如何使用RichTextBox控件將\\ line附加到RTF中

Question

使用Microsoft RichTextBox控件時，可以添加這樣的新行......

richtextbox.AppendText(System.Environment.NewLine); // appends \r\n

但是，如果您現在查看生成的rtf，\\ r \\ n字符將轉換為\\ par not \\ line

如何在生成的RTF中插入\\ line控制代碼？

什么行不通：

令牌替換

黑客喜歡在字符串的末尾插入一個令牌，然后在事實之后替換它，所以像這樣：

string text = "my text";
text = text.Replace("||" "|"); // replace any '|' chars with a double '||' so they aren't confused in the output.
text = text.Replace("\r\n", "_|0|_"); // replace \r\n with a placeholder of |0|

richtextbox.AppendText(text);

string rtf = richtextbox.Rtf;
rtf.Replace("_|0|_", "\\line"); // replace placeholder with \line
rtf.Replace("||", "|"); // set back any || chars to |

這幾乎可以工作，如果你必須支持從右到左的文本，它會分解，因為從右到左的控制序列總是在占位符的中間結束。

發送密鑰消息

public void AppendNewLine()
{
    Keys[] keys = new Keys[] {Keys.Shift, Keys.Return};
    SendKeys(keys);
}

private void SendKeys(Keys[] keys)
{
    foreach(Keys key in keys)
    {
        SendKeyDown(key);
    }
}

private void SendKeyDown(Keys key)
{
    user32.SendMessage(this.Handle, Messages.WM_KEYDOWN, (int)key, 0);
}

private void SendKeyUp(Keys key)
{
    user32.SendMessage(this.Handle, Messages.WM_KEYUP, (int)key, 0);
}

這也最終被轉換為\\ par

有沒有辦法將消息直接發布到msftedit控件以插入控制字符？

我完全難過，任何想法的家伙？ 謝謝你的幫助！

Answer 1

在我的測試中顯示，添加Unicode“行分隔符”（U + 2028）確實有效：

private void Form_Load(object sender, EventArgs e)
{
    richText.AppendText("Hello, World!\u2028");
    richText.AppendText("Hello, World!\u2028");
    string rtf = richText.Rtf;
    richText.AppendText(rtf);
}

當我運行程序時，我得到：

Hello, World!
Hello, World!
{\rtf1\ansi\ansicpg1252\deff0\deflang1031{\fonttbl{\f0\fnil\fcharset0 Courier New;}}
{\colortbl ;\red255\green255\blue255;}
\viewkind4\uc1\pard\cf1\f0\fs17 Hello, World!\line Hello, World!\line\par
}

它確實添加了\\line而不是\\par 。

Answer 2

由於您想使用不同的RTF代碼，我認為您可能需要忘記簡單的AppendText（）方法並直接操作RichTextBox的.Rtf屬性。 這是一個示例（測試）來演示：

RichTextBox rtb = new RichTextBox();
//this just gets the textbox to populate its Rtf property... may not be necessary in typical usage
rtb.AppendText("blah");
rtb.Clear();

string rtf = rtb.Rtf;

//exclude the final } and anything after it so we can use Append instead of Insert
StringBuilder richText = new StringBuilder(rtf, 0, rtf.LastIndexOf('}'), rtf.Length /* this capacity should be selected for the specific application */);

for (int i = 0; i < 5; i++)
{
    string lineText = "example text" + i;
    richText.Append(lineText);
    //add a \line and CRLF to separate this line of text from the next one
    richText.AppendLine(@"\line");
}

//Add back the final } and newline
richText.AppendLine("}");


System.Diagnostics.Debug.WriteLine("Original RTF data:");
System.Diagnostics.Debug.WriteLine(rtf);

System.Diagnostics.Debug.WriteLine("New Data:");
System.Diagnostics.Debug.WriteLine(richText.ToString());


//Write the RTF data back into the RichTextBox.
//WARNING - .NET will reformat the data to its liking at this point, removing
//any unused colors from the color table and simplifying/standardizing the RTF.
rtb.Rtf = richText.ToString();

//Print out the resulting Rtf data after .NET (potentially) reformats it
System.Diagnostics.Debug.WriteLine("Resulting Data:");
System.Diagnostics.Debug.WriteLine(rtb.Rtf);

輸出：

原始RTF數據：

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}
\viewkind4\uc1\pard\f0\fs17\par
}

新的RTF數據：

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}
\viewkind4\uc1\pard\f0\fs17\par
example text0\line
example text1\line
example text2\line
example text3\line
example text4\line
}

產生的RTF數據：

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}
\viewkind4\uc1\pard\f0\fs17\par
example text0\line example text1\line example text2\line example text3\line example text4\par
}

Answer 3

如果您使用段落寫入richtextbox，您可以使用如下所示的LineBreak（）相同代碼

Paragraph myParagraph = new Paragraph();
FlowDocument myFlowDocument = new FlowDocument();

// Add some Bold text to the paragraph
myParagraph.Inlines.Add(new Bold(new Run(@"Test Description:")));
myParagraph.Inlines.Add(new LineBreak()); // to add a new line use LineBreak()
myParagraph.Inlines.Add(new Run("my text"));
myFlowDocument.Blocks.Add(myParagraph);
myrichtextboxcontrolid.Document = myFlowDocument;

希望這可以幫助！