Memory stream cannot read stream

Hei, i have this custom nested dictionary to stream:

Code (CSharp):

1.  
2.         public static Stream tostreamsmall(h.d3 inputdict)
3.         {
4.             string d3key = ""; string d2key = ""; string nullv="";
5.             using (var stream = new MemoryStream())
6.             using (var writer = new StreamWriter(stream)) {
7.                 foreach (var keyaaa in inputdict) {
8.                     d3key = keyaaa.Key;
9.                     foreach (var keyaa in keyaaa.Value) {
10.                         d2key = keyaa.Key;
11.                         foreach (var keya in keyaa.Value) {
12.                             if (d3key != keyaaa.Key) { writer.WriteLine(keyaaa.Key); d3key = keyaaa.Key; }
13.                             else writer.WriteLine(nullv);
14.                             if (d2key != keyaa.Key) { writer.WriteLine(keyaa.Key); d2key = keyaa.Key; }
15.                             else writer.WriteLine(nullv);
16.                             writer.WriteLine(keya.Key);
17.                             writer.WriteLine(keya.Value);
18.                         }
19.                     }
20.                 }
21.                 writer.Flush();
22.                 stream.Position = 0;
23.                 return stream;
24.             }
25.         }
26.  
27.         public static h.d3 tohd3(Stream inputstream)
28.         {
29.             string d3key = ""; string d2key = "";
30.             h.d3 dico = new h.d3();
31.             pre( "inpuistreamlenght "+inputstream.ToString().Count());
32.             pre("inpuistream " + inputstream.ToString());
33.             //using (var stream = new MemoryStream(inputstream))
34.             using (var reader = new StreamReader(inputstream)) {
35.                 while (inputstream.Position < inputstream.Length) {
36.                     var keyaaa = reader.ReadLine();
37.                     var keyaa = reader.ReadLine();
38.                     var keya = reader.ReadLine();
39.                     var value = reader.ReadLine();
40.                     if (keyaaa != "") { d3key = keyaaa; }
41.                     if (keyaa != "") { d2key = keyaa; }
42.                     dico.makeserialize(d3key, d2key, keya, value);
43.                 }
44.             }
45.             dico.makeserializefinish();
46.             return dico;
47.         }

Which is shorted with all not relevant lines cut:

Code (CSharp):

1.  
2.         public static Stream tostreamsmall(h.d3 inputdict)
3.         {
4.             using (var stream = new MemoryStream())
5.             using (var writer = new StreamWriter(stream)) {
6.  
7.                 writer.Flush();
8.                 stream.Position = 0;
9.                 return stream;
10.             }
11.         }
12.  
13.         public static h.d3 tohd3(Stream inputstream)
14.         {
15.  
16.             using (var reader = new StreamReader(inputstream))
17.  

However i always get an error in tohd3 in this line: using (var reader = new StreamReader(inputstream)) { :

 

I found my answer: I took the base code from the internet and the using statements seemed to dispose the stream.

 

The using statement:
https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/using-statement

Effectively it ensures IDisposable.Dispose is called on the 'used' object at the end of its closure.

In the case of a 'Stream', Dispose closes the stream.

 

Yes i found it out after being bugged a while but it was not all. MemoryStreams are disposed automatically themselfs i had to avoid this too.