Asp.net 3.5控制項和組件開發技術系列—伺服器控制項屬性(四)

來源:互聯網
上載者:User

然後定義一個編輯器,其實所有這些的編輯器功能相當於一個“橋接器”,使屬性與自訂 Form 表單關聯起來。代碼如下:

/// <summary>
/// 獲得本書更多內容,請看:
/// http://blog.csdn.net/ChengKing/archive/2008/08/18/2792440.aspx
/// </summary>

public class CalculatorSelectEditor : System.Drawing.Design.UITypeEditor
{
   public CalculatorSelectEditor()
   {

   }
   public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle
      (System.ComponentModel.ITypeDescriptorContext context)
   {
     return UITypeEditorEditStyle.Modal;
   }

   public override object EditValue(System.ComponentModel.ItypeDescriptor
     Context context,System.IServiceProvider provider,object value)
   {
     IWindowsFormsEditorService service = (IWindowsFormsEditorService)
    provider.GetService(typeof(IWindowsFormsEditorService));

     if (service == null)
     {
       return null;
     }

     FormKeyBoard form = new FormKeyBoard();

     if (service.ShowDialog(form) == DialogResult.OK)
     {
       object strReturn = form.strReturnValue;
       return strReturn;
     }

     return value;
   }
}

此類的功能是彈出一個模式的計算機Form 表單,與4.5.2.2 節定義的編輯器功能幾乎一樣,這 裡就不作多講,如果還有不明白的地方請回顧一下前面章節的內容。

最後定義主控制項代碼類,如下所示:

/// <summary>
/// 獲得本書更多內容,請看:
/// http://blog.csdn.net/ChengKing/archive/2008/08/18/2792440.aspx
/// </summary>

[DefaultProperty("Money")]
[ToolboxData("<{0}:CalculatorSelectControl
   runat=server></{0}:CalculatorSelectControl>")]
public class CalculatorSelectControl : WebControl
{
   [Bindable(true)]
   [Category("自訂計算機屬性")]
   [DefaultValue("")]
   [Localizable(true)]
   [Editor(typeof(CalculatorSelectEditor),typeof(System.Drawing.Design.  UITypeEditor))]
   [Description("請輸入金額")]
   public string Money 
   {
     get
     {
       string s = (string)ViewState["Money"];
       return ((s == null) ? "" : s);
     }

     set
     {
       ViewState["Money"] = value;
     }
   }
   //… …
}

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