如何处理类型"Object {System.Collections.Generic.List< object>}" [英] How to handle type “Object {System.Collections.Generic.List<object>}”

问题描述

这是我第一次遇到这样的物体.

This is my first time encountering with such an object.

>调试期间我的本地窗口的图像链接<

因此，很简单地说，当唯一的"test"给出的方法与普通对象完全相同，并且我不知道要强制转换时，如何访问CardNO或ItemID的值，分别为296和130.它来.我什至不能做这个'test [0]'.

So to put it very simply, how do I access the value for CardNO or ItemID, which is 296 and 130 respectively when the only methods 'test' give are exactly like a normal object and I don't know what to cast it to. I can't even do this 'test[0]'.

这是测试"的来源:

private void ListBoxIssue_OnDragEnter(object sender, DragEventArgs e)
    {
        var test = DragDropPayloadManager.GetDataFromObject(e.Data, typeof(CommsItem));
    }

推荐答案

使用

var item = (CommsItem)((List<object>)test).FirstOrDefault();

在转换之前，请务必先检查 test 是否为 List< object> 的实例，以及test [0]是否为CommsItem的实例.

Be sure to check first if test is an instance of List<object> before casting, and if test[0] is an instance of CommsItem.

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