win8 文件读取操作----模版操作 

 1    /// <summary>
 2        /// 数据存储
 3        /// </summary>
 4        /// <typeparam name="T"></typeparam>
 5        /// <param name="data"></param>
 6        /// <param name="fileName"></param>
 7        /// <returns></returns>
 8        public static async Task SavaData<T>(T data,string fileName)
 9        {
10            //创建文件
11              try
12            {
13            StorageFile sFile =await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName,CreationCollisionOption.ReplaceExisting);
14            //写入流
15            IRandomAccessStream stream = await sFile.OpenAsync(FileAccessMode.ReadWrite);
16            
17                  using (IOutputStream outStream = stream.GetOutputStreamAt(0))
18            {
19                //序列化数据，并写入数据
20                DataContractSerializer serializer = new DataContractSerializer(typeof(T));
21                serializer.WriteObject(outStream.AsStreamForWrite(), data);
22                await outStream.FlushAsync();//异步刷新数据
23                //outStream.Dispose();//异步刷新数据              
24            }
25                 stream.Dispose(); 
26 //要把留释放掉否则会出现对同一文件操作的权限问题
27           
28            }
29              catch (Exception error)
30              {
31                  throw new Exception(error.Message);
32              }
33        }
34 
35        /// <summary>
36        /// 读取数据
37        /// </summary>
38        /// <param name="fileName"></param>
39        /// <returns></returns>
40        public static async Task<T> ReadData<T>(string fileName)
41        {
42            T data=default(T);
43            try
44            {
45                //获取文件
46                StorageFile sFile = await ApplicationData.Current.LocalFolder.GetFileAsync(fileName);
47                if (sFile == null) return data;
48                //打开一个顺序访问流
49                IInputStream inputStream = await sFile.OpenSequentialReadAsync();
50                //反序列化
51                DataContractSerializer serializer = new DataContractSerializer(typeof(T));
52                data = (T)serializer.ReadObject(inputStream.AsStreamForRead());
53            }
54            catch (Exception error)
55            { }
56              return data;
57        }
58 
59        /// <summary>
60        /// 删除文件 
61        /// </summary>
62        /// <param name="fileName"></param>
63        /// <returns></returns>
64        public static async Task<bool> DeleteData(string fileName)
65        {
66            bool isDelete = false;
67            try
68            {
69                StorageFile sFile = await ApplicationData.Current.LocalFolder.GetFileAsync(fileName);
70                await sFile.DeleteAsync();
71                isDelete = true;
72            }
73            catch (Exception)
74            { }
75            return isDelete;
76        }
77 
78 
79        public static async Task WriteTimestamp()
80        {
81            try
82            {
83                StorageFile sampleFile = await ApplicationData.Current.LocalFolder.CreateFileAsync("dataFile.txt", CreationCollisionOption.ReplaceExisting);
84                await FileIO.WriteTextAsync(sampleFile, DateTime.Now.ToString());
85            }
86            catch (Exception e1)
87            {
88                throw new Exception(e1.Message);
89            }
90        }

文件存储操作

posted @ 2012-07-11 10:23  win_and_first  阅读(515)  评论(0)    收藏  举报