好奇是否有人可以帮助我？
我确实有一个应用程序可以将数据上传/下载到表中。将数据写入表没有问题。阅读是个问题。
这是我所拥有的：
首先是我的课：
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
我只是不明白，为什么我可以将 NewRecord 写入表，但我不能从表中读取它到同一个 CloudNewRecord 类？我在 VB.net 中找不到任何好的示例。
任何帮助表示赞赏。