WPF中多源控制Button的状态

 1         <Button Name="btnOK"
 2                 Grid.Column="2"
 3                 HorizontalAlignment="Left"
 4                 VerticalAlignment="Center"
 5                 Command="{Binding Path=OKCommand}"
 6                 Content="{DynamicResource Common_Button_OK}"
 7                 IsDefault="True"
 8                 Style="{DynamicResource ButtonStyle}">
 9           <Button.IsEnabled>
10             <MultiBinding Converter="{StaticResource InvalidMultiValidationRuleToBooleanMultiConverter}" 
11               ConverterParameter="objectnull|greaterthanzerointeger|greaterthanzerointeger|greaterthanzerointeger">
12               <Binding ElementName="comboBoxFilter"
13                        Mode="OneWay"
14                        Path="SelectedItem" />
15               <Binding ElementName="textBoxFrameRate"
16                        Mode="OneWay"
17                        Path="Text" />
18               <Binding ElementName="textBoxSizeWidth"
19                        Mode="OneWay"
20                        Path="Text" />
21               <Binding ElementName="textBoxSizeHeight"
22                        Mode="OneWay"
23                        Path="Text" />
24             </MultiBinding>
25           </Button.IsEnabled>
26         </Button>

  public class InvalidMultiValidationRuleToBooleanMultiConverter : IMultiValueConverter
  {
    #region IMultiValueConverter Members

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
      string[] paramlist = ((string)parameter).Split('|');
      if (paramlist == null || paramlist.Length <= 0)
      {
        throw new ArgumentNullException("parameter");
      }
      int length = paramlist.Length;

      IList<bool> boollist = new List<bool>();

      for (int i = 0; i < paramlist.Length; i++)
      {
        switch (paramlist[i].ToLowerInvariant())
        {
          case "checknameexisted":
            boollist.Add(ValidationRuleHelper.Validate<InvalidCheckNameExistedValidationRule>(values[i]));
            break;
          case "directoryandfileexist":
            boollist.Add(ValidationRuleHelper.Validate<InvalidDirectoryAndFileExistValidationRule>(values[i]));
            break;
          case "greaterthanzerointeger":
            boollist.Add(ValidationRuleHelper.Validate<InvalidGreaterThanZeroIntegerValidationRule>(values[i]));
            break;
          case "numericnull":
            boollist.Add(ValidationRuleHelper.Validate<InvalidNumericNullValidationRule>(values[i]));
            break;
          case "stringlength":
            boollist.Add(ValidationRuleHelper.Validate<InvalidStringLengthValidationRule>(values[i]));
            break;
          case "stringnullorempty":
            boollist.Add(ValidationRuleHelper.Validate<InvalidStringNullOrEmptyValidationRule>(values[i]));
            break;
          case "ipaddress":
            boollist.Add(ValidationRuleHelper.Validate<InvalidIPAddressValidationRule>(values[i]));
            break;
          case "objectnull":
          default:
            boollist.Add(ValidationRuleHelper.Validate<InvalidObjectNullValidationRule>(values[i]));
            break;
        }
      }

      bool result = boollist[0];
      for (int i = 1; i < boollist.Count; i++)
      {
        result = result & boollist[i];
      }

      return result;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
      return null;
    }

    #endregion
  }