Dynamically set a hyperlink control's Navigate

问题:

How can I dynamically set a stand alone(not in gridview) hyperlink control's NavigateUrl property inline in the aspx page?

I have tried to do the following, but it did not work.

<asp:HyperLink id="MyLink"
  NavigateUrl="../mypage.aspx?id=<%= pageid %>"
  runat="server">My Page</asp:HyperLink>

回答1:

You could do this in the codebehind:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string pageid = "123";
        MyLink.NavigateUrl = string.Format("../mypage.aspx?id={0}", pageid);
    }
}

---

UPDATE:

Now that @Marko Ivanovski pointed me in the comments that this hyperlink is inside a GridView which I didn't notice in the beginning the easiest would be to use databinding (<%# syntax):

<asp:TemplateColumn>
    <ItemTemplate>
        <asp:HyperLink 
            id="MyLink" 
            NavigateUrl='<%# Eval("pageid", "~/mypage.aspx?id={0}")  %>'
            runat="server">
        My Page
        </asp:HyperLink>
    </ItemTemplate>
</asp:TemplateColumn>

In this case pageid is a property of the data source.

---

UPDATE 2:

Do you really need a server side control? How about:

<a href="<%= this.ResolveUrl("~/mypage.aspx?id=" + pageid) %>">
    My Page
</a>

回答2:

You can actually write a simple string method in your codebehind file.

Example

public string formatUrl(string pageId) {
    return "../mypage.aspx?id=" + pageId;
}

And then use it like..

<asp:HyperLink id="MyLink" NavigateUrl="<%= formatUrl(pageid) %>" runat="server">My Page</asp:HyperLink>

provided pageid exists

回答3:

<asp:TemplateField HeaderText="Name" HeaderStyle-Width="100">
    <ItemTemplate>
        <a href="f.aspx?id=<%# DataBinder.Eval(Container, "DataItem.i")%>">
            <asp:Label ID="lblN" Font-Underline="true" runat="server" Width="80px" Text='<%#DataBinder.Eval(Container.DataItem,"n")%>' />
        </a>
    </ItemTemplate>
</asp:TemplateField>