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Lecture d'un document JSON "source.json" par flux de fichiers mais comment obtenir les données du fichier json? Après cela, j'essaie d'ajouter les données json nouvellement éditées sur le même fichier.Filestream et recevoir les données de la lecture
Dim pathSource As String = "Server.MapPath('~/source.json')"
Try
Using fs As FileStream = New FileStream(pathSource, _
FileMode.Open, FileAccess.Read)
Dim bytes() As Byte = New Byte((fsSource.Length) - 1) {}
Dim numBytesToRead As Integer = CType(fsSource.Length,Integer)
Dim numBytesRead As Integer = 0
While (numBytesToRead > 0)
Dim n As Integer = fsSource.Read(bytes, numBytesRead, _
numBytesToRead)
If (n = 0) Then
Exit While
End If
numBytesRead = (numBytesRead + n)
numBytesToRead = (numBytesToRead - n)
End While
numBytesToRead = bytes.Length
Dim xmlBuilder = New StringBuilder()
fs.Seek(0, SeekOrigin.Begin)
Dim ms As New MemoryStream()
fs.CopyTo(ms)
xmlBuilder.Append(Encoding.UTF8.GetString(ms.ToArray()))
ms.Flush()
ms.Close()
'???How to access the data from the file "source.json" you just read in???
'Edit the file "source.json" data
?? How to put it into "bytesout" the edited data???
Using fsAppend As FileStream = New FileStream(pathSource, _
FileMode.Append, FileAccess.Write)
fsAppend.Write(bytesout, 0, numBytesToRead)
End Using
End Using
Catch ioEx As FileNotFoundException
Console.WriteLine(ioEx.Message)
End Try
J'éviterais de réinventer la roue comme ça et j'utiliserais simplement json.net: http://www.newtonsoft.com/json/ help/html/ReadJson.htm – mxmissile
Je ne peux pas obtenir NewtonSoft le paquet donne une erreur. – losopha
Ensuite, utilisez ['JavaScriptSerializer'] (https://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx) ou [' DataContractJsonSerializer'] (https: // msdn. microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer.aspx). A quoi ressemble le JSON? – dbc