C#后台自定义规则排序

 list.Select(a => new {
    
     a.proj_cnt, a.area_name, sort = GetSort(a.area_name) }).OrderBy(a => a.sort);
        

 public int GetSort(string name)
   {
    
    
       switch (name)
       {
    
    
           case "广州市": return 1;
           case "佛山市": return 2;
           case "深圳市": return 3;
           case "东莞市": return 4;
           default: return 99;
       }
   }