本文整理汇总了C#中System.IO.IsolatedStorage.IsolatedStorageFile.Lock方法的典型用法代码示例。如果您正苦于以下问题：C# IsolatedStorageFile.Lock方法的具体用法？C# IsolatedStorageFile.Lock怎么用？C# IsolatedStorageFile.Lock使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.IO.IsolatedStorage.IsolatedStorageFile的用法示例。
在下文中一共展示了IsolatedStorageFile.Lock方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: IsolatedStorageFileStream
public IsolatedStorageFileStream(String path, FileMode mode,
FileAccess access, FileShare share, int bufferSize,
IsolatedStorageFile isf)
{
if (path == null)
throw new ArgumentNullException("path");
Contract.EndContractBlock();
#if FEATURE_PAL
if (s_BackSlash == null)
s_BackSlash = new String(System.IO.Path.DirectorySeparatorChar,1);
#endif // FEATURE_PAL
if ((path.Length == 0) || path.Equals(s_BackSlash))
throw new ArgumentException(
Environment.GetResourceString(
"IsolatedStorage_Path"));
ulong oldFileSize=0, newFileSize;
bool fNewFile = false, fLock=false;
if (isf == null)
{
#if FEATURE_ISOSTORE_LIGHT
throw new ArgumentNullException("isf");
#else // !FEATURE_ISOSTORE_LIGHT
m_OwnedStore = true;
isf = IsolatedStorageFile.GetUserStoreForDomain();
#endif // !FEATURE_ISOSTORE_LIGHT
}
if (isf.Disposed)
throw new ObjectDisposedException(null, Environment.GetResourceString("IsolatedStorage_StoreNotOpen"));
m_isf = isf;
FileIOPermission fiop =
new FileIOPermission(FileIOPermissionAccess.AllAccess,
m_isf.RootDirectory);
fiop.Assert();
fiop.PermitOnly();
m_GivenPath = path;
m_FullPath = m_isf.GetFullPath(m_GivenPath);
RuntimeHelpers.PrepareConstrainedRegions();
try { // for finally Unlocking locked store
// Cache the old file size if the file size could change
// Also find if we are going to create a new file.
switch (mode) {
case FileMode.CreateNew: // Assume new file
#if FEATURE_ISOSTORE_LIGHT
// We are going to call Reserve so we need to lock the store.
m_isf.Lock(ref fLock);
#endif
fNewFile = true;
break;
case FileMode.Create: // Check for New file & Unreserve
case FileMode.OpenOrCreate: // Check for new file
case FileMode.Truncate: // Unreserve old file size
case FileMode.Append: // Check for new file
m_isf.Lock(ref fLock); // oldFileSize needs to be
// protected
try {
#if FEATURE_ISOSTORE_LIGHT
oldFileSize = IsolatedStorageFile.RoundToBlockSize((ulong)(new FileInfo(m_FullPath).Length));
#else
oldFileSize = IsolatedStorageFile.RoundToBlockSize((ulong)LongPathFile.GetLength(m_FullPath));
#endif
} catch (FileNotFoundException) {
fNewFile = true;
} catch {
}
break;
case FileMode.Open: // Open existing, else exception
break;
default:
throw new ArgumentException(
Environment.GetResourceString(
"IsolatedStorage_FileOpenMode"));
}
if (fNewFile)
m_isf.ReserveOneBlock();
try {
#if FEATURE_ISOSTORE_LIGHT
m_fs = new
FileStream(m_FullPath, mode, access, share, bufferSize,
FileOptions.None, m_GivenPath, true);
//.........这里部分代码省略.........
示例2: IsolatedStorageFileStream
public IsolatedStorageFileStream(String path, FileMode mode,
FileAccess access, FileShare share, int bufferSize,
IsolatedStorageFile isf)
{
if (path == null)
throw new ArgumentNullException("path");
if (s_BackSlash == null)
s_BackSlash = new String(System.IO.Path.DirectorySeparatorChar,1);
if ((path.Length == 0) || path.Equals(s_BackSlash))
throw new ArgumentException(
Environment.GetResourceString(
"IsolatedStorage_path"));
ulong oldFileSize=0, newFileSize;
bool fNewFile = false, fLock=false;
FileInfo fOld;
if (isf == null)
{
m_OwnedStore = true;
isf = IsolatedStorageFile.GetUserStoreForDomain();
}
m_isf = isf;
FileIOPermission fiop =
new FileIOPermission(FileIOPermissionAccess.AllAccess,
m_isf.RootDirectory);
fiop.Assert();
fiop.PermitOnly();
m_GivenPath = path;
m_FullPath = m_isf.GetFullPath(m_GivenPath);
try { // for finally Unlocking locked store
// Cache the old file size if the file size could change
// Also find if we are going to create a new file.
switch (mode) {
case FileMode.CreateNew: // Assume new file
fNewFile = true;
break;
case FileMode.Create: // Check for New file & Unreserve
case FileMode.OpenOrCreate: // Check for new file
case FileMode.Truncate: // Unreserve old file size
case FileMode.Append: // Check for new file
m_isf.Lock(); // oldFileSize needs to be
// protected
fLock = true; // Lock succeded
try {
fOld = new FileInfo(m_FullPath);
oldFileSize = IsolatedStorageFile.RoundToBlockSize((ulong)fOld.Length);
} catch (FileNotFoundException) {
fNewFile = true;
} catch {
}
break;
case FileMode.Open: // Open existing, else exception
break;
default:
throw new ArgumentException(
Environment.GetResourceString(
"IsolatedStorage_FileOpenMode"));
}
if (fNewFile)
m_isf.ReserveOneBlock();
try {
m_fs = new
FileStream(m_FullPath, mode, access, share, bufferSize,
FileOptions.None, m_GivenPath, true);
} catch {
if (fNewFile)
m_isf.UnreserveOneBlock();
throw;
}
// make adjustment to the Reserve / Unreserve state
if ((fNewFile == false) &&
((mode == FileMode.Truncate) || (mode == FileMode.Create)))
{
newFileSize = IsolatedStorageFile.RoundToBlockSize((ulong)m_fs.Length);
if (oldFileSize > newFileSize)
m_isf.Unreserve(oldFileSize - newFileSize);
else if (newFileSize > oldFileSize) // Can this happen ?
//.........这里部分代码省略.........