Question

我已经将linkbutton和label的enableviewstate属性设置为true.also在pageload事件处理程序中重新生成postback上的相同按钮。但是我无法调用linkbutton的onclick事件处理程序。请告诉我代码有什么问题？< / p>

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

        List<LinkButton> listOfLinkButton = Session["ListOfLinkButton"] as List<LinkButton>;
        List<Label> listOfLabel = Session["ListOfLabel"] as List<Label>;
        if(listOfLabel!=null && listOfLinkButton!=null)
        {
            for (int i = 0; i < listOfLinkButton.Count; i++)
            {
                PlaceHolder1.Controls.Add(listOfLinkButton[i]);
                PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
                PlaceHolder1.Controls.Add(listOfLabel[i]);
                PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
            }
        }



}



protected void LinkButton_Click(object sender, EventArgs e)
{
    LinkButton linkButton = sender as LinkButton;

    Response.Redirect(linkButton.Attributes["LinkUrl"]);        
}
protected void Button1_Click1(object sender, EventArgs e)
{

    List<LinkButton> listOfLinkButton = new List<LinkButton>();
    List<Label> listOfLabel = new List<Label>();
    Rss rssDocumentObj = RssFileReader.GetRssDocumentData(TextBox1.Text);
    for (int j = 0; j < rssDocumentObj.ListOfChannel.Count; j++)
    {
        LinkButton linkButton = new LinkButton();
        linkButton.ID = "LinkButtonForChannelDynamicInPlaceHolder1Id" + j;
        linkButton.EnableViewState = true;
        linkButton.ForeColor = Color.Blue;
        linkButton.Font.Bold = true;
        linkButton.Font.Size = 18;
        linkButton.Font.Underline = true;
        linkButton.Text = rssDocumentObj.ListOfChannel[j].ChannelTitle.InnerText;
        linkButton.Click += new EventHandler(LinkButton_Click);
        linkButton.Attributes.Add("LinkUrl", rssDocumentObj.ListOfChannel[j].ChannelLink.InnerText);
        linkButton.Attributes.Add("onmouseover", "this.style.color = '#006699'");
        linkButton.Attributes.Add("onmouseout", "this.style.color = '#0000ff'");
        PlaceHolder1.Controls.Add(linkButton);
        listOfLinkButton.Add(linkButton);
        PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
        Label label = new Label();
        label.ID = "LabelForChannelDynamicInPlaceHolder1Id" + j;
        label.EnableViewState = true;
        label.ForeColor = Color.DarkSlateGray;
        label.Text = rssDocumentObj.ListOfChannel[j].ChannelDescription.InnerText;
        PlaceHolder1.Controls.Add(label);
        listOfLabel.Add(label);
        PlaceHolder1.Controls.Add(new LiteralControl("<br />"));

        for (int i = 0; i < rssDocumentObj.ListOfChannel[j].ListOfItem.Count; i++)
        {
            LinkButton linkButtonForItem = new LinkButton();
            linkButtonForItem.ID = "LinkButtonDynamicInPlaceHolder1Id" + j + " " + i;
            linkButtonForItem.EnableViewState = true;
            linkButtonForItem.ForeColor = Color.Blue;
            linkButtonForItem.Font.Bold = true;
            linkButtonForItem.Font.Size = 14;
            linkButtonForItem.Font.Underline = false;
            linkButtonForItem.Text = rssDocumentObj.ListOfChannel[j].ListOfItem[i].ItemTitle.InnerText;
            linkButtonForItem.Click += new EventHandler(LinkButton_Click);
            linkButtonForItem.Attributes.Add("LinkUrl", rssDocumentObj.ListOfChannel[j].ListOfItem[i].ItemLink.InnerText);
            linkButtonForItem.Attributes.Add("onmouseover", "this.style.color = '#006699'");
            linkButtonForItem.Attributes.Add("onmouseout", "this.style.color = '#0000ff'");
            PlaceHolder1.Controls.Add(linkButtonForItem);
            listOfLinkButton.Add(linkButtonForItem);
            PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
            Label labelForItem = new Label();
            labelForItem.ID = "LabelDynamicInPlaceHolder1Id" + i;
            labelForItem.EnableViewState = true;
            labelForItem.ForeColor = Color.DarkGray;
            labelForItem.Text = rssDocumentObj.ListOfChannel[j].ListOfItem[i].ItemDescription.InnerText;
            PlaceHolder1.Controls.Add(labelForItem);
            listOfLabel.Add(labelForItem);
            PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
            Session["ListOfLinkButton"] = listOfLinkButton;
            Session["ListOfLabel"] = listOfLabel;
        }
    }  
}

}

Answer 1

您正在假设会话中保存该按钮的哪些方面。在页面加载期间从会话状态恢复时，请尝试再次将该事件添加到该按钮。

Answer 2

我通过从会话中检索事件处理程序后再次将事件处理程序分配给按钮来获得我的解决方案，但我无法理解为什么我需要再次分配它，当它已经在存储的会话变量中分配时。

Asp.net:调用动态生成按钮的事件处理程序？

2 个答案: