Operation of C # IO stream

The operation of the C # IO stream is very important, and we use this technique for reading and writing files, which shows an example of a file content copy, briefly explaining IO operations in C #.

namespaceconsoleapplication1{classProgram {Static voidMain (string[] args) {            //read the contents of a file into a streamStream stream = File.Open ("Test.txt", FileMode.OpenOrCreate); //initialize an array of bytes            byte[] bytes =New byte[(int) stream.            Length]; //reads a stream into a byte arrayStream. Read (Bytes,0, Bytes.            Length); //Receive with MemoryStreamMemoryStream ms =NewMemoryStream (bytes); //set from StartMs. Seek (0, Seekorigin.begin); //and write the returned MemoryStream to another file .Ms. WriteTo (NewFileStream ("NewFile.txt", FileMode.OpenOrCreate)); }    }}

Stream is an abstract class, while MemoryStream and FileStream are subclasses of Sream.

The following example demonstrates the asynchronous way to read the contents of a txt text.

namespaceconsoleapplication1{classProgram {Static voidMain (string[] args) {Console.WriteLine (Gettxt ().        Result); }        /// <summary>        ///Read txt text content asynchronously/// </summary>        /// <returns></returns>         Public Static Asynctask<string>Gettxt () {using(Stream stream = File.Open ("Test.txt", FileMode.OpenOrCreate)) {                using(StreamReader sr =NewStreamReader (Stream, Encoding.default)) {                    return awaitSr.                Readtoendasync (); }            }        }    }}

For more classes and operations on Io Please refer to: Https://msdn.microsoft.com/zh-cn/library/system.io (v=vs.110). aspx.

Operation of C # IO stream