C# 如何在函数中使用MessageBox

我试图让函数接受两个字符串并显示消息框：

public void Myfunction (string str1, string str2)
     {
         MessageBox.Show("your message was " + str1 + Environment.NewLine + str2);
     }

private void Btn_Display_Click(object sender, RoutedEventArgs e)
    {
        string today;
        today = DateTime.Now.ToString("dd/MM/yyyy");
        myfunction(TextBox_Msg.Text, today);
    }

---

现在还不清楚发生了什么，比如说，

myfunction

应该做什么？函数计算值。 我建议一次性显示信息：

如果您坚持提取方法，那么让我们首先将其重命名-

ShowMessageLines

：

// Let's show arbitrary many lines (whe only 2?)
// Let's accept all types (not necessary strings)
public static void ShowMessageLines(params object[] lines) {
  // public method - input arguments validation
  if (null == lines)
    throw new ArgumentNullException(nameof(lines));

  // Combine all lines into textToShow
  // First line must have a prefix - "your message was " 
  string textToShow = string.Join(Environment.NewLine, lines
    .Select((text, index) => index == 0 
       ? $"your message was {text}"
       :   text?.ToString()));

  MessageBox.Show(textToShow);
}

...

private void Btn_Display_Click(object sender, RoutedEventArgs e) {
  ShowMessageLines(
    TextBox_Msg.Text, 
    DateTime.Now.ToString("dd/MM/yyyy"));
}

---

MessageBox.Show（string.Join（Environment.NewLine，$“您的消息是{TextBox\u Msg.Text}）”，DateTime.Now.ToString（“dd/MM/yyyy”）此问题不包含文本，仅包含源代码。有什么不起作用吗？除了卷曲的妄想症，一切看起来都很好。
// Let's show arbitrary many lines (whe only 2?)
// Let's accept all types (not necessary strings)
public static void ShowMessageLines(params object[] lines) {
  // public method - input arguments validation
  if (null == lines)
    throw new ArgumentNullException(nameof(lines));

  // Combine all lines into textToShow
  // First line must have a prefix - "your message was " 
  string textToShow = string.Join(Environment.NewLine, lines
    .Select((text, index) => index == 0 
       ? $"your message was {text}"
       :   text?.ToString()));

  MessageBox.Show(textToShow);
}

...

private void Btn_Display_Click(object sender, RoutedEventArgs e) {
  ShowMessageLines(
    TextBox_Msg.Text, 
    DateTime.Now.ToString("dd/MM/yyyy"));
}