C# c文本框显示对象名称而不是值

我有一个用c写的表单，有各种下拉列表，但是表单上的列表框有问题。双击列表框时，我需要用从列表框中选择的值填充文本框。我已经让click事件工作，但是textbox将只填充对象名，而不是列表框中的值

i、 e

'System.Windows.Controls.SelectedItemCollection'

而不是实际值

下面是我正在处理的整个代码块：

else if (theValue.FieldName.Equals("UIPathList", StringComparison.OrdinalIgnoreCase) == true)
            {
                int nRow = 14;
                Button theUIPathOptionsButton = new Button();

                TextBox theOldValueTextBox = AddLabelAndOldValue(theHelper, nRow, theValue);
                theOldValueTextBox.Text = theValue.OldValue.Replace(",", "," + Environment.NewLine);

                theUIPathOuterStackPanel = new StackPanel
                {
                    Visibility = Visibility.Visible,
                    Orientation = Orientation.Vertical,
                    Background = new SolidColorBrush(Colors.White),
                    ClipToBounds = true,
                };

                theUIPathOptionsInnerStackPanel = new StackPanel
                {
                    Visibility = Visibility.Visible,
                    Orientation = Orientation.Horizontal,
                    Background = new SolidColorBrush(Colors.White)
                };
                theUIPathOuterStackPanel.ClipToBounds = true;

                TextBox theNewTextBox = new TextBox
                {
                    TabIndex = nRow,
                    TextWrapping = TextWrapping.Wrap,
                    AcceptsReturn = true,
                };

                theNewTextBox.Clear();
                theNewTextBox.MouseDoubleClick += MultiLineChildDatapointList_HandleMouseDoubleClick;
                theNewTextBox.Focusable = true;
                theNewTextBox.HorizontalAlignment = HorizontalAlignment.Stretch;
                theNewTextBox.Width = 365;

                theNewTextBox.PreviewKeyDown += theGetMetadataHelper.Preview_KeyDown_IsMultilineText;

                theNewTextBox.Tag = theValue;

                ListBox theUIPathOptionslistBox = new ListBox();
                theUIPathOptionslistBox.Items.Add("RuntimeDefaults");
                theUIPathOptionslistBox.Items.Add("CommonSettings");
                theUIPathOptionslistBox.Items.Add(InputDatapointManager.CONST_CHANGE_RECORD_CHANGES_CLEAR_VALUE);
                theUIPathOptionslistBox.TabIndex = nRow;
                theUIPathOptionslistBox.SelectionMode = SelectionMode.Multiple;
                theUIPathOptionslistBox.ClipToBounds = true;
                theUIPathOptionslistBox.Focusable = true;
                theUIPathOptionslistBox.Visibility = Visibility.Hidden;
                theUIPathOptionslistBox.Height = 34;

                theUIPathOptionsInnerStackPanel.Children.Add(theNewTextBox);
                theUIPathOptionsInnerStackPanel.Children.Add(theUIPathOptionsButton);

                theUIPathOuterStackPanel.Children.Add(theUIPathOptionsInnerStackPanel);
                theUIPathOuterStackPanel.Children.Add(theUIPathOptionslistBox);

                void button1_click(object sender, EventArgs e)
                {
                    theUIPathOptionslistBox.Visibility = Visibility.Visible;
                }

                void button1_doubleclick(object sender, EventArgs e)
                {
                    theNewTextBox.Text = theUIPathOptionslistBox.SelectedItem.ToString();
                }

                theUIPathOptionsButton.Click += button1_click;
                theUIPathOptionslistBox.MouseDoubleClick += button1_doubleclick;

                Grid.SetColumn(theUIPathOuterStackPanel, 4);
                Grid.SetRow(theUIPathOuterStackPanel, nRow);
                theDataGrid.Children.Add(theUIPathOuterStackPanel);

                theEditControlList.Add(theNewTextBox);
            }

我应该在一开始就这样做-下面是我正在处理的完整代码块：

else if (theValue.FieldName.Equals("UIPathList", StringComparison.OrdinalIgnoreCase) == true)
            {
                int nRow = 14;
                Button theUIPathOptionsButton = new Button();

                TextBox theOldValueTextBox = AddLabelAndOldValue(theHelper, nRow, theValue);
                theOldValueTextBox.Text = theValue.OldValue.Replace(",", "," + Environment.NewLine);

                theUIPathOuterStackPanel = new StackPanel
                {
                    Visibility = Visibility.Visible,
                    Orientation = Orientation.Vertical,
                    Background = new SolidColorBrush(Colors.White),
                    ClipToBounds = true,
                };

                theUIPathOptionsInnerStackPanel = new StackPanel
                {
                    Visibility = Visibility.Visible,
                    Orientation = Orientation.Horizontal,
                    Background = new SolidColorBrush(Colors.White)
                };
                theUIPathOuterStackPanel.ClipToBounds = true;

                TextBox theNewTextBox = new TextBox
                {
                    TabIndex = nRow,
                    TextWrapping = TextWrapping.Wrap,
                    AcceptsReturn = true,
                };

                theNewTextBox.Clear();
                theNewTextBox.MouseDoubleClick += MultiLineChildDatapointList_HandleMouseDoubleClick;
                theNewTextBox.Focusable = true;
                theNewTextBox.HorizontalAlignment = HorizontalAlignment.Stretch;
                theNewTextBox.Width = 365;

                theNewTextBox.PreviewKeyDown += theGetMetadataHelper.Preview_KeyDown_IsMultilineText;

                theNewTextBox.Tag = theValue;

                ListBox theUIPathOptionslistBox = new ListBox();
                theUIPathOptionslistBox.Items.Add("RuntimeDefaults");
                theUIPathOptionslistBox.Items.Add("CommonSettings");
                theUIPathOptionslistBox.Items.Add(InputDatapointManager.CONST_CHANGE_RECORD_CHANGES_CLEAR_VALUE);
                theUIPathOptionslistBox.TabIndex = nRow;
                theUIPathOptionslistBox.SelectionMode = SelectionMode.Multiple;
                theUIPathOptionslistBox.ClipToBounds = true;
                theUIPathOptionslistBox.Focusable = true;
                theUIPathOptionslistBox.Visibility = Visibility.Hidden;
                theUIPathOptionslistBox.Height = 34;

                theUIPathOptionsInnerStackPanel.Children.Add(theNewTextBox);
                theUIPathOptionsInnerStackPanel.Children.Add(theUIPathOptionsButton);

                theUIPathOuterStackPanel.Children.Add(theUIPathOptionsInnerStackPanel);
                theUIPathOuterStackPanel.Children.Add(theUIPathOptionslistBox);

                void button1_click(object sender, EventArgs e)
                {
                    theUIPathOptionslistBox.Visibility = Visibility.Visible;
                }

                void button1_doubleclick(object sender, EventArgs e)
                {
                    theNewTextBox.Text = theUIPathOptionslistBox.SelectedItem.ToString();
                }

                theUIPathOptionsButton.Click += button1_click;
                theUIPathOptionslistBox.MouseDoubleClick += button1_doubleclick;

                Grid.SetColumn(theUIPathOuterStackPanel, 4);
                Grid.SetRow(theUIPathOuterStackPanel, nRow);
                theDataGrid.Children.Add(theUIPathOuterStackPanel);

                theEditControlList.Add(theNewTextBox);
            }

这是因为TextBox将对其绑定的对象使用ToString方法，默认情况下，该方法将返回类名

---

解决方案是重写类的ToString方法以返回所需的值，或者将TextBox的text属性设置为所需的文本值，而不是对象。

ListBox，Item是对象的集合，而不是字符串，因此必须让它知道如何将其转换为字符串，否则，它将使用其default.ToString函数，显然，当前项目中的对象不会给出期望的结果

假设项目的类型如下所示：

class SomeClass
{
      public int Id;
      public string Name;
}

您可以执行以下三种操作之一：

1.将ListBox的DisplayMember设置为Name

2.将override方法添加到类中，使其重写其.ToString并返回其Name属性：

class SomeClass
{
      public int Id;
      public string Name;

      public override string ToString()
      {
            return Name;
      }
}

3.只需将其转换为真实类型，即可获得所需的属性：

SomeClass selected = (SomeClass)ListBox.SelectedItem;
TextBox1.Text = selected.Name;

---

这可能已经在这里得到了回答：

然后，您只需将项目添加到文本框：

textBox1.Text = myItem;

如果不想创建新的字符串变量，则此变量也可以：

textBox1.Text = listBox1.SelectedItem.ToString();

---

我最终得到的解决方案如下：

void theUIPathOptionslistBox_SelectedIndexChanged(object sender, 
SelectionChangedEventArgs e)
{
    theNewTextBox.Clear();
    foreach (object selectedItem in theUIPathOptionslistBox.SelectedItems)
    {
        theNewTextBox.AppendText(selectedItem.ToString() + Environment.NewLine);
    }
}
theUIPathOptionslistBox.SelectionChanged += 
theUIPathOptionslistBox_SelectedIndexChanged;

---

你应该分享你的代码。听起来你是在将文本设置为一个对象，而不是文本值。将其设置为所需的值。所选项目是一个对象。您需要将其强制转换为实际的类型，并将该类型的相应属性指定给textbox value.void按钮1\u双击对象发送者，EventArgs e{theNewTextBox.Text=Options ListBox.SelectedItems.ToString；}当我尝试使用“GetItemText”时，VS告诉我ListBox不包含“GetItemText”的定义-是否需要引入特定的using语句？您只需要使用System.Windows.Forms。刚刚测试了以下行：textBox1.Text=listBox1.SelectedItem.ToString；不幸的是，在这个表单的上下文中，我不能使用Windows.Forms-它会弄乱表单上的所有其他控件、文本框等。谢谢你！此外，我不能使用“textBox1.Text=listBox1.SelectedItem.ToString；”建议-这就是我一直在使用的，并且没有显示所选项目的文本-尝试实现建议的覆盖，但它会干扰此表单上的其他控件等…你的意思是这样的：newtextbox.text=我想要显示的值吗？很抱歉，没有问题，但是当我尝试创建类时，我开始从我所有的其他控件中得到错误，等等-我应该把这个类放在哪里？我觉得这更复杂，因为这段代码在一个巨大的if语句的另一部分中抱歉回答晚了，你不需要创建一个类，我正在设置一个列表框当前输入的示例，它类似于我提到的一个类，为了得到更好的答案，你应该发布你的代码，事实上，如果你发布了你的代码，我们知道项目的确切代码来自哪里，你会在几分钟内收到很多好的答案，你对哪一部分有问题？嗨，阿什坎-如果我提到这是WPF而不是winforms，会有帮助吗？非常感谢你的帮助。我已经下载了这个文件，所以你可以删除评论。