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 复制代码 代码如下: <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判断 复制代码 代码如下: 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 }
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