Question

希望您一切都好，谢谢您的帮助。

我有4个单选按钮和一个按钮，如果未选中任何一个单选按钮，标签将显示一条消息，以便最终用户邀请选择一个单选按钮。

Default.aspx：

<%@ Page Language="C#" Inherits="Challenge12Proj.Default" %>
<!DOCTYPE html>
<html>
<head runat="server">
	<title>Default</title>
</head>
<body>
	<form id="form1" runat="server">
        <h3>Your note taking preferences</h3>
        <p><asp:RadioButton id="rdbPencil" Text="Pencil" runat="server" GroupName="NoteGroup" /></p>
        <p><asp:RadioButton id="rdbPen" Text="Pen" runat="server" GroupName="NoteGroup" /></p>
        <p><asp:RadioButton id="rdbPhone" Text="Phone" runat="server" GroupName="NoteGroup" /></p>
        <p><asp:RadioButton id="rdbTablet" Text="Tablet" runat="server" GroupName="NoteGroup" /></p>
        <p><asp:Button id="btnOk" runat="server" Text="Ok" OnClick="btnOkClicked" /></p>
        <br/>
        <p><asp:Image id="imgResult" runat="server" ImageUrl="" /></p>
        <p><asp:Label id="lblResult" runat="server" Text=""/></p>    
	</form>
</body>
</html>

Default.aspx.cs：

using System;
using System.Web;
using System.Web.UI;

namespace Challenge12Proj
{

    public partial class Default : System.Web.UI.Page
    {
        public void btnOkClicked(object sender, EventArgs args)
        {
            lblResult.Text = (rdbPen.Checked) ? "You selected Pen"
                : (rdbPencil.Checked) ? "You selected Pencil"
                : (rdbPhone.Checked) ? "You selected Phone" 
                : (rdbTablet.Checked) ? "You selected Tablet" : "Please select an option";
            imgResult.ImageUrl = (rdbPen.Checked) ? "/images/pen_PNG.png"
                : (rdbPencil.Checked) ? "/images/pencil_PNG.png"
                : (rdbPhone.Checked) ? "/images/smartphone_PNG.png"
                : (rdbTablet.Checked) ? "/images/tablet_PNG.png" : "";
            imgResult.Width = (rdbPen.Checked) ? new System.Web.UI.WebControls.Unit("450px")
                : (rdbPencil.Checked) ? new System.Web.UI.WebControls.Unit("250px")
                : (rdbPhone.Checked) ? new System.Web.UI.WebControls.Unit("250px")
                : (rdbTablet.Checked) ? new System.Web.UI.WebControls.Unit("300px") 
                : new System.Web.UI.WebControls.Unit("");
            imgResult.Height = (rdbPen.Checked) ? new System.Web.UI.WebControls.Unit("150px")
                : (rdbPencil.Checked) ? new System.Web.UI.WebControls.Unit("200px")
                : (rdbPhone.Checked) ? new System.Web.UI.WebControls.Unit("350px")
                : (rdbTablet.Checked) ? new System.Web.UI.WebControls.Unit("250px")
                : new System.Web.UI.WebControls.Unit("");

        }
    }
}

当选择任何单选按钮时，它的效果很好，但是当没有选择任何单选按钮时，它会向我显示错误。

我看到了必须通过以下方式删除它的答案：

禁用事件验证（不好的主意，因为您损失了很少的安全性，而付出的代价却很小）。

那么，如果这是一个坏主意，为什么它是一个好答案？

链接：Invalid postback or callback...

如何使用eventValidation =“ true”解决该问题？

它如何用于VS2010（来自视频教程）？

System.ArgumentException

无效的回发或回调参数。使用配置或页面中的<％@页面EnableEventValidation =“ true”％>启用事件验证。为了安全起见，此功能验证回发或回调事件的参数源自最初呈现它们的服务器控件。如果数据有效且预期，请使用ClientScriptManager.RegisterForEventValidation方法来注册回发或回调数据以进行验证。

说明： HTTP500。错误处理请求。

详细信息：非网络异常。异常来源（应用程序或对象的名称）：System.Web。

异常堆栈跟踪：

at System.Web.UI.ClientScriptManager.ValidateEvent (System.String uniqueId, System.String argument) [0x00060] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI/ClientScriptManager.cs:521 
  at System.Web.UI.Control.ValidateEvent (System.String uniqueId, System.String argument) [0x00012] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI/Control.cs:2029 
  at System.Web.UI.WebControls.RadioButton.LoadPostData (System.String postDataKey, System.Collections.Specialized.NameValueCollection postCollection) [0x0001a] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI.WebControls/RadioButton.cs:118 
  at System.Web.UI.WebControls.RadioButton.System.Web.UI.IPostBackDataHandler.LoadPostData (System.String postDataKey, System.Collections.Specialized.NameValueCollection postCollection) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI.WebControls/RadioButton.cs:135 
  at System.Web.UI.Page.ProcessPostData (System.Collections.Specialized.NameValueCollection data, System.Boolean second) [0x001c3] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI/Page.cs:1153 
  at System.Web.UI.Page.ProcessPostData () [0x00025] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI/Page.cs:1360 
  at System.Web.UI.Page.InternalProcessRequest () [0x001a1] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI/Page.cs:1337 
  at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x0005f] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/System.Web/System.Web.UI/Page.cs:1190

System.ArgumentException非Web异常。异常来源（应用程序或对象的名称）：System.Web。页面EnableEventValidation =“ true”

0 个答案: