深入浅出WPF-06.Binding(绑定)03
MultiBinding(多路Binding)
当UI中的显示信息是由源Source中的多个数据来决定时,使用MultiBinding。他和Binding的区别是需要传递多个元数据,针对多个数据源需要使用一个转换机制类决定目标的属性。
转换器代码:
public class ScanTimeConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
string result = string.Empty;
if (values == null) return result;
string strValue = values.ToString();
if (!string.IsNullOrEmpty(strValue) && !strValue.Equals("NaN") && values.Length == 4)
{
try
{
ushort RepeatNum = System.Convert.ToUInt16(values[0]);
ushort FrameNum = System.Convert.ToUInt16(values[1]);
ushort LineNum = System.Convert.ToUInt16(values[2]);
ushort Frequency = System.Convert.ToUInt16(values[3]);
if (Frequency != 0)
result = (RepeatNum * FrameNum * LineNum * 1.0 / Frequency).ToString("F2");//单位:ms
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
return result;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
xaml代码:
<TextBlock Margin="0,0,5,0" Style="{StaticResource TextBlockDefault}">
<TextBlock.Text>
<MultiBinding Converter="{StaticResource ScanTimeConverter}">
<Binding Path="OCTScanParam.RepeatNum" />
<Binding Path="OCTScanParam.FrameNum" />
<Binding Path="OCTScanParam.LineNum" />
<Binding Path="OCTScanParam.Frequency" />
</MultiBinding>
</TextBlock.Text>
</TextBlock>