Difference between Stream.CopyTo and MemoryStream.WriteTo in C#

Difference between Stream.CopyTo and MemoryStream.WriteTo in C#

Both Stream.CopyTo() and MemoryStream.WriteTo() are methods in C# that allow you to copy the contents of one stream to another stream. However, there are some differences between these methods:

  1. Destination stream: Stream.CopyTo() requires a destination stream as a parameter, whereas MemoryStream.WriteTo() writes the contents of the memory stream to a specified stream.

  2. Buffer size: Stream.CopyTo() uses a default buffer size of 81920 bytes, whereas you can specify the buffer size in MemoryStream.WriteTo().

  3. Position: Stream.CopyTo() doesn't change the position of the source stream after the copy, whereas MemoryStream.WriteTo() leaves the position of the memory stream at the end of the written data.

  4. Return value: Stream.CopyTo() returns the number of bytes copied, whereas MemoryStream.WriteTo() doesn't return anything.

Here's an example of using Stream.CopyTo():

using (FileStream source = new FileStream("source.txt", FileMode.Open)) using (FileStream destination = new FileStream("destination.txt", FileMode.Create)) { source.CopyTo(destination); }

In this example, we create a FileStream object for the source file and the destination file. We then call Stream.CopyTo() on the source stream, passing the destination stream as a parameter.

Here's an example of using MemoryStream.WriteTo():

byte[] data = Encoding.UTF8.GetBytes("Hello, world!"); using (MemoryStream memoryStream = new MemoryStream(data)) using (FileStream fileStream = new FileStream("output.txt", FileMode.Create)) { memoryStream.WriteTo(fileStream); }

In this example, we create a MemoryStream object with some data in it, and a FileStream object for the output file. We then call MemoryStream.WriteTo() on the memory stream, passing the file stream as a parameter.

Examples

  1. "C# Stream.CopyTo example"

    Code Implementation:

    // Description: Using Stream.CopyTo in C# using (FileStream sourceStream = File.OpenRead("source.txt")) using (FileStream destinationStream = File.Create("destination.txt")) { sourceStream.CopyTo(destinationStream); }

  2. "C# MemoryStream.WriteTo example"

    Code Implementation:

    // Description: Using MemoryStream.WriteTo in C# byte[] data = Encoding.UTF8.GetBytes("Hello, World!"); using (MemoryStream sourceStream = new MemoryStream(data)) using (FileStream destinationStream = File.Create("output.txt")) { sourceStream.WriteTo(destinationStream); }

  3. "Difference between Stream.CopyTo and MemoryStream.WriteTo in C#"

    Code Implementation:

    // Description: Illustrating the difference between Stream.CopyTo and MemoryStream.WriteTo in C# // Using Stream.CopyTo using (FileStream sourceStream = File.OpenRead("source.txt")) using (FileStream destinationStream = File.Create("destination.txt")) { sourceStream.CopyTo(destinationStream); } // Using MemoryStream.WriteTo byte[] data = Encoding.UTF8.GetBytes("Hello, World!"); using (MemoryStream sourceStream = new MemoryStream(data)) using (FileStream destinationStream = File.Create("output.txt")) { sourceStream.WriteTo(destinationStream); }

  4. "C# Stream.CopyTo with buffer size"

    Code Implementation:

    // Description: Using Stream.CopyTo with buffer size in C# using (FileStream sourceStream = File.OpenRead("source.txt")) using (FileStream destinationStream = File.Create("destination.txt")) { byte[] buffer = new byte[4096]; int bytesRead; while ((bytesRead = sourceStream.Read(buffer, 0, buffer.Length)) > 0) { destinationStream.Write(buffer, 0, bytesRead); } }

  5. "C# MemoryStream.WriteTo with Seek"

    Code Implementation:

    // Description: Using MemoryStream.WriteTo with Seek in C# byte[] data = Encoding.UTF8.GetBytes("Hello, World!"); using (MemoryStream sourceStream = new MemoryStream(data)) using (FileStream destinationStream = File.Create("output.txt")) { sourceStream.Seek(0, SeekOrigin.Begin); sourceStream.WriteTo(destinationStream); }

  6. "C# Stream.CopyTo for network streams"

    Code Implementation:

    // Description: Using Stream.CopyTo for network streams in C# using (TcpClient client = new TcpClient("127.0.0.1", 8080)) using (NetworkStream sourceStream = client.GetStream()) using (FileStream destinationStream = File.Create("output.txt")) { sourceStream.CopyTo(destinationStream); }

  7. "C# MemoryStream.WriteTo for string data"

    Code Implementation:

    // Description: Using MemoryStream.WriteTo for string data in C# string content = "Hello, World!"; using (MemoryStream sourceStream = new MemoryStream(Encoding.UTF8.GetBytes(content))) using (FileStream destinationStream = File.Create("output.txt")) { sourceStream.WriteTo(destinationStream); }

  8. "C# Stream.CopyTo for compression"

    Code Implementation:

    // Description: Using Stream.CopyTo for compression in C# using (FileStream sourceStream = File.OpenRead("source.txt")) using (FileStream destinationStream = File.Create("compressed.gz")) using (GZipStream compressionStream = new GZipStream(destinationStream, CompressionMode.Compress)) { sourceStream.CopyTo(compressionStream); }

  9. "C# MemoryStream.WriteTo for encryption"

    Code Implementation:

    // Description: Using MemoryStream.WriteTo for encryption in C# byte[] data = Encoding.UTF8.GetBytes("Sensitive Data"); using (MemoryStream sourceStream = new MemoryStream(data)) using (FileStream destinationStream = File.Create("encrypted.dat")) using (AesCryptoServiceProvider aesCrypto = new AesCryptoServiceProvider()) { // Set up encryption parameters (key, IV, etc.) // ... using (CryptoStream cryptoStream = new CryptoStream(destinationStream, aesCrypto.CreateEncryptor(), CryptoStreamMode.Write)) { sourceStream.WriteTo(cryptoStream); } }

  10. "C# Stream.CopyTo for asynchronous operations"

    Code Implementation:

    // Description: Using Stream.CopyTo for asynchronous operations in C# using (FileStream sourceStream = File.OpenRead("source.txt")) using (FileStream destinationStream = File.Create("destination.txt")) { await sourceStream.CopyToAsync(destinationStream); }

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