c# dotnetspeech

我下了simple Chinese 包
选择一段新闻念的时候总是没念完就停了，但是生成的.wav是完整的
//念中文代码
string read=(string)obj.GetData(DataFormats.Text);
                SpeechVoiceSpeakFlags SpFlags = SpeechVoiceSpeakFlags.SVSFlagsAsync;
                SpVoice Voice = new SpVoice();
                Voice.Speak(read, SpFlags);
//生成.wav
DotNetSpeech.SpeechVoiceSpeakFlags SSF = DotNetSpeech.SpeechVoiceSpeakFlags.SVSFlagsAsync;
                DotNetSpeech.SpVoice vo = new SpVoiceClass();
                System.Windows.Forms.SaveFileDialog SFD = new System.Windows.Forms.SaveFileDialog();
                SFD.Filter = "All files (*.*)|*.*|wav files (*.wav)|*.wav";
                SFD.Title = "Save to a wav file";
                SFD.FilterIndex = 2;
                SFD.RestoreDirectory = true;
                if (SFD.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    DotNetSpeech.SpeechStreamFileMode SSFM = DotNetSpeech.SpeechStreamFileMode.SSFMCreateForWrite;
                    DotNetSpeech.SpFileStream SFS = new DotNetSpeech.SpFileStreamClass();
                    SFS.Open(SFD.FileName, SSFM, false);
                    vo.AudioOutputStream = SFS;
                    vo.Speak((string)obj.GetData(DataFormats.Text), SSF);
                    vo.WaitUntilDone(System.Threading.Timeout.Infinite);
                    SFS.Close();
                }