C# DataWriter.WriteBoolean方法代碼示例

 private async void OnWrite(Object sender, RoutedEventArgs e)
 {
     // 獲取本地目錄的引用
     StorageFolder local = ApplicationData.Current.LocalFolder;
     // 創建新文件
     StorageFile newFIle = await local.CreateFileAsync("demo.dat", CreationCollisionOption.ReplaceExisting);
     // 打開文件流
     using(IRandomAccessStream stream = await newFIle.OpenAsync(FileAccessMode.ReadWrite))
     {
         // 實例化 DataWriter
         DataWriter dw = new DataWriter(stream);
         // 設置默認編碼格式
         dw.UnicodeEncoding = UnicodeEncoding.Utf8;
         // 寫入 bool 值
         dw.WriteBoolean(true);
         // 寫入日期值
         DateTime dt = new DateTime(2010, 8, 21);
         dw.WriteDateTime(dt);
         // 寫入字符串
         string str = "測試文本";
         // 計算字符串長度
         uint len = dw.MeasureString(str);
         // 先寫入字符串的長的
         dw.WriteUInt32(len);
         // 再寫入字符串
         dw.WriteString(str);
         // 以下方法必須調用
         await dw.StoreAsync();
         // 解除 DataWriter 與流的關聯
         dw.DetachStream();
         dw.Dispose();
     }
     MessageDialog msgDlg = new MessageDialog("保存成功。");
     await msgDlg.ShowAsync();
 }

        /// <summary>
        /// Saves the current progress state for the current dictionary
        /// </summary>
        public void saveState()
        {
            if (string.IsNullOrEmpty(mCrammerDict.StateFile))
                throw new Exception("No state file available");

            try
            {
                using (InMemoryRandomAccessStream memoryStream = new InMemoryRandomAccessStream())
                {
                    using (DataWriter dataWriter = new DataWriter(memoryStream))
                    {
                        dataWriter.WriteInt32(mTotalWords);
                        dataWriter.WriteInt32(mKnownWords);
                        dataWriter.WriteInt32(mStart);
                        dataWriter.WriteInt32(mCurrentWord);
                        dataWriter.WriteBoolean(mNewWordsInUse);
                        dataWriter.WriteInt32(mInSystem);
                        dataWriter.WriteBoolean(mSwapSequence);
                        dataWriter.WriteBoolean(mReachedEnd);

                        mNewWordsChamber.saveState(dataWriter);
                        mFirstChamber.saveState(dataWriter);
                        mSecondChamber.saveState(dataWriter);
                        mThirdChamber.saveState(dataWriter);
                        mFourthChamber.saveState(dataWriter);
                        mFifthChamber.saveState(dataWriter);
                        mCompletedChamber.saveState(dataWriter);

                        IBuffer stateBuffer = dataWriter.DetachBuffer();
                        string stateString = BinaryBufferConverter.getStringFromBuffer(stateBuffer);

                        mCrammerDict.setStateFile(stateString);
                    }
                }
            }
            catch (Exception)
            {
                // Assume mismatch with chamber-size config and contents of .STA file.
                // Delete it so that the dictionary will load successfully next time.
                mCrammerDict.removeStateFile();
            }

            mRestoredState = true;
        }

        private async Task WriteStatus(bool state)
        {
            StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
            StorageFile file = await storageFolder.CreateFileAsync("status.txt", CreationCollisionOption.ReplaceExisting);
            var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);

            using (var outputStream = stream.GetOutputStreamAt(0))
            {
                using (var dataWriter = new DataWriter(outputStream))
                {
                    dataWriter.WriteBoolean(state);
                    await dataWriter.StoreAsync();
                    await outputStream.FlushAsync();
                }
            }
            stream.Dispose();
        }