c# - 如何将组合框选择的项目转换为字符串

Question

我如何让我的组合框选择的项目从项目源填充到字符串，这样我就可以在我的帖子中使用它，就像 string bolts = comboBox_Copy.Text; 或者string bolts = comboBox.Copy.SelectedItem; 给出 null

     private void boltPatterns()
    {
        {
            try
            {
                string Url = URL_Domain + "resources/bolt-pattern";
                Uri serviceUri = new Uri(Url);
                using (WebClient webClient = new WebClient())
                {
                    webClient.Encoding = Encoding.UTF8;
                    string api = webClient.DownloadString(serviceUri);

                    List<boltPatterns> values =  JsonConvert.DeserializeObject<List<boltPatterns>>(api);
                    comboBox_Copy.ItemsSource= values;
                }
            }

XAML

 <ComboBox x:Name="comboBox_Copy" DisplayMemberPath="BoltPattern" SelectedItem="{Binding BoltPattern}">

Answer 1

string bolts = comboBox.SelectedItem.ToString();