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public class HostTest
{
public string Value{get； set；}
public string Value1 {get ；set ；}
}
public class Test
{
private string _value = null;
public string Value
{
get { return _value; }
set
{
_value = value;
}
}
private string _value1 = null;
public string Value1
{
get { return _value1; }
set
{
_value1 = value;
}
}
}
實現效果是將一個HostTest 對象的兩個屬性綁定到Test的兩個屬性上，然后實現HostTest對應的屬性改變,兩個Test 對象的屬性也自動修改，反之亦然，實現代碼如下：
namespace BindingDemo
{
class Program
{
static void Main(string[] args)
{
var host = new HostTest();
var test = new Test();
var test1 = new Test();
host.AddBinding("Value", new Binding(test, "Value"));
host.AddBinding("Value1", new Binding(test, "Value1"));
host.AddBinding("Value", new Binding(test1, "Value"));
host.AddBinding("Value1", new Binding(test1, "Value1"));
host.Value = "Test1";
host.Value1 = "Test1";
Console.WriteLine(test.Value);//Test1
Console.WriteLine(test.Value1);//Test1
Console.WriteLine(test1.Value);//Test1
Console.WriteLine(test1.Value1);//Test1
test.Value = "Test2";
test.Value1 = "Test2";
Console.WriteLine(host.Value);//Test2
Console.WriteLine(host.Value1);//Test2
Console.WriteLine(test1.Value);//Test2
Console.WriteLine(test1.Value1);//Test2
Console.ReadLine();
}
}
public delegate void OnPropertyChanged(object obj,string name);
public interface INotifier
{
OnPropertyChanged OnPropertyChanged { get; set; }
}
public class Binding
{
public object Host { get; set; }
public string HostProperty { get; set; }
public object Target { get; set; }
public string Property { get; set; }
public Binding(object target, string property)
{
Target = target;
Property = property;
}
internal void UpdateTargetValue(object value)
{
var property = Target.GetType().GetProperty(Property);
property.SetValue(Target, value);
}
internal void UpdateHostValue()
{
var property = Target.GetType().GetProperty(Property);
object value = property.GetValue(Target);
property = Host.GetType().GetProperty(HostProperty);
property.SetValue(Host, value);
}
}
public abstract class BindingHostBase
{
private Dictionary<string, object> _values = new Dictionary<string, object>();
private List<Binding> _bindings = new List<Binding>();
private Dictionary<string, List<Binding>> _bindDict = new Dictionary<string, List<Binding>>();
public void AddBinding(string propertyName, Binding binding)
{
if (!_bindDict.ContainsKey(propertyName))
{
_bindDict.Add(propertyName, new List<Binding>() {});
}
var bindings = _bindDict[propertyName];
if (bindings.Contains(binding))
{
return;
}
bindings.Add(binding);
_bindings.Add(binding);
binding.Host = this;
binding.HostProperty = propertyName;
var notifier = binding.Target as INotifier;
if (notifier.OnPropertyChanged == null)
{
notifier.OnPropertyChanged = (obj, name) =>
{
var bds = _bindings.Where(b => b.Target == obj && b.Property == name).ToList();
if (bds != null)
bds.ForEach(b => b.UpdateHostValue());
};
}
}
public void SetValue(string name, object value)
{
if (_values.ContainsKey(name))
{
bool flag = _values[name] != value;
_values[name] = value;
if(flag)
_bindDict[name].ForEach(b=>b.UpdateTargetValue(value));
}
else
{
_values.Add(name, value);
_bindDict[name].ForEach(b => b.UpdateTargetValue(value));
}
}
public object GetValue(string name)
{
if (_values.ContainsKey(name))
{
return _values[name];
}
return null;
}
}
public class HostTest : BindingHostBase
{
public string Value
{
get { return (string) GetValue(nameof(Value)); }
set { SetValue(nameof(Value), value); }
}
public string Value1
{
get { return (string)GetValue(nameof(Value1)); }
set { SetValue(nameof(Value1), value); }
}
}
public class Test : INotifier
{
private string _value = null;
public string Value
{
get { return _value; }
set
{
_value = value;
RaisePropertyChanged(nameof(Value));
}
}
private string _value1 = null;
public string Value1
{
get { return _value1; }
set
{
_value1 = value;
RaisePropertyChanged(nameof(Value1));
}
}
public OnPropertyChanged OnPropertyChanged { get ; set ; }
public void RaisePropertyChanged(string name)
{
OnPropertyChanged?.Invoke(this, name);
}
}
}
本文版權歸腿腿教學網及原創作者所有，未經授權，謝絕轉載。
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