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关于WPF使用MultiConverter控制Button状态的详细介绍

发布时间：2023-03-05 08:32:10 来源：互联网

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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


<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


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
 }