当我从客户端返回一个页面时,我得到以下错误。我有JavaScript代码,修改asp:ListBox在客户端。

我们如何解决这个问题?

错误详情如下:

Server Error in '/XXX' Application.

--------------------------------------------------------------------------------
Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> 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 <pages enableEventValidation="true"/> 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 <pages enableEventValidation="true"/> 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

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

当前回答

你需要做2或3个,不要禁用事件验证。

在asp:listbox客户端添加项目有两个主要问题。

The first is that it interferes with event validation. What came back to the server is not what it sent down. The second is that even if you disable event validation, when your page gets posted back the items in the listbox will be rebuilt from the viewstate, so any changes you made on the client are lost. The reason for this is that a asp.net does not expect the contents of a listbox to be modified on the client, it only expects a selection to be made, so it discards any changes you might have made.

最好的选择是像推荐的那样使用更新面板。另一个选择,如果你真的需要这样做的客户端,是使用普通的<select>而不是<asp:ListBox>,并保持你的项目列表在一个隐藏字段。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,您从修改后的<select>中重新填充隐藏字段的内容。然后,当然,您必须在服务器上再次分割它,并对您的项目做一些事情,因为您的选择现在是空的,因为它回到了服务器上。

总而言之,这是一个非常麻烦的解决方案,我并不推荐,但如果您确实需要对listBox进行客户端修改,它确实可以工作。但是,我真的建议您在走这条路之前查看一下updatePanel。

其他回答

如果您预先知道可以填充的数据,那么可以使用ClientScriptManager来解决这个问题。当我在以前的用户选择上使用javascript动态填充下拉框时,我遇到了这个问题。

下面是一些覆盖呈现方法(在VB和c#中)并为下拉列表ddCar声明潜在值的示例代码。

在VB:

Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)

    Dim ClientScript As ClientScriptManager = Page.ClientScript

    ClientScript.RegisterForEventValidation("ddCar", "Mercedes")

    MyBase.Render(writer)
End Sub

或者c#的轻微变化可以是:

protected override void Render(HtmlTextWriter writer)
{
    Page.ClientScript.RegisterForEventValidation("ddCar", "Mercedes");
    base.Render(writer);
}

对于新手:这应该在文件(.vb或.cs)后面的代码中,或者如果在aspx文件中使用,您可以在<script>标记中进行包装。

你需要做2或3个,不要禁用事件验证。

在asp:listbox客户端添加项目有两个主要问题。

The first is that it interferes with event validation. What came back to the server is not what it sent down. The second is that even if you disable event validation, when your page gets posted back the items in the listbox will be rebuilt from the viewstate, so any changes you made on the client are lost. The reason for this is that a asp.net does not expect the contents of a listbox to be modified on the client, it only expects a selection to be made, so it discards any changes you might have made.

最好的选择是像推荐的那样使用更新面板。另一个选择,如果你真的需要这样做的客户端,是使用普通的<select>而不是<asp:ListBox>,并保持你的项目列表在一个隐藏字段。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,您从修改后的<select>中重新填充隐藏字段的内容。然后,当然,您必须在服务器上再次分割它,并对您的项目做一些事情,因为您的选择现在是空的,因为它回到了服务器上。

总而言之,这是一个非常麻烦的解决方案,我并不推荐,但如果您确实需要对listBox进行客户端修改,它确实可以工作。但是,我真的建议您在走这条路之前查看一下updatePanel。

在Page_Load事件中有代码吗?如果是,那么添加以下内容可能会有所帮助。

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

在正常的生命周期中,当您单击命令并再次运行Page_load时,将抛出此错误 Page_Load ->单击“Command -> Page_Load(再次)-> Process ItemCommand Event”

如果您使用Ajax更新面板。添加<Triggers>标签,并在其中使用<asp:PostBackTrigger…/>触发按钮或控件导致回发

我通过没有将ListBox添加到父Page/Control控件集合来解决这个确切的错误。因为我真的不需要任何服务器端功能。我只是想用它来输出自定义服务器控件的HTML,这是我在OnRender事件处理程序中自己做的。我希望使用该控件可以使我不必编写自己的html响应。

这个解决方案可能不适合大多数人,但它使ASP。NET对控件执行ValidateEvent,因为控件在回发之间不会保留在内存中。

此外,我的错误是由选定的列表项是一个项目,不是在前回发的列表框。希望能帮到谁。