将密码传递给Gmail起诉C＃时出现空例外 [英] Null Exception while passing password to Gmail suing C#

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，< span class =code-keyword> 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< /跨度>; 
 

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 = "[e-mail]";
            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.exe

Additional 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!

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