OnTextChanged事件不會在UpdatePanel內部觸發 - 都是動態創建的

Question

我想要做的是用文本框填充GridView的列並執行一些函數OnTextChanged。 這是我的代碼：

if (e.Row.RowType == DataControlRowType.DataRow) 
    { 

     UpdatePanel UP_AmountToBuy = new UpdatePanel(); 
     UP_AmountToBuy.ContentTemplateContainer.Controls.Clear(); 
     UP_AmountToBuy.Triggers.Clear(); 
     UP_AmountToBuy.UpdateMode = UpdatePanelUpdateMode.Conditional; 
     UP_AmountToBuy.ChildrenAsTriggers = false; 
     UP_AmountToBuy.Attributes["runat"] = "server"; 

     //Create and add TextBox 
     TextBox TB_AmountToBuy = new TextBox(); 
     TB_AmountToBuy.Text = "0"; 
     TB_AmountToBuy.TextChanged += new EventHandler(TB_AmountToBuy_TextChanged); 
     TB_AmountToBuy.Attributes["OnTextChanged"] = "TB_AmountToBuy_TextChanged"; 
     TB_AmountToBuy.Attributes["runat"] = "server"; 
     TB_AmountToBuy.AutoPostBack = true; 
     TB_AmountToBuy.ViewStateMode = System.Web.UI.ViewStateMode.Enabled; 
     TB_AmountToBuy.ID = "buyID" + count; 
     UP_AmountToBuy.ContentTemplateContainer.Controls.Add(TB_AmountToBuy); 

     //Create and add AsyncPostBackTrigger 
     AsyncPostBackTrigger APBT_trig = new AsyncPostBackTrigger(); 
     APBT_trig.EventName = "TextChanged"; 
     APBT_trig.ControlID = TB_AmountToBuy.ID; 
     UP_AmountToBuy.Triggers.Add(APBT_trig); 

     Label newLBL = new Label(); 
     newLBL.Text = "123"; 
     newLBL.Attributes["runat"] = "server"; 
     UP_AmountToBuy.ContentTemplateContainer.Controls.Add(newLBL); 

     e.Row.Cells[5].Controls.Add(UP_AmountToBuy); 
     count++; 
    } 
} 

public void TB_AmountToBuy_TextChanged(object sender, EventArgs e) 
{ 
    ((sender as TextBox).Parent.Controls[1] as Label).Text = (sender as TextBox).Text; 
} 

的問題是，該事件OnTextChanged從來沒有發射...

需要創建在頁面加載每次爲了恢復自己的視圖狀態

Answer 1

動態生成的控制，火災事件從them.Like獲得價值這個

public partial class _Default : Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 


     if (!IsPostBack) 
     { 
      var dt = new System.Data.DataTable(); 
      dt.Columns.Add("Col1"); 
      dt.Rows.Add("Hi"); 
      GridView1.DataSource = dt; 
      GridView1.DataBind(); 
     } 

     CreateDynamicControles(); 


    } 

    public void CreateDynamicControles() 
    { 
     var count = 0; 
     foreach (GridViewRow row in GridView1.Rows) 
     { 
      if (row.RowType == DataControlRowType.DataRow) 
      { 

       UpdatePanel UP_AmountToBuy = new UpdatePanel(); 
       UP_AmountToBuy.ContentTemplateContainer.Controls.Clear(); 
       UP_AmountToBuy.Triggers.Clear(); 
       UP_AmountToBuy.UpdateMode = UpdatePanelUpdateMode.Conditional; 
       UP_AmountToBuy.ChildrenAsTriggers = false; 
       UP_AmountToBuy.Attributes["runat"] = "server"; 

       //Create and add TextBox 
       TextBox TB_AmountToBuy = new TextBox(); 
       TB_AmountToBuy.Text = "0"; 
       TB_AmountToBuy.TextChanged += new EventHandler(TB_AmountToBuy_TextChanged); 
       TB_AmountToBuy.Attributes["OnTextChanged"] = "TB_AmountToBuy_TextChanged"; 
       TB_AmountToBuy.Attributes["runat"] = "server"; 
       TB_AmountToBuy.AutoPostBack = true; 
       TB_AmountToBuy.ViewStateMode = System.Web.UI.ViewStateMode.Enabled; 
       TB_AmountToBuy.ID = "buyID" + count; 
       UP_AmountToBuy.ContentTemplateContainer.Controls.Add(TB_AmountToBuy); 

       //Create and add AsyncPostBackTrigger 
       AsyncPostBackTrigger APBT_trig = new AsyncPostBackTrigger(); 
       APBT_trig.EventName = "TextChanged"; 
       APBT_trig.ControlID = TB_AmountToBuy.ID; 
       UP_AmountToBuy.Triggers.Add(APBT_trig); 

       Label newLBL = new Label(); 
       newLBL.Text = "123"; 
       newLBL.Attributes["runat"] = "server"; 
       UP_AmountToBuy.ContentTemplateContainer.Controls.Add(newLBL); 

       row.Cells[0].Controls.Add(UP_AmountToBuy); 
       count++; 
      } 
     } 
    } 



    public void TB_AmountToBuy_TextChanged(object sender, EventArgs e) 
    { 
     ((sender as TextBox).Parent.Controls[1] as Label).Text = (sender as TextBox).Text; 
    } 
} 

Answer 2

試試這個，因爲你正在使用的UpdatePanel。所以使用以下屬性。

套裝屬性：

EnableViewstate="True"