[英]How to read XML document and append the values of it to combo boxes and textboxes
編輯Model.cs:
private ObservableCollection<string> color;
public ObservableCollection<string> Color
{
get { return color; }
set
{
color = value;
NotifyPropertyChanged("Color");
}
}
private ObservableCollection<string> shapes;
public ObservableCollection<string> Shapes
{
get { return shapes; }
set
{
shapes = value;
NotifyPropertyChanged("Shapes");
}
}
private ObservableCollection<string> size;
public ObservableCollection<string> Size
{
get { return size; }
set
{
size = value;
NotifyPropertyChanged("Size");
}
}
編輯ViewModel.cs:
private string selectedcolor;
public string SelectedColor
{
get { return selectedcolor; }
set
{
if (value != selectedcolor)
{
selectedcolor = value; NotifyPropertyChanged("SelectedColor");
}
}
}
private string selectedshapes;
public string SelectedShapes
{
get { return selectedshapes; }
set
{
if (value != selectedshapes)
{
selectedshapes = value; NotifyPropertyChanged("SelectedShapes");
}
}
}
private string selectedsize;
public string SelectedSize
{
get { return selectedsize; }
set
{
if (value != selectedsize)
{
selectedsize = value; NotifyPropertyChanged("SelectedSize");
}
}
}
XML 文檔: (xml 文檔的名稱是 EditingsValue.xml)
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE MYEDITINGS[]>
<MYEDITINGS>
<Group name="GeneralEditings">
<EditingsName name="COLOR" value="red"/>
<EditingsName name="SHAPES" value="circle"/>
<EditingsName name="SIZE" value="medium"/>
<EditingsName name="FILE PATH" value="C:\ProgramFiles"/>
</Group>
</MYEDITINGS>
編輯視圖.xaml:
<ComboBox SelectedValue="{Binding SelectedColor,Mode=TwoWay}" Height="25" Width="150" HorizontalContentAlignment="Right" VerticalAlignment="Center" ItemsSource="{Binding Color}"/ >
<ComboBox SelectedValue="{Binding SelectedShapes,Mode=TwoWay}" Height="25" Width="150" HorizontalContentAlignment="Right" VerticalAlignment="Center" ItemsSource="{Binding Shapes}"/ >
<ComboBox SelectedValue="{Binding SelectedSize,Mode=TwoWay}" Height="25" Width="150" HorizontalContentAlignment="Right" VerticalAlignment="Center" ItemsSource="{Binding Size}" />
<TextBox Height="26" Grid.Column="3" IsReadOnly="True" TextAlignment="Right" VerticalContentAlignment="Center" HorizontalAlignment="Left" VerticalAlignment="Center" Width="150" Text="{Binding ElementName=Mygroups, Path=DataContext.FolderPath,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" />
<Button KeyboardNavigation.TabIndex="2" Grid.Column="4" Content="Browse" Height="29" VerticalAlignment="Bottom" MinWidth="45" Command="{Binding ElementName=Mygeoups,Path=DataContext.FolderCommand}" CommandParameter="{Binding}" />
在我上面的代碼中,我使用SelectedIndex為我的組合框設置默認值,然后允許用戶選擇他們自己的值。 然后我如上所述在XML 文檔中寫入用戶的選定值。 到目前為止,一切正常。 但現在我的要求是,如果我再次打開我的應用程序,我不應該在組合框和文本框中獲取默認值,而是應該讀取 xml 文檔並在我的組合框和文本框中顯示該值。
如何使用 MVVM (wpf) 實現這一點。 誰能幫我嗎。
提前致謝。
我想,這個對你有幫助
對於EditingsViewModel.cs構造函數讀取 Xml 文件,將值分配給模型
public EditingsViewModel()
{
ComboBoxModel = new EditingModel();
//Xml Path
string xmlpath = @"D:\MyDocument.xml";
var doc = new XmlDocument();
doc.Load(xmlpath);
XmlNode colorNode = doc.SelectSingleNode(@"/MYEDITINGS/Group/EditingsName[@name = 'COLOR']/@value");
XmlNode shapesNode = doc.SelectSingleNode(@"/MYEDITINGS/Group/EditingsName[@name = 'SHAPES']/@value");
XmlNode sizeNode = doc.SelectSingleNode(@"/MYEDITINGS/Group/EditingsName[@name = 'SIZE']/@value");
XmlNode filePathNode = doc.SelectSingleNode(@"/MYEDITINGS/Group/EditingsName[@name = 'FILE PATH']/@value");
//Binding the Color to the Color Property
var observableColors = new System.Collections.ObjectModel.ObservableCollection<string>() { "red","yellow","green"};
ComboBoxModel.Color = observableColors;
//Binding the Shapes to the Shape Property
var observableShapes = new System.Collections.ObjectModel.ObservableCollection<string>() { "circle", "Triangle", "Rectangle" };
ComboBoxModel.Shapes = observableShapes;
//Binding the Size to the Size Property
var observableSize = new System.Collections.ObjectModel.ObservableCollection<string>() { "medium", "high", "low" };
ComboBoxModel.Size = observableSize;
//Assign the Color Default vlaue from the Xml Document
SelectedColor = colorNode.Value;
//Assign the Shape Default vlaue from the Xml Document
SelectedShapes = shapesNode.Value;
//Assign the Size Default vlaue from the Xml Document
SelectedSize = sizeNode.Value;
//Assign the FilePath Default vlaue from the Xml Document
FolderPath = filePathNode.Value;
}
EditingsView.xaml - 刪除選定的索引屬性
<ComboBox SelectedValue="{Binding SelectedColor,Mode=TwoWay}" Height="25" Width="150" HorizontalContentAlignment="Right" VerticalAlignment="Center" ItemsSource="{Binding ComboBoxModel.Color}"/>
<ComboBox SelectedValue="{Binding SelectedShapes,Mode=TwoWay}" Height="25" Width="150" HorizontalContentAlignment="Right" VerticalAlignment="Center" ItemsSource="{Binding ComboBoxModel.Shapes}"/>
<ComboBox SelectedValue="{Binding SelectedSize,Mode=TwoWay}" Height="25" Width="150" HorizontalContentAlignment="Right" VerticalAlignment="Center" ItemsSource="{Binding ComboBoxModel.Size}" />
<TextBox Name="Mygroups" Height="26" Grid.Column="3" IsReadOnly="True" TextAlignment="Right" VerticalContentAlignment="Center" HorizontalAlignment="Left" VerticalAlignment="Center" Width="150" Text="{Binding ElementName=Mygroups, Path=DataContext.FolderPath,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" />
<Button KeyboardNavigation.TabIndex="2" Grid.Column="4" Content="Browse" Height="29" VerticalAlignment="Bottom" MinWidth="45" Command="{Binding ElementName=Mygeoups,Path=DataContext.FolderCommand}" CommandParameter="{Binding}" />
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