System.Configuration.ConfigurationErrorsException.SafeFilename C# (CSharp) Метод

        internal static string SafeFilename(string filename) {
            if (string.IsNullOrEmpty(filename)) {
                return filename;
            }

            // configuration file can be an http URL in IE
            if (StringUtil.StartsWithIgnoreCase(filename, HTTP_PREFIX)) {
                return filename;
            }

            //
            // If it is a relative path, return it as is. 
            // This could happen if the exception was constructed from the serialization constructor,
            // and the caller did not have PathDiscoveryPermission for the file.
            //
            try {
                if (!Path.IsPathRooted(filename)) {
                    return filename;
                }
            }
            catch {
                return null;
            }

            try {
                // Confirm that it is a full path.
                // GetFullPath will also Demand PathDiscovery for the resulting path
                string fullPath = Path.GetFullPath(filename);
            } 
            catch (SecurityException) {
                // Get just the name of the file without the directory part.
                try {
                    string fullPath = FullPathWithAssert(filename);
                    filename = Path.GetFileName(fullPath);
                }
                catch {
                    filename = null;
                }
            }
            catch {
                filename = null;
            }

            return filename;
        }