无法从绑定到 LINQ 的 CheckedListBoxControl 获取 Value 和 DisplayMember

Question

之前在 Whosebug 上有人问过这个问题，所以你可能认为它是重复的，但我已经尝试了很多解决方案，但我仍然卡住了。

我有一个绑定到 LINQ 查询的 WinForms CheckedListBoxControl，但我无法获取值和 DisplayMembers。

下面是获取 Value 和 DisplayMember 值的一些尝试：

 var avail = from c in dc.CostCenters
                       select new { Item = c.CostCenterID, 
                               Description = c.CostCenterID + ": " + c.Description };
                myList.DataSource = avail;
                myList.DisplayMember = "Description";


        //Retrieval:
        foreach (var item in myList.CheckedItems)
        {
            DataRowView row = item as DataRowView; //Try 1: row is empty
            string displayMember = item["Description"]; //Try 2: Cannot apply indexing with [] to an expression of type 'object'
            var x = item[0]; //Try 3: Cannot apply indexing with [] to an expression of type 'object'
            row3 = ((DataRowView)myList.CheckedItems[item]).Row; //Try 5 million: Compile error - invalid arguments
        }

Answer 1

假设您只想 get/display 您的 ValueMembers/DisplayMembers：根据您提供的示例，我假设您从 linq 查询中获得了 IEnumerable<dynamic> 。我已将我的测试场景转换为 List<dynamic>:

List<dynamic> list = new List<dynamic>
{
    new { Item = 1, Description = "1: Item1"},
    new { Item = 2, Description = "2: Item2"}
};

只需将 BindingSource 添加到 CheckedListBox：

BindingSource bindingSource = new BindingSource(list, null);

checkedListBox1.DataSource = bindingSource;
checkedListBox1.ValueMember = "Item";
checkedListBox1.DisplayMember = "Description";

当您选择了项目并想要查看时：

var checkedItems = checkedListBox1.CheckedItems;
foreach (dynamic checkedItem in checkedItems)
{
    Console.WriteLine("valuemember: " + checkedItem.Item);
    // or whatever code you have
}

希望对您有所帮助！

无法从绑定到 LINQ 的 CheckedListBoxControl 获取 Value 和 DisplayMember

Can't get Value and DisplayMember from CheckedListBoxControl bound to LINQ

c#

linq

checkedlistbox