无效的回发或回调参数.使用'<pages enableEventValidation ="true"/>'启用事件验证

当我从客户端发回页面时,我收到以下错误.我有JavaScript代码修改客户端的asp:ListBox.

我们如何解决这个问题？

错误详情如下:

Server Error in '/XXX' Application.

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Invalid postback or callback argument.  Event validation is enabled using  in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using  in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: Invalid postback or callback argument.  Event validation is enabled using  in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.]
   System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2132728
   System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +108
   System.Web.UI.WebControls.ListBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +274
   System.Web.UI.WebControls.ListBox.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +11
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +353
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1194

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Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

小智.. 180

你的Page_Load活动中有代码吗？如果是,那么也许通过添加以下将有所帮助.

if (!Page.IsPostBack)
{ //do something }

当您单击命令并再次运行Page_load时会抛出此错误,在正常的生命周期中将是Page_Load - > Click on Command - > Page_Load(再次) - > Process ItemCommand Event

你的Page_Load活动中有代码吗？如果是,那么也许通过添加以下将有所帮助.

if (!Page.IsPostBack)
{ //do something }

当您单击命令并再次运行Page_load时会抛出此错误,在正常的生命周期中将是Page_Load - > Click on Command - > Page_Load(再次) - > Process ItemCommand Event

问题是ASP.NET无法了解这个额外的或删除的listitem.你有很多选择(如下所列):

禁用事件验证(糟糕的想法,因为你失去了一点安全性,成本很低).

使用ASP.NET Ajax UpdatePanel.(如果添加或删除列表框,请将列表框放在Updatepanel中并触发更新.这样,viewstate和相关字段将获得更新,并且事件验证将通过.)

忘记客户端并使用经典回发并添加或删除listitems服务器端.

我希望这有帮助.

我有过DataGrid的经验.其中一个栏目是"选择"按钮.当我点击任何行的"选择"按钮时,我收到此错误消息:

"无效的回发或回调参数.使用配置或页面中的<%@ Page EnableEventValidation ="true"%>启用事件验证.出于安全考虑,此功能验证回发或回调事件的参数是否来自服务器控件最初呈现它们.如果数据有效且预期,请使用ClientScriptManager.RegisterForEventValidation方法注册回发或回调数据以进行验证."

我改变了几个代码,最后我成功了.我的经历路线:

1)我将页面属性更改为EnableEventValidation="false".但它没有用. (出于安全原因,这不仅是危险的,我的事件处理程序没有被调用:void Grid_SelectedIndexChanged(object sender, EventArgs e)

2)我ClientScript.RegisterForEventValidation在Render方法中实现.但它没有用.

protected override void Render(HtmlTextWriter writer)
{
    foreach (DataGridItem item in this.Grid.Items)
    {
        Page.ClientScript.RegisterForEventValidation(item.UniqueID);
        foreach (TableCell cell in (item as TableRow).Cells)
        {
            Page.ClientScript.RegisterForEventValidation(cell.UniqueID);
            foreach (System.Web.UI.Control control in cell.Controls)
            {
                if (control is Button)
                    Page.ClientScript.RegisterForEventValidation(control.UniqueID);
            }
        }
    }
}

3)我将网格列中的按钮类型从PushButton更改为LinkButton.有效!("ButtonType ="LinkBut​​ton").我认为如果你可以在其他情况下将按钮更改为其他控件,如"LinkBut​​ton",它将正常工作.

你真的想做2或3,不要禁用事件验证.

向asp:listbox客户端添加项目有两个主要问题.

首先是它干扰了事件验证.返回服务器的不是它发送的内容.

第二个是即使您禁用事件验证,当您的页面被回发后,列表框中的项目将从视图状态重建,因此您在客户端上所做的任何更改都将丢失.这样做的原因是asp.net不希望在客户端上修改列表框的内容,它只需要进行选择,因此它会丢弃您可能做出的任何更改.

最好的选择是最有可能使用建议的更新面板.另一个选择,如果你真的需要做这个客户端,是使用普通的旧而不是,并将你的项目列表保存在隐藏的字段中.当页面在客户端上呈现时,您可以从文本字段内容的分割中填充它.

然后,当您准备发布它时,您将从修改后的字段中重新填充隐藏字段的内容

.然后,当然,你必须在服务器上再次拆分它并对你的项目做一些事情,因为你的选择是空的,因为它已经回到了服务器上.

        
        

        ...
        

protected override void Render(HtmlTextWriter writer)
{
    foreach (string val in allPossibleListBoxValues)
    {
        Page.ClientScript.RegisterForEventValidation(myListBox.UniqueID, val);
    }
    base.Render(writer);
}

protected override void Render(HtmlTextWriter writer)
{
    foreach (ListItem i in listBoxAll.Items)
    {
        Page.ClientScript.RegisterForEventValidation(listBoxSelected.UniqueID, i.Value);
    }
    base.Render(writer);
}

public class ListBoxNoEventValidation : ListBox 
{
}

protected override void OnInit(EventArgs e) {
  foreach (GridViewRow grdRw in gvEvent.Rows) {

  Button deleteButton = (Button)grdRw.Cells[2].Controls[1];

  deleteButton.ID = "btnDelete_" + grdRw.RowIndex.ToString();           
  }
}

DropDownList DD = (DropDownList)F.FindControl("DDlista");
HiddenField HF = (HiddenField)F.FindControl("HFlista");
string[] opcoes = HF.value.Split('\n');
foreach (string opcao in opcoes) DD.Items.Add(opcao);

HF.value = "option 1\n\roption 2\n\roption 3";

DropDownList DD = (DropDownList)F.FindControl("DDlista");
HiddenField HF = (HiddenField)F.FindControl("HFlista");
string dados = HF.Value.Replace("\r", "");
string[] opcoes = dados.Split('\n');
foreach (string opcao in opcoes) DD.Items.Add(opcao);