如何将基于 ID 的项目添加到列表并绑定到 Asp.net MVC 中的下拉列表答案

【问题标题】：How to add Item based on ID to List and Bind to dropdownlist in Asp.net MVC如何将基于 ID 的项目添加到列表并绑定到 Asp.net MVC 中的下拉列表
【发布时间】：2014-06-20 12:49:21
【问题描述】：

我有一个使用 Linq 根据客户 ID 获取项目名称和 ID 的方法

    public SelectList GetClientProjects(int clientId){

     IEnumerable<SelectListItem> clientProjectsList = 
        (from client in res.CLIENT
         join clientProj in res.CLIENT_PROJECT
         on client.ID equals clientProj.CLIENT_ID
         join project in res.PROJECT
         on clientProj.PROJ_ID equals project.ID
         where client.IS_DELETED == "N" && clientProj.IS_DELETED
                   == "N" && project.IS_DELETED 
                   == "N" && client.ID == clientId
         select project).AsEnumerable().Select(projs => new SelectListItem() {
                                  Text=projs.NAME, Value=projs.ID.ToString() });
        return new SelectList(clientProjectsList, "Value", "Text", PROJ_ID);
    }

现在，我通过以下查询获取客户 ID

var clientDetails = reslandentity.CLIENT.
Where(m => m.SUBSCRIBER_ID == userid).ToList();

由此，如何获取项目名称和项目 ID，以及如何使用 ProjectId 和填充项目名称绑定到下拉列表。

【问题讨论】：

标签： c# asp.net-mvc linq list

【解决方案1】：

 var clientDetails = reslandentity.CLIENT.Where(m => m.SUBSCRIBER_ID == userid);
 List<SelectListItem> items = new List<SelectListItem>();
 foreach (var item in clientDetails)
 {
    var clientProjectsList =
          (from client in reslandentity.CLIENT
           join clientProj in reslandentity.CLIENT_PROJECT
           on client.ID equals clientProj.CLIENT_ID
           join project in reslandentity.PROJECT
           on clientProj.PROJ_ID equals project.ID
           where client.IS_DELETED == "N" && clientProj.IS_DELETED
                     == "N" && project.IS_DELETED
                     == "N" && client.ID == item.ID
           select project).FirstOrDefault();
            if (clientProjectsList != null)
            {
                items.Add(new SelectListItem() { Text = clientProjectsList.NAME, Value = clientProjectsList.ID.ToString() });
            }
 }
 SelectList list=new SelectList(items,"Value","Text",model.PROJ_ID);
 ViewBag.ProjectsList = list;

绑定到下拉列表，如

@Html.Dropdownlistfor(m=>m.Proj_Id,(SelectList)ViewBag.ProjectsList)

希望你得到预期的结果。

【讨论】：