我的程序中有一个富文本框（richTextBox1），如下所示。但是当我右键单击它时，它并没有弹出“复制，剪切，过去”窗口。你能告诉我如何在我的富文本框中启用这个“复制、剪切、过去”窗口吗？我是 C# 新手，如果你知道如何解决这个问题，请一步一步告诉我
【问题讨论】：
RichTextBox 确实有这个菜单。只是说。或许最好不要使用稍微破旧的旧技术开始新项目。
标签： c# vb.net visual-studio
如果你有多个RichTextBox，那么你可以使用这个extension方法：
public static void AddContextMenu(this RichTextBox rtb)
{
if (rtb.ContextMenuStrip == null)
{
ContextMenuStrip cms = new ContextMenuStrip()
{
ShowImageMargin = false
};
ToolStripMenuItem tsmiUndo = new ToolStripMenuItem("Undo");
tsmiUndo.Click += (sender, e) => rtb.Undo();
cms.Items.Add(tsmiUndo);
ToolStripMenuItem tsmiRedo = new ToolStripMenuItem("Redo");
tsmiRedo.Click += (sender, e) => rtb.Redo();
cms.Items.Add(tsmiRedo);
cms.Items.Add(new ToolStripSeparator());
ToolStripMenuItem tsmiCut = new ToolStripMenuItem("Cut");
tsmiCut.Click += (sender, e) => rtb.Cut();
cms.Items.Add(tsmiCut);
ToolStripMenuItem tsmiCopy = new ToolStripMenuItem("Copy");
tsmiCopy.Click += (sender, e) => rtb.Copy();
cms.Items.Add(tsmiCopy);
ToolStripMenuItem tsmiPaste = new ToolStripMenuItem("Paste");
tsmiPaste.Click += (sender, e) => rtb.Paste();
cms.Items.Add(tsmiPaste);
ToolStripMenuItem tsmiDelete = new ToolStripMenuItem("Delete");
tsmiDelete.Click += (sender, e) => rtb.SelectedText = "";
cms.Items.Add(tsmiDelete);
cms.Items.Add(new ToolStripSeparator());
ToolStripMenuItem tsmiSelectAll = new ToolStripMenuItem("Select All");
tsmiSelectAll.Click += (sender, e) => rtb.SelectAll();
cms.Items.Add(tsmiSelectAll);
cms.Opening += (sender, e) =>
{
tsmiUndo.Enabled = !rtb.ReadOnly && rtb.CanUndo;
tsmiRedo.Enabled = !rtb.ReadOnly && rtb.CanRedo;
tsmiCut.Enabled = !rtb.ReadOnly && rtb.SelectionLength > 0;
tsmiCopy.Enabled = rtb.SelectionLength > 0;
tsmiPaste.Enabled = !rtb.ReadOnly && Clipboard.ContainsText();
tsmiDelete.Enabled = !rtb.ReadOnly && rtb.SelectionLength > 0;
tsmiSelectAll.Enabled = rtb.TextLength > 0 && rtb.SelectionLength < rtb.TextLength;
};
rtb.ContextMenuStrip = cms;
}
}
并像这样使用它：richTextBox1.AddContextMenu();
【讨论】：
if (!rtb.ReadOnly) { - 或者有意义的变灰怎么样？对于没有经验的用户，您还可以添加一个提示：在 Form1.cs 中是不可能的，但在 Program.cs 中它可以工作。
tsmiDelete.Enabled = !rtb.ReadOnly && rtb.SelectionLength > 0;
试试这个代码
UPDATED CODE:
private void richTextBox1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{ //click event
//MessageBox.Show("you got it!");
ContextMenu contextMenu = new System.Windows.Forms.ContextMenu();
MenuItem menuItem = new MenuItem("Cut");
menuItem.Click += new EventHandler(CutAction);
contextMenu.MenuItems.Add(menuItem);
menuItem = new MenuItem("Copy");
menuItem.Click += new EventHandler(CopyAction);
contextMenu.MenuItems.Add(menuItem);
menuItem = new MenuItem("Paste");
menuItem.Click += new EventHandler(PasteAction);
contextMenu.MenuItems.Add(menuItem);
richTextBox1.ContextMenu = contextMenu;
}
}
void CutAction(object sender, EventArgs e)
{
richTextBox1.Cut();
}
void CopyAction(object sender, EventArgs e)
{
Graphics objGraphics;
Clipboard.SetData(DataFormats.Rtf, richTextBox1.SelectedRtf);
Clipboard.Clear();
}
void PasteAction(object sender, EventArgs e)
{
if (Clipboard.ContainsText(TextDataFormat.Rtf))
{
richTextBox1.SelectedRtf
= Clipboard.GetData(DataFormats.Rtf).ToString();
}
}
如果你想用记事本(without styles )等其他应用程序复制粘贴，请替换以下方法
void CopyAction(object sender, EventArgs e)
{
Clipboard.SetText(richTextBox1.SelectedText);
}
void PasteAction(object sender, EventArgs e)
{
if (Clipboard.ContainsText())
{
richTextBox1.Text
+= Clipboard.GetText(TextDataFormat.Text).ToString();
}
}
【讨论】：
MenuStrip？因为当我使用您的代码时，private void richTextBox1_MouseUp(object sender, MouseEventArgs e) 没有被调用。如果我双击原图所示的richTextBox1，它将在Form1.Designer.cs和Form1.cs自动生成代码：-private void richTextBox1_TextChanged(object sender, EventArgs e)你能告诉我我应该怎么做才能让我的程序生成代码private void richTextBox1_MouseUp(object sender, MouseEventArgs e)
richTextBox1 内做copy, cut, past 的事情，它会起作用。如果我从 `richTextBox1` 切入并在记事本中过去，它也可以工作。但是如果我尝试从richTextBox1 复制并粘贴到记事本中，它就不起作用了。最重要的是，如果我想将记事本中的一些文本复制到这个 `richTextBox1` 中，则代码不起作用。非常感谢您对此的关注。
标准的 RichTextBox 不包含用于剪切、复制和粘贴的上下文菜单。但是，您可以查看this article，其中包含实现您自己所需的完整代码！
【讨论】：
我认为 Thilina H 提供的解决方案非常好，除了一些错误。
MouseUp 事件导致右键单击在第二次单击后开始。我建议使用 MouseDown 事件而不是 MouseUp 事件。
我测试了第二个提供的 CopyAction 方法。在我的情况下， CopyAction 方法没有复制输入字符。我不得不像这样编辑代码：
Clipboard.SetText(richTextBox1.SelectedText.Replace("\n", "\r\n"));
当richTextBox1.SelectedText 为空时，程序显示异常。我只是编辑了如下所示的 CopyAction 方法来解决问题。
if (chatBox.SelectedText != null && chatBox.SelectedText != "")
{
Clipboard.SetText(richTextBox1.SelectedText.Replace("\n", "\r\n"));
}
编码愉快！
【讨论】：
如果您需要将标准上下文菜单添加到多个 RichTextBox 实例，那么创建从 RichTextBox 继承的自定义扩展组件可能会更好。可以从解决方案资源管理器项目上下文菜单添加新组件添加 -> 新项目... -> 自定义控件。
您还可以为上下文菜单打开定义处理程序，以检查是否选择了任何文本、剪贴板是否为空以及控件是否未设置为只读。
支持其他有用的标准操作也很好，例如撤消、重做、删除和全选。
namespace Common
{
public partial class RichTextBoxEx : RichTextBox
{
public RichTextBoxEx()
{
AddContextMenu();
}
public void AddContextMenu()
{
ContextMenuStrip cms = new ContextMenuStrip { ShowImageMargin = false };
ToolStripMenuItem tsmiUndo = new ToolStripMenuItem("Undo");
tsmiUndo.Click += (sender, e) => { if (CanUndo) Undo(); };
tsmiUndo.ShortcutKeys = Keys.Z | Keys.Control;
cms.Items.Add(tsmiUndo);
ToolStripMenuItem tsmiRedo = new ToolStripMenuItem("Redo");
tsmiRedo.Click += (sender, e) => { if (CanRedo) Redo(); };
tsmiRedo.ShortcutKeys = Keys.Y | Keys.Control;
cms.Items.Add(tsmiRedo);
cms.Items.Add(new ToolStripSeparator());
ToolStripMenuItem tsmiCut = new ToolStripMenuItem("Cut");
tsmiCut.Click += (sender, e) => Cut();
tsmiCut.ShortcutKeys = Keys.X | Keys.Control;
cms.Items.Add(tsmiCut);
ToolStripMenuItem tsmiCopy = new ToolStripMenuItem("Copy");
tsmiCopy.Click += (sender, e) => Copy();
tsmiCopy.ShortcutKeys = Keys.C | Keys.Control;
cms.Items.Add(tsmiCopy);
ToolStripMenuItem tsmiPaste = new ToolStripMenuItem("Paste");
tsmiPaste.Click += (sender, e) => Paste();
tsmiPaste.ShortcutKeys = Keys.V | Keys.Control;
cms.Items.Add(tsmiPaste);
ToolStripMenuItem tsmiDelete = new ToolStripMenuItem("Delete");
tsmiDelete.Click += (sender, e) => { SelectedText = ""; };
cms.Items.Add(tsmiDelete);
cms.Items.Add(new ToolStripSeparator());
ToolStripMenuItem tsmiSelectAll = new ToolStripMenuItem("Select All");
tsmiSelectAll.Click += (sender, e) => { SelectionStart = 0; SelectionLength = Text.Length; };
tsmiSelectAll.ShortcutKeys = Keys.A | Keys.Control;
cms.Items.Add(tsmiSelectAll);
cms.Opening += delegate (object sender, CancelEventArgs e)
{
tsmiUndo.Enabled = CanUndo && !this.ReadOnly;
tsmiRedo.Enabled = CanRedo && !this.ReadOnly;
tsmiCut.Enabled = (SelectionLength != 0) && !this.ReadOnly;
tsmiCopy.Enabled = SelectionLength != 0;
tsmiPaste.Enabled = Clipboard.ContainsText() && !this.ReadOnly;
tsmiDelete.Enabled = (SelectionLength != 0) && !this.ReadOnly;
tsmiSelectAll.Enabled = (TextLength > 0) && (SelectionLength < TextLength);
};
ContextMenuStrip = cms;
}
}
}
【讨论】：
我只是想补充一下Thilina H的答案（被海报标记为正确答案的那个） 这是我的复制和粘贴功能，它们有点像记事本。
void CopyAction(object sender, EventArgs e)
{
if (richTextBox1.SelectedText != null && richTextBox1.SelectedText != "")
{
Clipboard.SetText(richTextBox1.SelectedText);
}
}
void PasteAction(object sender, EventArgs e)
{
if (Clipboard.ContainsText())
{
int selstart = richTextBox1.SelectionStart;
if (richTextBox1.SelectedText != null && richTextBox1.SelectedText != "")
{
richTextBox1.Text = richTextBox1.Text.Remove(selstart, richTextBox1.SelectionLength);
}
string clip = Clipboard.GetText(TextDataFormat.Text).ToString();
richTextBox1.Text = richTextBox1.Text.Insert(selstart, clip);
richTextBox1.SelectionStart = selstart + clip.Length;
}
}
我希望它对某人有所帮助；
【讨论】：
感谢@Jaex
https://stackoverflow.com/a/36624233/5132252
https://stackoverflow.com/a/435510/5132252
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Winapi)]
internal static extern IntPtr GetFocus();
private Control GetFocusedControl()
{
Control focusedControl = null;
// To get hold of the focused control:
IntPtr focusedHandle = GetFocus();
if (focusedHandle != IntPtr.Zero)
// Note that if the focused Control is not a .Net control, then this will return null.
focusedControl = Control.FromHandle(focusedHandle);
return focusedControl;
}
private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
{
if (Clipboard.ContainsText())
{
var FocusedControl = GetFocusedControl();
if (FocusedControl != null)
switch (FocusedControl.GetType().Name)
{
case "RichTextBox":
{
var RichTextBox = FocusedControl as RichTextBox;
RichTextBox.Paste();
break;
}
case "TextBox":
{
var TextBox = FocusedControl as TextBox;
TextBox.Paste();
break;
}
}
}
}
【讨论】：