如何在动态创建的ASP.net控件中动态创建ASP.net控件

这是向页面连续添加按钮的示例。每个新创建的按钮也可以向页面添加另一个按钮。可以与所有类型的控件一起使用。另外，您还必须在每个PostBack上重新创建动态控件，否则它们及其内容将丢失。

protected void Page_Load(object sender, EventArgs e){    //set the initial number of buttons    int buttonCount = 1;    //check if the viewstate with the buttoncount already exists (= postback)    if (ViewState["buttonCount"] != null)    {        //convert the viewstate back to an integer        buttonCount = Convert.ToInt32(ViewState["buttonCount"]);    }    else    {        ViewState["buttonCount"] = buttonCount;    }    //create the required number of buttons    for (int i = 1; i <= buttonCount; i++)    {        createButton(i);    }}private void createButton(int cnt){    //create a new button control    Button button = new Button();    button.Text = "Add another Button (" + cnt + ")";    //add the correct method to the button    button.Click += DynamicButton_Click;    //another control, in this case a literal    Literal literal = new Literal();    literal.Text = "<br>";    //add the button and literal to the placeholder    PlaceHolder1.Controls.Add(button);    PlaceHolder1.Controls.Add(literal);}protected void DynamicButton_Click(object sender, EventArgs e){    //get the current number of buttons    int buttonCount = Convert.ToInt32(ViewState["buttonCount"]) + 1;    //create another button    createButton(buttonCount);    //set the new button count into the viewstate    ViewState["buttonCount"] = buttonCount;}

更新

您还可以将a委托

Command

Click

CommandArgument

//add the correct method to the buttonbutton.Command += DynamicButton_Command;//now you can also add an argument to the buttonbutton.CommandArgument = "Create Hazard";

您还需要其他方法来处理按钮单击。

protected void DynamicButton_Command(object sender, CommandEventArgs e){    //get the current number of buttons    int buttonCount = Convert.ToInt32(ViewState["buttonCount"]) + 1;    //create another button    createButton(buttonCount);    //set the new button count into the viewstate    ViewState["buttonCount"] = buttonCount;    //get the commandargument from the button    string buttonArgument = e.CommandArgument.ToString();}