C＃使用PdfSharp从PDF提取文本

问题描述

是否可以使用PdfSharp从PDF文件中提取纯文本？
由于许可证，我不想使用iTextSharp。

Is there a possibility to extract plain text from a PDF-File with PdfSharp?I don't want to use iTextSharp because of its license.

推荐答案

以Sergio的答案为基础，并提出了一些扩展方法。我还将字符串的累积更改为迭代器。

Took Sergio's answer and made some extension methods. I also changed the accumulation of strings into an iterator.

public static class PdfSharpExtensions
{
    public static IEnumerable<string> ExtractText(this PdfPage page)
    {
        var content = ContentReader.ReadContent(page);
        var text = content.ExtractText();
        return text;
    }

    public static IEnumerable<string> ExtractText(this CObject cObject)
    {
        if (cObject is COperator)
        {
            var cOperator = cObject as COperator;
            if (cOperator.OpCode.Name== OpCodeName.Tj.ToString() ||
                cOperator.OpCode.Name == OpCodeName.TJ.ToString())
            {
                foreach (var cOperand in cOperator.Operands)
                    foreach (var txt in ExtractText(cOperand))
                        yield return txt;
            }
        }
        else if (cObject is CSequence)
        {
            var cSequence = cObject as CSequence;
            foreach (var element in cSequence)
                foreach (var txt in ExtractText(element))
                    yield return txt;
        }
        else if (cObject is CString)
        {
            var cString = cObject as CString;
            yield return cString.Value;
        }
    }
}

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