/// <summary>
/// 从"独立存贮空间"取程序第一次运行的时间并解密
/// </summary>
/// <returns></returns>
public static string GetDataTime()
{
string fromDataTime;
//按用户、域、程序集获取独立存储区
IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User
| IsolatedStorageScope.Domain | IsolatedStorageScope.Assembly, null, null);
string[] myusername = isoStore.GetDirectoryNames(UIConstants.IsolatedStorageDirectoryName);
if (myusername.Length == 0) //没有文件夹
{
return(string.Empty); //域中没有他的目录
}
myusername = isoStore.GetFileNames(UIConstants.IsolatedStorage);
if (myusername.Length == 0) //没有文件
{
return(string.Empty); //域中没有他的用户名
}
else
{
using (IsolatedStorageFileStream isoStream1 = new IsolatedStorageFileStream(UIConstants.IsolatedStorage, FileMode.OpenOrCreate, isoStore))
{
using (StreamReader reader = new StreamReader(isoStream1))
{
fromDataTime = reader.ReadLine();
}
}
if (!string.IsNullOrEmpty(fromDataTime)) //解密
{
try
{
fromDataTime = EncodeHelper.DesDecrypt(fromDataTime, UIConstants.IsolatedStorageEncryptKey);
}
catch
{
}
}
return(fromDataTime);
}
}
/// <summary>
/// 加密并保存当前时间到"独立存贮空间" （以分号(;)追加保存）
/// </summary>
public static void SaveDataTime(DateTime fromDate)
{
string fromDataTime = fromDate.ToString("MM-dd-yyyy HH:mm:ss");
string oldTime = GetDataTime().Trim();
if (!string.IsNullOrEmpty(oldTime))
{
fromDataTime = oldTime + ";" + fromDataTime; //追加最后时间到左边
}
fromDataTime = EncodeHelper.DesEncrypt(fromDataTime, UIConstants.IsolatedStorageEncryptKey); //加密
#region 将fromDataTime保存在"独立存贮空间"
string username = fromDataTime;
//按用户、域、程序集获取独立存储区
IsolatedStorageFile isoStore =
IsolatedStorageFile.GetStore(
IsolatedStorageScope.User | IsolatedStorageScope.Domain | IsolatedStorageScope.Assembly, null, null);
string[] myusername = isoStore.GetDirectoryNames(UIConstants.IsolatedStorageDirectoryName);
IsolatedStorageFileStream isoStream1 = null;
if (myusername.Length == 0) //没有目录
{
//创建目录
isoStore.CreateDirectory(UIConstants.IsolatedStorageDirectoryName);
//创建文件
using (isoStream1 = new IsolatedStorageFileStream(UIConstants.IsolatedStorage, FileMode.Create, isoStore))
{
//写入文件
using (StreamWriter writer = new StreamWriter(isoStream1))
{
writer.WriteLine(fromDataTime);
}
}
}
else
{
myusername = isoStore.GetFileNames(UIConstants.IsolatedStorage);
if (myusername.Length == 0) //没有文件
{
//创建文件
using (isoStream1 = new IsolatedStorageFileStream(UIConstants.IsolatedStorage, FileMode.Create, isoStore))
{
//写入文件
using (StreamWriter writer = new StreamWriter(isoStream1))
{
writer.WriteLine(fromDataTime);
}
}
}
else
{
using (isoStream1 = new IsolatedStorageFileStream(UIConstants.IsolatedStorage, FileMode.Open, isoStore))
{
//写入文件
using (StreamWriter writer = new StreamWriter(isoStream1))
{
writer.WriteLine(fromDataTime);
}
}
}
}
#endregion
}