纠正这段代码的错误

Question

#region Receiving 
public void port_DataReceived(object sender, SerialDataReceivedEventArgs e) 
{ 
    int bytes = serial.BytesToRead; 
    byte[] buffer = new byte[bytes]; 
    serial.Read(buffer, 0, bytes); 
    int length = buffer.Length; 

    for (int i = 0; i < length; i += 8) 
    { 
     if (length - i >= 8) 
     { 
      definition.buffering = BitConverter.ToInt64(buffer, i); 
      Console.Write(definition.buffering.ToString()); 
      //Int64 val = BitConverter.ToInt64(buffer, i); 
      foreach (var item in buffer) 
      { 
       SQLiteConnection sqliteCon = new SQLiteConnection(dBConnectionString); 
       //open connection to database 
       try 
       { 
        string itemcode = item.ToString(); 
        sqliteCon.Open(); 
        string Query = "insert into EmployeeList (empID,Name,surname,Age) values('" + itemcode + "','" + itemcode + "','" + itemcode + "','" + itemcode + "')"; 
        SQLiteCommand createCommand = new SQLiteCommand(Query, sqliteCon); 
        createCommand.ExecuteNonQuery(); 
        MessageBox.Show("Saved"); 
        sqliteCon.Close(); 
       } 
       catch (Exception ex) 
       { 
        MessageBox.Show(ex.Message); 
       } 
       Console.Write(item.ToString()); 
      } 
     } 
     else 
     { 
      // invalid (last) part. 
     } 
    } 
    //definition.buffering = BitConverter.ToInt64(buffer, 0); 


    Console.WriteLine(); 
    Console.WriteLine(definition.buffering); 
    Console.WriteLine(); 
    Thread thread = new Thread(new ThreadStart(() => ThreadExample.ThreadJob(this))); 
    thread.Start(); 
    thread.Join(); 


} 
#endregion 

编辑一个。我试着发送0xFF，但是这个代码在控制台中的显示是0。

嗨。我有这样的代码并执行后，我有一个问题，关于这一点：

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll 

Additional information: Destination array is not long enough to copy all the items in the collection. Check array index and length. 

，它是在这条线一点：

definition.buffering = BitConverter.ToInt64(buffer, 0); 

我该如何解决这个问题？

Answer 1

我觉得你的缓冲区的长度不是（至少）8

MSDN说：

Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.

你得到了ArgumentException时：

startIndex is greater than or equal to the length of value minus 7, and is less than or equal to the length of value minus 1.

调用BitConverter.ToInt64方法，你之前应该检查

serial.BytesToRead.Length >= 8 

要经过的所有字节试试这个：

int length = buffer.Length; 

for (int i = 0; i < length; i += 8) 
{ 
    if (length - i >= 8) 
    { 
     Int64 val = BitConverter.ToInt64(buffer, i); 
    } 
    else 
    { 
     // invalid (last) part. 
    } 
}