绑定没有克隆方法，是一种有效的复制方法

我希望复制一个绑定，这是我可以在其上设置不同的源属性而不影响原始绑定。 这只是将新绑定的所有属性设置为与旧的相同的情况吗？

Answer 1

如果你找不到这样做的方法已经为Binding创建了一个exetension。

public static class BindingExtensions { public static Binding Clone(this Binding binding) { var cloned = new Binding(); //copy properties here return cloned; } } public void doWork() { Binding b= new Binding(); Binding nb = b.Clone(); } 

Answer 2

这是我解决问题的方法：

 public static BindingBase CloneBinding(BindingBase bindingBase, object source) { var binding = bindingBase as Binding; if (binding != null) { var result = new Binding { Source = source, AsyncState = binding.AsyncState, BindingGroupName = binding.BindingGroupName, BindsDirectlyToSource = binding.BindsDirectlyToSource, Converter = binding.Converter, ConverterCulture = binding.ConverterCulture, ConverterParameter = binding.ConverterParameter, //ElementName = binding.ElementName, FallbackValue = binding.FallbackValue, IsAsync = binding.IsAsync, Mode = binding.Mode, NotifyOnSourceUpdated = binding.NotifyOnSourceUpdated, NotifyOnTargetUpdated = binding.NotifyOnTargetUpdated, NotifyOnValidationError = binding.NotifyOnValidationError, Path = binding.Path, //RelativeSource = binding.RelativeSource, StringFormat = binding.StringFormat, TargetNullValue = binding.TargetNullValue, UpdateSourceExceptionFilter = binding.UpdateSourceExceptionFilter, UpdateSourceTrigger = binding.UpdateSourceTrigger, ValidatesOnDataErrors = binding.ValidatesOnDataErrors, ValidatesOnExceptions = binding.ValidatesOnExceptions, XPath = binding.XPath, }; foreach (var validationRule in binding.ValidationRules) { result.ValidationRules.Add(validationRule); } return result; } var multiBinding = bindingBase as MultiBinding; if (multiBinding != null) { var result = new MultiBinding { BindingGroupName = multiBinding.BindingGroupName, Converter = multiBinding.Converter, ConverterCulture = multiBinding.ConverterCulture, ConverterParameter = multiBinding.ConverterParameter, FallbackValue = multiBinding.FallbackValue, Mode = multiBinding.Mode, NotifyOnSourceUpdated = multiBinding.NotifyOnSourceUpdated, NotifyOnTargetUpdated = multiBinding.NotifyOnTargetUpdated, NotifyOnValidationError = multiBinding.NotifyOnValidationError, StringFormat = multiBinding.StringFormat, TargetNullValue = multiBinding.TargetNullValue, UpdateSourceExceptionFilter = multiBinding.UpdateSourceExceptionFilter, UpdateSourceTrigger = multiBinding.UpdateSourceTrigger, ValidatesOnDataErrors = multiBinding.ValidatesOnDataErrors, ValidatesOnExceptions = multiBinding.ValidatesOnDataErrors, }; foreach (var validationRule in multiBinding.ValidationRules) { result.ValidationRules.Add(validationRule); } foreach (var childBinding in multiBinding.Bindings) { result.Bindings.Add(CloneBinding(childBinding, source)); } return result; } var priorityBinding = bindingBase as PriorityBinding; if (priorityBinding != null) { var result = new PriorityBinding { BindingGroupName = priorityBinding.BindingGroupName, FallbackValue = priorityBinding.FallbackValue, StringFormat = priorityBinding.StringFormat, TargetNullValue = priorityBinding.TargetNullValue, }; foreach (var childBinding in priorityBinding.Bindings) { result.Bindings.Add(CloneBinding(childBinding, source)); } return result; } throw new NotSupportedException("Failed to clone binding"); } 

Answer 3

我刚刚注意到在BindingBase反编译代码中它有一个内部Clone()方法，所以另一个（不安全，不要在家尝试，使用风险等等）解决方案是使用reflection来绕过编译器的访问限制：

 public static BindingBase CloneBinding(BindingBase bindingBase, BindingMode mode = BindingMode.Default) { var cloneMethodInfo = typeof(BindingBase).GetMethod("Clone", BindingFlags.Instance | BindingFlags.NonPublic); return (BindingBase) cloneMethodInfo.Invoke(bindingBase, new object[] { mode }); } 

但是没试过，所以它可能不起作用。