如何以编程方式读取和修改Hindi .rtf文件？

Question

I have a hindi RTF file with content like:

कोलकाता, 11 दिसंबर पश्चिम बंगाल के बर्दवान जिले में कक्षा नौ की एक छात्रा ने फांसी लगाकर आत्महत्या कर ली।

In my console application I want to read that RTF file and Change some content programatically.

I using streamreader to read the file but when converting to string it is producing the following output:

ÚUæCþUèØ-SßæS‰Ø

×Âý Ñ Sßæ§Ù Üê •¤è ¼ßæ ÂØæü# ×æ˜æ ×ð´ ãUôÙð •¤æ ¼æßæ

ÖæðÂæÜ, vv ç¼â¢ÕÚ (¥æ§ü°°Ù°â)Ð ×ŠØ Âý¼ðàæ ×ð´ Sßæ§Ù Üê ¥æñÚ ÇðU¢»ê âð ¥Õ Ì•¤ •¤§ü Üæð»æð´ •¤è ×æñÌ ãUæð ¿é•¤è ãñU ¥õÚU ¥SÂÌæÜ ×ð´ ç¿ç•¤ˆâ•¤èØ âéçßÏæ¥ô´ •¤è •¤×è •ð¤ âæÍ-âæÍ ¼ßæ¥ô´ •ð¤ ¥Öæß •ð¤ Öè ¥æÚUæð ܻÌð ÚãðU ãñU¢Ð

SßæS‰Ø çßÖæ» Ùð ãUæÜæ¢ç•¤ ØãU ¼æßæ 畤Øæ ãñU 畤 Úæ…Ø ×ð´ ×æñâ×è ÚUæð», Sßæ§Ù Üê •ð¤ ©Â¿æÚ •ð¤ çÜ° Âý¼ðàæ •ð¤ ¥SÂÌæÜæð´ ×ð´ ¥æßàØ•¤ ¼ßæ¥æð´ •¤æ ÂØæü# ÂýÕ¢Ï ç•¤Øæ »Øæ ãñUÐ

I have tried the windows form RichTextBox to read the RTF file, but it always show Invalid File Format.

So what will be the best possible solution to read and modify rtf file in C#

StreamReader sr = new StreamReader(fpath, Encoding.Default, true);
string s1 = sr.ReadToEnd();
sr.Close();

also tried

using (System.Windows.Forms.RichTextBox rtBox = new System.Windows.Forms.RichTextBox())
{
    // Get the contents of the RTF file. Note that when it is 
    // stored in the string, it is encoded as UTF-16. 
    string s = System.IO.File.ReadAllText(fpath);

    // Convert the RTF to plain text.
    rtBox.Rtf = s; // error file format invalid
    string plainText = rtBox.Text;
}

Answer 1

The RichTextBox control can load an RTF file directly , do not use StreamReader to read RTF file because it can contain a lot of Control Characters .

After loading the file to the RichTextBox , use the Text property to get the plain text of the file.

RichTextBox also has a SaveFile method to save the modified content to a file.