获取ValueMember从所选项目在ListBox用C＃ [英] Getting ValueMember from selected item in a ListBox with C#

问题描述

我想从用C＃一个ListBox所有选定项目ValueMember

I'm trying to get all the selected items ValueMember from a ListBox with C#.

有关例如：

我有这样一个列表：

ID | Name and Lastname
----------------------
1  | John Something
2  | Peter Something2
3  | Mary Smith

这结构我ListBox中的一部分。我已经建造这个列表框使用此代码：

This structure is part of my ListBox. I've builded this listbox with this code:

private void fill_people_listBox()
{
    this.listBoxPeople.DataSource = db.query("SELECT ....");
    this.listBoxPeople.DisplayMember = "people_name_last";
    this.listBoxPeople.ValueMember = "people_id"; 
}

列表框成功填充。当用户想保存我有循环throught这个名单来获取所有所选项目的变化，但我并不需要的项目，我需要的ID。

The ListBox is successfully populated. When the user wants to save the changes I've to loop throught this list to get all the selected items, but I do not need the Item, I need the ID.

例如：

1 | John Something.

忽略约翰东西，拿到1，所以我不需要的DisplayMember，只有ValueMember。

Ignore John Something, get 1, so I do not need the DisplayMember, only the ValueMember.

要做到这一点，我已经尝试用以下几种方式：

To do this I've try several ways with the following:

1°

        foreach (ListBox selectedItem in this.listBoxGarantes.SelectedItems)
        {
            selectedItem.ToString(); // just an example, I'm printing this.

        }

2°

2º

        string strItem;

        // insert garantes
        foreach (object selectedItem in this.listBoxGarantes.SelectedItems)
        {
            strItem = selectedItem as String;

            strItem; // just an example, I'm printing this.
        }

3°和他人之间这最后一个。

3º And this last one among others.

        foreach (ListViewItem element in this.listBoxGarantes.Items)
        {
            if (element.Selected)
            {
                element.SubItems[0].Text; // just an example, I'm printing this.
            }
        }

我已经尝试多种选择，但我没' ŧ能够获得成功地标识每个元素。我不知道自己还能做些什么。

I've try several options, but I wasn't able to get succesfully the ID for each element. I do not know what else to do.

我希望有人能帮助我。

问候。

推荐答案

既然你有多个选择，因为你是通过SelectedItems名单列举SelectedValue属性不会帮你了。

Since you have multiple selections, the SelectedValue property won't help you much since you are enumerating through the SelectedItems list.

尝试投您的项目回一个DataRowView的对象：

Try casting your items back into a DataRowView object:

foreach (var item in listBox1.SelectedItems) {
  MessageBox.Show("ID = " + ((DataRowView)item)["people_id"].ToString());
}

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