1.通过查看日志，可以看出问题的原因。
2.断点调试。
3.本地测试，确保无误后，线上测试。
4.输出测试。
通过get的方式，测试接口。
// [HttpPost]public ActionResult SearchGroup(string appType, string keyWord, string userName){ GroupListModel model = new GroupListModel(); // 新建model对象 var groups = _groupService.SearchGroup(appType, keyWord); foreach (var item in groups) { model.Group.Add(new GroupModel() { GroupId = item.Id, Title = item.Title, Avatar = item.Avatar, OwnerId = item.OwnerId, IsDismiss = item.IsDismiss }); } // return Json(new { result = true, info = model }); return Json(new { result = true, info = model }, JsonRequestBehavior.AllowGet);} 通过post的方式，测试接口。
[HttpPost]public ActionResult SearchGroup(string appType, string keyWord, string userName){ GroupListModel model = new GroupListModel(); // 新建model对象 var groups = _groupService.SearchGroup(appType, keyWord); foreach (var item in groups) { model.Group.Add(new GroupModel() { GroupId = item.Id, Title = item.Title, Avatar = item.Avatar, OwnerId = item.OwnerId, IsDismiss = item.IsDismiss }); } return Json(new { result = true, info = model });} 有时候编辑器不报错，不一定就是完全正确的。
下面是接口的终端代码
[HttpPost]public ActionResult SearchGroup(string appType, string keyWord, string userName){ GroupListModel model = new GroupListModel(); // 新建model对象 var groups = _groupService.SearchGroup(appType, keyWord); foreach (var item in groups) { model.Group.Add(new GroupModel() { GroupId = item.Id, Title = item.Title, Avatar = item.Avatar, OwnerId = item.OwnerId, IsDismiss = item.IsDismiss }); } return Json(new { result = true, info = model });} 目标是获取群组数据，
首先创建一个GroupListModel。它的Group属性，对应GroupModel。GroupModel中有相应的所需的属性值。using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace Ddd.Web.Models.Customer{ public partial class GroupListModel { public GroupListModel() { this.Group = new List (); } public List Group { get; set; } } public partial class GroupModel { public int GroupId { get; set; } public string Title { get; set; } public string Avatar { get; set; } public bool IsFriend { get; set; } public int OwnerId { get; set; } public bool IsDismiss { get; set; } }} 然后根据_groupService的SearchGroup方法查询数据，这里主要是一些与数据库交互的方法。各种增删改查都在这里进行。
using System;using System.Collections.Generic;using System.Linq;using Ddd.Core.Caching;using Ddd.Core.Data;using Ddd.Core.Domain.Customers;using Ddd.Services.Events;using Ddd.Core;namespace Ddd.Services.Customers{ /// /// Group service /// public partial class GroupService : IGroupService { #region Constants /// /// Key for caching /// private const string GROUPS_ALL_KEY = "YY.group.all"; /// /// Key for caching /// /// /// {0} : group ID /// private const string GROUP_BY_ID_KEY = "YY.group.id-{0}"; private const string GROUP_BY_APPTYPE_GROUPNAME_KEY = "YY.group.type-{0}.name-{1}"; /// /// Key pattern to clear cache /// private const string GROUPS_PATTERN_KEY = "YY.group."; #endregion #region Fields private readonly IRepository _groupRepository; private readonly IEventPublisher _eventPublisher; private readonly ICacheManager _cacheManager; #endregion #region Ctor /// /// Ctor /// /// Cache manager /// Group repository /// Event published public GroupService(ICacheManager cacheManager, IRepository groupRepository, IEventPublisher eventPublisher) { this._cacheManager = cacheManager; this._groupRepository = groupRepository; this._eventPublisher = eventPublisher; } #endregion #region Methods /// /// Gets all Groups /// /// Groups public virtual IList GetAllGroups() { string key = GROUPS_ALL_KEY; return _cacheManager.Get(key, () => { var query = from a in _groupRepository.Table orderby a.Id select a; return query.ToList(); }); } /// /// Gets a Group /// /// Group identifier /// Group public virtual Group GetGroupById(int groupId) { if (groupId == 0) return null; string key = string.Format(GROUP_BY_ID_KEY, groupId); return _cacheManager.Get(key, () => _groupRepository.GetById(groupId)); } /// /// Inserts a Group /// /// Group public virtual Group InsertGroup(Group group) { if (group == null) throw new ArgumentNullException("group"); _groupRepository.Insert(group); _cacheManager.RemoveByPattern(GROUPS_PATTERN_KEY); //event notification _eventPublisher.EntityInserted(group); return group; } /// /// Updates the Group /// /// Group public virtual void UpdateGroup(Group group) { if (group == null) throw new ArgumentNullException("group"); _groupRepository.Update(group); _cacheManager.RemoveByPattern(GROUPS_PATTERN_KEY); //event notification _eventPublisher.EntityUpdated(group); } /// /// Deletes a Group /// /// Group public virtual void DeleteGroup(Group group) { if (group == null) throw new ArgumentNullException("group"); _groupRepository.Delete(group); _cacheManager.RemoveByPattern(GROUPS_PATTERN_KEY); //event notification _eventPublisher.EntityDeleted(group); } public virtual Group GetGroupBySysnameAndGroupName(string sysName, string groupName) { if (string.IsNullOrEmpty(sysName)||string.IsNullOrEmpty(groupName)) return null; string key = string.Format(GROUP_BY_APPTYPE_GROUPNAME_KEY, sysName,groupName); return _cacheManager.Get(key, () => { var query = from g in _groupRepository.Table where g.SystemName == sysName && g.Title == groupName && !g.IsDismiss select g; return query.FirstOrDefault(); }); } /// /// 获取所有的朋友圈列表 /// /// /// /// GetAllGroups(int pageIndex = 0, int pageSize = int.MaxValue) { var query = from g in _groupRepository.Table where !g.IsDismiss orderby g.Id descending select g; return new PagedList (query, pageIndex, pageSize); } public virtual List SearchGroup(string appType, string keyWord) { var query = from x in _groupRepository.Table where x.SystemName == appType && x.Title.Contains(keyWord) && x.IsDismiss == false orderby x.Id descending select x; // 查询群名包含keyWord的数据 return query.ToList(); } #endregion }} 获取groups数据之后，将其赋值到model中去，
foreach (var item in groups){ model.Group.Add(new GroupModel() { GroupId = item.Id, Title = item.Title, Avatar = item.Avatar, OwnerId = item.OwnerId, IsDismiss = item.IsDismiss });} 最后通过Json输出，
return Json(new { result = true, info = model }); 编译好之后，将下面的dll上传发布，测试。
小结;实践出真知，你们看了也没用，自己多练练吧。