WPF-如何从数据绑定ListBox中获取Listbox项和selectedvalue [英] WPF- How to get Listbox item and selectedvalue from a data bound ListBox

问题描述

嗨朋友，



任何人请告诉我如何从数据绑定列表框中获取所选值和项目



请帮帮我，提前致谢。



XAML代码

Hi Friends,

Anyone please let me know how to get the selected value and item from a data bound ListBox

Please help me, Thanks in advance.

XAML code

<ListBox x:Name="listbox1" Width="150" ItemsSource="{Binding Things}" DisplayMemberPath="department_name" SelectedValuePath="department_id" Margin="12,35,326,12"  />

C＃

数据绑定与数据集

C#
Data binding with Dataset

listbox1.DisplayMemberPath = "department_name";
listbox1.SelectedValuePath = "department_id";
listbox1.ItemsSource = ds.Tables[0].DefaultView;

输出

Output

MessageBox.Show(listbox1.Items.CurrentItem.ToString());//Output -System.Data.DataRowView
MessageBox.Show(listbox1.SelectedItem.ToString());////Output -System.Data.DataRowView
MessageBox.Show(listbox1.SelectedValue.ToString());//Object reference not set to an instance of an object.

推荐答案

您好kznaneswar，您的ListBox中是否有任何选定的项目？

Hi kznaneswar, Have you got any selected item in your ListBox?

MessageBox.Show(listbox1.SelectedValue != null ? listbox1.SelectedValue.ToString() : "I have 0 selected item!"); // If the selected value is null print a custom message.

编辑（根据您的评论） .-

在您的Selection_Changed事件中写下：

Edit(based on your comment).-
Inside your Selection_Changed event write this:

if (listbox1.SelectedItem!=null)
{
    MessageBox.Show(listbox1.Items.CurrentItem.ToString());//Output -System.Data.DataRowView
    MessageBox.Show(listbox1.SelectedItem.ToString());////Output -System.Data.DataRowView
    MessageBox.Show(listbox1.SelectedValue != null ? listbox1.SelectedValue.ToString() : "I have 0 selected item!");
}

另一种方法。这将起作用！

Another approach. This going to work!

if (listbox1.SelectedItem!=null)
{
    DataRowView d1=listbox1.SelectedItem as DataRowView;
    MessageBox.Show(d1["department_id"].tostring());
}

希望有所帮助。

Hope it helps.

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