Question

我有以下实体框架代码片段，其中包含“Groups”表和子“ApplicationsGroupsLK”表，其中包含我需要的ApplicationID字段。

IEnumerable<Groups> Groups = DbContext.Groups.Include("ApplicationsGroupsLK").Where(p => p.GroupNumber > 0);

子数据显然在一个集合中回来了。

我基本上需要显示父数据和子ApplicationID字段（许多应用程序为1组）。

在我的MVC视图中，我的ViewModel应该包含哪些内容将包含我需要的父数据和子数据，以便我可以正确地将其绑定到网格？

第二篇文章：

此外，从实体框架生成以下模型：

public partial class Project
    {
        public Project()
        {
            this.TimeTrackings = new HashSet<TimeTracking>();
        }

     [DataMember]
        public short ProjectID { get; set; }
     [DataMember]
        public short CustomerID { get; set; }
     [DataMember]
        public string Name { get; set; }
     [DataMember]
        public string Description { get; set; }
     [DataMember]
        public short CategoryID { get; set; }
     [DataMember]
        public short PriorityID { get; set; }
     [DataMember]
        public short StatusID { get; set; }
     [DataMember]
        public Nullable<decimal> Quote { get; set; }
     [DataMember]
        public string Notes { get; set; }
     [DataMember]
        public System.DateTime CreatedDate { get; set; }
     [DataMember]
        public Nullable<System.DateTime> UpdatedDate { get; set; }

     [DataMember]
        public virtual Category Category { get; set; }
     [DataMember]
        public virtual Customer Customer { get; set; }
     [DataMember]
        public virtual Priority Priority { get; set; }
     [DataMember]
        public virtual Status Status { get; set; }
     [DataMember]
        public virtual ICollection<TimeTracking> TimeTrackings { get; set; }
    }

您可以看到TimeTrackings是Project的子表。您还可以看到CategoryID，CustomerID，PriorityID和StatusID是父表具有的外键。在这种情况下，我只对CategoryID FK感兴趣。

我还没有这样做（不是在我家里的机器上），但是当我将数据输入到这个模型中时，实际包含在公共虚拟类别类别字段中的内容？由于它不是集合，因此在查询执行后会在此字段中返回什么数据。

第三篇文章： Telerik asp.net用于DB调用的mvc语法：

IEnumerable<Groups> GroupList = db.GetGroups();

            return View(new GridModel<Groups>
            {
                Data = GroupList
            });

第四篇文章： Trey，下面是我为我的目的修改的代码，并希望你可以在我实现它之前检查它。我想我不知道它，看起来很棒......

public partial class Project
    {
        public Project()
        {
            this.TimeTrackings = new HashSet<TimeTracking>();
        }

     [DataMember]
        public short ProjectID { get; set; }
     [DataMember]
        public short CustomerID { get; set; }
     [DataMember]
        public string Name { get; set; }
     [DataMember]
        public string Description { get; set; }
     [DataMember]
        public short CategoryID { get; set; }
     [DataMember]
        public short PriorityID { get; set; }
     [DataMember]
        public short StatusID { get; set; }
     [DataMember]
        public Nullable<decimal> Quote { get; set; }
     [DataMember]
        public string Notes { get; set; }
     [DataMember]
        public System.DateTime CreatedDate { get; set; }
     [DataMember]
        public Nullable<System.DateTime> UpdatedDate { get; set; }
     [DataMember]
        public short ApplicationID { get; set; }
     [DataMember]
        public string ApplicationName { get; set; }
     [DataMember]
        public virtual Category Category { get; set; }
     [DataMember]
        public virtual Customer Customer { get; set; }
     [DataMember]
        public virtual Priority Priority { get; set; }
     [DataMember]
        public virtual Status Status { get; set; }
     [DataMember]
        public virtual ICollection<TimeTracking> TimeTrackings { get; set; }


     public ProjectModel(Project project)
     {
        ProjectID = project.ProjectID;
        CustomerID = project.CustomerID;
        Name = project.Name;
        Description = project.Description;
    CategoryID = project.CategoryID;
        PriorityID = project.PriorityID;
        StatusID = project.StatusID;
        Quote = project.Quote;
        Notes = project.Notes;
        CreatedDate = project.CreatedDate;
        UpdatedDate = project.UpdatedDate;
        ApplicationID = project.ApplicationsGroupsLK.ApplicationID;
        ApplicationName = project.ApplicationsGroupsLK.ApplicationName;
     }


     // Neat Linq trick to convert database query results directly to Model
     public static IList<ProjectModel> FlattenToThis(IList<Project> projects)
     {
        return projects.Select(project => new ProjectModel(project)).ToList();
     }

    }

第五篇文章：

using (wmswebEntities DbContext = new wmswebEntities())
                {
                    DbContext.Configuration.ProxyCreationEnabled = false;
                    DbContext.Database.Connection.Open();

                    IEnumerable<Projects> projects = DbContext.Projects.Where(p => p.GroupNumber > 0);

                    IList<ProjectModel> results = Project.FlattenToThis(projects);

                    return results

}

第六个帖子命名空间CMSEFModel { 使用系统; 使用System.Collections.Generic;

public partial class GroupModel
{
    public GroupModel()
    {
        this.ApplicationsGroupsLKs = new HashSet<ApplicationsGroupsLK>();
        this.GroupApplicationConfigurationsLKs = new HashSet<GroupApplicationConfigurationsLK>();
        this.UsersGroupsLKs = new HashSet<UsersGroupsLK>();
    }

    public int GroupNumber { get; set; }
    public string GroupName { get; set; }
    public int GroupRank { get; set; }
    public bool ActiveFlag { get; set; }
    public System.DateTime DateAdded { get; set; }
    public string AddedBy { get; set; }
    public System.DateTime LastUpdated { get; set; }
    public string LastUpdatedBy { get; set; }
    // Application - Lazy Loading population
    public int ApplicationID { get; set; }
    // UsersGroupsLK - Lazy Loading population
    public int UserNumber { get; set; }
    public string UserID { get; set; }

    public virtual ICollection<ApplicationsGroupsLK> ApplicationsGroupsLKs { get; set; }
    public virtual ICollection<GroupApplicationConfigurationsLK> GroupApplicationConfigurationsLKs { get; set; }
    public virtual ICollection<UsersGroupsLK> UsersGroupsLKs { get; set; }

    public GroupModel()
    {}
    public GroupModel(GroupModel group)
     {
        GroupNumber = group.GroupNumber;
        GroupName = group.GroupName;
        ActiveFlag = group.ActiveFlag;
        DateAdded = group.DateAdded;
        AddedBy = group.AddedBy;
        LastUpdated = group.LastUpdated;
        LastUpdatedBy = group.LastUpdatedBy;
        UserNumber = group.UsersGroupsLKs.
     }


 // Neat Linq trick to convert database query results directly to Model
 public static IList<GroupModel> FlattenToThis(IList<GroupModel> groups)
 {
    return groups.Select(group => new GroupModel(group)).ToList();
 }
}

}

Seventh Post - 这是我之前发布的错误的模型。特雷，如果你能提供帮助，我真的会感激他......我“死在水中”，除非我能让这部分工作。

namespace CMSEFModel
{
    using System;
    using System.Collections.Generic;

    public partial class Group
    {
        public Group()
        {
            this.ApplicationsGroupsLKs = new HashSet<ApplicationsGroupsLK>();
            this.GroupApplicationConfigurationsLKs = new HashSet<GroupApplicationConfigurationsLK>();
            this.UsersGroupsLKs = new HashSet<UsersGroupsLK>();
        }

        public int GroupNumber { get; set; }
        public string GroupName { get; set; }
        public int GroupRank { get; set; }
        public bool ActiveFlag { get; set; }
        public System.DateTime DateAdded { get; set; }
        public string AddedBy { get; set; }
        public System.DateTime LastUpdated { get; set; }
        public string LastUpdatedBy { get; set; }
        // Application - Lazy Loading population
        public int ApplicationID { get; set; }
        // UsersGroupsLK - Lazy Loading population
        public int UserNumber { get; set; }
        public string UserID { get; set; }

        public virtual ICollection<ApplicationsGroupsLK> ApplicationsGroupsLKs { get; set; }
        public virtual ICollection<GroupApplicationConfigurationsLK> GroupApplicationConfigurationsLKs { get; set; }
        public virtual ICollection<UsersGroupsLK> UsersGroupsLKs { get; set; }

        public GroupModel(Group group)
         {
            GroupNumber = group.GroupNumber;
            GroupName = group.GroupName;
            ActiveFlag = group.ActiveFlag;
            DateAdded = group.DateAdded;
            AddedBy = group.AddedBy;
            LastUpdated = group.LastUpdated;
            LastUpdatedBy = group.LastUpdatedBy;
            UserNumber = group.UsersGroupsLKs.
         }

     // Neat Linq trick to convert database query results directly to Model
     public static IList<GroupModel> FlattenToThis(IList<Group> groups)
     {
        return groups.Select(group => new GroupModel(group)).ToList();
     }
    }

}

八个帖子：

using (wmswebEntities DbContext = new wmswebEntities())
                {
                    DbContext.Configuration.ProxyCreationEnabled = false;
            DbContext.Configuration.LazyLoadingEnabled = true;
                    DbContext.Database.Connection.Open();

                    List<Groups> myGroups = new List<Groups>();

                     var myGroups = from p in DbContext.Groups
                                where p.ActiveFlag = true
                                select new
                                {
                                    p.Groups.ApplicationName,
                                    p.Groups.GroupName,
                                    p.Groups.GroupRank,
                                    p.Groups.ActiveFlag,
                                    p.Groups.DateAdded,
                                    p.Groups.AddedBy,
                                    p.Groups.LastUpdated,
                                    p.Groups.LastUpdatedBy,
                                    p.Groups.ApplicationsGroupsLK.ApplicationID,
                                    p.Groups.UsersGroupsLK.UserNumber
                                };

                    return myGroups;
                }

Answer 1

这需要稍微调整思考。 Grid只接受平面模型。经常会问这类问题，这是一个初答：Kendo UI Grid - How to Bind to Child Properties

如果这没有帮助，请在此处发布更多代码，我可以与您一起完成。

访问ViewModel中的数据

在我的MVC视图中，我的ViewModel应该包含哪些内容将包含我需要的父数据和子数据，以便我可以正确地将其绑定到网格？

我还没有这样做（不是在我家里的机器上），但是当我将数据输入到这个模型中时，实际包含在公共虚拟类别类别字段中的内容？由于它不是集合，因此在查询执行后会在此字段中返回什么数据。

}

}

}

1 个答案: