Binarywriter vs streamwriter


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AsEnumerable ; if folders. Id , folders , info. Add new RemoveDocumentUndoUnit this , info. GetFileName filePath ; if folders. Binary Writer Reader 2. Creating a sequential-access file 5. Reading a sequential-access file 6. BinaryWriter and BinaryReader classes for the writing and reading of primitive types 7.

Working with the BinaryWriter Class 8. Working with the BinaryReader Class 9. File pointer move and read binary file Write and then read back binary data Use BinaryReader and BinaryWriter to implement a simple inventory program Top Decorator Streams Decorator streams provide additional functionality to the stream at runtime.

Decorator streams are included in the following namespaces: IO BufferedStream - adds a buffering layer to read and write operations on another stream. Compression DeflateStream - provides methods and properties for compressing and decompressing streams by using the Deflate algorithm.

GZipStream - provides methods and properties used to compress and decompress streams. Cryptography CryptoStream - defines a stream that links data streams to cryptographic transformations. IO BinaryReader - reads primitive data types as binary values in a specific encoding. BinaryWriter - writes primitive types in binary to a stream and supports writing strings in a specific encoding.

TextReader - the abstract base class for reading character only data. TextWriter - the abstract base class for writing character only data. StreamReader - implements a TextReader that reads characters from a byte stream in a particular encoding. The backing store is a stream. Translation is required between bytes and characters. StreamWriter - implements a TextWriter for writing characters to a stream in a particular encoding. StringReader - implements a TextReader that reads from a string.

Backing store is String or StringBuilder. No translation required as backing store in already in character format. StringWriter - implements a TextWriter for writing information to a string. XmlWriter - Represents a writer that provides a fast, non-cached, forward-only way to generate streams or files that contain XML data.

Top Stream Class All stream classes are derived from the abstract Stream class. Additional useful Stream properties include: CanTimeout - determines whether the current stream can time out. Length - gets the length in bytes of the stream. Position - gets or sets the position within the current stream.

ReadTimeout - a value, in miliseconds, that determines how long the stream will attempt to read before timing out. WriteTimeout - a value, in miliseconds, that determines how long the stream will attempt to write before timing out.

Read - reads a sequence of bytes from the current stream and advances the position within the stream by the number of bytes read. ReadByte - Reads a byte from the stream and advances the position within the stream by one byte, or returns -1 if at the end of the stream. ReadAsync - asynchronously reads a sequence of bytes from the current stream and advances the position within the stream by the number of bytes read.

Additional useful Stream methods include: CopyTo - reads the bytes from the current stream and writes them to another stream. CopyToAsync - Asynchronously reads the bytes from the current stream and writes them to another stream. Dispose - releases all resources used by the Stream. Finalize - allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. Flush - clears all buffers for this stream and causes any buffered data to be written to the underlying device.

Seek - sets the position within the current stream. SetLength - sets the length of the current stream. Synchronized - creates a thread-safe synchronized wrapper around the specified Stream object. The three access parameters and their enumerations are: FileMode - specifies creation mode. Append - opens the file if it exists and seeks to the end of the file, or creates a new file.

Create - specifies a new file should be created. If the file already exists, it will be overwritten CreateNew - specifies a new file should be created. If the file already exists, an IOException exception is thrown. Open - specifies that the operating system should open an existing file.

The ability to open the file is dependent on the value specified by the FileAccess enumeration. FileNotFoundException exception is thrown if the file does not exist.

OpenorCreate - specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess. Read permission is required. If the file access is FileAccess. Write permission is required. Write permissions are required. Truncate - specifies that the operating system should open an existing file.

When the file is opened, it should be truncated so that its size is zero bytes. Attempts to read from a file opened with FileMode. Truncate cause an ArgumentException exception. Read - read access to the file. ReadWrite - read and write access to the file Write - write access to the file FileShare - specifies sharing permission. Used to define how much access to grant other processes wanting to use the same file before the current process is finished with it.

Delete - allows subsequent deleting of a file. Inheritable - makes the file handle inheritable by child processes. None - declines sharing of the current file. Any request to open the file by this process or another process will fail until the file is closed.

Read - Default allows subsequent opening of the file for reading. ReadWrite - allows subsequent opening of the file for reading or writing. Write - allows subsequent opening of the file for writing. Some of the advanced FileStream characteristics are controlled through the use of the following additional parameters in the FileStream constructor: FileSystemRights - enumeration contains granular system rights which can be dynamically assigned. FileSecurity - class is an abstraction of the underlying Microsoft Windows file security system.

In this system, each file has a discretionary access control list DACL , which controls access to the file, and a system access control list SACL , which specifies the access control attempts that are audited. FileOptions - enumeration which allows a bitwise combination of its member values. Asynchronous - Indicates that a file can be used for asynchronous reading and writing. DeleteOnClose - Indicates that a file is automatically deleted when it is no longer in use.

Encrypted - Indicates that a file is encrypted and can be decrypted only by using the same user account used for encryption. None - Indicates that no additional options should be used when creating a FileStream object. RandomAccess - Indicates that the file is accessed randomly.

The system can use this as a hint to optimize file caching. SequentialScan - Indicates that the file is to be accessed sequentially from beginning to end. WriteThrough - Indicates that the system should write through any intermediate cache and go directly to disk. Asynchronous FileStream Copy using System. File Class - Instantiating FileStreams While a FileStream can be instantiated with FileStream constructors, they can also be instantiated in a simpler fashion using the following File class static methods: Create path File is created if it does not already exist.

If file does exist and it is not read-only, the content is completely removed. FileStream has a default FileShare value of None. FileStream has the default 4K buffer size. OpenWrite - write-only access opens an existing file or creates a new file for writing.

OpenWrite path File is created if it does not already exist. If file does exist and it is not read-only, the content is left intact and the file pointer is positioned to the beginning of the file. If fewer bytes are subsequently written than exists in the file, then the file contains a mixture of the old and new content. OpenRead - read only access opens an existing file for reading.

So as a general rule: File - static methods for working with files. Static Methods AppendAllLines - appends lines to a file, and then closes the file. If the specified file does not exist, this method creates a file, writes the specified lines to the file, and then closes the file. AppendText - creates a StreamWriter that appends UTF-8 encoded text to an existing file, or to a new file if the specified file does not exist.

CreateText - creates or opens a file for writing UTF-8 encoded text. Decrypt - decrypts a file that was encrypted by the current account using the Encrypt method. Encrypt - encrypts a file so that only the account used to encrypt the file can decrypt it. Exists - determines whether the specified file exists. GetAttributes - gets the FileAttributes of the file on the path.

ReadAllBytes - opens a binary file, reads the contents of the file into a byte array, and then closes the file. ReadAllLines - opens a text file, reads all lines of the file, and then closes the file. ReadAllText - opens a text file, reads all lines of the file, and then closes the file. ReadLines - reads the lines of a file. Replace - replaces the contents of a specified file with the contents of another file, deleting the original file, and creating a backup of the replaced file.

WriteLine fileContents ; FileInfo - instance methods and properties for working with files. Properties Attributes - gets or sets the attributes for the current file or directory. Directory - gets an instance of the parent directory. DirectoryName - gets a string representing the directory's full path. Exists - gets a value indicating whether a file exists. Extension - gets the string representing the extension part of the file. FullName - gets the full path of the directory or file.

IsReadOnly - gets or sets a value that determines if the current file is read only. Length - gets the size, in bytes, of the current file. CopyTo String, Boolean - copies an existing file to a new file, allowing the overwriting of an existing file. CreateText - creates a StreamWriter that writes a new text file.

MoveTo - moves a specified file to a new location, providing the option to specify a new file name. Refresh - refreshes the state of the object. Replace String, String - replaces the contents of a specified file with the file described by the current FileInfo object, deleting the original file, and creating a backup of the replaced file.

Directory - static methods for working with directories. Static Methods CreateDirectory String - creates all directories and subdirectories in the specified path unless they already exist. EnumerateDirectories String - returns an enumerable collection of directory names in a specified path. EnumerateFiles String - returns an enumerable collection of file names in a specified path. EnumerateFileSystemEntries String - returns an enumerable collection of file names and directory names that match a search pattern in a specified path.

Exists - determines whether the given path refers to an existing directory on disk. GetAccessControl String - gets a DirectorySecurity object that encapsulates the specified type of access control list ACL entries for a specified directory. GetDirectories String - returns the names of subdirectories including their paths that match the specified search pattern in the specified directory. GetDirectoryRoot - returns the volume information, root information, or both for the specified path.

GetFiles String - returns the names of files including their paths in the specified directory. GetFileSystemEntries String - returns the names of all files and subdirectories in a specified path. GetLogicalDrives - retrieves the names of the logical drives on this computer in the form ": Move - moves a file or a directory and its contents to a new location. DirectoryInfo - instance methods and properties for working with directories. Exists - gets a value indicating whether the directory exists.

Name - gets the name of this DirectoryInfo instance. Parent - gets the parent directory of a specified subdirectory. Root - gets the root portion of the directory. Instance Methods Create - creates a directory. CreateSubdirectory String - creates a subdirectory or subdirectories on the specified path. EnumerateDirectories - returns an enumerable collection of directory information that matches a specified search pattern EnumerateFiles - returns an enumerable collection of file information in the current directory.

EnumerateFileSystemInfos - returns an enumerable collection of file information that matches a specified search pattern and search subdirectory option. MoveTo - moves a DirectoryInfo instance and its contents to a new path. Below are some of the static methods found in the Path class Path - static methods for working with path strings. Static Methods ChangeExtension - changes the extension of a path string. Combine String[] - combines an array of strings into a path.

GetDirectoryName - returns the directory information for the specified path string. GetFileNameWithoutExtension - returns the file name of the specified path string without the extension. GetInvalidFileNameChars - gets an array containing the characters that are not allowed in file names.

GetInvalidPathChars - gets an array containing the characters that are not allowed in path names. GetRandomFileName - returns a random folder name or file name. HasExtension - determines whether a path includes a file name extension. IsPathRooted - gets a value indicating whether the specified path string contains a root.

Desktop - the logical Desktop rather than the physical file system location. Favorites - the directory that serves as a common repository for the user's favorite items.

MyComputer - the My Computer folder. The MyComputer constant always yields the empty string "" because no path is defined for the My Computer folder. MyMusic - the My Music folder. MyDocuments - the My Documents folder.