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How to access a HyperlinkField from Code behind?

Posted on 2009-04-23
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Last Modified: 2013-11-08
Here is some code snippets that show how I am trying to access a HyperLinkField in a GridView from the code page. I seem to be doing this wrong because the line in code behind where I try to get a handle on the control fails because the Controls collection is empty.


How should I be doing this?  My goal is to DataBind a DataSet to the HyperLinkFields I have built (works) and then slip in some URLs into the HyperLinkFields to go with them (no work).

Thank you for your time,
Dave


<asp:GridView ID="GridView1" runat="server" CellPadding="4" AutoGenerateColumns=false
                       OnDataBound=GridView1_OnDataBound
                       OnRowDataBound=GridView1_OnRowDataBound/>
            <Columns>
                <asp:HyperLinkField DataTextField="Column1" />                
            </Columns>
 </asp:GridView>
 
protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
    {     
        HyperLink link = (HyperLink)e.Row.Cells[0].Controls[0];  //this is where I get an index out of bounds because teh collection is empty
        link.Text = "test";
    }

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Question by:davecove
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Accepted Solution

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oobayly earned 1000 total points
ID: 24219619
How about using a TemplateField instead, inside of it place a hyperlink tag which uses DataBindings to set it's href & text values.

I've bounds to the "ID" field, but you'd use whatever's in your dataset
<asp:TemplateField HeaderText="Link">
  <ItemTemplate>
    <asp:HyperLink runat="server" NavigateUrl='<%# "/foo.aspx?" + Eval("ID") %>' Text='<%#Eval("ID") %>' ></asp:HyperLink>
  </ItemTemplate>
</asp:TemplateField>

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Author Comment

by:davecove
ID: 24225854
That seems reasonable... but with the code below I still get an Index out of range error when I try to pick the control out of the cell in the RowDataBound handler.

What am I missing?

Dave
//moving to something slightly simpler
<asp:TemplateField>
    <ItemTemplate>
        <asp:Label runat=server ID="Label1" Text='<%#Eval("Column1")%>'></asp:Label>
    </ItemTemplate>
</asp:TemplateField>
 
code behind:
 
Label link = (Label)e.Row.Cells[0].Controls[0]; //index error here, the Controls collection is empty
link.Text = "test";

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Expert Comment

by:oobayly
ID: 24226090
If the e.Row.Cells[0] is a Header cell, it may very well not contain any child controls. Also what's the point of manually setting the link's Text property? All you're doing is overwriting the bound value?
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