MemoryStream to file

By: Rajesh P.S.

The MemoryStream is a powerful mechanism that facilitates the creation of a stream backed by memory, enabling the representation of a pure and seamless in-memory flow of data. In essence, this stream elegantly manages data directly in the computer's memory, bypassing the need for intermediate storage on disk or network access. The utilization of memory as the backing store bestows significant advantages, primarily the remarkable speed it offers in contrast to the comparatively slower disk or network accesses.

MemoryStream

By using the MemoryStream, developers can efficiently handle data without the overhead of writing to or retrieving from physical storage, resulting in improved performance and responsiveness. This proves particularly advantageous when dealing with temporary data, in-memory data manipulation, or situations where rapid data access is essential. The seamless in-memory stream provided by the MemoryStream contributes to a more streamlined and efficient data processing experience, making it a valuable tool in a programmer's arsenal.

The following section explains :

# MemoryStream to File # MemoryStream to String

MemoryStream to FileStream

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The MemoryStream provides a powerful means to manipulate the data stored in memory directly through a byte array (byte[]), eliminating the need for interaction with files or external resources. The choice of utilizing a byte[] in this context proves highly advantageous due to its fixed size, which simplifies memory allocation and cleanup processes. Moreover, the byte[] incurs minimal overhead, primarily because it allows for direct access to the data without requiring the use of MemoryStream functions.

Save Stream to File

C# MemoryStream to a file

using System; using System.Text; using System.Windows.Forms; using System.IO; namespace WindowsFormsApplication2 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { string memString = "Memory test string !!"; // convert string to stream byte[] buffer = Encoding.ASCII.GetBytes(memString); MemoryStream ms = new MemoryStream(buffer); //write to file FileStream file = new FileStream("d:\\file.txt", FileMode.Create, FileAccess.Write); ms.WriteTo(file); file.Close(); ms.Close(); } } }

Using the byte[] in conjunction with MemoryStream, developers can efficiently handle and process data solely within the memory space, avoiding the complexities and latencies associated with file I/O or network operations. The byte array's fixed size ensures a more predictable memory management, facilitating better control over resource utilization and enabling swift cleanup when the data is no longer needed.

Save and load MemoryStream to a file

VB.Net MemoryStream to a file

Imports System.IO Imports System.Text Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim memString As String = "Memory test string !!!" ' convert string to stream Dim buffer As Byte() = Encoding.ASCII.GetBytes(memString) Dim ms As New MemoryStream(buffer) 'write to file Dim file As New FileStream("d:\file.txt", FileMode.Create, FileAccess.Write) ms.WriteTo(file) file.Close() ms.Close() End Sub End Class

Save MemoryStream to a String

The absence of the need to invoke MemoryStream functions for data manipulation results in a more lightweight and efficient implementation. This streamlined approach proves particularly beneficial when dealing with performance-critical applications or situations requiring frequent data access and modification. The following program shows how to Read from memorystream to a string. Steps follows..

StreamWriter sw = new StreamWriter(memoryStream); sw.WriteLine("Your string to Memoery");

This string is currently saved in the StreamWriters buffer. Flushing the stream will force the string whose backing store is memory (MemoryStream).

How do you get a string from a MemoryStream

Next step is to read this string from memorystream.

ms.Position = 0; StreamReader sr = new StreamReader(ms); string myStr = sr.ReadToEnd();

Serializing a memorystream object to string

The StreamReader is designed to read data from the current position of the MemoryStream. However, after writing data to the MemoryStream, the current position is set to the end of the string that was previously written. In order to read from the beginning of the data, it is necessary to reset the position of the MemoryStream to the start.

Setting the position to 0, the StreamReader will start reading from the beginning of the MemoryStream, allowing you to access and process the data that was previously written to it. This step is crucial to ensure that you read the data from the desired starting point and avoid missing any information due to the current position being at the end of the string.

Save MemoryStream to a String - C#

using System; using System.Windows.Forms; using System.IO; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { using (MemoryStream ms = new MemoryStream()) { StreamWriter sw = new StreamWriter(ms); sw.WriteLine("Hello World !!"); sw.Flush(); ms.Position = 0; StreamReader sr = new StreamReader(ms); string myStr = sr.ReadToEnd(); MessageBox.Show(myStr); } } } }

Save MemoryStream to a String - VB.Net

Imports System.IO Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Using ms As New MemoryStream() Dim sw As New StreamWriter(ms) sw.WriteLine("Hello World !!") sw.Flush() ms.Position = 0 Dim sr As New StreamReader(ms) Dim myStr As String = sr.ReadToEnd() MessageBox.Show(myStr) End Using End Sub End Class

There is another methos also help us to read from Memory stream.

Encoding.ASCII.GetString(ms.ToArray());

C# Source Code

using System; using System.Windows.Forms; using System.IO; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { using (MemoryStream ms = new MemoryStream()) { StreamWriter sw = new StreamWriter(ms); sw.WriteLine("Hello World !!!"); sw.Flush(); string myStr = Encoding.ASCII.GetString(ms.ToArray ()); MessageBox.Show(myStr); } } } }

VB.Net Source Code

Imports System.IO Imports System.Text Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Using ms As New MemoryStream() Dim sw As New StreamWriter(ms) sw.WriteLine("Hello World !!!") sw.Flush() Dim myStr As String = Encoding.ASCII.GetString(ms.ToArray()) MessageBox.Show(myStr) End Using End Sub End Class

Conclusion

The combination of MemoryStream and byte[] empowers developers to perform data operations directly in memory, sidestepping the overhead and potential bottlenecks of external resource interactions. This approach not only enhances data processing speed and efficiency but also offers greater control over memory usage and resource management, making it an optimal choice for many memory-bound scenarios.

Next > How to parse an XML file using XmlReader in C# and VB.Net

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