需求描述
- 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
- 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
1 <Button Name="btnOK" 2 Grid.Column="2" 3 HorizontalAlignment="Left" 4 VerticalAlignment="Center" 5 Command="{Binding Path=OKCommand}" 6 Content="{DynamicResource Common_Button_OK}" 7 IsDefault="True" 8 Style="{DynamicResource ButtonStyle}"> 9 <Button.IsEnabled> 10 <MultiBinding Converter="{StaticResource InvalidMultiValidationRuleToBooleanMultiConverter}" 11 ConverterParameter="objectnull|greaterthanzerointeger|greaterthanzerointeger|greaterthanzerointeger"> 12 <Binding ElementName="comboBoxFilter" 13 Mode="OneWay" 14 Path="SelectedItem" /> 15 <Binding ElementName="textBoxFrameRate" 16 Mode="OneWay" 17 Path="Text" /> 18 <Binding ElementName="textBoxSizeWidth" 19 Mode="OneWay" 20 Path="Text" /> 21 <Binding ElementName="textBoxSizeHeight" 22 Mode="OneWay" 23 Path="Text" /> 24 </MultiBinding> 25 </Button.IsEnabled> 26 </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 }