尝试在 mvc 3 中一次将两个模型传递到同一个视图时出现问题

Posted 2023-02-26

【中文标题】尝试在 mvc 3 中一次将两个模型传递到同一个视图时出现问题

【英文标题】：Having issue while trying to pass two model to the same view at a time in mvc 3

【发布时间】：2012-10-11 06:13:43

【问题描述】：

我正在尝试为我的简单博客网站创建我的个人资料类型页面。我有两个像这样的简单模型类：

public class UserInfoModel


    public string UserName  get; set; 


    public string Email  get; set; 


    public string Password  get; set; 


    public string ConfirmPassword  get; set; 






public class NewPost


    public string PostTitle  get; set; 


    public string PostStory  get; set; 

我创建了一个用户和帖子的联合模型类，可以像这样传递给视图：

public class UserPostModel

    public UserInfoModel User  get; set; 
    public NewPost Post  get; set; 

我写的检索用户和帖子信息的方法是这样的：

public int GetUserID(string _UserName)
    
        using (var context = new TourBlogEntities1())
        
            var UserID = from s in context.UserInfoes
                         where s.UserName == _UserName
                         select s.UserID;
            return UserID.Single();

        
    

    public UserInfo GetUserDetails(int _UserID)
    
        using (var context = new TourBlogEntities1())
        
            var UserDetails = (from s in context.UserInfoes
                              where s.UserID == _UserID
                              select s).Single();
            return UserDetails;
        
    

    public Post GetUserPosts(int _UserID)
    
        using (var context = new TourBlogEntities1())
        
            var entity = (from s in context.Posts
                         where s.UserID == _UserID
                         select s).Single();

            return entity;
        
    

最后我从我的控制器操作中调用我的所有方法，如下所示：

[Authorize]
   public ActionResult MyProfile()
   
       var Business = new Business();
       var UserID=Business.GetUserID(User.Identity.Name);
       var UserEntity=Business.GetUserDetails(UserID);
       var PostEntity=Business.GetUserPosts(UserID);




       var model = new UserPostModel();
       model.User.UserName = UserEntity.UserName; // problem showing here
       model.User.Email = UserEntity.Email;
       model.Post.PostTitle = PostEntity.PostTitle;
       model.Post.PostStory = PostEntity.PostStory;




       return View("MyProfile",model);
   

显示类似“对象未引用对象类型或空对象”的运行时错误。在传递单个模型时，我以非常相似的方式工作得很好。我在这里做错了什么？

【参考方案1】：

修改了你的 UserPostModel

public class UserPostModel

    public UserPostModel()
    
       User = new UserInfoModel();
       Post = new Post();   
    
    public UserInfoModel User  get; set; 
    public NewPost Post  get; set; 

注意：在设置为模型之前检查每个值，它不应为空。