.NET中利用js让子窗体向父页面传值的实现方法

子页面c#后台代码：

/// <summary>  
     /// 将设置好的值赋给父页面  
     /// </summary>  
     /// <param name="count">需要传递的值</param>  
     void setvaluetoparentpage(int count, string strpersons) 
     { 
         stringbuilder jsstr = new stringbuilder(); 
         jsstr.append(" var retvalue = new object();"); 
         if (count == 0) 
         { 
             jsstr.appendformat("retvalue = null;"); 
         } 
         else 
         { 
             jsstr.appendformat("retvalue.nums='{0}';", count); 
             jsstr.appendformat("retvalue.names='{0}';", strpersons); 
         } 
         jsstr.append("window.returnvalue = retvalue;window.close();"); 

         clientscript.registerstartupscript(gettype(), "close", jsstr.tostring(), true); 
     } 

父页面前台js：

function openperchoose(url) { 
          var openobj = window; 
          if (typeof (window.dialogarguments) == "object") { 
              openobj = window.dialogarguments; 
          } 
          var returnvalue = showpopwin(url, 800, 600, openobj); 
          if (returnvalue != null) { 
              document.getelementbyid("<%=txtqualifiednums.clientid %>").value = returnvalue.nums; 
          } 
      } 

//弹出窗口  
function showpopwin(url, width, height, returnfunc) { 
    width = parseint(width) + 30; 
    height = parseint(height) + 30; 
    return window.showmodaldialog(url + "&datetime=" + gettime(), document, "dialogwidth:" + width + "px;dialogheight:" + height + "px;help:0;status:0;scroll:auto;center:1;resizable:1;"); 
} 

  <th style="width: 100px;">
                培训合格人数：
            </th>
            <td style="width: 50px;">
                <asp:textbox id="txtqualifiednums" runat="server" width="50px" readonly="true"></asp:textbox>
            </td>