RadioButtons CheckedChanged事件

Question

我在頁面上有20個單選按鈕，我想知道他們中的哪一個被點擊。

protected void Page_Load(object sender, EventArgs e) 
{ 
    Button newBTN = new Button(); 

    newBTN.Text = "Button 1"; 
    PlaceHolder1.Controls.Add(newBTN); 
    for (int i = 0; i < 20; i++) 
    { 
     RadioButton r = new RadioButton(); 
     r.ID = i.ToString(); 
     r.CheckedChanged += RadioButton1_CheckedChanged; 
     PlaceHolder1.Controls.Add(r); 
    } 
} 

新更新的代碼..注意：該代碼與上述代碼相關。

 public List<int> ThreadID2Treat { get { return ViewState["Checked"] == null ? null : (List<int>)ViewState["Checked"]; } set { ViewState["Checked"] = value; } } 
protected void CheckBox1_CheckedChanged(object sender, EventArgs e) 

{

var rad = (CheckBox)sender; 
int threadID = int.Parse(rad.ID.ToString()); 
ThreadID2Treat.Add(threadID); 

}

public void DeleteButton_Clicked(object sender, EventArgs e) 
{ 
    foreach (var item in ThreadID2Treat) 
    { 
     UsefulStaticMethods.DeleteThreads(item); 
    } 
} 

我怎麼發現的？

Answer 1

var rad = (RadioButton)sendder; 
Response.Write("RadioButton Id :" + rad.Id.ToString()); 

你可以試試以上。

更新：
要獲取PlaceHolder中的所有選擇單選按鈕，請確保單選按鈕上未設置AutoPostBack。你不需要添加CheckChanged事件。 「r.CheckedChanged + = RadioButton1_CheckedChanged;」 < =刪除。

StringBuilder stringBuilder = new StringBuilder(); 
    foreach (var control in placeHolder1.Controls) 
    { 
     var rad = control as RadioButton; 
     if (rad != null) 
     { 
      if (rad.Checked) 
       stringBuilder.AppendLine(String.Format("Radion Button Checked : {0}", rad.ID)); 
     } 
    } 

    Response.Write(stringBuilder.ToString()); 

Answer 2

使用參數sender您可以直接引用事件源控件。

var rb = (RadioButton)sender; 

如果您想直接觸發該事件，並回傳，你必須設置單選按鈕的AutoPostBack，物業給true。

Answer 3

你可以試試這個。

RadioButton r = sender as RadioButton; 
Response.Write(r.Id); 

Answer 4

演員發件人爲單選按鈕：

RadioButton r = sender as RadioButton; 
if(r != null) 
{ 
    //Do stuff 
} 

Answer 5

protected void RadioButton1_CheckedChanged(object sender, EventArgs e) 
    { 
     if (sender is RadioButton) 
     { 

      RadioButton radioButton = (RadioButton)sender; 
      //Code to use radioButton's properties to do something useful. 
      // get the radio button by its ID 
      string id = radioButton.ID; 



     } 
    }