ViewData, ViewBag, TempData, and viewdataviewbag in MVC

ViewData, ViewBag, TempData, and viewdataviewbag in MVC

Differences between ViewBag and TempData

ViewData	ViewBag
It is a collection of Key/Value dictionaries.	It is a dynamic type object.
From Asp.net MVC 1.	ASP. NET MVC3
Based on Asp.net 3.5 framework	Based on Asp.net 4.0 and. net framework
ViewData is faster than ViewBag	ViewBag is slower than ViewData
The appropriate data type needs to be converted when querying data in ViewPage.	No type conversion is required when querying data in ViewPage.
Some type conversion code	Better readability

 

Use in Controller

ViewData:

Assign values to data in Controller

Var markeType = new MarketDataProvider (). GetBTIDData (). Where (a => a. ID! = "0"); // obtain data from the database, which is list data ViewBag. DateType = markeType; // assign the value "DateType" to ViewBag. DateType and you can write the name as needed.

* Frontend call

@ Foreach (var modelMarket in ViewData ["Markettype"] as Dictionary <string, string>) {<div class = "row"> string str = "trademark, copyright, transaction, international Registration "; string [] strs = str. split (','); Dictionary <string, string> dic = new Dictionary <string, string> (); for (int I = 0; I <5; I ++) {dic. add (I. toString (), strs [I]);} ViewData ["Markettype"] = dic;

　　

Foreground call:

 

@foreach (var modelMarket2 in ViewBag.DateType)                    {                        <div class="row">