如何向richTextBox控件添加上下文菜单

Question

我做了

private void richTextBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
MessageBox.Show("you got it!");
}
}

但我想要的是：

1. 在richTextBox中右键单击一行时，将该行视为项目，因此菜单命令仅对我右键单击的特定行生效

2. 如果我选择粘贴，它将把新文本粘贴到richTextBox的底部(末尾)。但如果我点击复制或删除，它会认为它是我右键点击的特定行。

3. 为一行或一批行进行粘贴，并将它们作为行添加到richTextBox的底部(末尾)。

这就是我今天将文本作为行添加到richTextBox的方式。这些线是链接。richTextBox中的每一行都是一个链接。我想粘贴到richTextBox的只是链接，而不仅仅是文本。因此，我粘贴到richTextBox的每个链接都应该像我这样添加：for循环只是第一次用于构造函数。

for (int i = 0; i < lines.Count; i++)
{
RichTextBoxExtensions.AppendText(richTextBox1, "Ready: ", Color.Red, 8.25f);
richTextBox1.AppendText(lines[i] + (i < lines.Count - 1 ? Environment.NewLine : String.Empty));
}
richTextBox1.AppendText(Environment.NewLine);
for (int i = 0; i < newList.Count; i++)
{
RichTextBoxExtensions.AppendText(richTextBox1, "Ready: ", Color.Red, 8.25f);
richTextBox1.AppendText(newList[i] + (i < newList.Count - 1 ? Environment.NewLine : String.Empty));
}

行和newList是列表

这只是我如何将链接添加到richTextBox的一个示例。所以当我粘贴一个链接或链接时，它们应该像我这样添加。

这就是richTextBox现在的样子，例如：

Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101330&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101330&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101345&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101345&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101400&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101400&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101415&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101415&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101430&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101430&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101445&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101445&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101500&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101500&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101515&ir=true

因此，如果我现在正在粘贴一个链接，例如：http://microsoft.com现在richTextBox的内容看起来像：

Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101330&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101330&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101345&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101345&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101400&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101400&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101415&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101415&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101430&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101430&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101445&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101445&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101500&ir=true
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101500&ir=false
Ready: http://www.sat24.com/image2.ashx?region=is&time=201702101515&ir=true
Ready: http://www.microsoft.com

如果我粘贴多个链接，它会将链接添加到底部。

我认为这是从剪贴板附加文本的最快方法：

string newText = Clipboard.GetText();
richTextBox1.SelectionStart = richTextBox1.TextLength;
richTextBox1.SelectionLength = 0;
richTextBox1.SelectedText = newText;

但我希望它被添加到richTextBox底部的末尾，并以我使用Ready:进行操作的格式

在什么情况下我应该这样做？如何在代码中添加上下文菜单并使用粘贴菜单？

更新

我现在尝试了这样的东西：

private void richTextBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
var startIndex = richTextBox1.Text.IndexOf("Ready:") + "Ready:".Length;
var length = richTextBox1.Text.IndexOf("Ready:", startIndex) - startIndex;
int index = richTextBox1.SelectionStart;
int line = richTextBox1.GetLineFromCharIndex(index);
var code = richTextBox1.Text.Substring(startIndex + index, length - line - 1);
label1.Text = code;
}

我试着加上两行：

int index = richTextBox1.SelectionStart;
int line = richTextBox1.GetLineFromCharIndex(index);

这两行，当我点击一行时，我正试图获得鼠标光标的位置。因此，它将像listView中的项目一样解析鼠标所在的行文本。

但是子字符串i不正确。

如果我这样做：

private void richTextBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
var startIndex = richTextBox1.Text.IndexOf("Ready:") + "Ready:".Length;
var length = richTextBox1.Text.IndexOf("Ready:", startIndex) - startIndex;
var code = richTextBox1.Text.Substring(startIndex, length - 1);
label1.Text = code;
}
}

它将使我在标签1中始终处于第一行链接。而不是单击鼠标光标位置的行。如果我点击第7行，那么我想在标签1中看到第7行的全部文本。如果我点击第65行，然后在标签1中查看第65行的全部文本。

与列表中的想法相同如果我点击项目查看。

Answer 1

你的问题很直接，但后面有很多不相关的东西。我只是继续尝试回答开头的问题，该问题询问如何向richtextbox添加上下文菜单。

private void txtbx_text1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Right)
{
return;
}
ContextMenu cm = new ContextMenu();//make a context menu instance
MenuItem item = new MenuItem();//make a menuitem instance
item.Text = "remove all";//give the item a header
item.Click += DoNothing;//give the item a click event handler
cm.MenuItems.Add(item);//add the item to the context menu
item = new MenuItem();//recycle the menu item
item.Text = "load from file";//give the item a header
item.Click += DoNothing;//give the item a click event handler
cm.MenuItems.Add(item);//add the item to the context menu
item = new MenuItem();//recycle item into a new menuitem
item.Text = "save list";//give the item a header
item.Click += DoNothing;//give the item a click event handler
cm.MenuItems.Add(item);//add the item to the context menu
((RichTextBox)sender).ContextMenu = cm;//add the context menu to the sender
cm.Show(txtbx_text1, e.Location);//show the context menu
}

private void DoNothing(object sender, EventArgs e)
{
//doing nothing
return;
}

一直在玩弄你的其他要求，以下可能会让你继续前进。它需要一些爱，但前提是存在的，并且有效：

private void txtbx_text1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Right)
{
return;
}
ContextMenu cm = new ContextMenu();//make a context menu instance
MenuItem item = new MenuItem();//make a menuitem instance
item.Text = "remove line";//give the item a header
item.Click += (sendingelement, eventargs) => RemoveLine(item, e);//give the item a click event handler
cm.MenuItems.Add(item);//add the item to the context menu
((RichTextBox)sender).ContextMenu = cm;//add the context menu to the sender
cm.Show(txtbx_text1, e.Location);//show the context menu
}
private void RemoveLine(object sender, MouseEventArgs e)
{
if (txtbx_text1.Text.Length == 0)
{
return;
}
int charNextToCursor = txtbx_text1.GetCharIndexFromPosition(e.Location);
int lineNumFromChar = txtbx_text1.GetLineFromCharIndex(charNextToCursor);
int firstCharOfLine = txtbx_text1.GetFirstCharIndexFromLine(lineNumFromChar);
int lineLength = txtbx_text1.Lines[lineNumFromChar].Length;
string firstchar = txtbx_text1.Text.Substring(firstCharOfLine, 1);
//txtbx_text1.Text = txtbx_text1.Text.Remove(firstCharOfLine, lineLength);
if (lineNumFromChar == 0)
{
if (txtbx_text1.Lines.Length > 1)
{
txtbx_text1.Text = txtbx_text1.Text.Remove(firstCharOfLine, lineLength + 1);
}
else
{
txtbx_text1.Text = txtbx_text1.Text.Remove(firstCharOfLine, lineLength);
}
}
else
{
txtbx_text1.Text = txtbx_text1.Text.Remove(firstCharOfLine - 1, lineLength + 1);
}
((MenuItem)sender).Parent.Dispose();
return;
}