自定义WebBrowser（winforms）代码的致命错误 [英] Fatal error on Custom WebBrowser (winforms) code

问题描述

在CustomWebBrowser（winforms）代码上产生致命异常。

运行时遇到致命错误。错误的地址在0x6c9a60c6，在线程0xf94。错误代码为0xc0000005。此错误可能是CLR中的错误或用户代码的不安全或不可验证部分中的错误。这个bug的常见来源包括COM-interop或PInvoke的用户封送错误，这可能会破坏堆栈。

.Net Framework 4.0 安装 .Net Framework 4.5 ，但不适用于

< p $ p> //构造函数
public AutoCompleteWebBrowserSite（WebBrowser host）：
base（host）
{

//获取CCW object for this
_unkOuter = Marshal.GetIUnknownForObject（this）;
Marshal.AddRef（_unkOuter）;
try
{
//用帮助器聚合CCW对象内部对象
_inner = new AutoCompleteHelper（this）;
_unkInnerAggregated = Marshal.CreateAggregatedObject（_unkOuter，_inner）;

//获取私有WebBrowserSite COM接口
try
{
_baseIDocHostUiHandler =（WebBrowserNativeMethods.IDocHostUIHandler）Marshal.GetTypedObjectForIUnknown（_unkInnerAggregated，typeof（WebBrowserNativeMethods.IDocHostUIHandler））;
}
catch（Exception）
}
finally
{
Marshal.Release（_unkOuter）;
}
}


异常抛出在 _baseIDocHostUiHandler =（WebBrowserNativeMethods.IDocHostUIHandler）Marshal.GetTypedObjectForIUnknown（_unkInnerAggregated，typeof（WebBrowserNativeMethods.IDocHostUIHandler））;

也尝试了通过在app.config文件中禁用gcConcurrent禁用并发垃圾回收

$ b $

解决方案

基本上需要从构造函数中删除所有的代码主要是_baseIDocHostUiHandler）

然后在WebBrowserSite实现中，尝试返回每个方法的默认实现值。

  private const int DefaultImpVal = unchecked（（int）0x80004001）
 
 #region IDocHostUIHandler 
 int WebBrowserNativeMethods.IDocHostUIHandler.ShowContextMenu（int dwId，ref WebBrowserNativeMethods .Point pt，IntPtr pcmdtReserved，IntPtr pdispReserved）
 {
 return DefaultImpVal; 
} 
 
 int WebBrowserNativeMethods.IDocHostUIHandler.ShowUI（int dwId，IntPtr activeObject，IntPtr commandTarget，IntPtr frame，IntPtr doc）
 {
 return DefaultImpVal; 
} 
  

。

Getting a fatal exception on the CustomWebBrowser (winforms) code.

"The runtime has encountered a fatal error. The address of the error was at 0x6c9a60c6, on thread 0xf94. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack."

This is working fine on machines that has .Net Framework 4.5 installed, however not in machines with .Net framework 4.0

// constructor
    public AutoCompleteWebBrowserSite(WebBrowser host) :
        base(host)
    {

        // get the CCW object for this
        _unkOuter = Marshal.GetIUnknownForObject(this);
        Marshal.AddRef(_unkOuter);
        try
        {
            // aggregate the CCW object with the helper Inner object
            _inner = new AutoCompleteHelper(this);
            _unkInnerAggregated = Marshal.CreateAggregatedObject(_unkOuter, _inner);

            // obtain private WebBrowserSite COM interfaces
            try
            {
                _baseIDocHostUiHandler = (WebBrowserNativeMethods.IDocHostUIHandler)  Marshal.GetTypedObjectForIUnknown(_unkInnerAggregated,typeof (WebBrowserNativeMethods.IDocHostUIHandler));
            }
            catch(Exception)
        }
        finally
        {
            Marshal.Release(_unkOuter);
        }
    }

The exception was thrown at _baseIDocHostUiHandler = (WebBrowserNativeMethods.IDocHostUIHandler)Marshal.GetTypedObjectForIUnknown(_unkInnerAggregated,typeof (WebBrowserNativeMethods.IDocHostUIHandler));

Also tried disabling concurrent garbage collection by disabling gcConcurrent in the app.config file

Any help would be really appreciated.

解决方案

Basically need to remove all the code from constructor (mainly _baseIDocHostUiHandler)

And then in the WebBrowserSite implementation, try return the default implementation value for each of the methods.

   private const int DefaultImpVal = unchecked((int)0x80004001)

  #region IDocHostUIHandler
            int WebBrowserNativeMethods.IDocHostUIHandler.ShowContextMenu(int dwId, ref WebBrowserNativeMethods.Point pt, IntPtr pcmdtReserved, IntPtr pdispReserved)
            {
                return DefaultImpVal ;
            }

int WebBrowserNativeMethods.IDocHostUIHandler.ShowUI(int dwId, IntPtr activeObject, IntPtr commandTarget, IntPtr frame, IntPtr doc)
            {
                return DefaultImpVal;
            }

similarly for other methods.

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