javascript - IE10 发送带小数(浮点值)的图像按钮单击坐标导致 ParseInt32 FormatException

Question

似乎 ASP.NET 4.0 不准备处理由 Internet Explorer 10 触发的 ImageButton 事件。问题是 IE10 将图像点击坐标作为 double 值(带小数)发送，而 ASP.NET 尝试将它们解析为整数，呈现以下类型的错误:

System.Web.HttpUnhandledException (0x80004005): 
   Exception of type 'System.Web.HttpUnhandledException' was thrown. 
   ---> System.FormatException: Input string was not in a correct format.

   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.Web.UI.WebControls.ImageButton.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.members_addtocartlogin_twostep_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\932deaba\63ff7eeb\App_Web_MyPage.aspx.28424a96.oraym_un.0.cs:line 0
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

谷歌搜索，有人建议强制 IE10 在兼容性 View 中运行。但是，添加元标记 <meta http-equiv="X-UA-Compatible" content="IE=10" />解决不了任何问题；并添加 <?xml version="1.0" encoding="UTF-8">之前 <!DOCTYPE>也不行。

有什么解决办法吗？我可以使用 Javascript 捕获点击事件并以某种方式删除小数吗？

注:升级到 Framework 4.5 并重新编译修复了该错误。无需更改运行时版本，因为它仍然是 4.0。

Answer 1

.NET CLR 2.0 和 4.0 有修补程序，如 this blog entry by Scott Hanselmann 中所述:

What the fixes do is update the ie.browser and firefox.browser files in \Windows\Microsoft.NET\Framework\<version>\Config\Browsers with new and future-proofed versions of these browser definitions. Nothing else is affected.

.NET 4

http://support.microsoft.com/kb/2600088

.NET 2.0

http://support.microsoft.com/kb/2600100适用于 Win7 SP1/Windows
服务器 2008 R2 SP1、Windows Vista/Server 2008、Windows XP/Server 2003

http://support.microsoft.com/kb/2608565适用于 Win7/Windows 服务器
2008 R2 RTM

或者，有一个基于客户端的 javascript 补丁(最初作为解决方法发布在 Connect item with bug ID:755419 上):

$(function () {
    // Patch fractional .x, .y form parameters for IE10.
    if (typeof (Sys) !== 'undefined' && Sys.Browser.agent === Sys.Browser.InternetExplorer && Sys.Browser.version === 10) {
        Sys.WebForms.PageRequestManager.getInstance()._onFormElementActive = function Sys$WebForms$PageRequestManager$_onFormElementActive(element, offsetX, offsetY) {
            if (element.disabled) {
                return;
            }
            this._activeElement = element;
            this._postBackSettings = this._getPostBackSettings(element, element.name);
            if (element.name) {
                var tagName = element.tagName.toUpperCase();
                if (tagName === 'INPUT') {
                    var type = element.type;
                    if (type === 'submit') {
                        this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                    }
                    else if (type === 'image') {
                        this._additionalInput = encodeURIComponent(element.name) + '.x=' + Math.floor(offsetX) + '&' + encodeURIComponent(element.name) + '.y=' + Math.floor(offsetY);
                    }
                }
                else if ((tagName === 'BUTTON') && (element.name.length !== 0) && (element.type === 'submit')) {
                    this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                }
            }
        };
    }
});