C# winform中的列表框选定项目
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listbox selected items in winform
提问by Surya sasidhar
I have listbox, button, and textbox controls in a Windows application. How can I display multiple selected values in a textbox.
我在 Windows 应用程序中有列表框、按钮和文本框控件。如何在文本框中显示多个选定的值。
this is my code
这是我的代码
textBox1.Text = listBox1.SelectedItems.ToString();
but it display in textbox like this: (I select more than one item)
但它显示在这样的文本框中：（我选择了多个项目）
System.Windows.Forms.ListBox+Selec.
please help me
请帮我
采纳答案by Robban
You could do something like:
你可以这样做：
string text = "";
foreach (System.Data.DataRowView item in listBox1.SelectedItems) {
text += item.Row.Field<String>(0) + ", ";
}
textBox1.Text = text;
回答by JDunkerley
You need to iterate over the collection of items. Something like:
您需要遍历项目集合。就像是：
textBox1.Text = "";
foreach (object o in listBox1.SelectedItems)
textBox1.Text += (textBox1.Text == "" ? "" :", ") + o.ToString();
回答by rahul
ListBox.SelectedItems: Returns a collection of the currently selected items.
ListBox.SelectedItems：返回当前所选项目的集合。
Loop through the SelectedItems collection of the listbox.
循环遍历列表框的 SelectedItems 集合。
foreach (ListItem liItem in ListBox1.SelectedItems)
{
// write your code.
}
回答by Xiaohuan ZHOU
Actrually, if you know the type of object you input into ListBox, the selected item is that type, here is a sample: Input List of FileInfo to ListBox:
实际上，如果您知道输入到 ListBox 中的对象类型，则所选项目就是该类型，这里是一个示例：将 FileInfo 的列表输入到 ListBox：
FileInfo[] lFInfo = new DirectoryInfo(textBox1.Text).GetFiles();
foreach (var i in lFInfo)
lstFile.Items.Add(i);
A copy function to copy the selected files to path of textBox2.Text:
将选定文件复制到 textBox2.Text 路径的复制功能：
private void btnCopy_Click(object sender, EventArgs e)
{
foreach (FileInfo i in lstFile.SelectedItems)
File.Copy(i.FullName, Path.Combine(textBox2.Text, i.Name));
}
回答by Reza Aghaei
The post is quite old but lacks a correct general answer which can work regardless of the data-bound item type for example for
List<T>,DataTable, or can work regardless of setting or not settingDisplayMember.
该帖子很旧，但缺乏正确的通用答案，无论数据绑定项目类型如何，例如 for
List<T>,DataTable都可以工作，或者无论设置或不设置都可以工作DisplayMember。
The correct way to get text of an item in a ListBoxor a ComboBoxis using GetItemTextmethod.
在 aListBox或 a 中获取项目文本的正确方法ComboBox是使用GetItemText方法。
It doesn't matter what is the type of item, if you have used DataSourceand DisplayMemberit uses DisplayMemberto return text, otherwise it uses ToStringmethod of item.
项目的类型是什么并不重要，如果您使用过DataSource并且DisplayMember它用于DisplayMember返回文本，否则它使用ToString项目的方法。
For example, to get a comma-separated list of selected item texts:
例如，要获取以逗号分隔的所选项目文本列表：
var texts = this.listBox1.SelectedItems.Cast<object>()
.Select(x => this.listBox1.GetItemText(x));
MessageBox.Show(string.Join(",", texts));
Note:For those who are looking for selected item values rather that selected item texts regardless of the item type and the value member field, they use GetItemValueextension method.
注意：对于那些正在寻找选定项目值而不是选定项目文本的人，无论项目类型和值成员字段如何，他们都使用GetItemValue扩展方法。
