MVC ViewBag和ViewData的使用

ViewBag

 public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";
            List<string> colors = new List<string>();
            colors.Add("Red");
            colors.Add("blue");

            ViewBag.Listcolors = colors;
            return View();
        }

View

@{
    ViewBag.Title = "About";
}
<h2>@ViewBag.Title.</h2>
<h3>@ViewBag.Message</h3>

<p>Use this area to provide additional information.</p>
<ul>
    @foreach (var color in ViewBag.ListColors)
    {
        <li>@color</li>
    }
</ul>

效果图

ViewData

 public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";
            List<string> colors = new List<string>();
            colors.Add("Red");
            colors.Add("blue");

            ViewData["ListColors"] = colors;
            ViewData["DatetimeNow"] = DateTime.Now;
            return View();
        }

View

@{
    ViewBag.Title = "About";
}
<h2>@ViewBag.Title.</h2>
<h3>@ViewBag.Message</h3>

<p>Use this area to provide additional information.</p>
<ul>
    @foreach (var color in ViewData["listColors"] as List<string>)
    {
        <li>@color</li>
    }
</ul>
<p>@ViewData["DatetimeNow"]</p>

效果图

ViewData与ViewBag的区别

1、ViewData是字典类型，赋值方式用字典方式，通过key值读取对应的value，ViewData[“myName”]

2、ViewBag是动态类型，使用时直接添加属性赋值即可ViewBag.myName

3、ViewBag和ViewData只在当前Action中有效，等同于View

4、ViewData和ViewBag中的值可以互相访问，因为ViewBag的实现中包含了ViewData