摘要:[ASP.NET,MVC]檔案下載，檔案顯示在本網頁，以原始資料是byte為例
ASP.NET Web Form：
檔案下載：
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.ClearHeaders();
System.Web.HttpContext.Current.Response.Buffer = false;
//常用contenttype:
//.doc:application/msword,.xls:application/vnd.ms-excel,.pdf:application/pdf,.jpg:image/jpeg
System.Web.HttpContext.Current.Response.ContentType = "application/pdf";
System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(strNewFileName));
System.Web.HttpContext.Current.Response.AppendHeader("Content-Length", bytes.Length.ToString());
System.Web.HttpContext.Current.Response.BinaryWrite(bytes);
System.Web.HttpContext.Current.Response.Flush();
System.Web.HttpContext.Current.Response.End();
檔案顯示在本網頁：
System.Web.HttpContext.Current.Response.ClearHeaders();
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.Buffer = false;
System.Web.HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf");
System.Web.HttpContext.Current.Response.AddHeader("Content-Length", bytes.Length.ToString());
System.Web.HttpContext.Current.Response.BinaryWrite(bytes);
System.Web.HttpContext.Current.Response.Flush();
System.Web.HttpContext.Current.Response.End();
ASP.NET MVC：寫法非常簡潔
檔案下載（程式碼寫在Controller裡面）：
byte[] bytes = new byte[1024000];
string contentType = "";
if (fileExtention == ".pdf")
{
contentType = "application/pdf";
}
else if (fileExtention == ".html" || fileExtention == ".htm")
{
contentType = "text/html";
}
else
{
}
return File(bytes, contentType, "myFile.pdf");
檔案顯示在目前網頁（程式碼寫在Controller裡面）：
byte[] bytes = new byte[1024000];
string contentType = "";
if (fileExtention == ".pdf")
{
contentType = "application/pdf";
}
else if (fileExtention == ".html" || fileExtention == ".htm")
{
contentType = "text/html";
}
else
{
}
return File(bytes, contentType);