[英]UWP Combobox SelectedItem from GridView Control and also Bind selection change value to model with MVVM Pattern
我在尝试着
<Button Content="Update" Grid.Row="12" Height="35" Grid.Column="0" Margin="90,15,0,0" Name="btnUpdate"
VerticalAlignment="Top" Width="141"
Command="{Binding Path=UpdateCommand}"
CommandParameter="{Binding Path=_Userdetails}"
>
</Button>
<controls:DataGrid x:Name="dgvEmpList" Margin="0,0,480,457"
Grid.Row="1" Grid.RowSpan="12" Grid.Column="1" GridLinesVisibility="All"
AlternatingRowBackground="LightBlue"
HeadersVisibility="Column"
ItemsSource="{Binding Users, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedUser, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
AutoGenerateColumns="False"
>
<controls:DataGrid.Columns>
<controls:DataGridTextColumn
Header="UserId"
Binding="{Binding UserId}"
/>
<controls:DataGridTextColumn
Header="FirstName"
Binding="{Binding FirstName}"
/>
<controls:DataGridTextColumn
Header="LastName"
Binding="{Binding LastName}"
/>
<controls:DataGridTextColumn
Header="City"
Binding="{Binding City}" />
<controls:DataGridTextColumn
Header="State"
Binding="{Binding State}" />
<controls:DataGridTextColumn
Header="Country"
Binding="{Binding Country}" />
</controls:DataGrid.Columns>
</controls:DataGrid>
</Grid>
我的文本框和组合框如下所示：
<TextBlock x:Name="label2" Padding="18,0,0,0" Margin="10,20,0,0" Text="First Name :" Grid.Row="2" Grid.Column="0" TextAlignment="Center" VerticalAlignment="Center" HorizontalAlignment="Left" Height="19" Width="86"/>
<TextBox x:Name="txtFName" TextWrapping="Wrap" Text="{Binding _Userdetails.FirstName,Mode=TwoWay}" SelectedText="{Binding SelectedUser.FirstName}" AcceptsReturn="True" PlaceholderText="Enter FirstName ..." Grid.Row="3" Grid.Column="0" Width="292" TextAlignment="Left" VerticalAlignment="Bottom" HorizontalAlignment="Left" Margin="28,0,0,0" Height="32"></TextBox>
<ComboBox x:Name="cmbCountry" PlaceholderText="Select Country ..." Text="{Binding _Userdetails.Country,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Grid.Row="11" Grid.Column="0" Width="292" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="28,0,0,0" Height="32">
<ComboBoxItem Content="India"></ComboBoxItem>
<ComboBoxItem Content="Canada"></ComboBoxItem>
<ComboBoxItem Content="USA"></ComboBoxItem>
<ComboBoxItem Content="ENGLAND"></ComboBoxItem>
<ComboBoxItem Content="New Zealand"></ComboBoxItem>
</ComboBox>
模型 ：
public class User : BindableBase
{
private int userId;
private string firstName;
private string lastName;
private string city;
private string state;
private string country;
public int UserId
{
get
{
return userId;
}
set
{
userId = value;
OnPropertyChanged("UserId");
}
}
public string FirstName
{
get
{
return firstName;
}
set
{
firstName = value;
OnPropertyChanged("FirstName");
}
}
public string LastName
{
get
{
return lastName;
}
set
{
lastName = value;
OnPropertyChanged("LastName");
}
}
public string City
{
get
{
return city;
}
set
{
city = value;
OnPropertyChanged("City");
}
}
public string State
{
get
{
return state;
}
set
{
state = value;
OnPropertyChanged("State");
}
}
public string Country
{
get
{
return country;
}
set
{
country = value;
OnPropertyChanged("Country");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
查看型号：
public class UserViewModel : User,INotifyPropertyChanged
{
private ObservableCollection<User> _UsersList { get; set; }
private User selecteduser;
public event PropertyChangedEventHandler PropertyChanged;
public User _Userdetails { get; set; }
protected void OnPropertyChanged(string propertyName)//string propertyName
{
if (PropertyChanged != null)
{
PropertyChangedEventArgs args = new PropertyChangedEventArgs(propertyName);
this.PropertyChanged(this, args);
}
}
public UserViewModel()
{
_UsersList = new ObservableCollection<User>
{
new User{UserId = 1,FirstName="Raj",LastName="Beniwal",City="Delhi",State="DEL",Country="INDIA"},
new User{UserId=2,FirstName="Mark",LastName="henry",City="New York", State="NY", Country="USA"},
new User{UserId=3,FirstName="Mahesh",LastName="Chand",City="Philadelphia", State="PHL", Country="USA"},
new User{UserId=4,FirstName="Vikash",LastName="Nanda",City="Noida", State="UP", Country="CANADA"},
new User{UserId=5,FirstName="Harsh",LastName="Kumar",City="Ghaziabad", State="UP", Country="INDIA"},
new User{UserId=6,FirstName="Reetesh",LastName="Tomar",City="Mumbai", State="MP", Country="INDIA"},
new User{UserId=7,FirstName="Deven",LastName="Verma",City="Palwal", State="HP", Country="ENGLAND"},
new User{UserId=8,FirstName="Ravi",LastName="Taneja",City="Delhi", State="DEL", Country="INDIA"}
};
try
{
_Userdetails = new User();
}
catch
{
}
UpdateCommand = new RelayCommand(AddUserMethod);
}
public RelayCommand UpdateCommand { get; set; }
public void AddUserMethod(object parameter)
{
try
{
_UsersList.Add(
new User
{
FirstName = _Userdetails.FirstName,
LastName = _Userdetails.LastName,
City = _Userdetails.City,
Country = _Userdetails.Country,
State = _Userdetails.State,
UserId = _Userdetails.UserId
});
}
catch
{
}
}
public User userdetails
{
get
{
return _Userdetails;
}
set
{
_Userdetails = value;
OnPropertyChanged("userdetails");
}
}
public User SelectedUser
{
get
{
return selecteduser;
}
set
{
selecteduser = value;
OnPropertyChanged("SelectedUser");
}
}
public ObservableCollection<User> Users
{
get
{ return _UsersList; }
set
{
_UsersList = value;
OnPropertyChanged("Users");
}
}
}
我已经为文本框控件完成了这个工作，但对于组合框我找不到我想要做的，所以请帮助我
但是当尝试在组合框中做同样的事情并且它不起作用时，我的组合框没有任何项目源，它只有静态项目列表。
问题是您为ComboBox绑定了错误的属性（文本属性）。 对于您的场景，您需要为ComboBox制作一个国家/地区列表并绑定SelectedItem属性。 我已经重写了你的代码。 请检查以下内容。
用户.cs
public class User : ViewModelBase
{
private int userId;
private string firstName;
private string lastName;
private string city;
private string state;
private string country;
public int UserId
{
get
{
return userId;
}
set
{
userId = value;
OnPropertyChanged("UserId");
}
}
public string FirstName
{
get
{
return firstName;
}
set
{
firstName = value;
OnPropertyChanged("FirstName");
}
}
public string LastName
{
get
{
return lastName;
}
set
{
lastName = value;
OnPropertyChanged("LastName");
}
}
public string City
{
get
{
return city;
}
set
{
city = value;
OnPropertyChanged("City");
}
}
public string State
{
get
{
return state;
}
set
{
state = value;
OnPropertyChanged("State");
}
}
public string Country
{
get
{
return country;
}
set
{
country = value;
OnPropertyChanged("Country");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
用户模型.cs
public class UserViewModel : User, INotifyPropertyChanged
{
private ObservableCollection<User> _usersList;
private User _userdetails;
private User _selecteduser;
private string _countrySelectItem;
public ObservableCollection<string> CountryList { get; set; }
public User Userdetails
{
get
{
return _userdetails;
}
set
{
_userdetails = value;
OnPropertyChanged("Userdetails");
}
}
public string CountrySelectItem
{
get
{
return _countrySelectItem;
}
set
{
_countrySelectItem = value;
_userdetails.Country = _countrySelectItem;
OnPropertyChanged("CountrySelectItem");
}
}
public User SelectedUser
{
get
{
return _selecteduser;
}
set
{
_selecteduser = value;
if( CountryList.Any(p => p == _selecteduser.Country))
{
CountrySelectItem = _selecteduser.Country;
}else
{
CountrySelectItem = null;
}
OnPropertyChanged("SelectedUser");
}
}
public ObservableCollection<User> Users
{
get
{ return _usersList; }
set
{
_usersList = value;
OnPropertyChanged("Users");
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)//string propertyName
{
if (PropertyChanged != null)
{
PropertyChangedEventArgs args = new PropertyChangedEventArgs(propertyName);
this.PropertyChanged(this, args);
}
}
public UserViewModel()
{
_usersList = new ObservableCollection<User>
{
new User{UserId=1,FirstName="Raj",LastName="Beniwal",City="Delhi",State="DEL",Country="INDIA"},
new User{UserId=2,FirstName="Mark",LastName="henry",City="New York", State="NY", Country="USA"},
new User{UserId=3,FirstName="Mahesh",LastName="Chand",City="Philadelphia", State="PHL", Country="USA"},
new User{UserId=4,FirstName="Vikash",LastName="Nanda",City="Noida", State="UP", Country="CANADA"},
new User{UserId=5,FirstName="Harsh",LastName="Kumar",City="Ghaziabad", State="UP", Country="INDIA"},
new User{UserId=6,FirstName="Reetesh",LastName="Tomar",City="Mumbai", State="MP", Country="INDIA"},
new User{UserId=7,FirstName="Deven",LastName="Verma",City="Palwal", State="HP", Country="ENGLAND"},
new User{UserId=8,FirstName="Ravi",LastName="Taneja",City="Delhi", State="DEL", Country="INDIA"},
new User{UserId=9,FirstName="Nico",LastName="Ming",City="WuXi", State="DEL", Country="China"}
};
CountryList = new ObservableCollection<string>()
{
"INDIA",
"CANADA",
"USA",
"ENGLAND",
"New Zealand"
};
try
{
_userdetails = new User();
}
catch
{
}
UpdateCommand = new RelayCommand<User>(AddUserMethod);
}
public RelayCommand<User> UpdateCommand { get; set; }
public void AddUserMethod(User parameter)
{
try
{
_usersList.Add(
new User
{
FirstName = _userdetails.FirstName,
LastName = _userdetails.LastName,
City = _userdetails.City,
Country = _userdetails.Country,
State = _userdetails.State,
UserId = _userdetails.UserId
});
}
catch
{
}
}
}
Xaml 代码
<Page.DataContext>
<local:UserViewModel x:Name="ViewModel" />
</Page.DataContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="6*" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Button
Name="btnUpdate"
Grid.Row="0"
Width="141"
Height="35"
Margin="90,15,0,0"
VerticalAlignment="Top"
Command="{Binding Path=UpdateCommand}"
CommandParameter="{Binding Path=Userdetails}"
Content="Update"
/>
<controls:DataGrid
x:Name="dgvEmpList"
Grid.Row="1"
AlternatingRowBackground="LightBlue"
AutoGenerateColumns="False"
GridLinesVisibility="All"
HeadersVisibility="Column"
ItemsSource="{Binding Users, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedUser, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
>
<controls:DataGrid.Columns>
<controls:DataGridTextColumn Binding="{Binding UserId}" Header="UserId" />
<controls:DataGridTextColumn Binding="{Binding FirstName}" Header="FirstName" />
<controls:DataGridTextColumn Binding="{Binding LastName}" Header="LastName" />
<controls:DataGridTextColumn Binding="{Binding City}" Header="City" />
<controls:DataGridTextColumn Binding="{Binding State}" Header="State" />
<controls:DataGridTextColumn Binding="{Binding Country}" Header="Country" />
</controls:DataGrid.Columns>
</controls:DataGrid>
<TextBox
x:Name="txtFName"
Grid.Row="2"
Grid.RowSpan="2"
Width="292"
Height="32"
Margin="28,0,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
AcceptsReturn="True"
PlaceholderText="Enter FirstName ..."
SelectedText="{Binding SelectedUser.FirstName}"
Text="{Binding Userdetails.FirstName, Mode=TwoWay}"
TextAlignment="Left"
TextWrapping="Wrap"
/>
<ComboBox
x:Name="cmbCountry"
Grid.Row="4"
Width="292"
Height="32"
Margin="28,0,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Center"
ItemsSource="{Binding CountryList}"
PlaceholderText="Select Country ..."
SelectedItem="{Binding CountrySelectItem,Mode=TwoWay}"
>
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</Grid>
这是您可以参考的完整代码项目。
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