添加项目文件。

XXCpzs/ViewModels/AboutViewModel.cs

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+using System;
+using System.Windows.Input;
+using Xamarin.Essentials;
+using Xamarin.Forms;
+
+namespace XXCpzs.ViewModels
+{
+    public class AboutViewModel : BaseViewModel
+    {
+        public AboutViewModel()
+        {
+            Title = "About";
+            OpenWebCommand = new Command(async () => await Browser.OpenAsync("https://xamarin.com"));
+        }
+
+        public ICommand OpenWebCommand { get; }
+    }
+}

XXCpzs/ViewModels/AddCustomerModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace XXCpzs.ViewModels
+{
+    class AddCustomerModel : BaseViewModel
+    {
+
+        public AddCustomerModel(int Uid)
+        {
+            Title = "添加新的客户";
+        }
+    }
+}

XXCpzs/ViewModels/BaseViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+using Xamarin.Forms;
+
+using XXCpzs.Models;
+using XXCpzs.Services;
+
+namespace XXCpzs.ViewModels
+{
+    public class BaseViewModel : INotifyPropertyChanged
+    {
+        public IDataStore<Item> DataStore => DependencyService.Get<IDataStore<Item>>();
+
+        bool isBusy = false;
+        public bool IsBusy
+        {
+            get { return isBusy; }
+            set { SetProperty(ref isBusy, value); }
+        }
+
+        string title = string.Empty;
+        public string Title
+        {
+            get { return title; }
+            set { SetProperty(ref title, value); }
+        }
+
+        protected bool SetProperty<T>(ref T backingStore, T value,
+            [CallerMemberName]string propertyName = "",
+            Action onChanged = null)
+        {
+            if (EqualityComparer<T>.Default.Equals(backingStore, value))
+                return false;
+
+            backingStore = value;
+            onChanged?.Invoke();
+            OnPropertyChanged(propertyName);
+            return true;
+        }
+
+        #region INotifyPropertyChanged
+        public event PropertyChangedEventHandler PropertyChanged;
+        protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
+        {
+            var changed = PropertyChanged;
+            if (changed == null)
+                return;
+
+            changed.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+        #endregion
+
+        protected void RaisePropertyChanged([CallerMemberName] string propertyName = "")
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}

XXCpzs/ViewModels/ChaXunViewModel.cs

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+namespace XXCpzs.ViewModels
+{
+    class ChaXunViewModel : BaseViewModel
+    {  
+        public ChaXunViewModel( )
+        {
+            Title = "产品查询"; 
+        }
+    }
+}

XXCpzs/ViewModels/ChuCangViewModel.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class ChuCangViewModel : BaseViewModel
+    {
+        public ObservableCollection<DepartmentItem> CangKuItems { set; get; } = new ObservableCollection<DepartmentItem>();
+        public ObservableCollection<ResultModel> Items { get; set; }
+        public ChuCangViewModel(UserInfo userInfo)
+        {
+            Title = "产品出仓登记";
+            Items = new ObservableCollection<ResultModel>();
+            Dictionary<string, string> _body = new Dictionary<string, string>{
+                { "companyId", userInfo.CompanyId.ToString()}
+            };
+
+            List<DepartmentItem> buMens = HttpHelper.RefreshData<DepartmentItem>(03, RestSharp.Method.POST, _body);
+            foreach (var item in buMens)
+            {
+                CangKuItems.Add(item);
+            }
+        }
+    }
+}

XXCpzs/ViewModels/CustomerViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace XXCpzs.ViewModels
+{
+    class CustomerViewModel : BaseViewModel
+    {
+        public CustomerViewModel()
+        {
+            Title = "我的客户列表";
+        }
+    }
+}

XXCpzs/ViewModels/DabaoViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class DabaoViewModel : BaseViewModel
+    {
+        private int Uid;
+
+        public ObservableCollection<DabaoTypes> dabaoTypes { get; set; }
+
+        public ObservableCollection<DabaoBrands> dabaoBrands { get; set; }
+
+        public ObservableCollection<ResultModel> Items { get; set; }
+
+        public DabaoViewModel(int uid)
+        {
+            this.Uid = uid;
+            Title = "产品入库";
+            dabaoTypes = new ObservableCollection<DabaoTypes>();
+            dabaoBrands = new ObservableCollection<DabaoBrands>();
+            Items = new ObservableCollection<ResultModel>();
+            Items.Add(new ResultModel { Code = 0, Data = "序列号", Msg = "提交结果" });
+
+            Dictionary<string, string> _body = new Dictionary<string, string>{
+                { "Uid", Uid.ToString() }
+            };
+
+            List<DabaoTypes> dt = HttpHelper.RefreshData<DabaoTypes>(07, RestSharp.Method.POST, _body);
+            if (dt != null)
+            {
+                foreach (var item in dt)
+                {
+                    dabaoTypes.Add(item);
+                }
+            }
+            List<DabaoBrands> buMens = HttpHelper.RefreshData<DabaoBrands>(08, RestSharp.Method.POST, _body);
+            if (buMens != null)
+            {
+
+                foreach (var item in buMens)
+                {
+                    dabaoBrands.Add(item);
+                }
+            }
+        }
+    }
+
+
+}

XXCpzs/ViewModels/FanXiuViewModel.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class FanXiuViewModel : BaseViewModel
+    {
+        public ObservableCollection<CauseItem> CauseItems { set; get; } = new ObservableCollection<CauseItem>();
+
+        public ObservableCollection<ResultModel> Items { set; get; }
+        public FanXiuViewModel(int Uid)
+        {
+            Title = "产品返修登记";
+            Items = new ObservableCollection<ResultModel> { };
+            List<CauseItem> dt = HttpHelper.RefreshData<CauseItem>(17,
+                RestSharp.Method.POST,
+                new Dictionary<string, string>{
+                { "Uid", Uid.ToString() },
+                { "Type", "2" }
+            });
+            if (dt != null)
+            {
+                foreach (var item in dt)
+                {
+                    CauseItems.Add(item);
+                }
+            }
+        }
+    }
+}

XXCpzs/ViewModels/HuanHuoViewModel.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class HuanHuoViewModel : BaseViewModel
+    {
+        public ObservableCollection<CauseItem> CauseItems { set; get; } = new ObservableCollection<CauseItem>();
+
+        public ObservableCollection<ResultModel> Items { set; get; }
+        public HuanHuoViewModel(int Uid)
+        {
+            Title = "产品换货登记";
+            Items = new ObservableCollection<ResultModel> { };
+            List<CauseItem> dt = HttpHelper.RefreshData<CauseItem>(17,
+               RestSharp.Method.POST,
+               new Dictionary<string, string>{
+                { "Uid", Uid.ToString() },
+                { "Type", "3" }
+            });
+            if (dt != null)
+            {
+                foreach (var item in dt)
+                {
+                    CauseItems.Add(item);
+                }
+            }
+        }
+    }
+
+}

XXCpzs/ViewModels/ItemDetailViewModel.cs

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+using System;
+
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    public class ItemDetailViewModel : BaseViewModel
+    {
+        public Item Item { get; set; }
+        public ItemDetailViewModel(Item item = null)
+        {
+            Title = item?.Text;
+            Item = item;
+        }
+    }
+}

XXCpzs/ViewModels/LoginViewModel.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Xamarin.Forms;
+using XXCpzs.helper;
+
+namespace XXCpzs.ViewModels
+{
+    class LoginViewModel : BaseViewModel
+    {
+
+        public INavigation Navigation { get; set; }
+
+        public ObservableCollection<DepartmentItem> BuMenItems1 { set; get; } = new ObservableCollection<DepartmentItem>();
+        public ObservableCollection<DepartmentItem> BuMenItems
+        {
+            set { BuMenItems1 = value; }
+            get { return BuMenItems1; }
+        }
+
+        public ObservableCollection<UserItem> UserItems1 { get; set; } = new ObservableCollection<UserItem>();
+        public ObservableCollection<UserItem> UserItems
+        {
+            set { UserItems1 = value; }
+            get { return UserItems1; }
+        }
+        public LoginViewModel(int companyId)
+        {
+            Dictionary<string, string> _body = new Dictionary<string, string>{
+                { "companyId", companyId.ToString()}
+            };
+            List<DepartmentItem> buMens = HttpHelper.RefreshData<DepartmentItem>(03, RestSharp.Method.POST, _body);
+            foreach (var item in buMens)
+            {
+                BuMenItems.Add(item);
+            }
+        }
+    }
+    public class UserItem
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        public int uid { get; set; }
+        /// <summary>
+        /// 
+        /// </summary>
+        public string realname { get; set; }
+    }
+
+    public class DepartmentItem
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        public int id { get; set; }
+        /// <summary>
+        /// 
+        /// </summary>
+        public string title { get; set; }
+    }
+}

XXCpzs/ViewModels/MainViewModel.cs

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+using Xamarin.Forms;
+using XXCpzs.Models;
+using XXCpzs.Views;
+
+namespace XXCpzs.ViewModels
+{
+    class MainViewModel : BaseViewModel
+    {
+        public Command LoadItemsCommand { get; set; }
+        public AuthorizeItem Authorize { get; set; } 
+        string company = string.Empty;
+        public string CompanyName
+        {
+            set
+            {
+                if (company != value)
+                {
+                    company = value;
+                    RaisePropertyChanged();
+                }
+            }
+            get { return company; }
+
+            //set { SetProperty(ref company, value); }
+        }
+        string department = string.Empty;
+        public string Department
+        {
+            get { return department; }
+
+            set
+            {
+                if (department != value)
+                {
+                    department = value;
+                    OnPropertyChanged(nameof(Department));
+                    //PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Department)));
+
+                    //RaisePropertyChanged();
+                }
+            }
+        }
+        string userName = string.Empty;
+        private UserInfo userInfo;
+
+        public string UserName
+        {
+            get { return userName; }
+            set
+            {
+                if (userName != value)
+                {
+                    userName = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+        public MainViewModel()
+        {
+            Title = "产品追溯";
+            
+
+        }
+    }
+}

XXCpzs/ViewModels/OrderViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    public class OrderViewModel : BaseViewModel
+    {
+        public ObservableCollection<ResultModel> Items { get; set; }
+        public OrderViewModel()
+        {
+            Title = "我的订单列表";
+            Items = new ObservableCollection<ResultModel>();
+            Items.Add(new ResultModel { Data = "序列号", Msg = "提交结果" });
+        }
+    }
+}

XXCpzs/ViewModels/RegisterViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using XXCpzs.helper;
+
+namespace XXCpzs.ViewModels
+{
+    class RegisterViewModel : BaseViewModel
+    {
+        public ObservableCollection<DepartmentItem> BuMenItems1 { set; get; } = new ObservableCollection<DepartmentItem>();
+        public ObservableCollection<DepartmentItem> BuMenItems
+        {
+            set { BuMenItems1 = value; }
+            get { return BuMenItems1; }
+        }
+        public RegisterViewModel(int companyId)
+        {
+            Title = "用户注册";
+            Dictionary<string, string> _body = new Dictionary<string, string>{
+                { "companyId", companyId.ToString() }
+            };
+            List<DepartmentItem> buMens = HttpHelper.RefreshData<DepartmentItem>(03, RestSharp.Method.POST, _body);
+            foreach (var item in buMens)
+            {
+                BuMenItems.Add(item);
+            }
+        }
+    }
+}

XXCpzs/ViewModels/ResaleViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class ResaleViewModel : BaseViewModel
+    {
+
+        public ObservableCollection<CauseItem> CauseItems { set; get; } = new ObservableCollection<CauseItem>();
+
+        public ObservableCollection<ResultModel> Items { set; get; }
+        public ResaleViewModel(int Uid)
+        {
+            Title = "产品再销申请";
+            Items = new ObservableCollection<ResultModel> { };
+            List<CauseItem> dt = HttpHelper.RefreshData<CauseItem>(17,
+                RestSharp.Method.POST,
+                new Dictionary<string, string>{
+                { "Uid", Uid.ToString() },
+                { "Type", "1" }
+            });
+            if (dt != null)
+            {
+                foreach (var item in dt)
+                {
+                    CauseItems.Add(item);
+                }
+            }
+        }
+    }
+}

XXCpzs/ViewModels/RuCangViewModel.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class RuCangViewModel : BaseViewModel
+    {
+        public ObservableCollection<DepartmentItem> CangKuItems { set; get; } = new ObservableCollection<DepartmentItem>();
+        public ObservableCollection<ResultModel> Items { get; set; }
+        public RuCangViewModel(UserInfo userInfo)
+        {
+            Title = "产品入仓登记";
+            Items = new ObservableCollection<ResultModel>();
+            Dictionary<string, string> _body = new Dictionary<string, string>{
+                { "companyId", userInfo.CompanyId.ToString()}
+            };
+
+            List<DepartmentItem> buMens = HttpHelper.RefreshData<DepartmentItem>(03, RestSharp.Method.POST, _body);
+            foreach (var item in buMens)
+            {
+                CangKuItems.Add(item);
+            }
+        }
+    }
+}

XXCpzs/ViewModels/SaleViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using Xamarin.Forms;
+using XXCpzs.Models;
+using XXCpzs.Views;
+
+namespace XXCpzs.ViewModels
+{
+    class SaleViewModel : BaseViewModel
+    {
+        public ObservableCollection<ResultModel> Items { set; get; }
+        string companyName = string.Empty;
+        public string CompanyName
+        {
+            get { return companyName; }
+            set { SetProperty(ref companyName, value); }
+        }
+
+        public int CustomerId = 0;
+
+        public SaleViewModel()
+        {
+            Title = "产品销售";
+            Items = new ObservableCollection<ResultModel>
+            {
+                new ResultModel { Data = "序列号", Msg = "提交结果" }
+            };
+            MessagingCenter.Subscribe<PageCustomerSelect, Customer>(this, "SelectCustomer", async (obj, item) =>
+            {
+                var newItem = item as Customer;
+                this.CompanyName = newItem.company + ">>" + newItem.contacts;
+                this.CustomerId = newItem.id;
+            });
+        }
+    }
+}

XXCpzs/ViewModels/SearchViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Input;
+using Xamarin.Forms;
+using XXCpzs.helper;
+using XXCpzs.Models;
+using XXCpzs.Services;
+using XXCpzs.Views;
+
+namespace XXCpzs.ViewModels
+{
+    class SearchViewModel : BaseViewModel
+    {
+
+        public ICommand PerformSearch => new Command<string>((string query) =>
+        {
+            SearchResults = CustomerDataService.GetSearchResults(query);
+        });
+
+        List<Customer> searchResults = CustomerDataService.Fruits;
+        public List<Customer> SearchResults
+        {
+            get
+            {
+                return searchResults;
+            }
+            set
+            {
+                searchResults = value;
+                OnPropertyChanged();
+                //NotifyPropertyChanged();
+            }
+        }
+
+        private int deviceId = 1;
+        private PageCustomerSelect pageCustomerSelect;
+
+        public SearchViewModel(int Uid, PageCustomerSelect pageCustomerSelect)  
+        {
+            this.pageCustomerSelect = pageCustomerSelect;
+            Title = "客户选择";
+            this.pageCustomerSelect = pageCustomerSelect;
+            var dt = HttpHelper.RefreshData<Customer>(15,
+                RestSharp.Method.POST,
+                new Dictionary<string, string>{
+                { "Uid", Uid.ToString() },
+                { "deviceId", deviceId.ToString() }
+            });
+            if (dt != null)
+            {
+                foreach (var item in dt)
+                {
+                    CustomerDataService.Fruits.Add(item);
+                }
+            }
+            MessagingCenter.Subscribe<PageAddCustomer, Customer>(this, "AddCustomer", async (obj, item) =>
+            {
+                var newItem = item as Customer;
+                Console.WriteLine(">>>>>>>>>" + item.company);
+
+                CustomerDataService.AddItem(newItem);
+                pageCustomerSelect.Refresh();
+            });
+
+        }
+
+    }
+}

XXCpzs/ViewModels/TuiHuoViewModel.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Text;
+using XXCpzs.helper;
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    class TuiHuoViewModel : BaseViewModel
+    {
+        public ObservableCollection<CauseItem> CauseItems { set; get; } = new ObservableCollection<CauseItem>();
+
+        public ObservableCollection<ResultModel> Items { set; get; }
+        public TuiHuoViewModel(int Uid)
+        {
+            Title = "产品再销申请";
+            Items = new ObservableCollection<ResultModel> { };
+            List<CauseItem> dt = HttpHelper.RefreshData<CauseItem>(17,
+                RestSharp.Method.POST,
+                new Dictionary<string, string>{
+                { "Uid", Uid.ToString() },
+                { "Type", "4" }
+            });
+            if (dt != null)
+            {
+                foreach (var item in dt)
+                {
+                    CauseItems.Add(item);
+                }
+            }
+        }
+    }
+}