WPF+MVVM+EF示例1
实现了那些功能，先看看效果图：
项目工程目录：
接下来开始具体的步骤：
第一步：在VS中新建工程
第二步：使用NuGet 安装EntityFramework
第三步：使用NuGet 安装EntityFramework.SqlSreverCompact
第四步：在Entities文件夹下添加StudentEntity类
1 public class StudentEntity
2 {
3 public int StudentId { get; set; }
4 public string StudentName { get; set; }
5 public int StudentAge { get; set; }
6 public int StudentSex { get; set; }
7 public string StudentAddress { get; set; }
8
9 }
第五步：在Mappings文件夹下添加实体映射StudentEntityMapping类
public class StudentEntityMapping : EntityTypeConfiguration<StudentEntity>
{
public StudentEntityMapping()
{
this.HasKey(t => t.StudentId);
this.ToTable("Student");
this.Property(t => t.StudentId).HasColumnName("StudentId").HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity).IsRequired();
this.Property(t => t.StudentName).HasColumnName("StudentName").HasColumnType(SqlDbType.NVarChar.ToString()).HasMaxLength(50).IsRequired();
this.Property(t => t.StudentAge).HasColumnName("StudentAge").HasColumnType(SqlDbType.Int.ToString()).IsRequired();
this.Property(t => t.StudentSex).HasColumnName("StudentSex").HasColumnType(SqlDbType.Int.ToString()).IsRequired();
this.Property(t => t.StudentAddress).HasColumnName("StudentAddress").HasColumnType(SqlDbType.NVarChar.ToString()).HasMaxLength(200).IsRequired();
}
}
第六步：在Dal文件夹下添加StudentDataContext类
public class StudentDataContext : DbContext
{
public StudentDataContext()
: base("StudentDataContext")
{
}
public DbSet<StudentEntity> Students { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.AddFromAssembly(typeof(StudentDataContext).Assembly);
}
}
第七步：在AppConfig添加数据库的连接字符串
注意此处的路径必须为绝对路径
<connectionStrings>
<add name="StudentDataContext" providerName="System.Data.SqlServerCe.4.0" connectionString="Data Source=E:\Sample\DataBase\StudentDataContext.sdf" />
</connectionStrings>
第八步：在NuGet包管理器中打开“程序包管理器控制台”
第九步：生成Migrations文件并创建数据库
A,在打开的程序包管理器控制台中输入 enable-migrations 命令此时会自动在工程目录下创建一个Migrations文件夹和Configuration.cs
B,打开Configuration.cs 修改 AutomaticMigrationsEnabled = true;
C,在打开的程序包管理器控制台中输入update-database
D，执行完成后就会在E:\Sample\DataBase\StudentDataContext.sdf下创建好数据库，将此数据库包含在项目中并将其包含在项目中，并将其设置为始终复制，编译项目，
并再次修改App.Config中的连接字符串。connectionString="Data Source=DataBase\StudentDataContext.sdf"
第十步：在Dal下添加一个用于操作数据的类StudentDal
public class StudentDal
{
StudentDataContext studentDataContext = new StudentDataContext();
public List<StudentEntity> GetAllStudent()
{
return studentDataContext.Students.ToList();
}
public void Insert(StudentEntity studentEntity)
{
studentDataContext.Students.Add(studentEntity);
studentDataContext.SaveChanges();
}
public void Delete(StudentEntity studentEntity)
{
studentDataContext.Students.Remove(studentEntity);
studentDataContext.SaveChanges();
}
public void Update(StudentEntity studentEntity)
{
var id = studentDataContext.Students.Find(studentEntity.StudentId);
var entry = studentDataContext.Entry(id);
entry.CurrentValues.SetValues(studentEntity);
entry.Property(p => p.StudentId).IsModified = false;
studentDataContext.SaveChanges();
}
}
第十一步：在Views文件加下添加AddOrEditWindow.xaml和StudentControl.xaml
StudentControl.xaml
<UserControl x:Class="Sample.Views.StudentControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:viewModel="clr-namespace:Sample.ViewModels"
xmlns:convert="clr-namespace:Sample.Convert"
mc:Ignorable="d" >
<UserControl.Resources>
<Style TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="HorizontalContentAlignment" Value="Center" />
<Setter Property="VerticalContentAlignment" Value="Center" />
</Style>
<convert:ConvertIntToString x:Key="convertIntToString" ></convert:ConvertIntToString>
</UserControl.Resources>
<UserControl.DataContext>
<viewModel:StudentViewModel></viewModel:StudentViewModel>
</UserControl.DataContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="40"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Button Width="80" Height="30" Content="添加" HorizontalAlignment="Right" Margin="0,0,20,0" Grid.Row="0" Command="{Binding AddCommand}"></Button>
<Button Width="80" Height="30" Content="刷新" HorizontalAlignment="Right" Margin="0,0,120,0" Grid.Row="0" Command="{Binding RefreshCommand}"/>
<Rectangle Fill="Black" Height="1" Grid.Row="0" VerticalAlignment="Bottom"></Rectangle>
<DataGrid Grid.Row="1" ItemsSource="{Binding Students}" SelectedItem="{Binding SelectStudentEntity, Mode=TwoWay}" CanUserSortColumns="False" CanUserResizeColumns="False" CanUserResizeRows="False" SelectionMode="Extended"
CanUserReorderColumns="False" RowHeaderWidth="0" CanUserAddRows="False" AutoGenerateColumns="False" EnableRowVirtualization="False" GridLinesVisibility="None" Margin="5" >
<DataGrid.Columns>
<DataGridTemplateColumn Header="编号" Width="80" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding StudentId}" HorizontalAlignment="Center" VerticalAlignment="Center" ></TextBlock>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="姓名" Width="120" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding StudentName}" HorizontalAlignment="Center" VerticalAlignment="Center" ></TextBlock>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="性别" Width="80" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding StudentSex,Converter={StaticResource convertIntToString}}" HorizontalAlignment="Center" VerticalAlignment="Center" ></TextBlock>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="年龄" Width="80" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding StudentAge}" HorizontalAlignment="Center" VerticalAlignment="Center" ></TextBlock>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="家庭住址" Width="180" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding StudentAddress}" HorizontalAlignment="Center" VerticalAlignment="Center" ></TextBlock>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Width="150" Header="操作">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
<Button Width="40" Height="20" Content="编辑" FontSize="10" Command="{Binding DataContext.EditCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=UserControl}}" ></Button>
<Button Width="40" Height="20" Margin="10,0,0,0" Content="删除" FontSize="10" Command="{Binding DataContext.DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=UserControl}}" ></Button>
</StackPanel>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
</UserControl>
AddOrEditWindow.xaml
1 <Window x:Class="Sample.Views.AddOrEditWindow"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:viewModel="clr-namespace:Sample.ViewModels"
5 Title="AddOrEditWindow" Height="280" Width="300" WindowStartupLocation="CenterScreen" Topmost="True" ResizeMode="NoResize">
6 <Window.DataContext>
7 <viewModel:AddOrEditViewModel></viewModel:AddOrEditViewModel>
8 </Window.DataContext>
9 <Grid>
10 <Grid.RowDefinitions>
11 <RowDefinition Height="50"></RowDefinition>
12 <RowDefinition Height="50"></RowDefinition>
13 <RowDefinition Height="50"></RowDefinition>
14 <RowDefinition Height="50"></RowDefinition>
15 <RowDefinition Height="*"></RowDefinition>
16 </Grid.RowDefinitions>
17 <Grid.ColumnDefinitions>
18 <ColumnDefinition Width="100"></ColumnDefinition>
19 <ColumnDefinition Width="*"></ColumnDefinition>
20 </Grid.ColumnDefinitions>
21 <Label Grid.Row="0" Grid.Column="0" Content="学生姓名:" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,0,10,0"></Label>
22 <Label Grid.Row="1" Grid.Column="0" Content="学生年龄:" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,0,10,0"></Label>
23 <Label Grid.Row="2" Grid.Column="0" Content="学生性别:" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,0,10,0"></Label>
24 <Label Grid.Row="3" Grid.Column="0" Content="家庭住址:" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,0,10,0"></Label>
25 <TextBox Grid.Row="0" Grid.Column="1" Width="160" Height="25" Text="{Binding CurrentStudentEntity.StudentName,Mode=TwoWay}"></TextBox>
26 <TextBox Grid.Row="1" Grid.Column="1" Width="160" Height="25" Text="{Binding CurrentStudentEntity.StudentAge,Mode=TwoWay}"></TextBox>
27 <StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="1" Margin="20,0,0,0">
28 <RadioButton GroupName="sex" Content="男" VerticalAlignment="Center" IsChecked="{Binding IsChecked,Mode=TwoWay}"></RadioButton>
29 <RadioButton GroupName="sex" Content="女" VerticalAlignment="Center" Margin="20,0,0,0"></RadioButton>
30 </StackPanel>
31 <TextBox Grid.Row="3" Grid.Column="1" Width="160" Height="25" Text="{Binding CurrentStudentEntity.StudentAddress,Mode=TwoWay}"></TextBox>
32 <Rectangle Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2" Fill="Black" Height="1" VerticalAlignment="Bottom"></Rectangle>
33 <Button Content="保存" Width="80" Height="30" Grid.Row="4" Grid.Column="1" Command="{Binding SaveCommand}"></Button>
34 </Grid>
35 </Window>
第十二步：在ViewModels中添加AddOrEditViewModel.cs和StudentViewModel.cs
StudentViewModel.cs代码：
public class StudentViewModel : ViewModelBase
{
private List<StudentEntity> _students;
public List<StudentEntity> Students
{
get { return _students; }
set
{
if (_students != value)
{
_students = value;
this.OnPropertyChanged(r => r.Students);
}
}
}
private StudentEntity _studentEntity;
public StudentEntity SelectStudentEntity
{
get { return _studentEntity; }
set
{
if (_studentEntity != value)
{
_studentEntity = value;
this.OnPropertyChanged(r => r.SelectStudentEntity);
}
}
}
public ICommand AddCommand { get; set; }
public ICommand RefreshCommand { get; set; }
public ICommand EditCommand { get; set; }
public ICommand DeleteCommand { get; set; }
private StudentDal studentDal = null;
public StudentViewModel()
{
studentDal = new StudentDal();
AddCommand = new DelegateCommand(AddStuddent);
RefreshCommand = new DelegateCommand(Refresh);
EditCommand = new DelegateCommand(EditStudent);
DeleteCommand = new DelegateCommand(DeleteStudent);
Students = new List<StudentEntity>();
Students = studentDal.GetAllStudent();
}
private void AddStuddent()
{
AddOrEditWindow addOrEditWindow = new AddOrEditWindow();
addOrEditWindow.Show();
var addOrEditViewModel = (addOrEditWindow.DataContext as AddOrEditViewModel);
addOrEditViewModel.CurrentStudentEntity = new StudentEntity();
addOrEditViewModel.IsAdd = true;
addOrEditViewModel.StudentDal = studentDal;
}
private void Refresh()
{
Students = studentDal.GetAllStudent();
}
private void EditStudent()
{
AddOrEditWindow addOrEditWindow = new AddOrEditWindow();
addOrEditWindow.Show();
var addOrEditViewModel = (addOrEditWindow.DataContext as AddOrEditViewModel);
addOrEditViewModel.CurrentStudentEntity = SelectStudentEntity;
addOrEditViewModel.IsAdd = false;
addOrEditViewModel.StudentDal = studentDal;
}
private void DeleteStudent()
{
studentDal.Delete(SelectStudentEntity);
}
}
AddOrEditViewModel.cs代码：
public class AddOrEditViewModel :ViewModelBase
private StudentEntity _currentStudentEntity;
public StudentEntity CurrentStudentEntity
{
get { return _currentStudentEntity; }
set
{
if (_currentStudentEntity != value)
{
_currentStudentEntity = value;
if (_currentStudentEntity.StudentSex == 0)
{
IsChecked = true;
}
else
{
IsChecked = false ;
}
this.OnPropertyChanged(r => r.CurrentStudentEntity);
}
}
}
private bool _isChecked;
public bool IsChecked
{
get { return _isChecked; }
set
{
if (_isChecked != value)
{
_isChecked = value;
this.OnPropertyChanged(r => r.IsChecked);
}
}
}
public StudentDal StudentDal { get; set; }
private bool _isAdd = false;
public bool IsAdd
{
get { return _isAdd; }
set
{
if (_isAdd != value)
{
_isAdd = value;
this.OnPropertyChanged(r => r.IsAdd);
}
}
}
public ICommand SaveCommand { get; set; }
public AddOrEditViewModel()
{
SaveCommand = new DelegateCommand(Save);
}
private void Save()
{
StudentEntity student = new StudentEntity();
student.StudentName = CurrentStudentEntity.StudentName;
student.StudentAge = CurrentStudentEntity.StudentAge;
student.StudentSex = IsChecked ?0:1;
student.StudentAddress = CurrentStudentEntity.StudentAddress;
if (IsAdd)
{
StudentDal.Insert(student);
}
else
{
student.StudentId = CurrentStudentEntity.StudentId;
StudentDal.Update(student);
}
}
}
至于ViewModelBase.cs和DelegateCommand.cs这两个类可以在网上查查，这里就不贴了。
第十三步:对于性别的转换单独写了一个转化器ConvertIntToString.cs其主要功能是将数据库中的0和1转换为 “男”和“女”显示
[System.Windows.Data.ValueConversion(typeof(int), typeof(string))]
public class ConvertIntToString : System.Windows.Data.IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string sex="";
if (int.Parse(value.ToString()) == 0)
{
sex = "男";
}
else
{
sex = "女";
}
return sex;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
第十四步：在MainWindow.xaml中添加StudentControl控件
转自：https://i.cnblogs.com/EditPosts.aspx?opt=1
