Heim  >  Artikel  >  Backend-Entwicklung  >  Was ist MVVM-Architektur und Datenbindung?

Was ist MVVM-Architektur und Datenbindung?

零下一度
零下一度Original
2017-06-24 09:25:163097Durchsuche

 

(申明:最近在做一个练习,写点东西,谨供参考。)

1、界面展示:其中的布局和样式就不说了,重点在MVVM架构和数据绑定(Model层使用EF(Entity Framework)实体框架,不做介绍)。

 

绑定后:

2、架构介绍:

在Views层中新建CusGroupEditWindow窗体,ViewModels中建立CusGroupEditViewModel类,在窗体的xaml或者cs中引用ViewModels对应类:

   xaml中:

    c879f5c3c9893e45ba2ce7d26e997114   

          92c72cd9b9c57deded9b4898c5a2dbe2 1da84c50fa7328704b2ce9dda53aedda     

      7473f81b006ddc8e53f2d378bc7dce62

  cs:DataContext = CusGroupEditViewModel。(添加引用路径)

/***********************************************/

*CsGroup是在ViewModel中定义的一个CusGroup对象,    *

*CusGroup对象是在SQL数据库中的表,在EF中的对象。    *

/***********************************************/

3、TextBox绑定:

  ff1681ddee25e4aeb6879b3c67fb00b5

4、Button绑定:

  5d362da14155c388b940c2445466edf6         

            29deedf2cd939b8bccbf37085c6a617a8b6de9c7d98b148f30b5dd6899a18be9

      a1cb88e6789f399807801ea3799938af 

dfca9557cc388af630eeba6df35e96f8

c05eec64ed02ad0975536668a09b61b7

5、CheckBox绑定:

  04efaf97de328fe03fc57ff1cb705f93

  456c2222d60e5b20af2a55c567b254f7 6、ComboBox绑定:

6、ComboBox绑定:

<ComboBox MaxWidth="150" Width="100" SelectedValue="{Binding StrCMBselectValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" DisplayMemberPath="Text"
                                              SelectedValuePath="Value" ItemsSource="{Binding LstCSGDownLevelID, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" />

 

 

 b33558531c9bd20894e37c6740957f48

65f8f648affa7f9bf7c2b3b9504200a2                                                 

7、DataGrid绑定:

<DataGrid ColumnWidth="*" SelectedItem="{Binding CurrentSelectItem}"  ItemsSource="{Binding CsGroupsAll}" AutoGenerateColumns="False"  IsReadOnly="True" >
                                <DataGrid.Columns>
                                    <DataGridTextColumn Header="分组编号" Binding="{Binding Code}" />
                                    <DataGridTextColumn Header="分组名称" Binding="{Binding Name}" />
                                </DataGrid.Columns>
                            </DataGrid>

 

/***************************************************************/

        //DataGrid当前选择对象private CusGroup currentSelectItem;public CusGroup CurrentSelectItem
        {get { return currentSelectItem; }set{
                currentSelectItem = value;

                GetCutCmbSelect(value);
            }
        }
View Code

 

3a102498773156c85fe31b421356ccfb

/***************************************************************/

 

ViewModel 中的代码:

   
   
using HeYin.ERP.DataModels;using HeYin.ERP.IServices;using HeYin.ERP.Models;using HeYin.ERP.Services;using Microsoft.Practices.Prism.Commands;using System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Windows;using System.Text.RegularExpressions;using System.Windows.Controls;namespace HeYin.ERP.Client.ViewModels.Customer
{class CusGroupEditViewModel : BaseViewModel
    {private bool bIsAdd = false;

        ICusGroupService CGS;  //调用IService接口#region Properties 属性private Guid gCsGroupID = Guid.Empty;//All CusGroupprivate List12a277596269c1ca26ae0578ebbecfb8 csGroupsAll;public List12a277596269c1ca26ae0578ebbecfb8 CsGroupsAll
        {get { return csGroupsAll; }set{
                csGroupsAll = value; //设定值OnPropertyChanged("CsGroupsAll"); //在属性更改后,通知            }
        }private List12a277596269c1ca26ae0578ebbecfb8 csGroupsMinPrestore;public List12a277596269c1ca26ae0578ebbecfb8 CsGroupsAllMinPrestore
        {get { return csGroupsMinPrestore; }set{
                csGroupsMinPrestore = value; //设定值OnPropertyChanged("CsGroupsAllMinPrestore"); //在属性更改后,通知            }
        }//CusGroup对象private CusGroup csGroup;public CusGroup CsGroup
        {get { return csGroup; }set{ csGroup = value;
                OnPropertyChanged("CsGroup"); }
        }/// 631fb227578dfffda61e1fa4d04b7d25/// /// 039f3e95db2a684c7b74365531eb6044private string strCMBselectValue;public string StrCMBselectValue
        {get { return strCMBselectValue; }set{if (value != null)
                {
                    strCMBselectValue = value;
                    OnPropertyChanged("StrCMBselectValue");
                }
            }
        }/// 631fb227578dfffda61e1fa4d04b7d25/// ComboBoxDataModel:作为一个ComboBox的对象,可以理解为数据源/// 039f3e95db2a684c7b74365531eb6044private ObservableCollection2584f245219aed0baedf79a7e59b6c50 lstCSGDownLevelID;public ObservableCollection2584f245219aed0baedf79a7e59b6c50 LstCSGDownLevelID
        {get { return lstCSGDownLevelID; }set{
                lstCSGDownLevelID = value;
                OnPropertyChanged("LstCSGDownLevelID");
            }
        }//DataGrid当前选择对象private CusGroup currentSelectItem;public CusGroup CurrentSelectItem
        {get { return currentSelectItem; }set{
                currentSelectItem = value;

                GetCutCmbSelect(value);
            }
        }private int errorCount;public int ErrorCount { get => errorCount; set => errorCount = value; }#endregion#region Commandspublic DelegateCommand98c455a79ddfebb79781bff588e7b37e BtnChangedCommand { get; set; }public DelegateCommand12a277596269c1ca26ae0578ebbecfb8 TxtChangedCommand { get; set; }        #endregionpublic CusGroupEditViewModel()
        {
            CGS = new CusGroupService();
            CsGroupsAll = new List12a277596269c1ca26ae0578ebbecfb8();
            csGroup = new CusGroup();
            LstCSGDownLevelID = new ObservableCollection2584f245219aed0baedf79a7e59b6c50();
            BtnChangedCommand = new DelegateCommand98c455a79ddfebb79781bff588e7b37e(MenuClick);
            TxtChangedCommand = new DelegateCommand12a277596269c1ca26ae0578ebbecfb8(ChangeCMBValue);

            GetAllCusGroups();
        }#region ButtonClickprivate void MenuClick(string strMessage)
        {if (string.IsNullOrEmpty(strMessage)) return;if (CsGroup == null) return;switch (strMessage)
            {case "btnCusGroupSave":
                    Save();break;case "btnCusGroupAdd":
                    Add();break;case "btnCusGroupDelete":
                    Delete();break;
            }
        }#endregion ButtonClick#region motheds/// 631fb227578dfffda61e1fa4d04b7d25/// 获取全部Group/// 039f3e95db2a684c7b74365531eb6044private void GetAllCusGroups()
        {//获取满足条件的客户分组信息            CsGroupsAll.Clear();
            CsGroupsAll = CGS.Get(s => s.IsDelete == 0);

            GetAllCMBItems();//给降档分组下拉框赋值if ((gCsGroupID == null || gCsGroupID == Guid.Empty) && CsGroupsAll.Count > 0)
                CsGroup = CsGroupsAll[0];    //给基础信息等赋值StrCMBselectValue = CsGroup.DownLevelID.ToString();//设置降档分组默认值        }/// 631fb227578dfffda61e1fa4d04b7d25/// 添加/// 039f3e95db2a684c7b74365531eb6044/// 871df4e675f01b90b299b5458b6fbd688bb7487ae6a16a43571bc14c7fcf93c2private void AddCusGroup(CusGroup cg)
        {
            cg.ID = Guid.NewGuid(); //新建分组GUIDcg.IsDelete = 0;        //默认为0:不删除cg.CreateBy = App.GetCurrentUserId();//创建人员关联员工 GUIDcg.CreateTime = DateTime.Now;  //初始化创建时间,应该使用服务器当前时间bool c = CGS.Add(cg);if (c)
            {
                MessageBox.Show(string.Format("创建新组别【{0}】成功!", CsGroup.Name), "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                GetAllCusGroups();
                bIsAdd = false;
            }
        }/// 631fb227578dfffda61e1fa4d04b7d25/// 修改/// 039f3e95db2a684c7b74365531eb6044/// 871df4e675f01b90b299b5458b6fbd688bb7487ae6a16a43571bc14c7fcf93c2private void UpdateCusGroup(CusGroup cg)
        {
            bIsAdd = false;

            cg.UpdateTime = DateTime.Now;
            cg.UpdateBy = App.GetCurrentUserId();//更新人员关联员工 GUIDstring[] str = { "UpdateTime", "UpdateBy" };bool b = CGS.Edit(cg, str);if (b)
            {
                MessageBox.Show("更改组别【成功】!", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                GetAllCusGroups();
            }
        }/// 631fb227578dfffda61e1fa4d04b7d25///删除方法(实为更新)/// 039f3e95db2a684c7b74365531eb6044/// 871df4e675f01b90b299b5458b6fbd688bb7487ae6a16a43571bc14c7fcf93c2private void DeleteCusGroup(CusGroup cg)
        {
            cg.IsDelete = 1; //更改数据库删除标志cg.UpdateTime = DateTime.Now;  //更新删除时间cg.UpdateBy = App.GetCurrentUserId();//更新人员关联员工 GUIDstring[] str = { "UpdateTime", "IsDelete", "UpdateBy" };bool b = CGS.Edit(cg, str);if (b)
            {//MessageBox.Show(string.Format("已删除组别【{0}】!", CsGroup.Name), "提示", MessageBoxButton.OK, MessageBoxImage.Information);                GetAllCusGroups();
                CsGroup = new CusGroup(); //清空对象bIsAdd = true;
            }
        }/// 631fb227578dfffda61e1fa4d04b7d25/// 插入和更新方法调用/// 039f3e95db2a684c7b74365531eb6044private void Save()
        {if (ErrorCount > 0)
            {//判断必填数据是否为空:为空则提示MessageBox.Show("请核对所填数据", "提示", MessageBoxButton.YesNo, MessageBoxImage.Information);return;
            }if (bIsAdd)
                AddCusGroup(CsGroup);elseUpdateCusGroup(CsGroup);
        }/// 631fb227578dfffda61e1fa4d04b7d25/// 获取降档分组下拉列表的值,并指定默认值/// 039f3e95db2a684c7b74365531eb6044/// baf7518bd06a20614696879534a64e8e8bb7487ae6a16a43571bc14c7fcf93c2private void GetCutCmbSelect(CusGroup value)
        {
            bIsAdd = false;//点击新增后,再选择列表的逻辑if (value != null)
            {
                CsGroup = CGS.GetById(value.ID);//查找出当前选中的对象gCsGroupID = CsGroup.ID;        //保存当前选择对象的GUIDif (CsGroup != null)
                {if (CsGroup.DownLevelID.HasValue)
                    {//如果降档ID有值,则默认显示,如果没有,则显示为空GetExceptCMBSelect();//刷新下拉列表,先刷新,再赋值给默认值StrCMBselectValue = CsGroup.DownLevelID.ToString();
                    }else{
                        LstCSGDownLevelID.Clear();
                        StrCMBselectValue = string.Empty;
                    }
                }
            }
        }private void Add()
        {
            bIsAdd = true;//点击新建分组时,重新获取所有降档ID对应的中文名            GetAllCMBItems();

            CsGroup = new CusGroup();
        }private void Delete()
        {if (this.CsGroup.ID == Guid.Empty || CsGroup.ID == null)
                MessageBox.Show("请选择要删除组别", "提示", MessageBoxButton.OK, MessageBoxImage.Information);else{
                MessageBoxResult msgResult = MessageBox.Show(string.Format("确定要删除分组【{0}】吗?", CsGroup.Name), "提示", MessageBoxButton.YesNo, MessageBoxImage.Information);if (msgResult == MessageBoxResult.Yes)
                    DeleteCusGroup(CsGroup);
            }
        }/// 631fb227578dfffda61e1fa4d04b7d25/// 排除当前列的降档ID和对应的Name/// 039f3e95db2a684c7b74365531eb6044private void GetExceptCMBSelect()
        {
            LstCSGDownLevelID.Clear();
            CsGroupsAllMinPrestore = CGS.Get(s => s.IsDelete == 0 && s.MinPrestore <= CsGroup.MinPrestore);foreach (var iDlID in CsGroupsAllMinPrestore)
            {if (iDlID.ID != CsGroup.ID) //去除当前选择ID对应的NameLstCSGDownLevelID.Add(new ComboBoxDataModel() { Value = iDlID.ID.ToString(), Text = iDlID.Name });
            }
        }/// 631fb227578dfffda61e1fa4d04b7d25/// 获取列表中所有降档ID和对应的Name/// 039f3e95db2a684c7b74365531eb6044private void GetAllCMBItems()
        {
            LstCSGDownLevelID.Clear();foreach (var iDlID in CsGroupsAll)
            {
                LstCSGDownLevelID.Add(new ComboBoxDataModel() { Value = iDlID.ID.ToString(), Text = iDlID.Name });
            }
        }private void ChangeCMBValue(CusGroup cgMinPrestore)
        {
            LstCSGDownLevelID.Clear();
            List12a277596269c1ca26ae0578ebbecfb8 lstTextChange = new List12a277596269c1ca26ae0578ebbecfb8();
            lstTextChange = CGS.Get(s => s.MinPrestore < cgMinPrestore.MinPrestore);foreach (var iDlID in lstTextChange)
            {
                LstCSGDownLevelID.Add(new ComboBoxDataModel() { Value = iDlID.ID.ToString(), Text = iDlID.Name });
            }
        }public void SizeChangedCommand(object obj, SizeChangedEventArgs e)
        {

            MessageBox.Show("日了狗");

        }#endregion}
}

 

View中代码:



    
        
            
        
    

    

        
            
            
        

        
            
                
                
            

            
            
                
                    
                        
                            
                                
                                

                                
                            
                        
                    

                    
                        
                            <DataGrid ColumnWidth="*" SelectedItem="{Binding CurrentSelectItem}"  ItemsSource="{Binding CsGroupsAll}" AutoGenerateColumns="False"  IsReadOnly="True" >
                                <DataGrid.Columns>
                                    <DataGridTextColumn Header="分组编号" Binding="{Binding Code}" />
                                    <DataGridTextColumn Header="分组名称" Binding="{Binding Name}" />
                                </DataGrid.Columns>
                            </DataGrid>
                        
                    
                
            

            
            
                
                    
                    
                    
                

                
                
                    
                        
                            
                        

                        
                            
                                
                                    
                                    
                                

                                
                                
                                    
                                    
                                        
                                            
                                                
                                                    
                                                    
                                                
                                            
                                        
                                    
                                

                                
                                    
                                    
                                        
                                            
                                                
                                                    
                                                    
                                                
                                            
                                        
                                    
                                
                            

                            
                                
                                    

                                    
                                        
                                            
                                                
                                                    
                                                    
                                                
                                            
                                        
                                    
                                
                            
                        
                    
                

                
                
                    
                        
                            
                                
                            

                            
                                
                                    
                                    
                                

                                
                                    
                                    
                                
                                
                                    
                                    
                                
                            
                        
                    
                

                
                
                    
                        
                            
                        

                        
                            
                                
                                    
                                    
                                

                                
                                    
                                    
                                
                                
                                    
                                    
                                
                            

                            
                                
                                    
                                    <ComboBox MaxWidth="150" Width="100" SelectedValue="{Binding StrCMBselectValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" DisplayMemberPath="Text"
                                              SelectedValuePath="Value" ItemsSource="{Binding LstCSGDownLevelID, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" />
                                
                            
                        
                    
                
            
        

        
        
            
                
            
        
    

 

Das obige ist der detaillierte Inhalt vonWas ist MVVM-Architektur und Datenbindung?. Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!

Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn