Question

如果我进行PostBack检查，整个RadioButtonList会在索引更改时消失。

<asp:RadioButtonList ID="PollOptionsRadioButtonList" runat="server" AutoPostBack="True"

EnableViewState =“true”/＆gt;

    protected void Page_Load(object sender, EventArgs e)
    {
            PollOptionsRadioButtonList.SelectedIndexChanged += PollOptionsRadioButtonList_SelectedIndexChanged; 

            if (!Page.IsPostBack)
            {                   
            RenderPollOptions(poll);
            }

    }
    private void RenderPollOptions(Poll poll)
    {
        foreach (string option in poll.Options)
        {
            var optionItem = new ListItem();
            optionItem.Text = option;
            optionItem.Value = poll.Options.IndexOf(option).ToString();             
            PollOptionsRadioButtonList.Items.Add(optionItem);
        }
    }
    protected void PollOptionsRadioButtonList_SelectedIndexChanged(object sender, EventArgs e)
    {
        var x = 2;

    }

POLL CLASS

        [EPiServerDataStore(AutomaticallyCreateStore = true, AutomaticallyRemapStore = true)]
public class Poll: IDynamicData
{
        public Identity Id { get; set; }

        public string Question { get; set; }

    /// <summary>
    /// Stores all answes to this poll
    /// </summary>
        public List<PollAnswer> Answers { get; set; }

        public DateTime Created { get; set; }

        public List<string> Options { get; set; }

        public Poll()
        {
            Answers = new List<PollAnswer>();
            Options = new List<string>();
        }


}

Answer 1

由于某种原因，EnableViewState默认为false！

<%@ Page EnableViewState="true" >

解决了这个问题。

Answer 2

您可能还需要添加AutoPostback属性：

 PollOptionsRadioButtonList.AutoPostback = True;

Answer 3

您在每个回发中添加项目，将其包装在PostBack - 检查：

protected void Page_Load(object sender, EventArgs e)
{
    PollOptionsRadioButtonList.SelectedIndexChanged += PollOptionsRadioButtonList_SelectedIndexChanged; 
    if(!IsPostBack)
        RenderPollOptions(poll);
}

Answer 4

我已经处理过您的代码，错误仅在添加项目时。所以我有 IsPostBack 方法（）

尝试这样

<asp:RadioButtonList ID="PollOptionsRadioButtonList" runat="server" AutoPostBack="True"

EnableViewState="true" />

protected void Page_Load(object sender, EventArgs e)
{
        PollOptionsRadioButtonList.SelectedIndexChanged += PollOptionsRadioButtonList_SelectedIndexChanged; 
  if (!IsPostBack)
        {
            RenderPollOptions(poll);
        }
}
private void RenderPollOptions(Poll poll)
{
    foreach (string option in poll.Options)
    {
        var optionItem = new ListItem();
        optionItem.Text = option;
        optionItem.Value = poll.Options.IndexOf(option).ToString();             
        PollOptionsRadioButtonList.Items.Add(optionItem);
    }
}
protected void PollOptionsRadioButtonList_SelectedIndexChanged(object sender, EventArgs e)
{
    var x = 2;

}

RadioButtonList SelectedIndexChanged未触发

4 个答案: