当另一个组合框选择发生更改时，如何使用触发器执行Combobox选择chage [英] How to perform Combobox selection chage using triggers when another combobox selection change occures

问题描述

我在选择第一个组合框时有两个相似的组合框，然后第二个组合框想要被相同的选择。我喜欢在xaml中使用触发器

I have two similar comboboxs when selecting the first combobox then the second combobox want to get selected by the same. I like to use triggers in xaml

推荐答案

查看模型c＃代码：

VIEW MODEL c# CODE :

public class AddressViewModel: INotifyPropertyChanged
   {
       private int mStreetNumber;
       public int StreetNumber {
           get
           {
               return mStreetNumber;
           }

           set
           {
               if (mStreetNumber != value)
               {
                   mStreetNumber = value;

                   // Look up street name
                   Web.AddressBookContext ctx = new Web.AddressBookContext();
                   InvokeOperation<IEnumerable<string>> op = ctx.GetStreetNames(mStreetNumber, this.GetStreetNamesCompleted, null);
               }
           }
       }

       public string StreetName { get; set; }

       private IEnumerable<string> mStreetNames;
       public IEnumerable<string> StreetNames
       {
           get
           {
               return mStreetNames;
           }
       }

       void GetStreetNamesCompleted(InvokeOperation<IEnumerable<string>> op)
       {
           mStreetNames = op.Value;
           if (PropertyChanged != null)
               PropertyChanged(this, new PropertyChangedEventArgs("StreetNames"));
       }

       public event PropertyChangedEventHandler PropertyChanged;

/ *将ViewModel绑定到XAML * /



< usercontrol x：class =StreetLookup.MainPagexmlns：x =＃unknown>

xmlns =http://schemas.microsoft.com/winfx/2006/ xaml / presentation

xmlns：x =http://schemas.microsoft.com/winfx/2006/xaml

xmlns：d =http：// schemas.microsoft.com/expression/blend/2008

xmlns：mc =http://schemas.openxmlformats.org/markup-compatibility/2006

mc ：Ignorable =d

d：DesignHeight =300d：DesignWidth =400

xmlns：sdk =http://schemas.microsoft.com/ winfx / 2006 / xaml / presentation / sdk

Loaded =UserControl_Loaded

>



< grid x：name =LayoutRootbackground =White>

< sdk：label height =27horizo​​ntalalignment =Leftmargin =23,34,0,0name =label1verticalalignment =Topwidth =76content =数字xmlns：sdk =＃unknown>

< sdk：label height =28horizo​​ntalalignment =Leftmargin =178,34,0,0name =label2verticalalignment =Topwidth =120content =街道xmlns：sdk =＃unknown>

< textbox height =23horizo​​ntalalignment =Leftmargin =23,67,0,0name =textBox1verticalalignment =Topwidth =120text = {Binding StreetNumber，Mode = TwoWay}>

< combobox height =23>

SelectedValue ={Binding StreetName，Mode = TwoWay}

ItemsSource ={绑定StreetNames，Mode = OneWay}

Horizo​​ntalAlignment =LeftMargin =179,66,0,0Name =comboBox1VerticalAlignment =TopWidth =162
/>







C＃

private void UserControl_Loaded（object sender，RoutedEventArgs e ）

{

this.DataContext = vm;

}



网络服务



amespace StreetLookup.Web

{

使用System.Collections.Generic;

使用System.ServiceModel.DomainServices.Hosting;

使用System.ServiceModel.DomainServices.Server;





// TODO：创建包含应用程序逻辑的方法。

[EnableClientAccess（）]

公共类AddressBookService：DomainService

{

[Invoke]

public IEnumerable< string> GetStreetNames（int StreetNumber）

{

List< string> names = new List< string>（）;

if（StreetNumber == 1）

{

names.Add（Parker St）;

names.Add（Zachary St）;

}



if（StreetNumber == 2）

{

名字.Add（Market St）;

names.Add（Ocean Ave）;

}



返回姓名;

}

}

}



问候，

Praveen Nelge

/*Binding the ViewModel to the XAML*/

<usercontrol x:class="StreetLookup.MainPage" xmlns:x="#unknown">
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
Loaded="UserControl_Loaded"
>

<grid x:name="LayoutRoot" background="White">
<sdk:label height="27" horizontalalignment="Left" margin="23,34,0,0" name="label1" verticalalignment="Top" width="76" content="Number" xmlns:sdk="#unknown">
<sdk:label height="28" horizontalalignment="Left" margin="178,34,0,0" name="label2" verticalalignment="Top" width="120" content="Street" xmlns:sdk="#unknown">
<textbox height="23" horizontalalignment="Left" margin="23,67,0,0" name="textBox1" verticalalignment="Top" width="120" text="{Binding StreetNumber,Mode=TwoWay}">
<combobox height="23">
SelectedValue="{Binding StreetName, Mode=TwoWay}"
ItemsSource="{Binding StreetNames,Mode=OneWay}"
HorizontalAlignment="Left" Margin="179,66,0,0" Name="comboBox1" VerticalAlignment="Top" Width="162"
/>



C#
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
this.DataContext = vm;
}

Web Service

amespace StreetLookup.Web
{
using System.Collections.Generic;
using System.ServiceModel.DomainServices.Hosting;
using System.ServiceModel.DomainServices.Server;


// TODO: Create methods containing your application logic.
[EnableClientAccess()]
public class AddressBookService : DomainService
{
[Invoke]
public IEnumerable<string> GetStreetNames(int StreetNumber)
{
List<string> names = new List<string>();
if (StreetNumber == 1)
{
names.Add("Parker St");
names.Add("Zachary St");
}

if (StreetNumber == 2)
{
names.Add("Market St");
names.Add("Ocean Ave");
}

return names;
}
}
}

Regards,
Praveen Nelge

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