关于WPF使用MultiConverter控制Button状态的详细介绍_.Net教程

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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

复制代码代码如下:www.mb5u.com

<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:www.mb5u.com

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;
}
}