Question

使用MVVM（没有代码隐藏），我想在选择时隐藏我的DataGrid列，我有以下代码：

<DataGrid ItemsSource="{Binding SSID}" Grid.Row="1"  Margin="10,10,0,0" Height="200" Width="500" Grid.ColumnSpan="2" Name="dg" HorizontalAlignment="Left" AutoGenerateColumns="False">
    <DataGrid.Columns>
      <DataGridTextColumn Header="Network ID" Binding="{Binding _networkID}"></DataGridTextColumn>
      <DataGridTextColumn Header="SSID" Binding="{Binding _ssid}"></DataGridTextColumn>
      <DataGridTextColumn Header="VLAN" Binding="{Binding _vlan}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _authenticationMode}" Binding="{Binding _authenticationMode}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _authentication}" Binding="{Binding _authentication}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _staticWEPKeyType}" Binding="{Binding _staticWEPKeyType}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _staticWEPKeyLength}" Binding="{Binding _staticWEPKeyLength}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _staticWEPKey1}" Binding="{Binding _staticWEPKey1}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _staticWEPKey2}" Binding="{Binding _staticWEPKey2}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _staticWEPKey3}" Binding="{Binding _staticWEPKey3}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _staticWEPKey4}" Binding="{Binding _staticWEPKey4}"></DataGridTextColumn>
      <DataGridTextColumn Visibility="{Binding _wpaPersonalKeyAC}" Binding="{Binding _wpaPersonalKeyAC}"></DataGridTextColumn>
   </DataGrid.Columns>
</DataGrid>

C＃代码是：

var ssid = new SSIDPropertyClass();

ssid._networkID = SSID.Count + 1;
ssid._ssid = EnteredSSIDAC;
ssid._vlan = VlanSSID;

if (ACSelectedSecurityType=="Static WEP")
{
    ssid._authenticationMode = ACSelectedSecurityType;
    ssid._authentication = ACStaticWEPSelectedAuthentication;

    ssid._staticWEPKeyType = ACStaticWEPSelectedKeyType;
    ssid._staticWEPKeyLength = ACStaticWEPSelectedKeyLength;

    ssid._staticWEPKey1 = StaticWEPKey1;
    ssid._staticWEPKey2 = StaticWEPKey2;
    ssid._staticWEPKey3 = StaticWEPKey3;
    ssid._staticWEPKey4 = StaticWEPKey4;

    SSID.Add(ssid);
}
else if(ACSelectedSecurityType=="WPA/WPA2 Personal")
{
    ssid._authenticationMode = ACSelectedSecurityType;
    ssid._wpaPersonalKeyAC = WpaACKey;

    SSID.Add(ssid);
}

我希望当执行块时，它只会在datagrid中添加块列，而在块中添加其他其他块的情况。实际上，它总是显示我不需要的额外列，例如当{{1执行我想只显示我在SSID集合中添加的两个，但是它也显示了阻塞列。所以简而言之我想让额外列的可见性为false。任何人都可以解决我的问题，因为我需要明天提交。任何帮助都会非常明显吗？

Answer 1

如果要隐藏列，则需要像这样指定属性Visibility，

YourDataGrid.Columns[IndexOftheColumn].Visibility = Visibility.Collapsed;

如果要隐藏第一列，请说“网络ID”

dg.Columns[0].Visibility = Visibility.Collapsed;

Answer 2

对于那些希望在XAML中隐藏它的人

它看起来像这样：

<DataGridTextColumn Visibility="Collapsed" Header="Merchant Reference" Binding="{Binding MerchantReference}"                                    Width="200" />

Answer 3

您不必隐藏列，只需将其MaxWidth属性设置为零，它就不会出现。

        DataGrid.Columns[IndexOfColumn].MaxWidth = 0;

Answer 4

在MVVM中，这通常是通过ValueConverter处理的

public sealed class BoolToVisibilityConverter : IValueConverter
{
   public Visibility TrueValue { get; set; }
   public Visibility FalseValue { get; set; }

   public BoolToVisibilityConverter()
   {
      // Set defaults
      this.TrueValue = Visibility.Visible;
      this.FalseValue = Visibility.Collapsed;
   }

   public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
   {
       bool flag = false;
       if (value is bool)
       {
          flag = (bool)value;
       }
       else if (value is bool?)
       {
          bool? nullable = (bool?)value;
          flag = nullable.HasValue ? nullable.Value : false;
      }
      return flag ? this.TrueValue : this.FalseValue;
  }

  public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  {
      if (object.Equals(value, this.TrueValue))
          return true;
      if (object.Equals(value, this.FalseValue))
        return false;
      return null;
  }
}

在资源部分添加

<ResourceDictionary>
   <namspace:BoolToVisibilityConverter x:Key="BoolToCollapsed" TrueValue="Visible" FalseValue="Collapsed" />
</ResourceDictionary>

在您的数据网格上

 <DataGrid ItemsSource="{Binding Items}" >
    <DataGrid.Columns>
      <DataGridTextColumn Visibility="{Binding ShowThisColumnFlag, Converter={StaticResource BoolToCollapsed}}" Binding="{Binding PropertyOne}" />

      <DataGridTextColumn Visibility="{Binding ShowAnotherColumnFlag, Converter={StaticResource BoolToCollapsed}}" Binding="{Binding PropertyTwo}"/>
    </DataGrid.Columns>
 </DataGrid>

您应该根据需要设置模式。

如何使用MVVM自动隐藏WPF中的DataGrid列？

4 个答案: