Question

我想知道除了这个之外是否有简单明了的方法从嵌套的listview控制器访问主对象。

((PropertyCollectionSource)((ListView)View).CollectionSource).MasterObject

我是否必须在需要访问主对象的任何地方写这个？

我认为这不是一种优雅的方式，看起来很蹩脚。

Answer 1

尚未测试，但您可以使用以下ViewController后代：

public class NestedViewController : ViewController
{
    protected PropertyCollectionSource PropertyCollectionSource
    {
        get
        {
            return View is ListView ? ((ListView)View).CollectionSource is PropertyCollectionSource ? ((ListView)View).CollectionSource as PropertyCollectionSource : null : null;
        }
    }

    protected object MasterObject
    {
        get
        {
            return PropertyCollectionSource != null ? PropertyCollectionSource.MasterObject : null;
        }
    }
}

Answer 2

用C＃6简化上述答案

public partial class NestedViewController : ViewController
{
    protected PropertyCollectionSource PropertyCollectionSource => (View as ListView)?.CollectionSource as PropertyCollectionSource;

    protected object MasterObject => PropertyCollectionSource?.MasterObject;
}

我也把它移到了一个函数

public static class HandyControllerFunctions
{
    public static object GetMasterObject(View view)
    {
        var propertyCollectionSource = (view as ListView)?.CollectionSource as PropertyCollectionSource;
        return propertyCollectionSource?.MasterObject ;
    }
}

并将其称为例如

var myObject = HandyControllerFunctions.GetMasterObject（View）as IMyObject

从XAF上的嵌套列表视图访问主对象的更简单的替代方法

2 个答案: