Iteration of a selectedItemCollection

本文关键字：selectedItemCollection of Iteration | 更新日期: 2023-09-27 18:04:28

我有一个selectedItemCollection保存在一个对象中，该对象保存有关我从绑定数据网格中选择的选定行的信息。

我试图使用所选数据区内持有的信息，但我无法使其工作。

我已经尝试了下面的代码，但是没有运气，有没有一种简单的方法来迭代保存这些信息的对象?

一如既往地感谢您的帮助。

    public void createRpt(string reportNum, Object selectedItems)
    {
        //Find the information held within selectedItems and do something with it.
        foreach(var item in selectedItems as ItemCollection)  //This returns a 'null exeption on itemCollection' error.
        {
          //Do something with items
        }
    }

Iteration of a selectedItemCollection

转换为IList应该为您工作:

public void createRpt(string reportNum, Object selectedItems)
{
    var items = (System.Collections.IList)selectedItems;
    //var typedItems = items.Cast<YourCustomType>();
    foreach(var item in items)
    {
      //Do something with items
    }
}

要检查为什么会出现这个错误以及它是从哪里来的，您可以将方法更改为下面并调试它:

public void createRpt(string reportNum, Object selectedItems)
{
    //Add debugging code
    var itemCollection = selectedItems as ItemCollection;
    if(itemCollection == null)
    {
        Debug.WriteLine("selectedItems can not be casted to ItemCollection, or not initialized.");
        return;
    }
    if(itemCollection.Count <= 0)
    {
        Debug.WriteLine("Collection is empty");
        return;
    }
    //Find the information held within selectedItems and do something with it.
    foreach(var item in itemCollection) 
    {
      //Do something with items
    }
}