关于WPF使用MultiConverter控制Button状态的详细介绍


            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复制代码 代码如下:<Button Name="btnOK"                 Grid.Column="2"                 HorizontalAlignment="Left"                 VerticalAlignment="Center"                 Command="{Binding Path=OKCommand}"                 Content="{DynamicResource Common_Button_OK}"                 IsDefault="True"                 Style="{DynamicResource ButtonStyle}">           <Button.IsEnabled>             <MultiBinding Converter="{StaticResource InvalidMultiValidationRuleToBooleanMultiConverter}"                ConverterParameter="objectnull|greaterthanzerointeger|greaterthanzerointeger|greaterthanzerointeger">               <Binding ElementName="comboBoxFilter"                        Mode="OneWay"                        Path="SelectedItem" />               <Binding ElementName="textBoxFrameRate"                        Mode="OneWay"                        Path="Text" />               <Binding ElementName="textBoxSizeWidth"                        Mode="OneWay"                        Path="Text" />               <Binding ElementName="textBoxSizeHeight"                        Mode="OneWay"                        Path="Text" />             </MultiBinding>           </Button.IsEnabled>         </Button>MultiConverter判断复制代码 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<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  }