If you give me one, I know I've filled one String Of MemoryStream , how can I retrieve a String?

#1 building

Previous solutions didn't work when it came to coding. It's - a "real life" - like how to do it right

using(var stream = new System.IO.MemoryStream())
{
  var serializer = new DataContractJsonSerializer(typeof(IEnumerable<ExportData>),  new[]{typeof(ExportData)}, Int32.MaxValue, true, null, false);               
  serializer.WriteObject(stream, model);  


  var jsonString = Encoding.Default.GetString((stream.ToArray()));
}

#2 building

This example shows how to read and write strings of MemoryStream.

Imports System.IO

Module Module1
  Sub Main()
    ' We don't need to dispose any of the MemoryStream 
    ' because it is a managed object. However, just for 
    ' good practice, we'll close the MemoryStream.
    Using ms As New MemoryStream
      Dim sw As New StreamWriter(ms)
      sw.WriteLine("Hello World")
      ' The string is currently stored in the 
      ' StreamWriters buffer. Flushing the stream will 
      ' force the string into the MemoryStream.
      sw.Flush()
      ' If we dispose the StreamWriter now, it will close 
      ' the BaseStream (which is our MemoryStream) which 
      ' will prevent us from reading from our MemoryStream
      'sw.Dispose()

      ' The StreamReader will read from the current 
      ' position of the MemoryStream which is currently 
      ' set at the end of the string we just wrote to it. 
      ' We need to set the position to 0 in order to read 
      ' from the beginning.
      ms.Position = 0
      Dim sr As New StreamReader(ms)
      Dim myStr = sr.ReadToEnd()
      Console.WriteLine(myStr)

      ' We can dispose our StreamWriter and StreamReader 
      ' now, though this isn't necessary (they don't hold 
      ' any resources open on their own).
      sw.Dispose()
      sr.Dispose()
    End Using

    Console.WriteLine("Press any key to continue.")
    Console.ReadKey()
  End Sub
End Module

#3 building

You can also use

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

I don't think it's efficient, but I can't swear. It also allows you to choose a different encoding, which must be specified as a parameter when using StreamReader.

#4 building

Brian's answer is slightly modified to allow optional read start management, which seems to be the easiest way. May not be the most effective, but easy to understand and use.

Public Function ReadAll(ByVal memStream As MemoryStream, Optional ByVal startPos As Integer = 0) As String
    ' reset the stream or we'll get an empty string returned
    ' remember the position so we can restore it later
    Dim Pos = memStream.Position
    memStream.Position = startPos

    Dim reader As New StreamReader(memStream)
    Dim str = reader.ReadToEnd()

    ' reset the position so that subsequent writes are correct
    memStream.Position = Pos

    Return str
End Function

#5 building

In this case, if you really want to use the ReadToEnd method in MemoryStream in a simple way, you can use this extension method to do this:

public static class SetExtensions
{
    public static string ReadToEnd(this MemoryStream BASE)
    {
        BASE.Position = 0;
        StreamReader R = new StreamReader(BASE);
        return R.ReadToEnd();
    }
}

And you can use this method in the following ways:

using (MemoryStream m = new MemoryStream())
{
    //for example i want to serialize an object into MemoryStream
    //I want to use XmlSeralizer
    XmlSerializer xs = new XmlSerializer(_yourVariable.GetType());
    xs.Serialize(m, _yourVariable);

    //the easy way to use ReadToEnd method in MemoryStream
    MessageBox.Show(m.ReadToEnd());
}

#6 building

Why not create a good extension method on the MemoryStream type?

public static class MemoryStreamExtensions
{

    static object streamLock = new object();

    public static void WriteLine(this MemoryStream stream, string text, bool flush)
    {
        byte[] bytes = Encoding.UTF8.GetBytes(text + Environment.NewLine);
        lock (streamLock)
        {
            stream.Write(bytes, 0, bytes.Length);
            if (flush)
            {
                stream.Flush();
            }
        }
    }

    public static void WriteLine(this MemoryStream stream, string formatString, bool flush, params string[] strings)
    {
        byte[] bytes = Encoding.UTF8.GetBytes(String.Format(formatString, strings) + Environment.NewLine);
        lock (streamLock)
        {
            stream.Write(bytes, 0, bytes.Length);
            if (flush)
            {
                stream.Flush();
            }
        }
    }

    public static void WriteToConsole(this MemoryStream stream)
    {
        lock (streamLock)
        {
            long temporary = stream.Position;
            stream.Position = 0;
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8, false, 0x1000, true))
            {
                string text = reader.ReadToEnd();
                if (!String.IsNullOrEmpty(text))
                {
                    Console.WriteLine(text);
                }
            }
            stream.Position = temporary;
        }
    }
}

Of course, be careful when using these methods in combination with standard methods. :)... If you do, you need to use that convenient streamLock for concurrency.

#7 building

This example shows how to read a string from a MemoryStream, where I used serialization (using DataContractJsonSerializer), passed the string from a server to the client, then recovered the MemoryStream from the string passed as a parameter, and then deserialized the MemoryStream.

I used parts of different posts to perform this example.

I hope it will help.

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Threading;

namespace JsonSample
{
    class Program
    {
        static void Main(string[] args)
        {
            var phones = new List<Phone>
            {
                new Phone { Type = PhoneTypes.Home, Number = "28736127" },
                new Phone { Type = PhoneTypes.Movil, Number = "842736487" }
            };
            var p = new Person { Id = 1, Name = "Person 1", BirthDate = DateTime.Now, Phones = phones };

            Console.WriteLine("New object 'Person' in the server side:");
            Console.WriteLine(string.Format("Id: {0}, Name: {1}, Birthday: {2}.", p.Id, p.Name, p.BirthDate.ToShortDateString()));
            Console.WriteLine(string.Format("Phone: {0} {1}", p.Phones[0].Type.ToString(), p.Phones[0].Number));
            Console.WriteLine(string.Format("Phone: {0} {1}", p.Phones[1].Type.ToString(), p.Phones[1].Number));

            Console.Write(Environment.NewLine);
            Thread.Sleep(2000);

            var stream1 = new MemoryStream();
            var ser = new DataContractJsonSerializer(typeof(Person));

            ser.WriteObject(stream1, p);

            stream1.Position = 0;
            StreamReader sr = new StreamReader(stream1);
            Console.Write("JSON form of Person object: ");
            Console.WriteLine(sr.ReadToEnd());

            Console.Write(Environment.NewLine);
            Thread.Sleep(2000);

            var f = GetStringFromMemoryStream(stream1);

            Console.Write(Environment.NewLine);
            Thread.Sleep(2000);

            Console.WriteLine("Passing string parameter from server to client...");

            Console.Write(Environment.NewLine);
            Thread.Sleep(2000);

            var g = GetMemoryStreamFromString(f);
            g.Position = 0;
            var ser2 = new DataContractJsonSerializer(typeof(Person));
            var p2 = (Person)ser2.ReadObject(g);

            Console.Write(Environment.NewLine);
            Thread.Sleep(2000);

            Console.WriteLine("New object 'Person' arrived to the client:");
            Console.WriteLine(string.Format("Id: {0}, Name: {1}, Birthday: {2}.", p2.Id, p2.Name, p2.BirthDate.ToShortDateString()));
            Console.WriteLine(string.Format("Phone: {0} {1}", p2.Phones[0].Type.ToString(), p2.Phones[0].Number));
            Console.WriteLine(string.Format("Phone: {0} {1}", p2.Phones[1].Type.ToString(), p2.Phones[1].Number));

            Console.Read();
        }

        private static MemoryStream GetMemoryStreamFromString(string s)
        {
            var stream = new MemoryStream();
            var sw = new StreamWriter(stream);
            sw.Write(s);
            sw.Flush();
            stream.Position = 0;
            return stream;
        }

        private static string GetStringFromMemoryStream(MemoryStream ms)
        {
            ms.Position = 0;
            using (StreamReader sr = new StreamReader(ms))
            {
                return sr.ReadToEnd();
            }
        }
    }

    [DataContract]
    internal class Person
    {
        [DataMember]
        public int Id { get; set; }
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public DateTime BirthDate { get; set; }
        [DataMember]
        public List<Phone> Phones { get; set; }
    }

    [DataContract]
    internal class Phone
    {
        [DataMember]
        public PhoneTypes Type { get; set; }
        [DataMember]
        public string Number { get; set; }
    }

    internal enum PhoneTypes
    {
        Home = 1,
        Movil = 2
    }
}

#8 building

byte[] array = Encoding.ASCII.GetBytes("MyTest1 - MyTest2");
MemoryStream streamItem = new MemoryStream(array);

// convert to string
StreamReader reader = new StreamReader(streamItem);
string text = reader.ReadToEnd();

#9 building

Use StreamReader , you can then use the ReadToEnd Method.

#10 building

Use StreamReader to convert MemoryStream to String.

<Extension()> _
Public Function ReadAll(ByVal memStream As MemoryStream) As String
    ' Reset the stream otherwise you will just get an empty string.
    ' Remember the position so we can restore it later.
    Dim pos = memStream.Position
    memStream.Position = 0

    Dim reader As New StreamReader(memStream)
    Dim str = reader.ReadToEnd()

    ' Reset the position so that subsequent writes are correct.
    memStream.Position = pos

    Return str
End Function