Read and write files using FileStream objects

In the project development often involves to read and write to the file, C # provides many ways to read and write to the file, today said FileStream object.
FileStream represents a stream that points to a file on a disk or network path. General operations files are used to StreamReader and StreamWriter because they manipulate character data. Instead, the FileStream object operates on a byte and byte array. Some operations must be performed using the FileStream object, such as randomly accessing data at a point in the middle of a file.
There are many different ways to create FileStream objects, which are created using file names and FileMode enumeration values:
One, read the file, remember to refer to the System.IO namespace:

usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.IO;namespaceconsoleapplicationtest{classProgram {Static voidMain (string[] args) {            //create a byte array and a character array for the data you want to read            byte[] Bytedata =New byte[ $]; Char[] Chardata =New Char[ $]; //Catch Exception: Easy exception when manipulating files, preferably with try CatchFileStream file =NULL; Try            {                //opens a current Program.cs file, at which point a pointer to a read-write file (or an action cursor) points to the beginning of the fileFile =NewFileStream (@".. \.. \program.cs", FileMode.Open); //read-write pointer moves backward 10 bytes from the beginningFile. Seek (Ten, Seekorigin.begin); //reads 200 bytes of data into a byte array from the position of the current read-write pointerFile. Read (Bytedata,0, $); }Catch(Exception e) {Console.WriteLine ("Read File exception: {0}", E); }            finally            {                //Close File Stream                if(File! =NULL) file.            Close (); }            //Create an Encoding converter decoderDecoder Decoder =Encoding.UTF8.GetDecoder (); //convert a byte array to a character arrayDecoder. GetChars (Bytedata,0, $, Chardata,0);            Console.WriteLine (Chardata);        Console.readkey (); }}}

The results appear as follows:

Second, write the file:

usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.IO;namespaceconsoleapplicationtest{classProgram {Static voidMain (string[] args) {            byte[] bytedata; Char[] chardata; FileStream file=NULL; Try            {                //Create a Aa.txt file under the current startup directoryFile =NewFileStream ("Aa.txt", FileMode.Create); //Convert "Test write text to file" into a character array and put it into chardataChardata ="Test Write text to file".                ToCharArray (); Bytedata=New byte[Chardata.length]; //Create an encoder to convert characters to bytesEncoder Encoder =Encoding.UTF8.GetEncoder (); Encoder. GetBytes (Chardata,0, Chardata.length, Bytedata,0,true); File. Seek (0, Seekorigin.begin); //writing data to a fileFile. Write (Bytedata,0, bytedata.length); }Catch(Exception e) {Console.WriteLine ("Write file exception: {0}", E); }            finally            {                if(File! =NULL) file.            Close ();        } console.readkey (); }    }}

The results are as follows:

Read and write files using FileStream objects