c# - asp.net 中服务器传输中的 ThreadAbortException

Question

我收到错误 Unable to evaluate expression because the code is optimized or a native frame is on the top of the call stack. while executing line

Server.Transfer("Payment.aspx?vpc_ChannelId=2", true);

正如这个答案所指出的那样 https://stackoverflow.com/a/1252119/1169180 & https://stackoverflow.com/a/11130517/1169180

我将我的代码更改为

  protected void Page_Load(object sender, EventArgs e)
{
    try
    {
    UserContext conObj = new UserContext();
    HttpContext CurrContext = HttpContext.Current;
    if (!IsPostBack)
    {
        // Code
    }
    else
    {
        string userContext = hdnContextObj.Value;
        conObj = JsonConvert.DeserializeObject<UserContext>(userContext);
        CurrContext.Items.Add("Context", conObj);
        try
        {
        Server.Transfer("Payment.aspx?vpc_ChannelId=2", true);
        }
        catch (ThreadAbortException xObj)
        {
        }
        finally
        {
        Server.Transfer("Payment.aspx?vpc_ChannelId=2", true);
        }
    }
    }
    catch (Exception xObj)
    {
    Response.Write("Exception : " + xObj.Message);
    }
}

我仍然在 out catch block 中遇到相同的异常

也正如这里指出的那样http://support.microsoft.com/kb/312629/EN-US/我使用了 Server.Execute 但它没有重定向到 Payment.aspx 页面，而是只是刷新。

Answer 1

引发异常是因为运行该操作的线程由于传输而被迫在多个位置终止。因此，按照链接答案的建议忽略此异常是安全的。

您可以通过捕获异常而不抛出异常来忽略异常。

try
{
    Server.Transfer("Payment.aspx?vpc_ChannelId=2", true);
}
catch(ThreadAbortException)
{
    // Exception ignored: Thread Abort = discontinue processing on the current page
}

或者，作为 MSDN文章建议，您可以改用 Server.Execute。

To work around this problem, use one of the following methods:

• For Response.End, call the HttpContext.Current.ApplicationInstance.CompleteRequest method instead of Response.End to bypass the code execution to the Application_EndRequest event.

• For Response.Redirect, use an overload, Response.Redirect(String url, bool endResponse) that passes false for the endResponse parameter to suppress the internal call to Response.End. For example:

    Response.Redirect ("nextpage.aspx", false);
  

  If you use this workaround, the code that follows Response.Redirect is executed.

• For Server.Transfer, use the Server.Execute method instead.

//关于Server.Execute 的说明

MSDN文档阐明了 Server.Execute 的用法。重要的是要记住这不是重定向，它就像一个函数调用。所以调用之后的任何代码也将被执行。如果您不想执行代码，可以使用 return 或 Response.End。

在 OP 的示例中，他的代码在使用 Server.Execute 时可能看起来像这样

protected void Page_Load(object sender, EventArgs e)
{
    try
    {
       UserContext conObj = new UserContext();
       HttpContext CurrContext = HttpContext.Current;
       if (!IsPostBack)
       {
           // Code
       }
       else
       {
           string userContext = hdnContextObj.Value;
           conObj = JsonConvert.DeserializeObject<UserContext>(userContext);
           CurrContext.Items.Add("Context", conObj);
           Server.Execute("Payment.aspx?vpc_ChannelId=2", true);
           Response.End(); // or return;
       }
    }
    catch (Exception xObj)
    {
       Response.Write("Exception : " + xObj.Message);
    }
}