Question

我在C＃中使用EConnect集成Windows表单应用程序。我在测试连接字符串时遇到了很多麻烦。基本上我给用户提供了更改连接字符串的选项，所以我希望能够测试它。据我所知，EConnect没有任何内置函数可以测试连接，所以我正在编写一个非常粗略的函数来自己完成。仅针对每个人的信息，连接字符串由GP数据库所在的服务器名称和数据库名称组成。

我认为实际测试函数的细节很重要，但主要问题是在该函数中我称之为getEntity的eConnect方法，此方法使用连接字符串，如果连接字符串是正确的，它将提取信息。如果数据库名称错误，则getEntity方法将返回一个易于捕获的eConnect异常，但是如果服务器名称错误，则getEntity方法将旋转并且我的应用程序卡住。

我试着写一些东西，我可以异步运行我的测试函数，同时检查超时或econnect异常。这是我被困的地方，我不能让我的生活得到它的工作。这是我尝试的第一件事（这是我的TestConnection方法）：

task = Task.Factory.StartNew(() => requester.GetEntity(GPCongfigSettings.GPConnectionString, myXmlDocument.OuterXml), token);

try
{
    if (!task.Wait(timeOut, token))
    {
        Console.WriteLine("The server name is incorrect - task timed out");
        return false;
    }
}
catch (ThreadInterruptedException)
{
return false;
}
catch (AggregateException ae)
{
    ae.Handle((x) =>
    {
        if (x is eConnectException) // This we know how to handle.
        {
            Console.WriteLine("Incorrect Database Name! -- " + x.Message);
            return false;
        }
        return false; // Let anything else stop the application.
    });

}

这将捕获服务器出错的情况以及我的econnect方法是否会超时。但它从未捕获到eConnect异常，Visual Studio会破坏应用程序并告诉我有一个未处理的异常。

这是我现在正在尝试的，这是我对我的表格的完整课程。在这里，我试图使用IAsyncResult并使用WaitHandle来检查函数是完成还是超时。这似乎有时工作，它适用于正确的字符串和数据库错误时，有时它适用于服务器错误，但一旦我测试错误的服务器名称它不再适用于其他任何事情。有没有我缺少的东西，或者有更好的方法在TestGPConnection中运行getentity方法，并检查它是否在一段时间后没有完成，如果它没有杀死该方法并让用户重新输入服务器名称？ / p>

public partial class UpdateGPConnection : Form
{
    Task task;
    AsyncCallback cb;
    public delegate string startProcessToCall();
    startProcessToCall sp2c;       

    public UpdateGPConnection()
    {
        InitializeComponent();
        this.txtDatasourceName.Text = ConfigurationManager.AppSettings.Get("GPDataServer");
        this.txtDatabaseName.Text = ConfigurationManager.AppSettings.Get("GPDatabase");                   

        cb = new AsyncCallback(startProcessCallback);
        sp2c = new startProcessToCall(TestGPConnection);
    }

    public void startProcessCallback(IAsyncResult iar)
    {
        startProcessToCall mc = (startProcessToCall)iar.AsyncState;
        bool result = mc.EndInvoke(iar);
        Console.WriteLine("Function value = {0}", result);
    }

    private void btnUpdate_Click(object sender, EventArgs e)
    {
        var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        config.AppSettings.Settings["GPDataServer"].Value = txtDatasourceName.Text.ToUpper();
        config.AppSettings.Settings["GPDatabase"].Value = txtDatabaseName.Text.ToUpper();
        config.Save(ConfigurationSaveMode.Modified);

        ConfigurationManager.RefreshSection("appSettings");

        GPCongfigSettings.GPConnectionString = @"data source=" + txtDatasourceName.Text.ToUpper() + ";initial catalog=" + txtDatabaseName.Text.ToUpper() + ";integrated security=SSPI;persist security info=False;packet size=4096";

        IAsyncResult asyncResult = null;
        asyncResult = sp2c.BeginInvoke(cb, null);
        timer1.Enabled = true;

        Thread.Sleep(0);

        bool test = asyncResult.AsyncWaitHandle.WaitOne(15000);

        if (test)
        {
            try
            {
                string testResult = sp2c.EndInvoke(asyncResult);
            }
            catch (Exception exc)
            {
                Console.WriteLine(exc.Message);
            }
        }



        bool result = asyncResult.IsCompleted;

        asyncResult.AsyncWaitHandle.Close();

        this.Close();
    }



    public string TestGPConnection()
    {

        eConnectMethods requester = new eConnectMethods();
        try
        {                

            // Create an eConnect document type object
            eConnectType myEConnectType = new eConnectType();

            // Create a RQeConnectOutType schema object
            RQeConnectOutType myReqType = new RQeConnectOutType();

            // Create an eConnectOut XML node object
            eConnectOut myeConnectOut = new eConnectOut();

            // Populate the eConnectOut XML node elements
            myeConnectOut.ACTION = 1;
            myeConnectOut.DOCTYPE = "GL_Accounts";
            myeConnectOut.OUTPUTTYPE = 2;
            myeConnectOut.FORLIST = 1;
            myeConnectOut.WhereClause = "(ACTNUMST = '99-9999-99-999')";

            // Add the eConnectOut XML node object to the RQeConnectOutType schema object
            myReqType.eConnectOut = myeConnectOut;

            // Add the RQeConnectOutType schema object to the eConnect document object
            RQeConnectOutType[] myReqOutType = { myReqType };
            myEConnectType.RQeConnectOutType = myReqOutType;

            // Serialize the eConnect document object to a memory stream
            MemoryStream myMemStream = new MemoryStream();
            XmlSerializer mySerializer = new XmlSerializer(myEConnectType.GetType());
            mySerializer.Serialize(myMemStream, myEConnectType);
            myMemStream.Position = 0;

            // Load the serialized eConnect document object into an XML document object
            XmlTextReader xmlreader = new XmlTextReader(myMemStream);
            XmlDocument myXmlDocument = new XmlDocument();
            myXmlDocument.Load(xmlreader);

            string reqDoc = requester.GetEntity(GPCongfigSettings.GPConnectionString, myXmlDocument.OuterXml);

            return "Correct Connection";


        }
        catch (eConnectException exc)
        {
            Console.WriteLine(exc.Message);
            return "eConnect Excpetion";
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            return "Excpetion";
        }
    }

    private void btnExit_Click(object sender, EventArgs e)
    {
        this.Close();
    }


}

Answer 1

您没有处理eConnectException。您正在Console中显示一条消息，然后通过返回false重新抛出异常。

如果你做处理异常，那么你应该返回true以避免重新抛出它：

catch (AggregateException ae)
{
    ae.Handle((x) =>
    {
        if (x is eConnectException) // This we know how to handle.
        {
            Console.WriteLine("Incorrect Database Name! -- " + x.Message);
        }

        return x is eConnectException; //rethrow anything that is not an eConnectException
    });
}

在指定时间后终止函数

1 个答案: