C# 在FbRemoteEvent上填充DataGridView

我有一个MainForm（带有dataGridView）和DataModule类以及我自己的LoadDataTable方法，它们执行FbCommand select sql并在dataset和FbRemoteEvent catch方法中填充datatable。当我运行我的应用程序时，在MainForm_OnLoad中调用LoadDataTable方法，我的dataGridView成功显示数据。但当我的应用程序从服务器捕获FbRemoteEvent并调用LoadDataTable方法时，dataGridView中发生了异常。为什么?

MainForm:

public partial class MainForm : Form
{
    private readonly DataModule _dataModule = DataModule.GetInstance();

    public MainForm()
    {
        InitializeComponent();
    }

    private void MainForm_Load(object sender, EventArgs e)
    {
        dataGridView1.AutoGenerateColumns = false;
        dataGridView1.DataSource = _dataModule.AppDataSet;
        dataGridView1.DataMember = "MESSAGEQUEUE";
        _dataModule.LoadMessageQueueDataTable();
    }
}

    private void FirebirdRemoteEventOnRemoteEventCounts(object sender, FbRemoteEventEventArgs fbRemoteEventEventArgs)
        {
            switch (fbRemoteEventEventArgs.Name.Trim().ToUpper())
            {
                case "QUEUE_NEW_MESSAGE":
                    if (fbRemoteEventEventArgs.Counts > 0)
                    {
                        LoadMessageQueueDataTable();
                    }
                    break;
            }
        }

public void LoadMessageQueueDataTable()
        {
            if (ConnectToFirebird())
            {
                using (var firebirdTransaction = FirebirdConnection.BeginTransaction())
                {
                    using (var firebirdCommand = new FbCommand
                    {
                        Connection = firebirdTransaction.Connection,
                        Transaction = firebirdTransaction,
                        CommandType = CommandType.Text,
                        CommandText = "select MESSAGEQUEUEID, CREATEDATETIME, SENDER, RECIPIENT, TEXT from MESSAGEQUEUE"
                    })
                    {
                        AppDataSet.Tables["MESSAGEQUEUE"].Clear();
                        try
                        {
                            AppDataSet.Tables["MESSAGEQUEUE"].Load(firebirdCommand.ExecuteReader());
                            firebirdCommand.Transaction.Commit();
                        }
                        catch (FbException firebirdException)
                        {
                            firebirdCommand.Transaction.Rollback();
                        }
                    }
                }
            }
        }

数据模块：

public partial class MainForm : Form
{
    private readonly DataModule _dataModule = DataModule.GetInstance();

    public MainForm()
    {
        InitializeComponent();
    }

    private void MainForm_Load(object sender, EventArgs e)
    {
        dataGridView1.AutoGenerateColumns = false;
        dataGridView1.DataSource = _dataModule.AppDataSet;
        dataGridView1.DataMember = "MESSAGEQUEUE";
        _dataModule.LoadMessageQueueDataTable();
    }
}

    private void FirebirdRemoteEventOnRemoteEventCounts(object sender, FbRemoteEventEventArgs fbRemoteEventEventArgs)
        {
            switch (fbRemoteEventEventArgs.Name.Trim().ToUpper())
            {
                case "QUEUE_NEW_MESSAGE":
                    if (fbRemoteEventEventArgs.Counts > 0)
                    {
                        LoadMessageQueueDataTable();
                    }
                    break;
            }
        }

public void LoadMessageQueueDataTable()
        {
            if (ConnectToFirebird())
            {
                using (var firebirdTransaction = FirebirdConnection.BeginTransaction())
                {
                    using (var firebirdCommand = new FbCommand
                    {
                        Connection = firebirdTransaction.Connection,
                        Transaction = firebirdTransaction,
                        CommandType = CommandType.Text,
                        CommandText = "select MESSAGEQUEUEID, CREATEDATETIME, SENDER, RECIPIENT, TEXT from MESSAGEQUEUE"
                    })
                    {
                        AppDataSet.Tables["MESSAGEQUEUE"].Clear();
                        try
                        {
                            AppDataSet.Tables["MESSAGEQUEUE"].Load(firebirdCommand.ExecuteReader());
                            firebirdCommand.Transaction.Commit();
                        }
                        catch (FbException firebirdException)
                        {
                            firebirdCommand.Transaction.Rollback();
                        }
                    }
                }
            }
        }

错误：

---

在DataModule类中添加和更改FbRemoteEvent处理程序：

public delegate void DelegateMessageQueueTableUpdate();
public event DelegateMessageQueueTableUpdate MessageQueueTableUpdate;

private void FirebirdRemoteEventOnRemoteEventCounts(object sender, FbRemoteEventEventArgs fbRemoteEventEventArgs)
        {
            switch (fbRemoteEventEventArgs.Name.Trim().ToUpper())
            {
                case "QUEUE_NEW_MESSAGE":
                    if (fbRemoteEventEventArgs.Counts > 0)
                    {
                        if (MessageQueueTableUpdate != null)
                        {
                            MessageQueueTableUpdate();
                        }
                    }
                    break;
            }
        }

主要形式：

public partial class MainForm : Form
    {
        private readonly DataModule _dataModule = DataModule.GetInstance();

        private delegate void RefreshMessageQueueTable();

        public MainForm()
        {
            InitializeComponent();
            _dataModule.MessageQueueTableUpdate += () =>
            {
                if (dataGridView1.InvokeRequired)
                {
                    dataGridView1.Invoke(new RefreshMessageQueueTable(_dataModule.LoadMessageQueueDataTable));
                }
                else
                {
                    _dataModule.LoadMessageQueueDataTable();
                }
            };
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            dataGridView1.DataSource = _dataModule.AppDataSet;
            dataGridView1.DataMember = "MESSAGEQUEUE";
            _dataModule.LoadMessageQueueDataTable();
        }
    }

---

你能改为显示英文错误信息吗。另外，您是在事件线程上还是在其他线程上填充数据集？@DataGridView中的MarkRotterVeel异常：System.IndexOutOfRangeException:未设置索引0。在System.Windows.Forms.CurrencyManager.get_项（Int32索引）中，在System.Windows.Forms.DataGridView.DataGridViewDataConnection.GetError（Int32 rowIndex）中若要替换此默认窗口，请处理事件DataError。@MarkRotVeel捕获FBRemoteEvent时，我不会创建另一个线程来加载datatable。据我所知，Firebird事件是在另一个线程上处理的（虽然不是100%确定）@MarkRotVeel如果我们直接在可视组件中更新数据，我认为可以使用委托。但数据集不是可视组件，也没有InvokeRequired属性。。。最奇怪的是，一个类似的项目在成功的工作，但我找不到这部分项目之间的差异。