WPF(C#)中API返回RTF转纯文本失败求助

Let’s walk through the exact steps to turn your hex-encoded RTF into plain text for display in WPF—this should fix the issues you’ve been hitting.

Step 1: Convert Hex String to Valid RTF #

Your input is a hexadecimal representation of RTF bytes. First, we need to convert this hex string to a proper RTF string using the encoding specified in your RTF (ansicpg1252):

public static string HexToRtf(string hexString)
{
    // Strip leading "0x" if present
    hexString = hexString.TrimStart('0', 'x');
    
    // Convert hex to byte array
    byte[] rtfBytes = new byte[hexString.Length / 2];
    for (int i = 0; i < hexString.Length; i += 2)
    {
        rtfBytes[i / 2] = Convert.ToByte(hexString.Substring(i, 2), 16);
    }
    
    // Decode using the codepage specified in your RTF (1252)
    return Encoding.GetEncoding(1252).GetString(rtfBytes);
}

Step 2: Convert RTF to Plain Text #

WPF’s built-in RichTextBox can handle RTF parsing even if you don’t display it. We’ll use it in memory to extract plain text:

public static string RtfToPlainText(string rtf)
{
    using (var tempRichTextBox = new RichTextBox())
    {
        var textRange = new TextRange(tempRichTextBox.Document.ContentStart, tempRichTextBox.Document.ContentEnd);
        using (var reader = new StringReader(rtf))
        {
            textRange.Load(reader, DataFormats.Rtf);
        }
        return textRange.Text.Trim(); // Trim extra newlines/spaces from RTF formatting
    }
}

Step 3: Put It All Together #

Combine these methods to get your plain text and display it in your text control (note: WPF doesn’t have a TextView—I assume you mean TextBlock or TextBox):

// Your input hex RTF string
string hexRtf = "0x7B5C727466315C616E73695C616E7369637067313235325C64656666305C6465666C616E67313033337B5C666F6E7474626C7B5C66305C666E696C5C666368617273657430204D6963726F736F66742053616E732053657269663B7D7D5C766965776B696E64345C7563315C706172645C66305C667331382068656C6C6F5C70617220207D";

// Convert hex to RTF
string rtf = HexToRtf(hexRtf);

// Convert RTF to plain text
string plainText = RtfToPlainText(rtf);

// Display in your text control
yourTextBlock.Text = plainText; // Or yourTextBox.Text = plainText;

Why This Works #

• Hex Conversion: We use the exact codepage (1252) specified in your RTF, avoiding garbled text from mismatched encodings.
• RTF Parsing: WPF’s native TextRange class handles all RTF formatting rules, so you don’t have to manually parse complex RTF syntax.

Quick Troubleshooting #

• If you get junk text, double-check that your hex string has no invalid characters (like spaces or non-hex digits).
• For WPF TextBox, set AcceptsReturn="True" if you want to preserve line breaks from the RTF.

内容的提问来源于stack exchange，提问作者Nirav Joshi