我如何組合框與數據集綁定在WPF

Question

要綁定與數據集的組合和組合作爲參數取值來填充 另一個組合在WPF

Answer 1

這應該讓你開始。 Window_Loaded事件用幾行設置一個DataTable，並設置ComboBox的DataContext和DisplayMemberPath。 Countries_SelectionChanged事件抓取SelectedItem（如果有），並重置Cities.ItemsSource屬性作爲方法調用的結果，該方法調用返回IEnumerable<string>。這個調用可以是任何你想要的（數據庫調用，文件操作等）。希望這可以幫助！

<UniformGrid Rows="2" Columns="2"> 
    <Label Content="Countries" VerticalAlignment="Center"/> 
    <ComboBox Name="Countries" VerticalAlignment="Center" SelectionChanged="Countries_SelectionChanged" ItemsSource="{Binding}"/> 
    <Label Content="Cities" VerticalAlignment="Center"/> 
    <ComboBox Name="Cities" VerticalAlignment="Center"/> 
</UniformGrid> 

private void Window_Loaded(object sender, RoutedEventArgs e) { 
    DataTable dt = new DataTable(); 
    dt.Columns.Add("Country", typeof(string)); 

    DataRow firstRow = dt.NewRow(); 
    DataRow secondRow = dt.NewRow(); 
    firstRow["Country"] = "USA"; 
    secondRow["Country"] = "Italy"; 
    dt.Rows.Add(firstRow); 
    dt.Rows.Add(secondRow); 

    Countries.DisplayMemberPath = "Country"; 
    Countries.DataContext = dt; 
} 

private void Countries_SelectionChanged(object sender, SelectionChangedEventArgs e) { 
    DataRowView dr = Countries.SelectedItem as DataRowView; 
    if (dr != null) { 
     Cities.ItemsSource = null; 
     Cities.ItemsSource = GetCities(dr["Country"].ToString()); 
    } 
} 

private IEnumerable<string> GetCities(string country) { 
    if (country == "USA") 
     return new []{ "New York", "Chicago", "Los Angeles", "Dallas", "Denver" }; 
    if (country == "Italy") 
     return new[] { "Rome", "Venice", "Florence", "Pompeii", "Naples" }; 
    return new[] { "" }; 
}