String.Format with 2 parameters and ClientID

Question

String.Format with 2 parameters (ID Database and ClientID)

I would like that result, was

<a id="ctl00" onclick="OpenModal(704520,'asdf')">
    <img id="crico" src="../online/img_admin/icon_hist.gif" />
</a>

How to do?

---

I'm trying so:

     <asp:HyperLink ID="HyperLink4" runat="server" 
onclick='<%# String.Format("OpenModal({0},{1})", DataBinder.Eval(Container.DataItem, "intid"), (Image)GridView1.FindControl("img_Historico").ClientID) ) %>' >
      <asp:Image ID="img_Historico" runat="server" />
    </asp:HyperLink>

so basically is:

OpenModal(Id_do_DataBase, 'ClientID of image')

---

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0030: Cannot convert type 'string' to 'System.Web.UI.WebControls.Image'

---

Not working my code, so I asked here.

I also tried: onclick='<%# String.Format("AbreModal({0},{1})", DataBinder.Eval(Container.DataItem, "intid"), img_Historico.ClientID )

nothing works! :(

Answer 1

You want

((Image)GridView1.FindControl("img_Historico")).ClientID

Also, if your data binding expression is so complex, then you should refactor it into a property or method:

protected string ImgHistoricoClientID
{
    get {return ((Image)GridView1.FindControl("img_Historico")).ClientID;}
}

Databinding expression:

onclick='<%# String.Format("OpenModal({0},{1})", DataBinder.Eval(Container.DataItem, "intid"), ImgHistoricoClientID) ) %>' >

In fact, I would use the ItemDataBound event of the GridView to set the whole thing.

Answer 2

The problem lies in this line:

(Image)GridView1.FindControl("img_Historico").ClientID

ClientID is a string and you are casting it to an image. It should be:

GridView1.FindControl("img_Historico").ClientID

To make it clearer this would also work (with an unnessisary cast)

((Image)GridView1.FindControl("img_Historico")).ClientID