// If it's necessary to throw up a "This file exists, are you sure?" kind of
// MessageBox, here's where we do it
// Return value is whether or not the user hit "okay".
internal virtual bool PromptUserIfAppropriate(string fileName)
{
if ((options & NativeMethods.OFN_FILEMUSTEXIST) != 0)
{
bool fileExists = false;
// SECREVIEW : We must Assert just to check if the file exists. Since
// : we are doing this as part of the FileDialog, this is
// : OK.
//
new FileIOPermission(FileIOPermissionAccess.Read, IntSecurity.UnsafeGetFullPath(fileName)).Assert();
try {
fileExists = File.Exists(fileName);
}
finally {
CodeAccessPermission.RevertAssert();
}
if (!fileExists)
{
PromptFileNotFound(fileName);
return(false);
}
}
return(true);
}
public Stream OpenFile()
{
Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogOpenFile Demanded");
IntSecurity.FileDialogOpenFile.Demand();
string filename = FileNamesInternal[0];
if (filename == null || (filename.Length == 0))
{
throw new ArgumentNullException("FileName");
}
Stream s = null;
// SECREVIEW : We demanded the FileDialog permission above, so it is safe
// : to assert this here. Since the user picked the file, it
// : is OK to give them readonly access to the stream.
//
new FileIOPermission(FileIOPermissionAccess.Read, IntSecurity.UnsafeGetFullPath(filename)).Assert();
try
{
s = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
}
finally
{
CodeAccessPermission.RevertAssert();
}
return(s);
}
public Stream OpenFile()
{
Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogOpenFile Demanded");
IntSecurity.FileDialogOpenFile.Demand();
string filename = FileNamesInternal[0];
if (filename == null || (filename.Length == 0))
{
throw new ArgumentNullException(nameof(FileName));
}
Stream s = null;
//
new FileIOPermission(FileIOPermissionAccess.Read, IntSecurity.UnsafeGetFullPath(filename)).Assert();
try
{
s = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
}
finally
{
CodeAccessPermission.RevertAssert();
}
return(s);
}
public Stream OpenFile()
{
Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogSaveFile Demanded");
IntSecurity.FileDialogSaveFile.Demand();
string filename = FileNamesInternal[0];
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("FileName");
}
Stream s = null;
//
new FileIOPermission(FileIOPermissionAccess.AllAccess, IntSecurity.UnsafeGetFullPath(filename)).Assert();
try {
s = new FileStream(filename, FileMode.Create, FileAccess.ReadWrite);
}
finally {
CodeAccessPermission.RevertAssert();
}
return(s);
}
internal static bool FileExists(string fileName)
{
bool fileExists = false;
try {
// SECREVIEW : We must Assert just to check if the file exists. Since
// : we are doing this as part of the FileDialog, this is OK.
new FileIOPermission(FileIOPermissionAccess.Read, IntSecurity.UnsafeGetFullPath(fileName)).Assert();
try {
fileExists = File.Exists(fileName);
}
finally {
CodeAccessPermission.RevertAssert();
}
}
catch (System.IO.PathTooLongException) {
}
return(fileExists);
}
internal static bool FileExists(string fileName)
{
bool fileExists = false;
try {
//
new FileIOPermission(FileIOPermissionAccess.Read, IntSecurity.UnsafeGetFullPath(fileName)).Assert();
try {
fileExists = File.Exists(fileName);
}
finally {
CodeAccessPermission.RevertAssert();
}
}
catch (System.IO.PathTooLongException) {
}
return(fileExists);
}