/// <summary> /// 根据SelectedValuePath指定的值,获取目标属性值 /// </summary> /// <param name="entity"></param> /// <returns></returns> public static object GetSelectedValue(this SelectionViewMeta rvi, Entity entity) { var selectedValuePath = rvi.SelectedValuePath ?? Entity.IdProperty; //如果是一个引用属性,则返回引用属性的 Id var refProperty = selectedValuePath as IRefProperty; if (refProperty != null) { var meta = refProperty.GetMeta(entity); return(refProperty.Nullable ? entity.GetRefNullableId(refProperty.RefIdProperty) : entity.GetRefId(refProperty.RefIdProperty)); } return(entity.GetProperty(selectedValuePath)); }
/// <summary> /// 多选模式下的写值操作 /// </summary> /// <param name="curEntity">正在编辑的实体。</param> /// <param name="svm">选择视图模型</param> /// <param name="selectedEntities">当前被选择的实体</param> private SetSelectionResult SyncSelectionToValue_Multiple(Entity curEntity, SelectionViewMeta rvm, IList <Entity> selectedEntities) { var result = string.Join(rvm.SplitterIfMulti, selectedEntities.Select(i => this.GetSelectedValue(i))); //赋值给this.PropertyValue this.PropertyValue = result; SetSelectionResult res = (this.PropertyValue as string) == result ? SetSelectionResult.Success : SetSelectionResult.Cancel; if (res == SetSelectionResult.Success) { //此时这个属性应该是一个 int 数组类型 if (rvm.RefIdHost != null) { var idArray = selectedEntities.Select(i => i.Id).ToArray(); curEntity.SetProperty(rvm.RefIdHost, idArray, ManagedPropertyChangedSource.FromUIOperating); } } return(res); }
/// <summary> /// 单选模式下的写值操作 /// </summary> /// <param name="curEntity">正在编辑的实体。</param> /// <param name="svm">选择视图模型</param> /// <param name="selectedEntities">当前被选择的实体</param> private SetSelectionResult SyncSelectionToValue_Single(Entity curEntity, SelectionViewMeta svm, IList <Entity> selectedEntities) { bool success = false; //引用属性,应该先尝试设置实体属性,再设置 Id 属性。 var rp = this.Meta.PropertyMeta.ManagedProperty as IRefProperty; if (selectedEntities.Count > 0) { var selectedEntity = selectedEntities[0] as Entity; if (rp != null) { //如果 SelectedValuePath 是一个引用属性,或者直接就是一个实体属性, //则应该获取相应的实体的值。 var valuePath = svm.SelectedValuePath; if (valuePath != null) { if (valuePath is IRefProperty) { selectedEntity = selectedEntity.GetRefEntity((valuePath as IRefProperty).RefEntityProperty); } else if (rp.RefEntityType.IsAssignableFrom(valuePath.PropertyType)) { selectedEntity = this.GetSelectedValue(selectedEntity) as Entity; } } //设置实体到本引用属性上。 this.OnReferenceEntityChanging(); curEntity.SetRefEntity(rp.RefEntityProperty, selectedEntity, ManagedPropertyChangedSource.FromUIOperating); success = curEntity.GetRefEntity(rp.RefEntityProperty) == selectedEntity; if (success) { this.OnReferenceEntityChanged(); } } else { var value = this.GetSelectedValue(selectedEntity); this.PropertyValue = value; success = this.PropertyValue == value; if (success && svm.RefIdHost != null) { curEntity.SetProperty(svm.RefIdHost, selectedEntity.Id, ManagedPropertyChangedSource.FromUIOperating); } } } else { if (rp != null) { this.OnReferenceEntityChanging(); curEntity.SetRefEntity(rp.RefEntityProperty, null, ManagedPropertyChangedSource.FromUIOperating); success = curEntity.GetRefEntity(rp.RefEntityProperty) == null; if (success) { this.OnReferenceEntityChanged(); } } else { this.PropertyValue = null; success = this.PropertyValue == null; if (success && svm.RefIdHost != null) { curEntity.SetProperty(svm.RefIdHost, null, ManagedPropertyChangedSource.FromUIOperating); } } } return(success ? SetSelectionResult.Success : SetSelectionResult.Cancel); }