方式1:

foreach (Control c in this.Repeater1.Controls)
   {
    HtmlInputCheckBox check = (HtmlInputCheckBox)c.FindControl("cbDelete1");
    if( check != null )
    {
     check.Checked = true;
    }

   }

方式2:

for (int i=0;i   {
    HtmlInputCheckBox check = (HtmlInputCheckBox)this.Repeater1.Items[i].FindControl("cbDelete1");
    if( check != null )
    {
     check.Checked = true;
    }
   }

方式3:

foreach( RepeaterItem item in this.Repeater1.Items )
   {
    HtmlInputCheckBox check = (HtmlInputCheckBox)item.FindControl("cbDelete1");
    if( check != null )
    {
     check.Checked = true;
    }
   }