如何从SelectedItemCollection获取计数 [英] How to get count from a SelectedItemCollection

问题描述

我的viewmodel类在运行时中有一个对象。该obj包含列表框中的SelectedItemCollection。



问题是我可以在调试时获得运行时的计数。

I have an object in the runtime in my viewmodel class. This obj contains SelectedItemCollection from the listbox.

The problem is I can get the count in the run time while debugging.

((SelectedItemCollection)obj).Count

object Details, obj Count = 1   object {System.Windows.Controls.SelectedItemCollection}

但是当我在编译时宣布相同时我收到以下错误。

错误9System.Windows.Controls.SelectedItemCollection由于其保护级别而无法访问D：\Projects \ GMS \ GMSDesktop \Src \Modules \ xxx.Security \ViewModels \ xxxcs 254 52



伙计们，让我知道如何解决这个问题...

先谢谢你。

but when I declared the same in the compile time I am getting the below error.
Error 9 'System.Windows.Controls.SelectedItemCollection' is inaccessible due to its protection level D:\Projects\GMS\GMSDesktop\Src\Modules\xxx.Security\ViewModels\xxx.cs 254 52

Guys, Let me know how can I resolve this...
Thanks in Advance.

推荐答案

在您的viewmodel中，您可以添加一个公共属性，该属性返回selectedItemCollection的计数并使用该属性。

In your viewmodel you could add a public property that returns the count of the selectedItemCollection and use that property instead.

要进行绑定，您需要绑定到财产， d必须公开。如果没有为类指定，则会获得内部。尝试将ViewModel类设置为public，并查看是否仍然有问题。我知道内部类适用于ViewModels。

To do binding you need to bind to a property, and it must be public. When you do not specify for a class, you get internal. Try to make the ViewModel class public and see if that works if still have a problem. I do know that internal classes work for ViewModels.

假设collection参数的元素是MyObjectClass类型：

Assuming that the element of the collection parameter are of type MyObjectClass:

List<MyObjectClass> SelectedItemsList{get;set;}
private void DataGridSelectionChanged(object selectedBackPlaneData)
{
   SelectedItemsList= (selectedBackPlaneData as IList).Cast<MyObjectClass>().ToList();
}

就行了。





你也可以使用通用：

will do the trick.


You could also use a generic:

private IList<t> ConvertListOfSelectedItem<t>(object param)
{
   return (param as IList).Cast<t>().ToList();
}

在这种情况下，代码将是

In which case the code would be

IList<MyObjectClass> SelectedItemsList{get;set;}

private void DataGridSelectionChanged(object stuff)
{
   SelectedItemsList= ConvertListOfSelectedItem<MyObjectClass>(stuff);
}

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