C# KeyNotFoundException:SQLCE数据库异常

我正在使用C#中的数据集。我已经做了一个项目数量的直接计数 SQL CE数据库，因此我知道数据库中有多少项。数据库中没有删除项

我收到以下无法解释的异常：

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System.Data.SqlServerCe.dll中出现“System.Data.SqlServerCe.SqlCeException”类型的第一次意外异常

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在mscorlib.dll KeyNotFoundException中发生“System.Collections.Generic.KeyNotFoundException”类型的第一次意外异常

这显示了与SQL CE数据库的通信锁定的位置

有人知道这是什么原因吗？如何解决

我在网上搜索过，但没有找到任何解决方案：-(

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通常情况下，您不必担心第一次出现异常。它们通常是由dll中的较低级别代码预期和处理的

关于第一次机会的例外情况有一篇不错的评论

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您也可以在Visual Studio中使用（对于VS 2005…2008年不确定）。

我还将包括这两个例外的完整堆栈跟踪—不需要将ds分配给null（实际上可能会导致性能降低）DataSet还实现了IDisposable，因此您应该将其放入一个块中。在不属于您控件的对象上使用块锁定也是一种不好的做法。您不知道其他人是否正在使用同一对象进行锁定（尽管这也是一种不好的做法）并可能导致死锁System.Data.SqlServerCe.SqlCeException类型的第一次机会异常发生在System.Data.SqlServerCe.dll中System.Data.SqlServerCe.SqlCeException类型的第一次机会异常发生在System.Data.SqlServerCe.dll中mscorlib.dll中System.FormatException类型的第一次机会异常第一次机会mscorlib.dll中出现“System.FormatException”类型的异常mscorlib.dll中出现“System.Collections.Generic.KeyNotFoundException”类型的第一次意外异常KeyNotFoundException没有更改，因为我已经取消将所有输出窗口文本重定向到即时窗口的设置。一旦收到异常，它将停止数据库访问。Pl你能进一步解释一下吗？是什么导致这些？我怎样才能摆脱它们？？

        // List to be created
        List<TableDat> result = null;
        lock (_sqlcn)
        {
            // Assumes that connection is a valid SqlConnection object.
            SqlCeDataAdapter adapter = new SqlCeDataAdapter(orderSQL, _sqlcn);
            try
            {
                // DataSet that will be returned.
                System.Data.DataSet ds = new System.Data.DataSet();
                int count = adapter.Fill(ds, currentIndex, PageSize, "Logs");


                //Iterate through the table and in the List 
                foreach (System.Data.DataRow myDataRow in ds.Tables["Logs"].Rows)
                {
                    if (result == null)
                    {
                        result = new List<TableDat>();
                    }
                    result.Add(
                              new TableDat(
                                  (int)myDataRow[Resources.ID],
                                  (DateTime)myDataRow[Resources.TimeStamp],
                                  (int)myDataRow[Resources.EVENTLOG_SID],
                                  (int)myDataRow[Resources.EVENTLOG_EID])
                              );

                }
                // Set the dataSet object to NULL : No longer needed as the list 
                // has  been populated
                ds = null;
            }

A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in System.dll
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.SqlServerCe.dll
A first chance exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.SqlServerCe.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.Collections.Generic.KeyNotFoundException' occurred in mscorlib.dll
KeyNotFoundException
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll