Do not just seek happiness for yourself.Seek happiness for all.Through kindness.Through mercy.
附加属性
附加属性是可以用于多个控件,但是在另一个类中定义的属性.附加属性的命名方式是”定义类型.属性”.这样可以让Xaml解析器将其与普通属性区分开.附加属性的设置可以使用Attribute和Property-Element语法.使用后者时类型必须是包含该属性的类型.
Content属性
类型转换器
所有的类型转换器都派生自TypeConverter,TypeConverter提供的4个重要方法是CanConvertTo,CanConvertFrom,ConvertTo和ConvertFrom.
ConvertFrom方法将Xaml中的字符串转换为相应的CLR对象.ConvertTo方法将CLR对象转换为相应的字符串.CanConvertFrom用来检查能否从字符串转换为相应的CLR对象.CanConvertTo检查ClR对象能否转换为相应的字符串.可以true.
自定义类型转换器
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| [TypeConverter(typeof(MoneyConverter))]
public class MoneyType
{
private string _value;
public MoneyType()
{
_value = "0";
}
public MoneyType(string value)
{
_value = value;
}
public override string ToString()
{
return _value.ToString();
}
public static MoneyType Parse(string value) {
string str = (value as string).Trim();
if (str[0] == '$') {
string newprice = str.Remove(0,1);
double price = double.Parse(newprice);
return new MoneyType("￥" + (price * 7.24).ToString("0.00"));
}
else if (str[0] == '￥')
{
string newprice = str.Remove(0, 1);
double price = double.Parse(newprice);
return new MoneyType("$" + (price / 7.24).ToString("0.00"));
}else
{
double price = double.Parse(str);
return new MoneyType(""+price);
}
}
}
public class MoneyConverter : TypeConverter
{
/// <summary>
/// 对象转换为Xaml字符串是否
/// </summary>
/// <param name="context"></param>
/// <param name="sourceType"></param>
/// <returns></returns>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if(sourceType==typeof(string))
return true;
return base.CanConvertFrom(context, sourceType);
}
/// <summary>
/// Xaml上下文转换为对应类型
/// </summary>
/// <param name="context"></param>
/// <param name="destinationType"></param>
/// <returns></returns>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(string))
return true;
return base.CanConvertTo(context, destinationType);
}
/// <summary>
/// 将Xaml上下文转换为对象
/// </summary>
/// <param name="context"></param>
/// <param name="culture"></param>
/// <param name="value"></param>
/// <returns></returns>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value.GetType()!=typeof(string))
{
return base.ConvertFrom(context, culture, value);
}
return MoneyType.Parse((string)value);
}
/// <summary>
/// 将对象转为Xaml上下文
/// </summary>
/// <param name="context"></param>
/// <param name="culture"></param>
/// <param name="value"></param>
/// <param name="destinationType"></param>
/// <returns></returns>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if(destinationType==typeof(string))
return base.ConvertTo(context, culture, value, destinationType);
return value.ToString();
}
}
|
标记扩展
{x:null}表示一个空值 {x:static}代表引用一个类的静态变量 {}{HelloXaml}表示普通字符串