[英]How to serve a file from an ASP.NET Controller?
我想使用c#asp.net做到这一点,您能告诉我处理这部分所需的实际方法吗:{从文件系统获取文件}?
ActionResult FunctionToServeFile(fileName, guid)
{
File result;
var itemEntry = db.items.firstOrDefault(x => x.guid == guid);
var itemPermissionsEntry = itemEntry.userPermissions
.firstOrDefault(x => x.user == user.identity.name);
if(itemPermissionsEntry.view == true || itemPermissionsEntry.Modify == true)
{
result = {get file from filesystem}
return result;
}
else
{
return error;
}
}
您必须将文件放置在服务器中的某个位置,因此只需创建一个获取该路径并通过控制器将其提供服务的方法,如下所示:
string thefile = SomeModelClass.SomeMethod(fileName, guid); // get full path to the file
var cd = new System.Net.Mime.ContentDisposition
{
FileName = Path.GetFileName(thefile),
Inline = false
};
Response.AppendHeader("Content-Disposition", cd.ToString());
string fileext = Path.GetExtension(thefile);
string mimeType = SomeMetodToMapextensionToMimeType(fileext); // You have to implement this by yourself
return File(System.IO.File.ReadAllBytes(thefile), mime);
这是我到达的解决方案:
public ActionResult DownloadFile(string fileName, Guid guid)
{
Item item = db.Items.FirstOrDefault(x => x.ItemGUID == guid);
if (item == null)
return null;
List <SecurityMask> accessList = GetAccessRightsForItem(item.item_id,
ActiveDirectory.GetUserSID(User.Identity.Name));
bool hasAccess = false || (accessList.Contains(SecurityMask.View) || accessList.Contains(SecurityMask.Modify));
string filePath = Path.GetFullPath(Path.Combine(HttpRuntime.AppDomainAppPath,
"Files\\Items", guid.ToString(), fileName));
string mimeType = MimeMapping.GetMimeMapping(filePath);
bool fileExists = System.IO.File.Exists(filePath);
if (hasAccess && fileExists)
{
return File(System.IO.File.ReadAllBytes(filePath), mimeType);
}
return null;
}
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