public ActionResult Create(MenuModel menu)
{
if (ModelState.IsValid)
{
//新建菜单的创建日期和修改日期为当前日期
menu.CreateDate = DevTools.GetNowDateTime();
menu.ModifyDate = menu.CreateDate;
db.Menus.Add(menu);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(menu);
}
//根据id及parentid保存path，便于数据的检索
private bool savePath(MenuModel menu)
{
try
{
if (menu.ParentId == 0)
{
menu.Path = "0," + menu.MenuId + ",";
}
else
{
MenuModel parentData = db.Menus.Single(d => d.MenuId == menu.ParentId);
menu.Path = parentData.Path + menu.MenuId + ",";
}
db.Entry(menu).State = EntityState.Modified;
db.SaveChanges();
}
catch (Exception ex)
{
ModelState.AddModelError("", ex.Message);
return false;
}
return true;
}
//获取parentId字段的下拉选择集合
private List<SelectListItem> getParentSelectList(MenuModel menu)
{
int depth = 1;
var AllList = new List<SelectListItem>();
AllList.Add(new SelectListItem { Text = "/", Value = "0" });//添加根parentId
if (menu == null)
{
menu = new MenuModel { ParentId = 0 };
}
int selectedParentId = menu.ParentId;//传入的记录的上级菜单id，用于设定selectList的默认选中项
GetChildrenList(menu, AllList, depth, selectedParentId);
return AllList;
}
private List<MenuModel> GetChildrenList(MenuModel menu, List<SelectListItem>AllList, int depth, int selectedParentId)
{
var list = db.Menus.Where(o => o.ParentId == menu.MenuId).OrderBy(o=>o.MenuId).OrderByDescending(o=>o.SortId);
if(depth == 1)//如果是第一层，那应该取parentId为0的
list = db.Menus.Where(p => p.ParentId == 0).OrderBy(o=>o.MenuId).OrderByDescending(o=>o.SortId);
if (list.Count() == 0)
return null;
++depth;
string s2 = "";
for (int j = 1; j < depth; j++)
{
s2 += "＿";//分隔符
}
foreach (var child in list)
{
if (selectedParentId == child.MenuId)//如果此菜单是传入菜单的父级
AllList.Add(new SelectListItem { Text = s2 + child.MenuName, Value = child.MenuId.ToString(),Selected = true });//添加下级的ParentId
else
AllList.Add(new SelectListItem { Text = s2 + child.MenuName, Value = child.MenuId.ToString() });//添加下级的ParentId
GetChildrenList(child, AllList, depth, selectedParentId);
}
return list.ToList();
}
private List<MenuModel> GetAllChildrenList(MenuModel menu, ref List<MenuModel>SortList, int depth)
{
if (menu == null)//第一次调用时取第一级，所以parentId = 0
{
menu = new MenuModel { ParentId = 0};
}
var list = db.Menus.Where(p => p.ParentId == menu.MenuId).OrderBy(o => o.MenuId).OrderByDescending(o => o.SortId);
if(depth == 1)
list = db.Menus.Where(p => p.ParentId == menu.ParentId).OrderBy(o => o.MenuId).OrderByDescending(o => o.SortId);
if (list.Count() == 0)
return SortList;
++depth;
string s2 = "";
for (int j = 2; j < depth; j++)
{
s2 += " ";//分隔符 全角空格
}
foreach (var child in list)
{
if(depth != 2)
child.MenuName = s2 + s1 + child.MenuName;
SortList.Add(child);//添加下级的ParentId
GetAllChildrenList(child, ref SortList, depth);
}
return SortList;
}
public ActionResult Edit(MenuModel menu)
{
if (ModelState.IsValid)
{
//修改日期为当前日期
menu.ModifyDate = DevTools.GetNowDateTime();
db.Entry(menu).State = EntityState.Modified;
db.SaveChanges();
if (!savePath(menu))//保存path字段，路径如 0,1,2
{
return View(menu);
}
return RedirectToAction("Index");
}
ViewBag.ParentId = getParentSelectList(menu);
//暂时不做缓存 OutputCacheAttribute.ChildActionCache = new MemoryCache("MyMenus");
return View(menu);
}
