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關(guān)于WPF使用MultiConverter控制Button狀態(tài)的詳細(xì)介紹

更新時間：2013年04月18日 10:45:08 作者：

本篇文章小編將為大家介紹，關(guān)于WPF使用MultiConverter控制Button狀態(tài)的詳細(xì)介紹。需要的朋友參考下

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

按鈕XAML

復(fù)制代碼代碼如下:

<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

復(fù)制代碼代碼如下:

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;
        }
      }