子字符串绑定字符串 [英] Substring a bound String
问题描述
我想要的是将字符串绑定到文本块或数据触发器(基本上是一些 WPF 对象)并获取字符串的一部分.该字符串将被分隔.所以,例如,我有这个字符串:
What I want is to bind a string to a textblock or datatrigger (basically some WPF object) and take a part of the string. This string will be delimited. So, for example, I have this string:
String values = "value1|value2";
我有两个控件 - txtBlock1
和 txtBlock2
.
And I have two controls - txtBlock1
and txtBlock2
.
在 txtBlock1 中,我想设置 Text 属性,如 Text={Binding values}
.在 txtBlock2 中,我想设置 Text 属性,如 Text={Binding values}
.
In txtBlock1 I would like to set the Text property like Text={Binding values}
.
In txtBlock2 I would like to set the Text property like Text={Binding values}
.
显然这将显示相同的字符串,所以我需要某种 StringFormat 表达式来添加到此绑定到子字符串值,以便 txtBlock1
读取 value1 和 txtBlock2
读取 value2.
Obviously this will display the same string so I need some sort of StringFormat expression to add to this binding to substring values so that txtBlock1
reads value1 and txtBlock2
reads value2.
我读过很多关于它的内容,看起来是这样的:Wpf Binding Stringformat to show only first character 是典型的建议解决方案.但对于我在这里尝试实现的目标来说,这似乎非常冗长.
I've had a good read about and it seems like this: Wpf Binding Stringformat to show only first character is the typical proposed solution. But it seems awfully long-winded for what I'm trying to achieve here.
非常感谢您提前提供帮助.
Thanks a lot for any help in advance.
推荐答案
这里你需要的是一个转换器.添加一个转换器参数来指示索引.
What you need here is a converter. Add a converter parameter to indicate the index.
public class DelimiterConverter : IValueConverter
{
public object Convert(Object value, Type targetType, object parameter, CultureInfo culture)
{
string[] values = ((string)value).Split("|");
int index = int.Parse((string)parameter);
return values[index];
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return "";
}
然后您只需使用 ConverterParameter 属性指定 XAML 中值的索引.
Then you just specify the index of the value in XAML with the ConverterParameter attribute.
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