alex.s alex.s - 2 months ago 7
Vb.net Question

Azure Tables Retrieving/Casting Data Issue

Curious if someone could help me?

I do have an app that suppose to upload/download data to the table. No problem writing data to the table. Reading is the problem.

Here is what I have:

First is my Class:

Imports Microsoft.WindowsAzure.Storage.Table

Public Class TimeRecord
Inherits Microsoft.WindowsAzure.Storage.Table.TableEntity
Implements Microsoft.WindowsAzure.Storage.Table.ITableEntity

Private _Project1 As String

Public Property Project1 As String
Get
Return _Project1
End Get
Set(ByVal value As String)
_Project1 = value
End Set
End Property


Public Property Data As String
Public Property Category1 As String
Public Property Description1 As String
Public Property HRS1 As String
Public Property MINS1 As String

Public Property Project2 As String
Public Property Category2 As String
Public Property Description2 As String
Public Property HRS2 As String
Public Property MINS2 As String


end class

'next is the Upload, which is working fine and uploading all data to the table

Public NewRecord As New TimeRecord
Public CloudNewRecord As New TimeRecord

' Finishing and uploading
Private Sub Button_Finish_Click(sender As Object, e As EventArgs) Handles Button_Finish.Click

Call VariableAssign() ' that is where we assigning data to NewRecord.xxx="blah blah" etc

Dim accountname As String = "projects"
Dim accountkey As String = My.Settings.StorageKey
Dim creds As StorageCredentials = New StorageCredentials(accountname, accountkey)
Dim account As CloudStorageAccount = New CloudStorageAccount(creds, useHttps:=True)
Dim client As CloudTableClient = account.CreateCloudTableClient()
Dim table As CloudTable = client.GetTableReference("tdb")

table.CreateIfNotExists()

NewRecord.Data = _date
NewRecord.PartitionKey = ComboBox1.SelectedItem
NewRecord.RowKey = NewRecord.Data

' Magically we write data to the cloud in Minesota
Dim insertoperation As TableOperation
insertoperation = TableOperation.InsertOrReplace(NewRecord)
table.Execute(insertoperation)

Call TimeCounter()
exSubUpload = False
End Sub


' **here is where I do have a problem casting**.... **I think I`m missing something in the Class declaration**

' Retrieve from cloud
Private Sub RetrieveFromCloud()
'Try

Dim accountname As String = "projects"
Dim accountkey As String = My.Settings.StorageKey
Dim creds As StorageCredentials = New StorageCredentials(accountname, accountkey)
Dim account As CloudStorageAccount = New CloudStorageAccount(creds, useHttps:=True)
Dim client As CloudTableClient = account.CreateCloudTableClient()
Dim table As CloudTable = client.GetTableReference("tdb")

Dim retrieveOperation As TableOperation
Dim retrievedResult As TableResult

retrieveOperation = TableOperation.Retrieve(ComboBox1.SelectedItem, _date)
' it does retrieve all data and keep it in retrievedResult

retrievedResult = table.Execute(retrieveOperation)

**' that is I`m having problems - probably lack of knowledge/understanding - of how to cast all the data back to the class.**
CloudNewRecord = retrievedResult.Result
Debug.Print(CloudNewRecord.Project1)


End Sub


I just don't understand, why I can write the NewRecord to the table, but I can't read it from the table to the same CloudNewRecord Class?
I couldn't find any good examples in VB.net.

Any help is appreciated.

Answer

GOT IT!!!!

    Dim retrieveOperation As TableOperation
    Dim retrievedResult As TableResult

    retrieveOperation = TableOperation.Retrieve(Of TimeRecord)(ComboBox1.SelectedItem, _date)
    retrievedResult = table.Execute(retrieveOperation)

    Debug.Print(DirectCast(retrievedResult.Result, TimeRecord).Project1)