MVC中的ModelState.IsValid验证总是true
我没有使用强类型视图，ModelState.IsValid验证总是true，感觉好像没有进行Model数据验证
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/MasterPage.Master" Inherits="System.Web.Mvc.ViewPage" %><asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Login</asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h3> 用户登录</h3> <% using (Html.BeginForm()) { %> <span class="message"> <%= Html.Encode(ViewData["message"])%> </span> <div> <fieldset> <legend>登录信息</legend> <div class="editor-label"> 用户名 </div> <div class="editor-field"> <%= Html.TextBox("username")%> <%= Html.ValidationMessage("username")%> </div> <div class="editor-label"> 密码 </div> <div class="editor-field"> <%= Html.Password("password")%> <%= Html.ValidationMessage("password")%> </div> <p> <input type="submit" value="登录" /> </p> </fieldset> </div> <% } %></asp:Content>[HttpPost,ActionName("Login")] public ActionResult LoginPost(FormCollection collection) { userinfo userinfo=new userinfo(); userinfo.username = collection.GetValue("username").AttemptedValue; userinfo.password = collection.GetValue("password").AttemptedValue; if (!ModelState.IsValid) return View(); else { userinfo = dal.Login(userinfo.username, userinfo.password); if (userinfo != null) { Session.Add("username", userinfo.username); return RedirectToAction("index"); } else { ViewData["message"] = "用户名或密码错误，请重新输入！"; return View(); } } }