C# 如何在我的场景中使用MVVM动态更新datagrid

我正在练习MVVM应用程序，我是初学者，我正在尝试做的是，我在一个网格中有3行，第一行将包含3个标签和3个相应的按钮。第二行将包含一个按钮，用于保存在第一行文本框中输入的数据。第三行将包含具有相同数量和类型的文本框（三个）的datagrid

看这里可以看到

用户将在第一行输入数据，然后按第二行的保存按钮，然后必须在相应的datagrid列中找到写入的信息

我的尝试在这里（整个代码）：

视图：

视图模型：

   class ViewModel
    {
        public bool canExecute { get; set; }
        private RelayCommand saveStudentRecord; 
        private ObservableCollection<Model> dGrid;
        public ViewModel()
        {

        }

        private void MyAction()
        {
           //What to do here to pass all that data to the datagrid corresponding columns
        }     
    }

类视图模型
{
公共布尔canExecute{get；set；}
专用中继命令存储中心线；
私人可观察收集dGrid；
公共视图模型（）
{
}
私人行动
{
//在这里，如何将所有数据传递到datagrid对应的列
}     
}

我哪里有问题？

---

我已经设计了整个主体，但我无法找到逻辑，即如何将文本框中输入的数据分配给按钮单击事件上相应的数据网格列，并仅使用MVVM将它们绑定

应该很简单，只需将新模型添加到

ObservableCollection DGrid

：

 class ViewModel
    {
        public bool canExecute { get; set; }
        private RelayCommand saveStudentRecord; 
        private ObservableCollection<Model> dGrid;
        public ViewModel()
        {
            dGrid = new ObservableCollection<Model>();
        }

        private void MyAction()
        {
           dGrid.Add(new Model(){
               TextName = valueOfTextTextBox,
               RollNumber = valueOfRollNumberTextBox,
               Class = valueOfClassTextBox
           });
        }     
    }

EDIT2-忘记添加XAML部分：）您需要将文本框绑定到新属性

<Window x:Class="WpfApplication4.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="30"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <TextBox Grid.Column="1" Grid.Row="0" Text="{Binding EditedModel.TextName}" Height="20" Width="80" HorizontalAlignment="Center"></TextBox>
            <TextBox Grid.Column="1" Grid.Row="1" Text="{Binding EditedModel.RollNumber}"  Height="20" Width="80"></TextBox>
            <TextBox Grid.Column="1" Grid.Row="2" Text="{Binding EditedModel.Class}" Height="20" Width="80"></TextBox>
            <Label Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center">Name</Label>
            <Label Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center">RollNumber</Label>
            <Label Grid.Row="2" HorizontalAlignment="Center" VerticalAlignment="Center">Class</Label>
        </Grid>
        <Grid Grid.Row="1" >
            <Button Width="80" Height="20" Command="{Binding saveStudentRecord}"> Save</Button>
        </Grid>
        <Grid Grid.Row="2">
            <DataGrid ItemsSource="{Binding DGrid}">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Name" Binding="{Binding dgName}" Width="150"></DataGridTextColumn>
                    <DataGridTextColumn Header="Rollnumber" Binding="{Binding dgRollnumber}" Width="150"></DataGridTextColumn>
                    <DataGridTextColumn Header="Class" Binding="{Binding dgClass}" Width="150"></DataGridTextColumn>
                </DataGrid.Columns>
            </DataGrid>
        </Grid>
    </Grid>
</Window>

名称
卷数
等级
拯救

您需要将DataGrid绑定到一个集合，可能是一个ObservableCollection，然后在命令中更新ObservableCollection。好的，但是这些ValueOfTextBox，valueOfRollNumberTextBox必须通过用户动态获取，如何在视图模型中获取它们，我无法理解，事实上，这是您解释的第一件事，但我无法得到如何在textbox中获取用户输入的值。而且行“TextName=valueoftextextbox”是一个错误“TextName无法分配，它是只读的”。@Swietek，抱歉，感谢您的帮助，它仍然无法工作，这行是“dGrid.Add”（EditModel）；”将始终具有空值“EditModel”，单击按钮时，这意味着绑定未正确完成，或者用户输入的数据未读取并存储在其中properly@struggling我的错误，首先忘记创建EditModel对象。ViewModel的构造函数应该是：

public ViewModel（）{dGrid=new ObservableCollection（）；EditedModel=new Model（）；}

 class ViewModel
    {
        public bool canExecute { get; set; }
        private RelayCommand saveStudentRecord; 
        private ObservableCollection<Model> dGrid;
        public ViewModel()
        {
            dGrid = new ObservableCollection<Model>();
        }

        private void MyAction()
        {
           dGrid.Add(new Model(){
               TextName = valueOfTextTextBox,
               RollNumber = valueOfRollNumberTextBox,
               Class = valueOfClassTextBox
           });
        }     
    }

public ObservableCollection<Model> dGrid {
    get;
    private set;
}

 class ViewModel
    {
        public bool canExecute { get; set; }
        private RelayCommand saveStudentRecord; 
        private ObservableCollection<Model> dGrid;
        public ViewModel()
        {
            dGrid = new ObservableCollection<Model>();
        }

        public Model EditedModel {
            get {
                return _editedModel;
            }
            set {
                _editedModel = value;
                SignalPropertyChanged("EditedModel");
            }
        }

        private void MyAction()
        {
           dGrid.Add(EditedModel);
           EditedModel = new Model();
        }

        void SignalPropertyChanged(string propertyName){
            if(propertyChanged !=null){
                propertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }


    }

class Model : INotifyPropertyChanged
{
    private string textName;
    public string TextName
    {
        get { return textName; }
        set { 
            textName = value; 
            SignalPropertyChanged("TextName");
         }
    }

    private string rollNumber;
    public string RollNumber
    {
        get { return rollNumber; }
        set { 
            rollNumber= value; 
            SignalPropertyChanged("RollNumber");
         }
    }
    private string cclass;
    public string Class
    {
        get { return cclass; }
        set { 
            cclass= value; 
            SignalPropertyChanged("Class");
         }
    }

    public event PropertyChangedEventHandler propertyChanged;
    void SignalPropertyChanged(string propertyName){
        if(propertyChanged !=null){
            propertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

<Window x:Class="WpfApplication4.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="30"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <TextBox Grid.Column="1" Grid.Row="0" Text="{Binding EditedModel.TextName}" Height="20" Width="80" HorizontalAlignment="Center"></TextBox>
            <TextBox Grid.Column="1" Grid.Row="1" Text="{Binding EditedModel.RollNumber}"  Height="20" Width="80"></TextBox>
            <TextBox Grid.Column="1" Grid.Row="2" Text="{Binding EditedModel.Class}" Height="20" Width="80"></TextBox>
            <Label Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center">Name</Label>
            <Label Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center">RollNumber</Label>
            <Label Grid.Row="2" HorizontalAlignment="Center" VerticalAlignment="Center">Class</Label>
        </Grid>
        <Grid Grid.Row="1" >
            <Button Width="80" Height="20" Command="{Binding saveStudentRecord}"> Save</Button>
        </Grid>
        <Grid Grid.Row="2">
            <DataGrid ItemsSource="{Binding DGrid}">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Name" Binding="{Binding dgName}" Width="150"></DataGridTextColumn>
                    <DataGridTextColumn Header="Rollnumber" Binding="{Binding dgRollnumber}" Width="150"></DataGridTextColumn>
                    <DataGridTextColumn Header="Class" Binding="{Binding dgClass}" Width="150"></DataGridTextColumn>
                </DataGrid.Columns>
            </DataGrid>
        </Grid>
    </Grid>
</Window>