雖然由OP一個公認的答案,它採用AutoGenerateColumns="False"
這不正是要求原來的問題。幸運的是,它也可以通過自動生成的列來解決。該解決方案的關鍵是DynamicObject
,可以有靜態和動態特性:
public class MyObject : DynamicObject, ICustomTypeDescriptor {
// The object can have "normal", usual properties if you need them:
public string Property1 { get; set; }
public int Property2 { get; set; }
public MyObject() {
}
public override IEnumerable<string> GetDynamicMemberNames() {
// in addition to the "normal" properties above,
// the object can have some dynamically generated properties
// whose list we return here:
return list_of_dynamic_property_names;
}
public override bool TryGetMember(GetMemberBinder binder, out object result) {
// for each dynamic property, we need to look up the actual value when asked:
if (<binder.Name is a correct name for your dynamic property>) {
result = <whatever data binder.Name means>
return true;
}
else {
result = null;
return false;
}
}
public override bool TrySetMember(SetMemberBinder binder, object value) {
// for each dynamic property, we need to store the actual value when asked:
if (<binder.Name is a correct name for your dynamic property>) {
<whatever storage binder.Name means> = value;
return true;
}
else
return false;
}
public PropertyDescriptorCollection GetProperties() {
// This is where we assemble *all* properties:
var collection = new List<PropertyDescriptor>();
// here, we list all "standard" properties first:
foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(this, true))
collection.Add(property);
// and dynamic ones second:
foreach (string name in GetDynamicMemberNames())
collection.Add(new CustomPropertyDescriptor(name, typeof(property_type), typeof(MyObject)));
return new PropertyDescriptorCollection(collection.ToArray());
}
public PropertyDescriptorCollection GetProperties(Attribute[] attributes) => TypeDescriptor.GetProperties(this, attributes, true);
public AttributeCollection GetAttributes() => TypeDescriptor.GetAttributes(this, true);
public string GetClassName() => TypeDescriptor.GetClassName(this, true);
public string GetComponentName() => TypeDescriptor.GetComponentName(this, true);
public TypeConverter GetConverter() => TypeDescriptor.GetConverter(this, true);
public EventDescriptor GetDefaultEvent() => TypeDescriptor.GetDefaultEvent(this, true);
public PropertyDescriptor GetDefaultProperty() => TypeDescriptor.GetDefaultProperty(this, true);
public object GetEditor(Type editorBaseType) => TypeDescriptor.GetEditor(this, editorBaseType, true);
public EventDescriptorCollection GetEvents() => TypeDescriptor.GetEvents(this, true);
public EventDescriptorCollection GetEvents(Attribute[] attributes) => TypeDescriptor.GetEvents(this, attributes, true);
public object GetPropertyOwner(PropertyDescriptor pd) => this;
}
對於ICustomTypeDescriptor
實現,可以主要使用的TypeDescriptor
靜態函數在一個簡單的方式。 GetProperties()
是需要真正實現的一種:閱讀現有屬性並添加動態屬性。
由於PropertyDescriptor
是抽象的,你要繼承它:從mp3文件中的標記來
public class CustomPropertyDescriptor : PropertyDescriptor {
private Type componentType;
public CustomPropertyDescriptor(string propertyName, Type componentType)
: base(propertyName, new Attribute[] { }) {
this.componentType = componentType;
}
public CustomPropertyDescriptor(string propertyName, Type componentType, Attribute[] attrs)
: base(propertyName, attrs) {
this.componentType = componentType;
}
public override bool IsReadOnly => false;
public override Type ComponentType => componentType;
public override Type PropertyType => typeof(property_type);
public override bool CanResetValue(object component) => true;
public override void ResetValue(object component) => SetValue(component, null);
public override bool ShouldSerializeValue(object component) => true;
public override object GetValue(object component) {
return ...;
}
public override void SetValue(object component, object value) {
...
}
這很好,但是你什麼時候執行這段代碼?當您在DataContextChanged上處理這個時,ItemsSource尚未設置 – Wouter 2011-09-28 09:57:30
在我的實例中,ItemSource綁定到名爲Results的ViewModel屬性。我在視圖中有一個INotifyPrpertyChanged處理程序,對該屬性進行更改。 – dkackman 2011-09-28 23:15:29
這是我的問題,但我偶然發現了一個問題。行驗證呢?您是否必須處理ExpandoObjects上的行驗證? – Ninglin 2015-11-19 15:25:15