Question

当我在选择了视图的情况下向DataTable插入一行时，似乎我的应用程序崩溃了。据推测，这与一些交叉线程问题有关，但我并不完全确定如何解决它。这是我对DataTable的定义：

public class Logging
{
    public DataTable Logs;

    public Logging()
    {
        Logs = new DataTable();
        Logs.Columns.Add("Level", typeof(int));
        Logs.Columns.Add("Message", typeof(string));
    }

    public void LogMessage(int level, string message)
    {
        DataRow row = Logs.NewRow();
        row["Level"] = level;
        row["Message"] = message;
        Logs.Rows.Add(row);
    }
}

这会按照我的预期生成DataTable，并且工作正常。然后我将它绑定到WPF ListView控件，如下所示：

    <ListView x:Name="lvConsole">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="Level" Width="50" DisplayMemberBinding="{Binding Path=Level}"/>
                <GridViewColumn Header="Message" Width="376" DisplayMemberBinding="{Binding Path=Message}"/>
            </GridView>
        </ListView.View>
    </ListView>

还可以将其添加到C＃：

中

lvConsole.ItemsSource = Util.Logger.Logs.DefaultView;

因此，为了产生问题，我只需打开包含列表视图的表单，单击它并滚动一点，我收到以下错误：

An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll

Additional information: An ItemsControl is inconsistent with its items source.

查看更多细节，看来这是潜在的问题：

{"Information for developers (use Text Visualizer to read this):\r\nThis exception was thrown because the generator for control 'System.Windows.Controls.ListView Items.Count:20' with name 'lvConsole' has received sequence of CollectionChanged events that do not agree with the current state of the Items collection.  The following differences were detected:\r\n  Accumulated count 12 is different from actual count 20.  [Accumulated count is (Count at last Reset + #Adds - #Removes since last Reset).]\r\n\r\nOne or more of the following sources may have raised the wrong events:\r\n     System.Windows.Controls.ItemContainerGenerator\r\n      System.Windows.Controls.ItemCollection\r\n       System.Windows.Data.BindingListCollectionView\r\n        System.Data.DataView\r\n(The starred sources are considered more likely to be the cause of the problem.)\r\n\r\nThe most common causes are (a) changing the collection or its Count without raising a corresponding event, and (b) raising an event with an incorrect index or item parameter.\r\n\r\nThe exception's stack trace describes how the inconsistencies were detected, not how they occurred.  To get a more timely exception, set the attached property 'PresentationTraceSources.TraceLevel' on the generator to value 'High' and rerun the scenario.  One way to do this is to run a command similar to the following:\n   System.Diagnostics.PresentationTraceSources.SetTraceLevel(myItemsControl.ItemContainerGenerator, System.Diagnostics.PresentationTraceLevel.High)\r\nfrom the Immediate window.  This causes the detection logic to run after every CollectionChanged event, so it will slow down the application.\r\n"}

有谁知道我需要做些什么来解决这个问题？我尝试了很多东西，其中之一就是：

private static object _syncLock = new object();

BindingOperations.EnableCollectionSynchronization(Logs.Rows, _syncLock);

这似乎没有做任何有用的事情，也许它与我一次从两个线程调用LogMessage有关？

Answer 1

我很确定我找到了一个好的解决方法，但不确定它会持续多长时间。我会分享它，不管希望它是对的......

    private void logMessage(object parameters)
    {
        object[] Paras = (object[])parameters;
        int level = Convert.ToInt32(Paras[0]);
        string message = (string)(Paras[1]);
        DataRow row = Logs.NewRow();
        row["Level"] = level;
        row["Message"] = message;
        Logs.Rows.Add(row);
    }

    public void LogMessage(int level, string message)
    {
        object lvl = Convert.ToString(level);
        object msg = message;
        object[] ob = { lvl, msg };
        if (Util.client.player.isRunning)
        {
            Application.Current.Dispatcher.Invoke(DispatcherPriority.Background, new ParameterizedThreadStart(logMessage), ob);
            ParameterizedThreadStart pts = new ParameterizedThreadStart(logMessage);
        }
    }

我必须创建一个新方法，它使用应用程序调度程序来调用编辑列表的方法，如果我更正，将从应用程序主线程编辑列表（巧合的是，不是写入列表的那个，而是那个不断显示它的那个。）

这一切都相当混乱，如果其他人能想出更好的解释方法，请继续：）

更新DataTable会导致崩溃

1 个答案: