列表框選擇：DataRowView到類型Sting是無效的

我正在從一個數據庫填充正在填充的數據表的列表框。這是相關的代碼。列表框選擇：DataRowView到類型Sting是無效的

Private Sub frmMainMenu_Load(sender As Object, e As EventArgs) Handles MyBase.Load 
     'Load data we need from the database 
     Dim commandCraneType As New OleDbCommand("SELECT Name FROM CraneType WHERE Girders = 'Single Girder'", gConnection) 
     Dim adapterCraneType As New OleDbDataAdapter(commandCraneType) 
     Dim dTableCraneType As New DataTable() 
     'Fill datatables and controls 
     adapterCraneType.Fill(dTableCraneType) 
     lboCraneType.DataSource = dTableCraneType 
     lboCraneType.DisplayMember = "Name" 
End Sub 

Private Sub lboCraneType_SelectedIndexChanged(sender As Object, e As EventArgs) Handles lboCraneType.SelectedIndexChanged 
     'Set the gCraneType global variable! 
     gCraneType = lboCraneType.SelectedItem 
     Debug.Print(gCraneType) 
End Sub

該列表框正確填充數據庫的名稱字段中的文本值。但是，當我在列表框中選擇該項目時，調試告訴我gCraneType已被分配System ... DataRowView，並且我收到一個異常，說我不能將該類型轉換爲字符串。我不明白爲什麼名稱在列表框中正確顯示，但選擇是數據類型。

感謝所有幫助您提供:)

來源

2013-06-26 kmaz13

dTableCraneType是一個DataTable。 SelectedItem是DataRow而不是DataTable。 – Paparazzi

看看這個http://stackoverflow.com/questions/16006741/windows-forms-listbox-selecteditem-displaying-system-data-datarowview-styles和這個http://stackoverflow.com/questions/11117932/get -selecteditems-from-database-fed-listbox and this http://stackoverflow.com/questions/15428542/why-i-get-system-data-datarowview-instead-of-real-values-in-my-listbox – Chris

我應該如何改變我將gCraneType設置爲lboCraneType中所選文本的操作？ – kmaz13

變化：

Private Sub lboCraneType_SelectedIndexChanged(sender As Object, e As EventArgs) Handles lboCraneType.SelectedIndexChanged 
     'Set the gCraneType global variable! 
     gCraneType = lboCraneType.SelectedItem 
     Debug.Print(gCraneType) 
End Sub

要：

Private Sub lboCraneType_SelectedIndexChanged(sender As Object, e As EventArgs) Handles lboCraneType.SelectedIndexChanged 
     'Set the gCraneType global variable! 
     Dim drv As DataRowView = lboCraneType.SelectedItem 
     gCraneType = drv("Name").ToString 
End Sub

感謝您在commnets你的幫助。

來源

2013-06-26 18:10:02 kmaz13

列表框選擇：DataRowView到類型Sting是無效的

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