/// <summary>
/// 获取文件或目录最后的写入UTC时间。
/// </summary>
/// <param name="virtualPathProvider">虚拟路径提供者。</param>
/// <param name="virtualPath">虚拟路径。</param>
/// <returns>UTC时间。</returns>
public static DateTime?GetLastWriteTimeUtc(this IVirtualPathProviderBase virtualPathProvider, string virtualPath)
{
virtualPathProvider.NotNull("virtualPathProvider");
virtualPath.NotEmptyOrWhiteSpace("virtualPath");
var dateTime = virtualPathProvider.GetFileLastWriteTimeUtc(virtualPath);
return(dateTime.HasValue ? dateTime : virtualPathProvider.GetDirectoryLastWriteTimeUtc(virtualPath));
}
/// <summary>
/// 在指定虚拟路径创建一个文件并创建一个写入流。
/// </summary>
/// <typeparam name="T">返回值类型。</typeparam>
/// <param name="virtualPathProvider">虚拟路径提供者。</param>
/// <param name="virtualPath">虚拟路径。</param>
/// <param name="func">对写入流的操作。</param>
/// <returns>新文件的写入流。</returns>
public static T CreateTextFunc <T>(this IVirtualPathProviderBase virtualPathProvider, string virtualPath, Func <StreamWriter, T> func)
{
virtualPathProvider.NotNull("virtualPathProvider");
virtualPath.NotEmptyOrWhiteSpace("virtualPath");
func.NotNull("func");
var result = default(T);
virtualPathProvider.CreateText(virtualPath, stream => result = func(stream));
return(result);
}
/// <summary>
/// 打开一个文件。
/// </summary>
/// <typeparam name="T">返回值类型。</typeparam>
/// <param name="virtualPathProvider">虚拟路径提供者。</param>
/// <param name="virtualPath">虚拟路径。</param>
/// <param name="func">对流的操作。</param>
/// <returns>文件流。</returns>
public static T OpenFileFunc <T>(this IVirtualPathProviderBase virtualPathProvider, string virtualPath, Func <Stream, T> func)
{
virtualPathProvider.NotNull("virtualPathProvider");
virtualPath.NotEmptyOrWhiteSpace("virtualPath");
func.NotNull("func");
var result = default(T);
virtualPathProvider.OpenFile(virtualPath, stream =>
{
result = func(stream);
});
return(result);
}