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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      • vb.net教程之數據的綁定

      • 2015-01-25 10:17 來源:未知

      數據的綁定(相關vb.net教程)

      VB.NET沒有自己的類庫,它依托的是.NET FrameWork SDK中的類庫,雖然在.NET FrameWrok SDK中并沒有提供在VB中的的DbLabelDbComboBox等數據庫組件,但.NET FrameWork SDK中提供了一種數據綁定技術,可以把打開的數據表中的某個或者某些字段綁定到在命名空間System.Window.Forms中定義的 WinForm組件(TextBox組件、ComboBox組件、Label組件等)中的某些屬性上,從而提供這些組件顯示出數據表中的記錄信息,也就實現了DbTextBoxDbComboBox等組件。

      ()數據綁定和Windows窗體基礎知識

      數據綁定指的是一個過程,即在運行時自動為包含數據的結構中的一個或多個窗體控件設置屬性的過程。具體而言,是指Windows窗體使用ADO.NET進行數據綁定的過程。使用數據綁定,你無需顯式編寫實例化連接和創建數據集的代碼(而使用非綁定窗體則必須這樣做),與Windows窗體相關聯的向導將為你編寫必要的ADO.NET代碼。

      Windows窗體使用戶可以輕松綁定到幾乎所有包含數據的結構。這表示用戶可以使用ADO.NET綁定到傳統的數據存儲區(如存儲在Access SQL Server表中的數據),也可以綁定到從文件讀取的、包含在其他控件的或存儲在陣列中的數據結果。將窗體綁定到數據后,就可以將窗體上的控件綁定到特定的數據元素。最傳統的數據綁定包括將文本框控件(TextBox)Text屬性綁定到數據源的列,還可以綁定Image控件的圖形、控件的背景或窗體上任意控件的其他任意屬性。

      Windows窗體可以進行兩種類型的數據綁定:簡單數據綁定允許將控件綁定到單個數據元素;復雜數據綁定允許將多個數據元素綁定到一個控件。

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