I发现流是在最后，我将必须将其设置为开头

  Dim  InStream  As  Stream 
 Dim  Len  As   Integer  
 InStream = HttpContext.Current.Request.InputStream 
 InStream =  CType （InStream，Stream）
 Len =  CInt （InStream.Length）
 Dim  ByteArray（Len）作为 字节 
 InStream.Seek（ 0 ，SeekOrigin。开始跨度>）; 
 InStream.Read（ByteArray， 0 ，Len）
 Dim  jsonParam  As   String  
 jsonParam = System.Text.Encoding.UTF8.GetString（ByteArray）

for a web API in MVC 4 i'm trying to get the input stream of a http resquest post in the controller i'm always getting the length of the byte array = 53 but the byte array is empty so when i convert it to string i keep getting an empty string

this is what i'm using:

Dim InStream As Stream
Dim Len As Integer
InStream = HttpContext.Current.Request.InputStream
InStream = CType(InStream, Stream)
Len = CInt(InStream.Length)
Dim ByteArray(Len) As Byte
InStream.Read(ByteArray, 0, Len)
Dim jsonParam As String
jsonParam = System.Text.Encoding.UTF8.GetString(ByteArray)

i think it's from this line :

InStream = HttpContext.Current.Request.InputStream

but i did not find how to replace it

note that the string the client is sending is a JSON string

any help?

I found that the stream is at the end, i will have to set it to the beginning

Dim InStream As Stream
Dim Len As Integer
InStream = HttpContext.Current.Request.InputStream
InStream = CType(InStream, Stream)
Len = CInt(InStream.Length)
Dim ByteArray(Len) As Byte
InStream.Seek(0, SeekOrigin.Begin);
InStream.Read(ByteArray, 0, Len)
Dim jsonParam As String
jsonParam = System.Text.Encoding.UTF8.GetString(ByteArray)