private async Task downloadAndOpen(HsFile item)
{
//如果文件存在与本地，则直接打开，否则先下载再打开。
string[] cachePath = new string[] { "Cache", "Files" };
string cachefilename = $"{item.FileHash}.{item.FileName}";
IPlatformExtension pe = DependencyService.Get <IPlatformExtension>(DependencyFetchTarget.GlobalInstance);
if (!pe.FileExist(cachefilename, cachePath)) //文件不存在需要下载
{
int index = 0;
using (MemoryStream ms = new MemoryStream())
{
while (true)
{
//下载文件...
HsLabelValue result = await GetWSUtil().GetSysFileSeg(GetLoginData().ProgressId, item.FileHash, index);
if (result == null) //文件读取完毕
{
break;
}
byte[] buffer = HsBase64.FromBase64ToBytes(result.GetValueByLabel("Data"));
//数据解压缩
buffer = HsZlib.DecompressData(buffer);
ms.Write(buffer, 0, buffer.Length);
index++;
}
byte[] fileData = ms.ToArray();
Debug.WriteLine(HsMD5.EncryptionMD5(fileData));
await pe.WriteFile(cachefilename, fileData, 2, cachePath);
}
await downloadAndOpen(item);
}
else
{
List <string> previewFiletypes = new List <string>()
{
"DOC", "DOCX",
"XLS", "XLSX",
"PPT", "PPTX",
"PDF",
"TXT", "TEXT",
"JPG", "PNG"
};
if (previewFiletypes.Contains(item.FileType.ToUpper()))
{
string url = pe.GetFileURL(cachefilename, cachePath);
if (!string.IsNullOrWhiteSpace(url))
{
Panel_PreviewFile panel = new Panel_PreviewFile();
panel.Source = new UrlWebViewSource()
{
Url = url
};
await Navigation.PushAsync(panel);
}
}
else
{
pe.CallFile(cachefilename, cachePath);
}
}
}