public async Task <IFile> CopyFromAsync(IFile file, string targetPath)
{
Guard.ArgumentNotNull(file, nameof(file));
if (!file.Exists)
{
throw new ArgumentException("要从中复制内容的源文件不存在。", nameof(file));
}
Guard.ArgumentIsRelativePath(targetPath, nameof(targetPath));
string fullPath = _fileMapping.GetFilePath(targetPath, _scope);
using (var fs = await file.CreateReadStreamAsync())
{
return(await CreateFileAsync(fullPath, fs));
}
}