +1 for null terminator, which is already zero-initialized in new array.
}
ret = Interop.Advapi32.RegSetValueEx(_hkey,
name,
0,
RegistryValueKind.MultiString,
dataChars,
sizeInBytes);
break;
}
case RegistryValueKind.None:
case RegistryValueKind.Binary:
byte[] dataBytes = (byte[])value;
ret = Interop.Advapi32.RegSetValueEx(_hkey,
name,
0,
(valueKind == RegistryValueKind.None ? Interop.Advapi32.RegistryValues.REG_NONE : RegistryValueKind.Binary),
dataBytes,
dataBytes.Length);
break;
case RegistryValueKind.DWord:
{
// We need to use Convert here because we could have a boxed type cannot be
// unboxed and cast at the same time. I.e. ((int)(object)(short) 5) will fail.
int data = Convert.ToInt32(value, System.Globalization.CultureInfo.InvariantCulture);
ret = Interop.Advapi32.RegSetValueEx(_hkey,
name,
0,
RegistryValueKind.DWord,
ref data,
4);
break;
}
case RegistryValueKind.QWord:
{
long data = Convert.ToInt64(value, System.Globalization.CultureInfo.InvariantCulture);
ret = Interop.Advapi32.RegSetValueEx(_hkey,
name,
0,
RegistryValueKind.QWord,
ref data,
8);
break;
}
}
}
catch (Exception exc) when(exc is OverflowException || exc is InvalidOperationException || exc is FormatException || exc is InvalidCastException)
{
ThrowHelper.ThrowArgumentException(SR.Arg_RegSetMismatchedKind);
}
if (ret == 0)
{
SetDirty();
}
else
{
Win32Error(ret, null);
}
}
public unsafe void SetValue(string name, object value, RegistryValueKind valueKind)
{
if (value == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.value);
}
if (name != null && name.Length > MaxValueLength)
{
throw new ArgumentException(SR.Arg_RegValStrLenBug);
}
if (!Enum.IsDefined(typeof(RegistryValueKind), valueKind))
{
throw new ArgumentException(SR.Arg_RegBadKeyKind, nameof(valueKind));
}
EnsureWriteable();
if (valueKind == RegistryValueKind.Unknown)
{
// this is to maintain compatibility with the old way of autodetecting the type.
// SetValue(string, object) will come through this codepath.
valueKind = CalculateValueKind(value);
}
int ret = 0;
try
{
switch (valueKind)
{
case RegistryValueKind.ExpandString:
case RegistryValueKind.String:
{
string data = value.ToString();
ret = Win32Native.RegSetValueEx(_hkey,
name,
0,
valueKind,
data,
checked (data.Length * 2 + 2));
break;
}
case RegistryValueKind.MultiString:
{
// Other thread might modify the input array after we calculate the buffer length.
// Make a copy of the input array to be safe.
string[] dataStrings = (string[])(((string[])value).Clone());
int sizeInBytes = 0;
// First determine the size of the array
//
for (int i = 0; i < dataStrings.Length; i++)
{
if (dataStrings[i] == null)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RegSetStrArrNull);
}
sizeInBytes = checked (sizeInBytes + (dataStrings[i].Length + 1) * 2);
}
sizeInBytes = checked (sizeInBytes + 2);
byte[] basePtr = new byte[sizeInBytes];
fixed(byte *b = basePtr)
{
IntPtr currentPtr = new IntPtr((void *)b);
// Write out the strings...
//
for (int i = 0; i < dataStrings.Length; i++)
{
// Assumes that the Strings are always null terminated.
string.InternalCopy(dataStrings[i], currentPtr, (checked (dataStrings[i].Length * 2)));
currentPtr = new IntPtr((long)currentPtr + (checked (dataStrings[i].Length * 2)));
*(char *)(currentPtr.ToPointer()) = '\0';
currentPtr = new IntPtr((long)currentPtr + 2);
}
*(char *)(currentPtr.ToPointer()) = '\0';
currentPtr = new IntPtr((long)currentPtr + 2);
ret = Win32Native.RegSetValueEx(_hkey,
name,
0,
RegistryValueKind.MultiString,
basePtr,
sizeInBytes);
}
break;
}
case RegistryValueKind.None:
case RegistryValueKind.Binary:
byte[] dataBytes = (byte[])value;
ret = Win32Native.RegSetValueEx(_hkey,
name,
0,
(valueKind == RegistryValueKind.None ? Win32Native.REG_NONE : RegistryValueKind.Binary),
dataBytes,
dataBytes.Length);
break;
case RegistryValueKind.DWord:
{
// We need to use Convert here because we could have a boxed type cannot be
// unboxed and cast at the same time. I.e. ((int)(object)(short) 5) will fail.
int data = Convert.ToInt32(value, System.Globalization.CultureInfo.InvariantCulture);
ret = Win32Native.RegSetValueEx(_hkey,
name,
0,
RegistryValueKind.DWord,
ref data,
4);
break;
}
case RegistryValueKind.QWord:
{
long data = Convert.ToInt64(value, System.Globalization.CultureInfo.InvariantCulture);
ret = Win32Native.RegSetValueEx(_hkey,
name,
0,
RegistryValueKind.QWord,
ref data,
8);
break;
}
}
}
catch (OverflowException)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RegSetMismatchedKind);
}
catch (InvalidOperationException)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RegSetMismatchedKind);
}
catch (FormatException)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RegSetMismatchedKind);
}
catch (InvalidCastException)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RegSetMismatchedKind);
}
if (ret == 0)
{
SetDirty();
}
else
{
Win32Error(ret, null);
}
}