我在这种情况下,我有ObservableCollection的"tablegenerateModel"类进一步包含ObservableCollection的"column_Data"类,这个"column_Data"类包含3个UI元素必须绑定到包含三列的DataGrid。你可以复制粘贴我的代码,如果你想,我已经写了所有的类和xaml为您验证我的代码所以我的Model.cs如下所示:
public class tablegenerateModel {
public ObservableCollection < column_Data > Column_data_List {
get;
set;
}
public int NumberOfColumns {
get;
set;
}
private ICommand _CreatColumnCommand; //THIS IS THE BUTTON EVENT GENERATED WHEN USER PRESS AN INTEGER VALUE IN "NumberOfColumns" AND PRESS "Create" button. So the "Column_data_List" will repeat that many times the value user entered
ViewModel vm;
public ICommand CreatColumnCommand {
get {
if (_CreatColumnCommand == null) {
_CreatColumnCommand = new RelayCommand(
param => vm = new ViewModel(this)
);
}
return _CreatColumnCommand;
}
}
}
public class column_Data {
public string Column_Name {
get;
set;
}
}
My View Model is:
public class ViewModel: INotifyPropertyChanged {
private ObservableCollection < tablegenerateModel > _lb_GlobalList;
private ObservableCollection < column_Data > _Column_data_List;
public ObservableCollection < tablegenerateModel > lb_GlobalList {
get {
return _lb_GlobalList;
}
set {
if (value != _lb_GlobalList) {
_lb_GlobalList = value;
RaisePropertyChanged("lb_GlobalList");
}
}
}
public ObservableCollection < column_Data > Column_data_List {
get {
return _Column_data_List;
}
set {
if (value != _Column_data_List) {
_Column_data_List = value;
RaisePropertyChanged("Column_data_List");
}
}
}
public ICommand ClickCommand
private bool _canExecute;
public ViewModel() {
_canExecute = true;
lb_GlobalList = new ObservableCollection < tablegenerateModel > ();
for (int i = 1; i < 6; i++) {
//Add To it data here
}
}
public ViewModel(tablegenerateModel tablegenerateModels) //IT WILL BE CALLED WHEN BUTTON WILL BE CLICKED (see tablegenerateModel class ICommand for it)
{
Column_data_List = new ObservableCollection < column_Data > ();
for (int i = 1; i < tablegenerateModels.NumberOfColumns; i++) { //Add data here
}
MessageBox.Show("The NumberOfColumns value is:" + tablegenerateModels.NumberOfColumns);
}
}
}
And View is:
<Window x:Class="PyXgen.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vM="clr-namespace:PyXgen" Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<vM:ViewModel></vM:ViewModel>
</Window.DataContext>
<Grid Name="ButtonsContainer">
<ListBox Grid.Row="1" ItemsSource="{Binding lb_GlobalList}" ScrollViewer.VerticalScrollBarVisibility="Auto" BorderBrush="Gray" Margin="0,30,0,0" Grid.RowSpan="2">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<StackPanel>
<Grid Margin="0,2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="45" />
<RowDefinition Height="45" />
<RowDefinition Height="45" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid Grid.Row="4">
<StackPanel>
<Grid Margin="0,2">
Grid.Row="0" Width="80px" Height="20px" Margin="20,5,0,0" Name="fname4"/>
<Button Grid.Row="1" Grid.Column="1" Height="25" Width="70" Content="Create" Command="{Binding CreatColumnCommand}" HorizontalAlignment="Center" VerticalAlignment="Center"></Button>
</Grid>
</StackPanel>
</Grid>
<Grid Margin="0,2" Grid.Row="5">
<DataGrid x:Name="gvSelectedCourses" Grid.Column="1" HorizontalAlignment="Center" ItemsSource="{Binding Column_data_List , Mode=TwoWay}" AutoGenerateColumns="False" Width="450">
<DataGrid.Columns>
<DataGridTextColumn Header="Column Name" Binding="{Binding ,Mode=TwoWay}" Width="150" />
</DataGrid.Columns>
</DataGrid>
</Grid>
</Grid>
</StackPanel>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Window>
按钮点击到"_CreatColumnCommand"(在tableGenerateModel类中)将调用ViewModel构造器传递"this"对象来获取输入的整数值以重复输入的整数值的DataGrid行数(该整数值输入在同一类的"NumberOfColumns"文本框中)
现在的问题是如何绑定"_Column_data_List",这样它将添加和更新DataGrid的行(由用户在文本框中输入的整数值)
当前,当我在文本框中输入整数值并单击"创建"按钮时,ViewModel构造器被调用,MessageBox弹出
MessageBox.Show("The NumberOfColumns value is:" + tablegenerateModels.NumberOfColumns);
如何将这个"_Column_data_List"绑定到这样它将添加或更新DataGrid的行(通过用户在文本框中输入的整数值,在上面的快照中)
谁能帮我一下?
按如下方式更新代码。你已经在tablegeneratedModel中绑定了可观察对象集合,但是你正在更新的是ViewModel上的一个。
public ViewModel(tablegenerateModel tablegenerateModels) //IT WILL BE CALLED WHEN BUTTON WILL BE CLICKED (see tablegenerateModel class ICommand for it)
{
tablegenerateModels.Column_data_List = new ObservableCollection<column_Data>();
for (int i = 1; i < tablegenerateModels.NumberOfColumns; i++)
{
Column_data_List.Add(lb_col = new column_Data()
{
Column_Name = "ColumnName" + i,
Data_Size = i,
Data_types = "Double" + i
});
}
MessageBox.Show("The NumberOfColumns value is:" + tablegenerateModels.NumberOfColumns);
}
'CreatColumnCommand'拼写错误,但始终如此,所以这不是你的问题。但是你的'CreatColumnCommand '不在视图模型中,而是在模型中。这是问题所在吗?
在给定的情况下,我必须在ObservableCollection内部有ObservableCollection,但如果你看到我的ViewModel,我试图添加到ViewModel中的Column_data_List,而我应该在模型本身(因为视图不会处理lb_GlobalList和Column_data_List)。