關(guān)于WPF使用MultiConverter控制Button狀態(tài)的詳細(xì)介紹_.Net教程
      
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      教程Tag：WPFButton添加
      


      

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      需求描述
      1.按鈕的狀態(tài)需要根據(jù)多個(gè)數(shù)據(jù)源的內(nèi)容作出不同的組合判斷
      2.每個(gè)數(shù)據(jù)源的判斷規(guī)則可定制
      注：以下功能感覺(jué)只是簡(jiǎn)單粗暴的實(shí)現(xiàn)，如果您了解更優(yōu)雅的解決方案，煩請(qǐng)告訴我下，感謝先！
      

      按鈕XAML
      復(fù)制代碼 代碼如下:www.wf0088.com

      <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判斷
      復(fù)制代碼 代碼如下:www.wf0088.com

      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
        }
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      來(lái)源：模板無(wú)憂(yōu)//所屬分類(lèi)：.Net教程/更新時(shí)間：2013-04-22


      


      



      


      



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