How do you get a string from a MemoryStream

Question

If I am given a MemoryStream that I know has been populated with a String  how do I get a String back out

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You can also use  Encoding ASCII GetString ms ToArray       I don t think this is less efficient  but I couldn t swear to it   It also lets you choose a different encoding  whereas using a StreamReader you d have to specify that as a parameter

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Previous solutions wouldn t work in cases where encoding is involved  Here is - kind of a  real life  - example how to do this properly      using var stream   new System IO MemoryStream        var serializer   new DataContractJsonSerializer typeof IEnumerable lt ExportData gt     new   typeof ExportData    Int32 MaxValue  true  null  false                    serializer WriteObject stream  model         var jsonString   Encoding Default GetString  stream ToArray

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This sample shows how to read and write a string to a 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

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A slightly modified version of Brian s answer allows optional management of read start  This seems to be the easiest method   probably not the most efficient  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

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You can also use  Encoding ASCII GetString ms ToArray       I don t think this is less efficient  but I couldn t swear to it   It also lets you choose a different encoding  whereas using a StreamReader you d have to specify that as a parameter

User · Answer

use a StreamReader  then you can use the ReadToEnd method that returns a string

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This sample shows how to read a string from a MemoryStream  in which I ve used a serialization  using DataContractJsonSerializer   pass the string from some server to client  and then  how to recover the MemoryStream from the string passed as parameter  then  deserialize the MemoryStream   I ve used parts of different posts to perform this sample   Hope that this helps   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 lt Phone gt                                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 lt Phone gt  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

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A slightly modified version of Brian s answer allows optional management of read start  This seems to be the easiest method   probably not the most efficient  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

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byte   array   Encoding ASCII GetBytes  MyTest1 - MyTest2    MemoryStream streamItem   new MemoryStream array       convert to string StreamReader reader   new StreamReader streamItem   string text   reader ReadToEnd

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Using a StreamReader to convert the MemoryStream to a String    lt Extension   gt    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

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Using a StreamReader to convert the MemoryStream to a String    lt Extension   gt    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

User · Answer

use a StreamReader  then you can use the ReadToEnd method that returns a string

User · Answer

Using a StreamReader to convert the MemoryStream to a String    lt Extension   gt    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

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use a StreamReader  then you can use the ReadToEnd method that returns a string

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In this case  if you really want to use ReadToEnd method in MemoryStream in an easy way  you can use this Extension Method to achieve 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 this way  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

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This sample shows how to read and write a string to a 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

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byte   array   Encoding ASCII GetBytes  MyTest1 - MyTest2    MemoryStream streamItem   new MemoryStream array       convert to string StreamReader reader   new StreamReader streamItem   string text   reader ReadToEnd

User · Answer

You can also use  Encoding ASCII GetString ms ToArray       I don t think this is less efficient  but I couldn t swear to it   It also lets you choose a different encoding  whereas using a StreamReader you d have to specify that as a parameter

User · Answer

Why not make a nice 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 conjunction with the standard ones        you ll need to use that handy streamLock if you do  for concurrency

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Previous solutions wouldn t work in cases where encoding is involved  Here is - kind of a  real life  - example how to do this properly      using var stream   new System IO MemoryStream        var serializer   new DataContractJsonSerializer typeof IEnumerable lt ExportData gt     new   typeof ExportData    Int32 MaxValue  true  null  false                    serializer WriteObject stream  model         var jsonString   Encoding Default GetString  stream ToArray

User · Answer

Only use method Convert ToBase64String Convert ToBase64String inputStream ToArray

User · Answer

Why not make a nice 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 conjunction with the standard ones        you ll need to use that handy streamLock if you do  for concurrency

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Using a StreamReader to convert the MemoryStream to a String    lt Extension   gt    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

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This sample shows how to read a string from a MemoryStream  in which I ve used a serialization  using DataContractJsonSerializer   pass the string from some server to client  and then  how to recover the MemoryStream from the string passed as parameter  then  deserialize the MemoryStream   I ve used parts of different posts to perform this sample   Hope that this helps   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 lt Phone gt                                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 lt Phone gt  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

User · Answer

You can also use  Encoding ASCII GetString ms ToArray       I don t think this is less efficient  but I couldn t swear to it   It also lets you choose a different encoding  whereas using a StreamReader you d have to specify that as a parameter

User · Answer

use a StreamReader  then you can use the ReadToEnd method that returns a string

User · Answer

I need to integrate with a class that need a Stream to Write on it   XmlSchema schema         Use  schema       var ret        using  var ms   new MemoryStream          schema Write ms       ret   Encoding ASCII GetString ms ToArray         here you can use  ret     6 Lines of code   I create a simple class that can help to reduce lines of code for multiples use   public static class MemoryStreamStringWrapper       public static string Write Action lt MemoryStream gt  action                var ret               using  var ms   new MemoryStream                          action ms               ret   Encoding ASCII GetString ms ToArray                        return ret            then you can replace the sample with a single line of code   var ret   MemoryStreamStringWrapper Write schema Write

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In this case  if you really want to use ReadToEnd method in MemoryStream in an easy way  you can use this Extension Method to achieve 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 this way  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

User · Answer

Only use method Convert ToBase64String Convert ToBase64String inputStream ToArray

User · Answer

I need to integrate with a class that need a Stream to Write on it   XmlSchema schema         Use  schema       var ret        using  var ms   new MemoryStream          schema Write ms       ret   Encoding ASCII GetString ms ToArray         here you can use  ret     6 Lines of code   I create a simple class that can help to reduce lines of code for multiples use   public static class MemoryStreamStringWrapper       public static string Write Action lt MemoryStream gt  action                var ret               using  var ms   new MemoryStream                          action ms               ret   Encoding ASCII GetString ms ToArray                        return ret            then you can replace the sample with a single line of code   var ret   MemoryStreamStringWrapper Write schema Write

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