WPF XAML組合框綁定到整數數據

Question

我具有包括性別列作爲int（1 =男，2 =女）的數據庫表。

我希望在與柱結合，但顯示了男性和女性的XAML申報ComboBox。

什麼是每個ComboBoxItem以價值相當的？

<ComboBox SelectedValue="{Binding Gender, Mode=TwoWay}"> 
    <ComboBoxItem Content="Male" value=1 /> 
    <ComboBoxItem Content="Female" value=2 /> 
</ComboBox> 

Answer 1

有幾種方法可以實現你想要的。這裏有一對夫婦。選擇適合你的。

1.使用值轉換器

設置您的組合框是這樣的：

<ComboBox 
    ItemsSource="{Binding Genders}" 
    SelectedItem="{Binding Gender, Converter={x:Static local:GenderConverter.Instance}}" /> 

在視圖模型：

// Hook up to your data however you want 
public int Gender 
{ 
    get { return _gender; } 
    set 
    { 
     if (_gender != value) 
     { 
      _gender = value; 
      OnPropertyChanged(); 
     } 
    } 
} 
private int _gender; 

// Initialize to ["Male", "Female"] 
public string[] Genders { get; private set; } 

和轉換器：

internal class GenderConverter : IValueConverter 
{ 
    public static GenderConverter Instance { get; private set; } 

    static GenderConverter() 
    { 
     Instance = new GenderConverter(); 
    } 

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     if (value is int) 
     { 
      switch ((int)value) 
      { 
       case 1: return "Male"; 
       case 2: return "Female"; 
      } 
     } 
     return null; 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     if (value is string) 
     { 
      string gender = (string)value; 
      if (string.Compare(gender, "Male", true) == 0) return 1; 
      if (string.Compare(gender, "Female", true) == 0) return 2; 
     } 
     return null; 
    } 
} 

2.轉換成視圖模型

值設置您的組合框是這樣的：

<ComboBox 
    ItemsSource="{Binding Genders}" 
    SelectedItem="{Binding Gender}" /> 

在視圖模型：

// Hook up to your data however you want 
public string Gender 
{ 
    get 
    { 
     switch(_gender) 
     { 
      case 1: return "Male"; 
      case 2: return "Female"; 
      default: return null; 
     } 
    } 
    set 
    { 
     int actualValue = 0; 
     if (string.Compare(value, "Male", true) == 0) actualValue = 1; 
     if (string.Compare(value, "Female", true) == 0) actualValue = 2; 
     if (_gender != actualValue) 
     { 
      _gender = actualValue; 
      OnPropertyChanged(); 
     } 
    } 
} 
private int _gender; 

// Initialize to ["Male", "Female"] 
public string[] Genders { get; private set; }