您好，附加说明的链接简短说明：System.Timers.Timer是一个专门用于服务器的后台线程（基于Thread构建）。你用这个后台线程控制一个前台的控件会产生此错误。因此内部应该用前台线程调用。
由于问题尚未解决，我取消标记答案，您可以尝试此方法：
1）重新创造一个新的C#类，黏贴一下代码（从Form2中移除，不建议把无关的代码放入Form2窗体中，否则会导致设计器无法正常工作打开）：
[ComImport(), ComVisible(true), Guid("6D5140C1-7436-11CE-8034-00AA006009FA"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IServiceProvider
{
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int QueryService(ref Guid guidService, ref Guid riid, [MarshalAs(UnmanagedType.Interface)] out object ppvObject);
}
public enum OLECMDF
{
OLECMDF_DEFHIDEONCTXTMENU = 0x20,
OLECMDF_ENABLED = 2,
OLECMDF_INVISIBLE = 0x10,
OLECMDF_LATCHED = 4,
OLECMDF_NINCHED = 8,
OLECMDF_SUPPORTED = 1
}
public enum OLECMDID
{
OLECMDID_PAGESETUP = 8,
OLECMDID_PRINT = 6,
OLECMDID_PRINTPREVIEW = 7,
OLECMDID_PROPERTIES = 10,
OLECMDID_SAVEAS = 4
}
public enum OLECMDEXECOPT
{
OLECMDEXECOPT_DODEFAULT,
OLECMDEXECOPT_PROMPTUSER,
OLECMDEXECOPT_DONTPROMPTUSER,
OLECMDEXECOPT_SHOWHELP
}
[ComImport, Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E"), TypeLibType(TypeLibTypeFlags.FOleAutomation | TypeLibTypeFlags.FDual | TypeLibTypeFlags.FHidden)]
public interface IWebBrowser2
{
[DispId(100)]
void GoBack();
[DispId(0x65)]
void GoForward();
[DispId(0x66)]
void GoHome();
[DispId(0x67)]
void GoSearch();
[DispId(0x68)]
void Navigate([In] string Url, [In] ref object flags, [In] ref object targetFrameName, [In] ref object postData, [In] ref object headers);
[DispId(-550)]
void Refresh();
[DispId(0x69)]
void Refresh2([In] ref object level);
[DispId(0x6a)]
void Stop();
[DispId(200)]
object Application { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xc9)]
object Parent { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xca)]
object Container { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xcb)]
object Document { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xcc)]
bool TopLevelContainer { get; }
[DispId(0xcd)]
string Type { get; }
[DispId(0xce)]
int Left { get; set; }
[DispId(0xcf)]
int Top { get; set; }
[DispId(0xd0)]
int Width { get; set; }
[DispId(0xd1)]
int Height { get; set; }
[DispId(210)]
string LocationName { get; }
[DispId(0xd3)]
string LocationURL { get; }
[DispId(0xd4)]
bool Busy { get; }
[DispId(300)]
void Quit();
[DispId(0x12d)]
void ClientToWindow(out int pcx, out int pcy);
[DispId(0x12e)]
void PutProperty([In] string property, [In] object vtValue);
[DispId(0x12f)]
object GetProperty([In] string property);
[DispId(0)]
string Name { get; }
[DispId(-515)]
int HWND { get; }
[DispId(400)]
string FullName { get; }
[DispId(0x191)]
string Path { get; }
[DispId(0x192)]
bool Visible { get; set; }
[DispId(0x193)]
bool StatusBar { get; set; }
[DispId(0x194)]
string StatusText { get; set; }
[DispId(0x195)]
int ToolBar { get; set; }
[DispId(0x196)]
bool MenuBar { get; set; }
[DispId(0x197)]
bool FullScreen { get; set; }
[DispId(500)]
void Navigate2([In] ref object URL, [In] ref object flags, [In] ref object targetFrameName, [In] ref object postData, [In] ref object headers);
[DispId(0x1f5)]
OLECMDF QueryStatusWB([In] OLECMDID cmdID);
[DispId(0x1f6)]
void ExecWB([In] OLECMDID cmdID, [In] OLECMDEXECOPT cmdexecopt, ref object pvaIn, IntPtr pvaOut);
[DispId(0x1f7)]
void ShowBrowserBar([In] ref object pvaClsid, [In] ref object pvarShow, [In] ref object pvarSize);
[DispId(-525)]
WebBrowserReadyState ReadyState { get; }
[DispId(550)]
bool Offline { get; set; }
[DispId(0x227)]
bool Silent { get; set; }
[DispId(0x228)]
bool RegisterAsBrowser { get; set; }
[DispId(0x229)]
bool RegisterAsDropTarget { get; set; }
[DispId(0x22a)]
bool TheaterMode { get; set; }
[DispId(0x22b)]
bool AddressBar { get; set; }
[DispId(0x22c)]
bool Resizable { get; set; }
}
class CorssDomainHelper
{
private static Guid IID_IWebBrowserApp = new Guid("0002DF05-0000-0000-C000-000000000046");
private static Guid IID_IWebBrowser2 = new Guid("D30C1661-CDAF-11D0-8A3E-00C04FC9E26E");
// Utility for IE cross domain access
// Returns null in case of failure.
public static IHTMLDocument3 GetDocumentFromWindow(IHTMLWindow2 htmlWindow)
{
if (htmlWindow == null)
{
return null;
}
// First try the usual way to get the document.
try
{
IHTMLDocument2 doc = htmlWindow.document;
return (IHTMLDocument3)doc;
}
catch (COMException comEx)
{
// I think COMException won't be ever fired but just to be sure ...
}
catch (UnauthorizedAccessException)
{
}
catch (Exception ex)
{
return null;
}
// At this point the error was E_ACCESSDENIED because the frame contains a document from another domain.
// IE tries to prevent a cross frame scripting security issue.
try
{
// Convert IHTMLWindow2 to IWebBrowser2 using IServiceProvider.
IServiceProvider sp = (IServiceProvider)htmlWindow;
// Use IServiceProvider.QueryService to get IWebBrowser2 object.
Object brws = null;
sp.QueryService(ref IID_IWebBrowserApp, ref IID_IWebBrowser2, out brws);
// Get the document from IWebBrowser2.
IWebBrowser2 browser = (IWebBrowser2)(brws);
return (IHTMLDocument3)browser.Document;
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
return null;
}
}
2）在Form2中引入这个类，然后代码如下：
using System;
using System.Windows.Forms;
using System.Timers;
using mshtml;
namespace WindowsApplication41
{
public partial class Form2 : Form
{
System.Timers.Timer _timer = new System.Timers.Timer();
public Form2()
{
InitializeComponent();
int _Interval = 1000;
_timer.Enabled = true;
_timer.Interval = _Interval;
_timer.Elapsed += new ElapsedEventHandler(Timer_Elapsed);
}
private void Timer_Elapsed(object sender, ElapsedEventArgs e)
{
string CurrTime = System.DateTime.Now.ToLongTimeString();
string s = "15:43:00";
if (CurrTime == s)
{
this.Invoke(new MethodInvoker(() =>
{
string aaa = "179166873";
string bbb = "as13544975580";
IHTMLDocument3 aa = CorssDomainHelper.GetDocumentFromWindow(this.webBrowser1.Document.Window.Frames["miniLoginFrame"].DomWindow as IHTMLWindow2);
aa.getElementById("miniLogin_username").setAttribute("value", aaa, 0);
aa.getElementById("miniLogin_pwd").setAttribute("value", bbb, 0);
IHTMLElementCollection input = (IHTMLElementCollection)aa.getElementsByTagName("input");
foreach (IHTMLElement ht in input)
{
if (ht.getAttribute("type", 0).Equals("submit") != null)
{
ht.click();
break;
}
}
}));
}
}
private void button1_Click(object sender, EventArgs e)
{
}
private void Form2_Load(object sender, EventArgs e)
{
webBrowser1.Navigate("http://p.www.xiaomi.com/zt/xm_account/loginfacade.html?third=http%253A%252F%252Forder.xiaomi.com%252Flogin%252Fcallback%253Ffollowup%253Dhttp%25253A%25252F%25252Fwww.xiaomi.com%2526sign%253DMWM0ZDg1YWE3ZDc4NGJjNzU0MDM4MmRiNzY0ZWY0MDJlYTVkODBlZA%252C%252C%26sid%3Deshop&sid=eshop&callback=http%253A%252F%252Forder.xiaomi.com%252Flogin%252Fcallback%253Ffollowup%253Dhttp%25253A%25252F%25252Fwww.xiaomi.com%2526sign%253DMWM0ZDg1YWE3ZDc4NGJjNzU0MDM4MmRiNzY0ZWY0MDJlYTVkODBlZA%252C%252C&sign=3C15pt35v9KK5SR8saFsKQ89uRo%253D&1382244002316");
}
private void button2_Click(object sender, EventArgs e)
{
this.button2.Enabled = false;
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
if (webBrowser1.ReadyState == WebBrowserReadyState.Complete)
{
string aaa = "179166873";
string bbb = "as13544975580";
IHTMLDocument3 aa = CorssDomainHelper.GetDocumentFromWindow(this.webBrowser1.Document.Window.Frames["miniLoginFrame"].DomWindow as IHTMLWindow2);
aa.getElementById("miniLogin_username").setAttribute("value", aaa, 0);
aa.getElementById("miniLogin_pwd").setAttribute("value", bbb, 0);
IHTMLElementCollection input = (IHTMLElementCollection)
aa.getElementsByTagName("input");
foreach (IHTMLElement ht in input)
{
if (ht.getAttribute("type", 0).Equals("submit") != null)
{
ht.click();
}
}
}
}
}
}
注意粗体部分：
1）您不要在Button的Click事件中写操作Html文档的东西，必须放入DocumentComplete中（必须加载完毕）。
2）您必须用this.Invoke方法（通过UI线程操作）WebBrowser。
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