WPF如何使用MultiConverter控制Button狀態

這篇文章主要為大家展示了“WPF如何使用MultiConverter控制Button狀態”，內容簡而易懂，條理清晰，希望能夠幫助大家解決疑惑，下面讓小編帶領大家一起研究并學習一下“WPF如何使用MultiConverter控制Button狀態”這篇文章吧。

需求描述
1.按鈕的狀態需要根據多個數據源的內容作出不同的組合判斷
2.每個數據源的判斷規則可定制
注：以下功能感覺只是簡單粗暴的實現，如果您了解更優雅的解決方案，煩請告訴我下，感謝先！

按鈕XAML

 代碼如下:

<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判斷

代碼如下:

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
  }

以上是“WPF如何使用MultiConverter控制Button狀態”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！