需求描述
1.按钮的状态需要根据多个数据源的内容作出不同的组合判断
2.每个数据源的判断规则可定制
注：以下功能感觉只是简单粗暴的实现，如果您了解更优雅的解决方案，烦请告诉我下，感谢先！

按钮XAML

 代码如下:

                 Grid.Column="2"
                 HorizontalAlignment="Left"
                 VerticalAlignment="Center"
                 Command="{Binding Path=OKCommand}"
                 Content="{DynamicResource Common_Button_OK}"
                 IsDefault="True"
                 Style="{DynamicResource ButtonStyle}">
          
                            ConverterParameter="objectnull|greaterthanzerointeger|greaterthanzerointeger|greaterthanzerointeger">
                                       Mode="OneWay"
                        Path="SelectedItem" />
                                       Mode="OneWay"
                        Path="Text" />
                                       Mode="OneWay"
                        Path="Text" />
                                       Mode="OneWay"
                        Path="Text" />
            
          
        

MultiConverter判断

代码如下:

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 boollist = new List();

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