什么是MVVM架构和数据绑定？_ASP.NET

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什么是MVVM架构和数据绑定？

发布时间：2022-05-16 发布网站：脚本宝典

脚本宝典收集整理的这篇文章主要介绍了什么是MVVM架构和数据绑定？，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。

（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：

　　　　<Window.DataContext>

<local:CusGroupEditViewModel/>

　　　 </Window.DataContext>

　　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：

4、Button绑定：

</Button>

5、CheckBox绑定：

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}" />

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

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

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 List<CusGroup> csGroupsAll;public List<CusGroup> CsGroupsAll
        {get { return csGroupsAll; }set{
                csGroupsAll = value; //设定值OnPropertyChanged("CsGroupsAll"); //在属性更改后，通知            }
        }private List<CusGroup> csGroupsMinPreStore;public List<CusGroup> 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"); }
        }/// <summary>/// /// </summary>private string strCMBselectValue;public string StrCMBselectValue
        {get { return strCMBselectValue; }set{if (value != null)
                {
                    strCMBselectValue = value;
                    OnPropertyChanged("StrCMBselectValue");
                }
            }
        }/// <summary>/// ComboBoxDataModel：作为一个ComboBox的对象，可以理解为数据源/// </summary>private ObservableCollection<ComboBoxDataModel> lstCSGDownLevelID;public ObservableCollection<ComboBoxDataModel> 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 DelegateCommand<string> BtnChangedCommand { get; set; }public DelegateCommand<CusGroup> TxtChangedCommand { get; set; }        #endregionpublic CusGroupEditViewModel()
        {
            CGS = new CusGroupService();
            CsGroupsAll = new List<CusGroup>();
            csGroup = new CusGroup();
            LstCSGDownLevelID = new ObservableCollection<ComboBoxDataModel>();
            BtnChangedCommand = new DelegateCommand<string>(MenuClick);
            TxtChangedCommand = new DelegateCommand<CusGroup>(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/// <summary>/// 获取全部Group/// </summary>private 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        }/// <summary>/// 添加/// </summary>/// <param name="cg"></param>private 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;
            }
        }/// <summary>/// 修改/// </summary>/// <param name="cg"></param>private 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();
            }
        }/// <summary>///删除方法（实为更新）/// </summary>/// <param name="cg"></param>private 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;
            }
        }/// <summary>/// 插入和更新方法调用/// </summary>private 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);
        }/// <summary>/// 获取降档分组下拉列表的值，并指定默认值/// </summary>/// <param name="value"></param>private 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);
            }
        }/// <summary>/// 排除当前列的降档ID和对应的Name/// </summary>private 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 });
            }
        }/// <summary>/// 获取列表中所有降档ID和对应的Name/// </summary>private 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();
            List<CusGroup> lstTextChange = new List<CusGroup>();
            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：

<client:BaseWindow x:Class="HeYin.ERP.Client.Views.Customer.CusGroupEditWindow"
        XMlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:Interaction="http://schemas.microsoft.com/expression/2010/interactions"
        xmlns:Interactivity="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:CommonValidation="clr-namespace:HeYin.ERP.Common.Validation;asSEMbly=HeYin.ERP.Common"
        xmlns:client="clr-namespace:HeYin.ERP.Client"
        mc:Ignorable="d"
        x:Name="CusGroupWindow" 
        Title="客户分组" Height="500" Width="800" 
        WindowStartupLocation="centerOwner"
        Loaded="Window_Loaded" 
        MaxboXenable="True" 
        MinboxEnable="False" >

    <Interactivity:Interaction.Triggers>
        <Interactivity:EventTrigger EventName="SizeChanged">
            <Interaction:CallMethodAction TargetObject="{Binding}" MethodName="SizeChangedCommand"/>
        </Interactivity:EventTrigger>
    </Interactivity:Interaction.Triggers>

    <Grid>

        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="50" />
        </Grid.RowDefinitions>

        <Grid Grid.Row="0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"/>
                <ColumnDefinition Width="2*"/>
            </Grid.ColumnDefinitions>

            <!-- Left -->
            <Grid  Margin="5,0,5,5">
                <GroupBox Name="gbGroupData">
                    <GroupBox.HeaderTemplate>
                        <DataTemplate>
                            <WrapPanel Margin="{staticResource WrapPanelMarginForInfo}">
                                <TextBlock Text="客户分组"  Height="20" />
                                <Button Width="20" Height="20" Margin="50,0,0,0" 
                                        Command="{Binding DataContext.BtnChangedCommand,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=GroupBox}}"
                                        CommandParameter="btnCusGroupAdd"
                                        Visibility="{Binding SaveVisibility,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
                                    <Image Source="..\..\Resources\Images\16\Add.png" />
                                </Button>

                                <Button Width="20" Height="20" Margin="10,0,0,0" 
                                        Command="{Binding  DataContext.BtnChangedCommand,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=GroupBox}}" 
                                        CommandParameter="btnCusGroupDelete"
                                        Visibility="{Binding SaveVisibility,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
                                    <Image Source="..\..\Resources\Images\16\Clear.png" />
                                </Button>
                            </WrapPanel>
                        </DataTemplate>
                    </GroupBox.HeaderTemplate>

                    <Grid>
                        <Grid Grid.Row="1">
                            <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>
                        </Grid>
                    </Grid>
                </GroupBox>
            </Grid>

            <!-- Right -->
            <Grid Grid.Column="1" Margin="5">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*"/>
                    <RowDefinition Height="100"/>
                    <RowDefinition Height="130"/>
                </Grid.RowDefinitions>

                <!-- 基础信息 -->
                <Grid>
                    <GroupBox>
                        <GroupBox.Header>
                            <TextBlock Text="基础信息" Height="20"/>
                        </GroupBox.Header>

                        <StackPanel>
                            <Grid Margin="0,10">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*" />
                                    <ColumnDefinition Width="*" />
                                </Grid.ColumnDefinitions>

                                <TextBox  Visibility="Collapsed" x:Name="tbErrorCount" Text="{Binding ErrorCount, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"></TextBox>
                                <WrapPanel Margin="{StaticResource WrapPanelMarginForInfo}">
                                    <TextBlock Width="60" Margin="{StaticResource TextBlockMarginForMostLeft}"><Run Text="分组编号" /></TextBlock>
                                    <TextBox Name="txtCusGropCrod" MaxWidth="150" Width="100" 
                                             ToolTip="{Binding RelativeSource={RelativeSource self},Path=(Validation.Errors).CurrentItem.ErrorContent}" Validation.Error="Validation_Error">
                                        <TextBox.Text>
                                            <Binding Path="CsGroup.Code" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True" NotifyOnValidationError="True">
                                                <Binding.ValidationRules>
                                                    <ExceptionValidationRule></ExceptionValidationRule>
                                                    <CommonValidation:RequiredValidationRule MaxLenth="15" ErrorMessage="分组编号" IsRequired="True" ValidatesOnTargetUpdated="True" />
                                                </Binding.ValidationRules>
                                            </Binding>
                                        </TextBox.Text>
                                    </TextBox>
                                </WrapPanel>

                                <WrapPanel Margin="{StaticResource WrapPanelMarginForInfo}" Grid.Column="1">
                                    <TextBlock Text="分组名称" Width="60" Margin="{StaticResource TextBlockMarginForMostLeft}"/>
                                    <TextBox Name="txtCusGropName"  MaxWidth="150" Width="100" 
                                             ToolTip="{Binding RelativeSource={RelativeSource self},Path=(Validation.Errors).CurrentItem.ErrorContent}" Validation.Error="Validation_Error">
                                        <TextBox.Text>
                                            <Binding Path="CsGroup.Name" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True" NotifyOnValidationError="True">
                                                <Binding.ValidationRules>
                                                    <ExceptionValidationRule></ExceptionValidationRule>
                                                    <CommonValidation:RequiredValidationRule MaxLenth="15" ErrorMessage="分组名称" IsRequired="True" ValidatesOnTargetUpdated="True" />
                                                </Binding.ValidationRules>
                                            </Binding>
                                        </TextBox.Text>
                                    </TextBox>
                                </WrapPanel>
                            </Grid>

                            <Grid>
                                <WrapPanel Margin="{StaticResource WrapPanelMarginForInfo}">
                                    <TextBlock Margin="{StaticResource TextBlockMarginForMostLeft}" Width="60" Vert@R_512_2411@Alignment="Center"><Run Text="分组描述" /></TextBlock>

                                    <TextBox x:Name="tbRemark"  TextWrapping="Wrap" AcceptsReturn="True" VerticalScrollBarVisibility="Visible" Width="400" Height="90"
                             ToolTip="{Binding RelativeSource={RelativeSource self},Path=(Validation.Errors).CurrentItem.ErrorContent}" Validation.Error="Validation_Error">
                                        <TextBox.Text>
                                            <Binding Path="CsGroup.Description" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True" NotifyOnValidationError="True">
                                                <Binding.ValidationRules>
                                                    <ExceptionValidationRule></ExceptionValidationRule>
                                                    <CommonValidation:RequiredValidationRule MaxLenth="300" ErrorMessage="分组描述"  ValidatesOnTargetUpdated="True" />
                                                </Binding.ValidationRules>
                                            </Binding>
                                        </TextBox.Text>
                                    </TextBox>
                                </WrapPanel>
                            </Grid>
                        </StackPanel>
                    </GroupBox>
                </Grid>

                <!-- 消费相关 -->
                <Grid Grid.Row="1" Margin="0,10,0,10">
                    <Grid>
                        <GroupBox>
                            <GroupBox.Header>
                                <TextBlock Text="消费相关"/>
                            </GroupBox.Header>

                            <Grid Margin="0,10">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="*"/>
                                </Grid.ColumnDefinitions>

                                <WrapPanel Margin="{StaticResource WrapPanelMarginForInfo}">
                                    <TextBlock Text="消费积分" Width="60" Height="20" Margin="{StaticResource TextBlockMarginForMostLeft}" />
                                    <TextBox Name="txtCusGropJF" MaxWidth="150" Width="100" Text="{Binding CsGroup.PointConversion, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" />
                                </WrapPanel>
                                <WrapPanel Grid.Column="1" Margin="{StaticResource WrapPanelMarginForInfo}"  HorizontalAlignment="Left" VerticalAlignment="Center">
                                    <CheckBox Name="cbCash" Margin="0,0,5,0" IsChecked="{Binding CsGroup.IsCash}"/>
                                    <TextBlock Text="开通预存或储值时禁止现金交易" />
                                </WrapPanel>
                            </Grid>
                        </GroupBox>
                    </Grid>
                </Grid>

                <!-- 预存相关 -->
                <Grid Grid.Row="2">
                    <GroupBox>
                        <GroupBox.Header>
                            <TextBlock Text="预存相关"/>
                        </GroupBox.Header>

                        <StackPanel>
                            <Grid Margin="0,10">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="*"/>
                                </Grid.ColumnDefinitions>

                                <WrapPanel Margin="{StaticResource WrapPanelMarginForInfo}">
                                    <TextBlock Width="80" Margin="{StaticResource TextBlockMarginForMostLeft}" ><Run Text="预存最低充值"/></TextBlock>
                                    <TextBox MaxWidth="150" Width="100" Text="{Binding CsGroup.MinPrestore, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" />
                                </WrapPanel>
                                <WrapPanel Grid.Column="1" Margin="{StaticResource WrapPanelMarginForInfo}">
                                    <TextBlock Width="80" Text="金额低缺报警" Margin="{StaticResource TextBlockMarginForMostLeft}" />
                                    <TextBox MaxWidth="550" Width="100" Text="{Binding CsGroup.Alarm,Mode=TwoWay}" />
                                </WrapPanel>
                            </Grid>

                            <Grid Margin="0,5">
                                <WrapPanel Margin="{StaticResource WrapPanelMarginForInfo}">
                                    <TextBlock Width="190" Text="预存金额未达到最低要求时降档至" Margin="{StaticResource TextBlockMarginForMostLeft}"/>
                                    <ComboBox MaxWidth="150" Width="100" SelectedValue="{Binding StrCMBselectValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" DisplayMemberPath="Text"
                                              SelectedValuePath="Value" ItemsSource="{Binding LstCSGDownLevelID, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" />
                                </WrapPanel>
                            </Grid>
                        </StackPanel>
                    </GroupBox>
                </Grid>
            </Grid>
        </Grid>

        <!-- bottom -->
        <Grid Grid.Row="2">
            <WrapPanel HorizontalAlignment="Center" VerticalAlignment="Center" Margin="{StaticResource WrapPanelMarginForInfo}">
                <Button Margin="1" Command="{Binding BtnChangedCommand}" CommandParameter="btnCusGroupSave" Background="#fc8530" Style="{StaticResource SaveButtonStyle}"
                        Visibility="{Binding SaveVisibility,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" >
                    <TextBlock  Text="保存"  FontWeight="Bold" FontSize="16"></TextBlock>
                </Button>
            </WrapPanel>
        </Grid>
    </Grid>
</client:BaseWindow>

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