如何绑定级联组合框？ [英] How to do binding of cascading combo boxes?
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问题描述
ComboBox1
< ComboBox Grid.Column = 1 Grid.Row = 1 < span class =code-attribute>高度 = 23 HorizontalAlignment = 中心 保证金 = 2,2,0,0 名称< /温泉n> = comboBoxServer VerticalAlignment = 顶部 宽度 = 156 ItemsSource < span class =code-keyword> = {Binding ServerNameList} SelectedValuePath = key SelectedValue = {Binding serverSelected，Mode = OneWayToSource，UpdateSourceTrigger = PropertyChanged} >
< i：Interaction.Triggers >
< i：EventTrigger EventName = SelectionChanged >
< i：InvokeCommandAction 命令 = {Binding serverCommand} CommandParameter = {Binding ElementName = comboBoxServer，Path = SelectedItem} / >
< / i：EventTrigger >
< / i：Interaction.Triggers >
< / ComboBox >
ComboBox2
< ComboBox Grid.Column =1Grid.Row =2Height =23HorizontalAlignment =CenterMargin =2,2,0,0Name =comboBoxDBNameVerticalAlignment =TopWidth =156ItemsSource ={Binding DBNameList}SelectionCh anged =comboBoxServer_SelectionChangedSelectedValuePath =KeySelectedValue ={Binding serverSelected，Mode = TwoWay，UpdateSourceTrigger = PropertyChanged}>< / ComboBox>
ViewModel
List< string> _ServerNameList;
List< string> _DBNameList;
public List< string> ServerNameList
{
get {return _ServerNameList; }
设置
{
_ServerNameList = value;
}
}
public List< string> DBNameList
{
get {return _DBNameList; }
set
{
if（_DBNameList！= value）
{
_DBNameList = value;
RaisePropertyChanged（DBNameList）;
}
}
}
string _serverSelected;
public string serverSelected
{
get {return _serverSelected; }
设置
{
if（_serverSelected！= value）
{
_serverSelected = value;
RaisePropertyChanged（serverSelected）;
}
}
}
public BackUpViewModel（）
{
BackUpContext servObj = new BackUpContext（）;
_ServerNameList = servObj.GetServers（）;
serverCommand = new RelayCommand（fetchServer）;
_DBNameList = servObj.GetDatabases（serverSelected）;
}
public RelayCommand serverCommand {get;组;
public void fetchServer（对象服务器）
{
serverSelected = server.ToString（）;
}
ModelClass
public List< string> GetServers（）
{
XmlDocument doc = new XmlDocument（）;
doc.Load（@C：\ Users \477340 \Desktop\\\
ewFile.xml）;
XmlNodeList节点
= doc.SelectNodes（/ servers / server）;
foreach（节点中的XmlNode节点）
{
lstServerName.Add（node.Attributes [name]。InnerText）;
}
返回lstServerName;
}
public List< string> GetDatabases（字符串服务器）
{
XmlDocument doc = new XmlDocument（）;
doc.Load（@C：\ Users \477340 \Desktop\\\
ewFile.xml）;
XmlNodeList节点
= doc.SelectNodes（/ servers / server）;
foreach（节点中的XmlNode节点）
{
if（node.Attributes [name]。InnerText == server）
{
XmlNodeList databases = node.SelectNodes（database）;
foreach（数据库中的XmlNode数据库）
{
lstDBName.Add（db.InnerText）;
}
}
}
返回lstDBName;
}
解决方案
试试这些链接 -
Cascading Dropdown& ListBox中的多选选项使用WPF [ ^ ]
http://social.technet.microsoft.com/wiki/contents/articles/17946.cascading-comboboxes-in-wpf-using-mvvm.aspx [<一个href =http://social.technet.microsoft.com/wiki/contents/articles/17946.cascading-comboboxes-in-wpf-using-mvvm.aspx\"target =_ blanktitle =New Window> ^ ]
ComboBox1
<ComboBox Grid.Column="1" Grid.Row="1" Height="23" HorizontalAlignment="Center" Margin="2,2,0,0" Name="comboBoxServer" VerticalAlignment="Top" Width="156" ItemsSource="{Binding ServerNameList}" SelectedValuePath="key" SelectedValue="{Binding serverSelected, Mode=OneWayToSource,UpdateSourceTrigger=PropertyChanged}" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding serverCommand}" CommandParameter="{Binding ElementName=comboBoxServer,Path=SelectedItem}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</ComboBox>
ComboBox2
<ComboBox Grid.Column="1" Grid.Row="2" Height="23" HorizontalAlignment="Center" Margin="2,2,0,0" Name="comboBoxDBName" VerticalAlignment="Top" Width="156" ItemsSource="{Binding DBNameList}" SelectionChanged="comboBoxServer_SelectionChanged" SelectedValuePath="Key" SelectedValue="{Binding serverSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ></ComboBox>
ViewModel
List<string> _ServerNameList;
List<string> _DBNameList;
public List<string> ServerNameList
{
get { return _ServerNameList; }
set
{
_ServerNameList = value;
}
}
public List<string> DBNameList
{
get { return _DBNameList; }
set
{
if (_DBNameList != value)
{
_DBNameList = value;
RaisePropertyChanged("DBNameList");
}
}
}
string _serverSelected;
public string serverSelected
{
get { return _serverSelected; }
set
{
if (_serverSelected != value)
{
_serverSelected = value;
RaisePropertyChanged("serverSelected");
}
}
}
public BackUpViewModel()
{
BackUpContext servObj = new BackUpContext();
_ServerNameList = servObj.GetServers();
serverCommand = new RelayCommand(fetchServer);
_DBNameList = servObj.GetDatabases(serverSelected);
}
public RelayCommand serverCommand { get; set; }
public void fetchServer(object server)
{
serverSelected = server.ToString();
}
ModelClass
public List<string> GetServers()
{
XmlDocument doc = new XmlDocument();
doc.Load(@"C:\Users\477340\Desktop\newFile.xml");
XmlNodeList nodes
= doc.SelectNodes("/servers/server");
foreach (XmlNode node in nodes)
{
lstServerName.Add(node.Attributes["name"].InnerText);
}
return lstServerName;
}
public List<string> GetDatabases(string server)
{
XmlDocument doc = new XmlDocument();
doc.Load(@"C:\Users\477340\Desktop\newFile.xml");
XmlNodeList nodes
= doc.SelectNodes("/servers/server");
foreach (XmlNode node in nodes)
{
if (node.Attributes["name"].InnerText == server)
{
XmlNodeList databases = node.SelectNodes("database");
foreach (XmlNode db in databases)
{
lstDBName.Add(db.InnerText);
}
}
}
return lstDBName;
} 解决方案
Try these links -
Cascading Dropdown & Multiselect Option in ListBox Using WPF[^]
http://social.technet.microsoft.com/wiki/contents/articles/17946.cascading-comboboxes-in-wpf-using-mvvm.aspx[^]
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