本文介绍了将密码传递给Gmail起诉C#时出现空例外的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 我正在尝试创建一个网页表单,点击按钮将在IE中打开Gmail。 下面是我正在使用的代码,当我运行它并点击打开Gmail按钮时,我在下划线处收到错误。 我试过Passwd和passwd隐藏但是得到相同的错误。 另外,我想知道如何从安全的地方读取密码而不是用代码硬编码。 感谢您提前的帮助。 private void button2_Click( object sender,EventArgs e) { // 第二次尝试 // 打开Gmail InternetExplorer explorer = new InternetExplorer(); explorer.DocumentComplete + = OnIEDocumentComplete; // 将documentComplete事件设置为false documentComplete = new AutoResetEvent( false ); object mVal = System.Reflection.Missing.Value; explorer.Navigate( http://www.gmail.com, ref mVal, ref mVal, ref mVal, ref mVal); // 等待文档完全加载 documentComplete .WaitOne(); HTMLDocument doc =(HTMLDocument)explorer.Document; HTMLInputElement userID =(HTMLInputElement)doc.all.item( Email, 0 ); userID。 value = abc @ gmail .COM; HTMLInputElement pwd =(HTMLInputElement)doc.all.item( Passwd-hidden, 0 ); pwd。 value = abcdef; HTMLInputElement btnsubmit =(HTMLInputElement)doc.all.item( signIn, 0 ); btnsubmit.click(); explorer.Visible = true ; } 错误: 未处理的例外情况在WindowsFormsApplication1.exe中输入'System.NullReferenceException' 附加信息:对象引用未设置为对象的实例。解决方案 如果你在这一行收到错误: pwd。 value = abcdef; 然后 pwd 必须为空。所以看看它的设置位置 - 在这种情况下如上所示: HTMLInputElement pwd =(HTMLInputElement)doc.all.item( Passwd-hidden, 0 ); pwd。 value = abcdef; 显然 doc.all.item 返回 null ,这几乎是肯定意味着它找不到一个名为Passwd-hidden的匹配项目。 所以检查页面数据,找出它的名字! Hi,I am trying to create a web form where clicking on button will open Gmail in IE.Below is the code I am using, when I run it and click on Open Gmail button I am getting error at underlined line.I have tried both Passwd and passwd-hidden but get same error. Also, I want to know how can I read my password from a secure place and not hardcode it in code.Thanks for your help in advance.private void button2_Click(object sender, EventArgs e) { //second try //open Gmail InternetExplorer explorer = new InternetExplorer(); explorer.DocumentComplete += OnIEDocumentComplete; // Setting the documentComplete Event to false documentComplete = new AutoResetEvent(false); object mVal = System.Reflection.Missing.Value; explorer.Navigate("http://www.gmail.com", ref mVal, ref mVal, ref mVal, ref mVal); // Waiting for the document to load completely documentComplete.WaitOne(); HTMLDocument doc = (HTMLDocument)explorer.Document; HTMLInputElement userID = (HTMLInputElement)doc.all.item("Email", 0); userID.value = "[email protected]"; HTMLInputElement pwd = (HTMLInputElement)doc.all.item("Passwd-hidden", 0); pwd.value = "abcdef"; HTMLInputElement btnsubmit = (HTMLInputElement)doc.all.item("signIn", 0); btnsubmit.click(); explorer.Visible = true; }Error:An unhandled exception of type 'System.NullReferenceException' occurred in WindowsFormsApplication1.exeAdditional information: Object reference not set to an instance of an object. 解决方案 If you are getting the error on this line:pwd.value = "abcdef";Then pwd has to be null. So look at where it is set - in teh line above in this case:HTMLInputElement pwd = (HTMLInputElement)doc.all.item("Passwd-hidden", 0);pwd.value = "abcdef";So clearly doc.all.item is returning null, which almost certainly means it can't find a matching item called "Passwd-hidden".So check the page data, and find out what it is called! 这篇关于将密码传递给Gmail起诉C#时出现空例外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! 10-22 07:34