如何显示从文本框的值和从组合框到ListView列的SelectedItem
我想从组合框到列表视图列中显示所选CourseName和CourseiD的值
我可以显示年龄和加入日期。请提出我需要做的更改。
我正在从CombobBox中将选定项目的值放入ViewModel中的不同属性“ SelectedCourseName”和“ SelectedCourseId”中。
请帮助以及如何获取学生可观察集合中的值，因为它是我的ListView的ItemSource。
学生班（模型班）
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MVVMDemo
{
public class Student
{
public string Name { get; set; }
public int Age { get; set; }
public string Course { get; set; }
public DateTime JoiningDate { get; set; }
public string CourseName { get; set; }
public string CourseID { get; set; }
}
}
MainWindow.Xaml
<Window x:Class="MVVMDemo.UserRegistrationView"
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:MVVMDemo"
Title="Window1" Height="300" Width="575.851">
<Window.Resources>
<viewmodel:ViewModel x:Key="ViewModel"/>
<viewmodel:DatetimeToDateConverter x:Key="MyConverter"/>
</Window.Resources>
<Grid DataContext="{Binding Source={StaticResource ViewModel}}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="Name" HorizontalAlignment="Center"/>
<TextBox Grid.Row="0" Grid.Column="1" Width="100" HorizontalAlignment="Center" Text="{Binding Student.Name, Mode=TwoWay}" Margin="76,0"/>
<TextBlock Grid.Row="1" Grid.Column="0" Text="Age" HorizontalAlignment="Center"/>
<TextBox Grid.Row="1" Grid.Column="1" Width="100" HorizontalAlignment="Center" Text="{Binding Student.Age, Mode=TwoWay}"/>
<Button Content="Submit" Command="{Binding SubmitCommand}" HorizontalAlignment="Right" Grid.Row="2" Grid.Column="0"/>
<ComboBox Grid.Column="1" ItemsSource="{Binding FillCourseId}" Name="cmb_CourseIDName" HorizontalAlignment="Left" Margin="164.191,5,0,0"
Grid.Row="3" VerticalAlignment="Top" Width="168.342" Grid.RowSpan="2" DataContext="{Binding Source={StaticResource ViewModel}}" FontSize="8" IsReadOnly="True"
SelectedValue="{Binding SelectedCourseIdName,Mode=TwoWay}" RenderTransformOrigin="1.431,0.77">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding Path=CourseName, Mode=TwoWay}"/>
<TextBlock Text=" - "/>
<TextBlock Text="{Binding Path=CourseID, Mode=TwoWay}"/>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<ListView ItemsSource="{Binding Students}" Grid.Row="4" Grid.Column="1" Margin="62.551,54.019,78.762,76.829"
ScrollViewer.CanContentScroll="False"
ScrollViewer.VerticalScrollBarVisibility="Visible">
<ListView.View >
<GridView >
<GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="60"/>
<GridViewColumn Header="Age" DisplayMemberBinding="{Binding Age}" Width="60"/>
<GridViewColumn Header="Joining Date" DisplayMemberBinding="{Binding JoiningDate, Converter={StaticResource MyConverter}}" Width="80" />
<GridViewColumn Header="Course Name" DisplayMemberBinding="{Binding SelectedCourseName}" Width="80"/>
<GridViewColumn Header="CourseId" DisplayMemberBinding="{Binding SelectedCourseId}" Width="60"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
ViewModel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using System.Collections.ObjectModel;
using System.Data.SqlClient;
using System.Data;
using System.ComponentModel;
namespace MVVMDemo
{
public class ViewModel : ViewModelBase
{
static String connectionString = @"Data Source=RaMCO-PC\SQLEXPRESS;Initial Catalog=SIT_Ramco_DB;Integrated Security=True;";
SqlConnection con;
SqlCommand cmd;
private Student _student;
private ObservableCollection<Student> _students;
private ICommand _SubmitCommand;
public Student Student
{
get
{
return _student;
}
set
{
_student = value;
NotifyPropertyChanged("Student");
}
}
private ObservableCollection<Student> _fillCourseId = new ObservableCollection<Student>();
public ObservableCollection<Student> FillCourseId
{
get { return _fillCourseId; }
set
{
_fillCourseId = value;
OnPropertyChanged("SystemStatusData");
}
}
public ObservableCollection<Student> Students
{
get
{
return _students;
}
set
{
_students = value;
NotifyPropertyChanged("Students");
}
}
private Student _selectedcourseIdname;
public Student SelectedCourseIdName
{
get { return _selectedcourseIdname; }
set
{
_selectedcourseIdname = value;
OnPropertyChanged("SelectedCourseIdName");
}
}
public string SelectedCourseId
{
get { return _selectedcourseIdname.CourseID; }
set
{
_selectedcourseIdname.CourseID = value;
OnPropertyChanged("SelectedCourseId");
}
}
public string SelectedCourseName
{
get { return _selectedcourseIdname.CourseName; }
set
{
_selectedcourseIdname.CourseName = value;
OnPropertyChanged("SelectedCourseName");
}
}
public ICommand SubmitCommand
{
get
{
if (_SubmitCommand == null)
{
_SubmitCommand = new RelayCommand(param => this.Submit(),
null);
}
return _SubmitCommand;
}
}
//********************************************* Functions*******************************************//
public void GetCourseIdFromDB()
{
try
{
con = new SqlConnection(connectionString);
con.Open();
cmd = new SqlCommand("select * from dev_Course", con);
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
adapter.Fill(dt);
// Student Student = new Student();
for (int i = 0; i < dt.Rows.Count; ++i)
FillCourseId.Add(new Student
{
CourseID = dt.Rows[i][0].ToString(),
CourseName = dt.Rows[i][1].ToString()
});
}
catch (Exception ex)
{
}
}
public ViewModel()
{
Student = new Student();
Students = new ObservableCollection<Student>();
Students.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(Students_CollectionChanged);
GetCourseIdFromDB();
}
void Students_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
NotifyPropertyChanged("Students");
}
private void Submit()
{
Student.JoiningDate = DateTime.Today.Date;
Students.Add(Student);
Student = new Student();
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyname)
{
var handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyname));
}
}
}
MainWindow.Xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using System.Collections.ObjectModel;
using System.Data.SqlClient;
using System.Data;
using System.ComponentModel;
namespace MVVMDemo
{
public class ViewModel : ViewModelBase
{
static String connectionString = @"Data Source=RITESH-PC\SQLEXPRESS;Initial Catalog=SIT_Ritesh_DB;Integrated Security=True;";
SqlConnection con;
SqlCommand cmd;
private Student _student;
private ObservableCollection<Student> _students;
private ICommand _SubmitCommand;
public Student Student
{
get
{
return _student;
}
set
{
_student = value;
NotifyPropertyChanged("Student");
}
}
private ObservableCollection<Student> _fillCourseId = new ObservableCollection<Student>();
public ObservableCollection<Student> FillCourseId
{
get { return _fillCourseId; }
set
{
_fillCourseId = value;
OnPropertyChanged("SystemStatusData");
}
}
public ObservableCollection<Student> Students
{
get
{
return _students;
}
set
{
_students = value;
NotifyPropertyChanged("Students");
}
}
private Student _selectedcourseIdname;
public Student SelectedCourseIdName
{
get { return _selectedcourseIdname; }
set
{
_selectedcourseIdname = value;
OnPropertyChanged("SelectedCourseIdName");
}
}
public string SelectedCourseId
{
get { return _selectedcourseIdname.CourseID; }
set
{
_selectedcourseIdname.CourseID = value;
OnPropertyChanged("SelectedCourseId");
}
}
public string SelectedCourseName
{
get { return _selectedcourseIdname.CourseName; }
set
{
_selectedcourseIdname.CourseName = value;
OnPropertyChanged("SelectedCourseName");
}
}
public ICommand SubmitCommand
{
get
{
if (_SubmitCommand == null)
{
_SubmitCommand = new RelayCommand(param => this.Submit(),
null);
}
return _SubmitCommand;
}
}
//********************************************* Functions*******************************************//
public void GetCourseIdFromDB()
{
try
{
con = new SqlConnection(connectionString);
con.Open();
cmd = new SqlCommand("select * from dev_Course", con);
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
adapter.Fill(dt);
// Student Student = new Student();
for (int i = 0; i < dt.Rows.Count; ++i)
FillCourseId.Add(new Student
{
CourseID = dt.Rows[i][0].ToString(),
CourseName = dt.Rows[i][1].ToString()
});
}
catch (Exception ex)
{
}
}
public ViewModel()
{
Student = new Student();
Students = new ObservableCollection<Student>();
Students.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(Students_CollectionChanged);
GetCourseIdFromDB();
}
void Students_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
NotifyPropertyChanged("Students");
}
private void Submit()
{
Student.JoiningDate = DateTime.Today.Date;
Students.Add(Student);
Student = new Student();
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyname)
{
var handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyname));
}
}
}
0 个答案:
没有答案
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