无法修改Controls集合，因为控件包含代码块（即） [英] The Controls collection cannot be modified because the control contains code blocks (i.e. )

问题描述

我在我的appcode中使用printclass



来自printimgbtn点击事件后面的代码我正在调用静态类方法，其参数为contorl和string





这是类代码：

  public   static   void  PrintWebControl（Control ctrl， string 脚本）
 {
  //   if（System.Web.HttpContext。当前。（字符串）会话[isgrid] ==网格） 
  //   { 
  //   GridView grid =（GridView）ctrl;  
  //   grid.AllowPaging = false;  
  //   grid.DataBind（）;  
  //  }  
 
 
 StringWriter stringWrite =  new  StringWriter（）; 
 System.Web.UI.HtmlTextWriter htmlWrite =  new  System.Web.UI.HtmlTextWriter（stringWrite）; 
  if （ctrl   WebControl）
 {
单位w =  new 单位（ 100 ，UnitType.Percentage）; （（WebControl）ctrl）.Width = w; 
} 
 Page pg =  new  Page（）; 
 pg.EnableEventValidation =  false ; 
  if （Script！=  string  .Empty）
 {
 pg.ClientScript.RegisterStartupScript（pg.GetType（），  PrintJavaScript，Script）; 
} 
 HtmlForm frm =  new  HtmlForm（）; 
 pg.Controls.Add（frm）; 
 frm.Attributes.Add（  runat，  server）; 
 frm.Controls.Add（ctrl）; 
 pg.DesignerInitialize（）; 
 pg.RenderControl（htmlWrite）; 
  string  strHTML = stringWrite.ToString（）; 
 HttpContext.Current.Response.Clear（）; 
 HttpContext.Current.Response.Write（strHTML）; 
 HttpContext.Current.Response.Write（ < script> window.print（）;< /脚本>中）; 
 HttpContext.Current.Response.End（）; 
} 
 
代码背后代码：
 
 受保护  void  btnPrint_Click（ object  sender，ImageClickEventArgs e）
 {
 
 PrintHelper.PrintWebControl（PnlExportButtons0，串 .Empty）; 
} 
 
但 显示错误：
 
无法修改Controls集合，因为控件包含代码块（即<％... ％> ）

解决方案

查看您的HTML设计



将代码块替换为<％＃而不是<％=



首选

aspnet-controls-collection-can-be.html [ ^ ]

-controls-collection-can-be-modified-because-the-control-contains-code-bl [ ^ ]

你解决了我更换

< pre lang =   cs> document.getElementById（ContentPlaceHolder1_txtFromDate）。 value  =（ new  Date（））。format（'  dd / MMM / yyyy'）; 
 document.getElementById（ContentPlaceHolder1_txtToDate）。 value  =（ new  Date（））。format（ '  dd / MMM / yyyy'）; 
 
 
 document.getElementById（<  =％txtfromdate = ％> ）。 value  =（ new  Date（））。format（'  dd / MMM / yyyy）; 
 document.getElementById（< =％txtTodate =％>）。value =（new Date（））。format（' dd / MMM / yyyy）; 

i am using printclass in my appcode

from code behind printimgbtn click event i am calling static class method which had arguments as contorl and string


this is class code :

public static void PrintWebControl(Control ctrl, string Script)
    {
        //if (System.Web.HttpContext.Current.(string)Session["isgrid"] == "grid")
        //{
        //    GridView grid = (GridView)ctrl;
        //    grid.AllowPaging = false;
        //    grid.DataBind();
        //}


        StringWriter stringWrite = new StringWriter();
        System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
        if (ctrl is WebControl)
        {
            Unit w = new Unit(100, UnitType.Percentage); ((WebControl)ctrl).Width = w;
        }
        Page pg = new Page();
        pg.EnableEventValidation = false;
        if (Script != string.Empty)
        {
            pg.ClientScript.RegisterStartupScript(pg.GetType(), "PrintJavaScript", Script);
        }
        HtmlForm frm = new HtmlForm();
        pg.Controls.Add(frm);
        frm.Attributes.Add("runat", "server");
        frm.Controls.Add(ctrl);
        pg.DesignerInitialize();
        pg.RenderControl(htmlWrite);
        string strHTML = stringWrite.ToString();
        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.Write(strHTML);
        HttpContext.Current.Response.Write("<script>window.print();</script>");
        HttpContext.Current.Response.End();
    }

code behind code : 

protected void btnPrint_Click(object sender, ImageClickEventArgs e)
{
    
    PrintHelper.PrintWebControl(PnlExportButtons0,string.Empty);
}

but it is showing the error  :

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

解决方案

See Your HTML design

Replace the code block with <%# instead of <%=

Prefer
aspnet-controls-collection-cannot-be.html[^]
the-controls-collection-cannot-be-modified-because-the-control-contains-code-bl[^]

ya it solved i replace

<pre lang="cs">document.getElementById(ContentPlaceHolder1_txtFromDate).value = (new Date()).format('dd/MMM/yyyy');
        document.getElementById(ContentPlaceHolder1_txtToDate).value = (new Date()).format('dd/MMM/yyyy');

by
document.getElementById(<=%txtfromdate=%>).value = (new Date()).format('dd/MMM/yyyy);
        document.getElementById(<=%txtTodate=%>).value = (new Date()).format('dd/MMM/yyyy);

这篇关于无法修改Controls集合，因为控件包含代码块（即）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！