主要是繼承原有TextBox；追加編號內容（ValueText）和顯示內容（DisplayText）；在編輯完成后查詢數據庫調出DisplayText（如：名稱）；并顯示在原TextBox中；當TextBox為編輯狀態是顯示ValueText(如：編號)

當然還可以進一步增強；如：增加對于的數據字典、增加DataRow所有數據（便于開發時根據記錄集更新其他組件）等等

運行效果如下圖

主要代碼:

1.繼承組件

public partial class TTextBox : Infragistics.Win.UltraWinEditors.UltraTextEditor

2.定義屬性

private string displayMember;public string DisplayMember { get { return displayMember; } set { displayMember = value; } }private string valueMember;public string ValueMember { get { return valueMember; } set { valueMember = value; } }private int max_Length;public int Max_Length { get { return max_Length; } set { max_Length = value; } }

3.原始原組件事件；并追加代碼

protected override void OnEndInit(){base.OnEndInit();max_Length = base.MaxLength;}protected override void OnBeforeEnterEditMode(CancelEventArgs e){base.OnBeforeEnterEditMode(e);if (valueMember == null)valueMember = "";if (max_Length != null && max_Length != 0)base.MaxLength = max_Length;base.Value = valueMember;}protected override void OnEnter(EventArgs e){base.OnEnter(e);base.SelectAll();}protected override void OnAfterExitEditMode(EventArgs e){base.OnAfterExitEditMode(e);if (displayMember == null)displayMember = "";base.MaxLength = 0;base.Value = displayMember;} protected override void OnValueChanged(EventArgs e){base.OnValueChanged(e);if (base.Value == null)return;valueMember = base.Value.ToString();//maxLength = base.MaxLength;DisplayMember = GetValue("select Name from Table"); if (DisplayMember == "")valueMember = "";elseDisplayMember = DisplayMember+ "(" + valueMember + ")";}

運行效果如下圖:

轉載于:https://www.cnblogs.com/DesignIvan/archive/2013/05/31/CustControl.html

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