Get GridView in Multiple UserControl from codebehind

Question

IpInterfaceUC UserControl:

<div id="dvChannel" runat="server" style="height: 205px; width: 550px; overflow: auto;
        margin-left: 5px;">
        <asp:GridView ID="gvChannelUC">
</div>

CodeBehind for Init

int indexInterface=0;
foreach (DataRow row in dtDevicesListByRole.Rows)
{
                    ctrIpInterfaceUC = (Test2.SetupGroup.Ipservice.IpInterfaceUC)LoadControl("IpInterfaceUC.ascx");
                    Control ctr = (Control)ctrIpInterfaceUC;
                    ctr.ID = "device_"+ip+"_"+port+"$"+indexInterface;
                    phDevices.Controls.Add(ctr);//PlaceHolder for add many UserControl
}

Html Show

<div id="dvChannel">
<div id="device_192.168.2.19_3331_0_pnlChannelUC">
  <div id="device_192.168.2.19_3331_0_dvChannel">
    <table id="device_192.168.2.19_3331_0_gvChannelUC">
    </table>
  </div>
</div>
<div id="dvChannel">
<div id="device_192.168.2.19_3331_1_pnlChannelUC">
  <div id="device_192.168.2.19_3331_1_dvChannel">
    <table id="device_192.168.2.19_3331_1_gvChannelUC">
    </table>
  </div>
</div>

Question How do I get gridview from multiple UserControl?

Answer 1

Expose the gridview through a public property on your UserControl:

public GridView Grid
{
  get { return gvChannelUC; }
}

Then

List<string, string> Grids = new List<string, string>(); // <UCId, GridId>
...
ctrIpInterfaceUC = (Test2.SetupGroup.Ipservice.IpInterfaceUC)LoadControl("IpInterfaceUC.ascx");
string Id = "device_"+ip+"_"+port+"$"+indexInterface;

GridView ctrGridView = ctrIpInterfaceUC.Grid;
Grids.Add(Id, ctrGridView.ClientID);

Control ctr = (Control)ctrIpInterfaceUC;
ctr.ID = Id
phDevices.Controls.Add(ctr);//PlaceHolder for add many UserControl
...

Answer 2

While you can recursively use FindControl to find it, a much better approach is to let the UserControl IpInterfaceUC decide how to bind data to the controls within it.

You could add a public method ShowData to you UserControl and pass the data to be displayed to it. It can then assign it to gvChannelUC.

int indexInterface=0;
foreach (DataRow row in dtDevicesListByRole.Rows)
{
    var ctrIpInterfaceUC = (Test2.SetupGroup.Ipservice.IpInterfaceUC)LoadControl("IpInterfaceUC.ascx");
    ctrIpInterfaceUC.ShowData(myRows);
    ctrIpInterfaceUC.ID = "device_"+ip+"_"+port+"$"+indexInterface;
    phDevices.Controls.Add(ctrIpInterfaceUC);//PlaceHolder for add many UserControl
}