[ASP.NET][Control] Page.FindControl

2008-08-07

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ASP.NET
2009-09-02

撰寫網頁程式時,有時會需要抓取控制項填入值或更改設定,可以用Page.FindControl()來抓取控制項....

基本語法範例:

//宣告控制項型別及名稱 = ( 強制轉換型別) FindControl(尋找的控制項名稱)

Label lblin = (Label)FindControl(lblSPEC);

但是有時候需要使用多個控制項,這時候在設計介面時就很重要了,最好在設計時命名控制項的ID時加入有規則的數字,再以邏輯方法來找出控制項;這樣子一方面不用一個一個找,造成程式碼冗長,修改時費時不便;另一方面也讓程式較有效率.

範例:

/// <summary>

/// 清空Panel

/// </summary>

void ClearPanel()

{

//以For迴圈在控制項名稱帶入變數逐個尋找符合名稱的控制項

for (int i = 0; i <= 7; i++)

{

Panel pnl = (Panel)FindControl("Panel" + i.ToString());

if (pnl.Visible == true)

{

//找到控制項後判斷名稱若符合條件執行.....

switch (pnl.ID)

{

case "Panel0":

tbAM.Text = "";

lblAV.Text = "";

lblAR.Text = "";

ddlATF.SelectedIndex = 0;

lblAS.Text = "";

break;

case "Panel1":

tbBM.Text = "";

lblBV.Text = "";

lblBR.Text = "";

ddlBTF.SelectedIndex = 0;

lblBS.Text = "";

break;

case "Panel2":

tbCM.Text = "";

lblCV.Text = "";

lblCR.Text = "";

ddlCTF.SelectedIndex = 0;

lblCS.Text = "";

break;

case "Panel3":

tbDM.Text = "";

lblDV.Text = "";

lblDR.Text = "";

ddlDTF.SelectedIndex = 0;

lblDS.Text = "";

break;

case "Panel4":

tbEM.Text = "";

lblEV.Text = "";

lblER.Text = "";

ddlETF.SelectedIndex = 0;

lblES.Text = "";

break;

case "Panel5":

tbFM.Text = "";

lblFV.Text = "";

lblFR.Text = "";

ddlFTF.SelectedIndex = 0;

lblFS.Text = "";

break;

case "Panel6":

tbGM.Text = "";

lblGV.Text = "";

lblGR.Text = "";

ddlGTF.SelectedIndex = 0;

lblGS.Text = "";

break;

case "Panel7":

tbHM.Text = "";

lblHV.Text = "";

lblHR.Text = "";

ddlHTF.SelectedIndex = 0;

lblHS.Text = "";

break;

}

pnl.Visible = false;

}

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