如何在C＃Winforms中创建下拉信息框？ [英] How to create drop down information box in C# Winforms?

问题描述

我要创建一个按钮，该按钮可以下拉包含用户帮助文档的多行标签或表单。

I want to make a button that can drop down a multi-line label or form which contains help documentation for the user.

我已经搜索过，但找不到适用于C＃Winforms的任何东西。是否为此存在任何免费控件，还是我必须自己创建它？
非常感谢，
Richard

I have searched and I can't find anything that is for C# Winforms. Do any free controls out there exist for this or will I have to create it myself? Many thanks, Richard

推荐答案

使用ToolStripControlHost和ToolStripDropDown控件可以为您提供此功能：

Using ToolStripControlHost and ToolStripDropDown controls can provide this for you:

private void button1_Click(object sender, EventArgs e) {
  var helpInfo = new StringBuilder();
  helpInfo.AppendLine("This is line one.");
  helpInfo.AppendLine("This is line two.");
  var textHelp = new TextBox() { Multiline = true,
                                 ReadOnly = true,
                                 Text = helpInfo.ToString(),
                                 MinimumSize = new Size(100, 100)
                                };
  var toolHost = new ToolStripControlHost(textHelp);
  toolHost.Margin = new Padding(0);
  var toolDrop = new ToolStripDropDown();
  toolDrop.Padding = new Padding(0);
  toolDrop.Items.Add(toolHost);
  toolDrop.Show(button1, button1.Width, 0);
}

结果：

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