在程序中调用C++链接库中的回调函由于没有考虑生命周期，直接写委托回随机的被gc给回收掉导致报这个错误

错误的程序:

private void InitPlateIdentify(){   try   {         if (string.IsNullOrEmpty(sPlateIP))return;        handle = Dbvt_JpegCreateCamera(handle);        Dbvt_JpegSetCameraCallBack(handle,DBVT_JpegSave,DBVT_GetSerialData,Dbvt_SetDevicesError);        if (!Dbvt_JpegConnectDataCamera(handle, sPlateIP))                    MessageBox.Show("打开车牌识别失败");       }       catch (Exception ex)       {           MessageBox.Show("打开车牌识别失败");           Log.log("错误InitPlateIdentify:" + ex.ToString());       } }

正确的程序:

private CameraJpegCallBackFunc fMSGCallBack;private void InitPlateIdentify(){     try     {          if (string.IsNullOrEmpty(sPlateIP)) return;          this.fMSGCallBack = this.DBVT_JpegSave;          handle = Dbvt_JpegCreateCamera(handle);          Dbvt_JpegSetCameraCallBack(handle, this.fMSGCallBack, DBVT_GetSerialData, Dbvt_SetDevicesError);           if (!Dbvt_JpegConnectDataCamera(handle, sPlateIP))                    MessageBox.Show("打开车牌识别失败");       }       catch (Exception ex)       {           MessageBox.Show("打开车牌识别失败");                Log.log("错误InitPlateIdentify:" + ex.ToString());        }}