RichTextBox在Azure上抛出OutOfMemory [英] RichTextBox throws OutOfMemory on Azure

问题描述

我正在使用RichTextBox使用以下代码将RTF中的字符串转换为纯文本:

I'm using RichTextBox to convert a string in RTF to plain text, using this piece of code:

private string ConvertToText(string rtf)
{
    if (string.IsNullOrWhiteSpace(rtf)) return string.Empty;

    if (!rtf.Contains("{\\rtf")) return rtf.Trim();  

    using (var helper = new System.Windows.Forms.RichTextBox())
    {
        helper.Rtf = rtf;
        var plainText = helper.Text;

        if (string.IsNullOrWhiteSpace(plainText)) return string.Empty;

        return "<< Rule in Rich Text Format converted to Plain Text >>\n\n" 
            + plainText 
            + "\n\n<< Rule in Rich Text Format converted to Plain Text >>";
    }
}

它在所有开发人员计算机上都可以正常运行，但是在部署到Azure网站时不起作用:

It works OK on all developers machines, but it does not work when deployed to an Azure Web Site:

{
"$id"             :"1",
"Message"         :"An error has occurred.",
"ExceptionMessage":"Out of memory.",
"ExceptionType"   :"System.OutOfMemoryException",
"StackTrace"      :"   
    at System.Drawing.Graphics.FromHdcInternal(IntPtr hdc)\r\n   
    at System.Drawing.Font.GetHeight()\r\n   
    at System.Drawing.Font.get_Height()\r\n   
    at System.Windows.Forms.Control.get_FontHeight()\r\n   
    at System.Windows.Forms.TextBoxBase.get_PreferredHeight()\r\n   
    at System.Windows.Forms.TextBoxBase.AdjustHeight(Boolean returnIfAnchored)\r\n   
    at System.Windows.Forms.TextBoxBase.set_Multiline(Boolean value)\r\n   
    at System.Windows.Forms.RichTextBox.set_Multiline(Boolean value)\r\n   
    at System.Windows.Forms.RichTextBox..ctor()\r\n   
    at ... "
}

无论RTF字符串的大小如何，都会发生 .我已经在使用System.Windows.Forms引用的复制到本地"属性.有人在处理RTF和Azure方面有经验吗?是否有将RTF转换为纯文本的替代方法?

It happens no matter the size of the RTF string. I'm already using the "Copy to Local" property of the System.Windows.Forms reference. Does anyone have experience in dealing with RTF and Azure? Is there an alternative way to convert RTF to plain text?

推荐答案

这是此 C ++论坛链接:

public static string ConvertToText(string rtf)
{
    bool slash = false; //indicates if backslash followed by the space
    bool figure_opened = false; //indicates if opening figure brace followed by the space
    bool figure_closed = false; //indicates if closing brace followed by the space
    bool first_space = false; //the else spaces are in plain text and must be included to the result

    if (rtf.Length < 4) return string.Empty;

    int i = 0;
    i = rtf.IndexOf("\\pard");
    if (i < 1) return "";

    var builder = new StringBuilder();
    for (int j = i; j < rtf.Length - 1; j++)
    {
        char ch = rtf[j];
        char nextCh = rtf[j + 1];

        if (ch == '\\' && nextCh == 'p') // appends \n if \pard, except for first
        {
            if (j > i && j < rtf.Length - 4)
            {
                string fiveChars = rtf.Substring(j, 5);
                if (fiveChars.Equals("\\pard"))
                {
                    builder.Append("\n");
                }
            }
        }

        if (ch == '\\' && nextCh == 'u') // to deal correctly with special characters
        {
            string fourChars = rtf.Substring(j + 2, 4);
            string digits = new string(fourChars.TakeWhile(char.IsDigit).ToArray());
            char specialChar = (char)int.Parse(digits);
            builder.Append(specialChar);
            j += digits.Length + 5;
            continue;
        }

        if (ch == '\\' && nextCh == '{') // if the text contains symbol '{'
        {
            slash = false;
            figure_opened = false;
            figure_closed = false;
            first_space = false;
            builder.Append('{');
            j++;
            continue;
        }
        else if (ch == '\\' && nextCh == '}') // if the text contains symbol '}'
        {
            slash = false;
            figure_opened = false;
            figure_closed = false;
            first_space = false;
            builder.Append('}');
            j++;
            continue;
        }
        else if (ch == '\\' && nextCh == '\\') // if the text contains symbol '\'
        {
            slash = false;
            figure_opened = false;
            figure_closed = false;
            first_space = false;
            builder.Append('\\');
            j++;
            continue;
        }
        else if (ch == '\\') // we are looking at the backslash
        {
            first_space = true;
            slash = true;
        }
        else if (ch == '{')
        {
            first_space = true;
            figure_opened = true;
        }
        else if (ch == '}')
        {
            first_space = true;
            figure_closed = true;
        }
        else if (ch == ' ')
        {
            slash = false;
            figure_opened = false;
            figure_closed = false;
        }

        if (!slash && !figure_opened && !figure_closed)
        {
            if (!first_space)
            {
                builder.Append(ch);
            }
            else
            {
                first_space = false;
            }
        }
    }
    return builder.ToString();
}

有效！ = D

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