使用itex sharp 1.4.6.0版在PDFfile中添加单选按钮

我写这段代码是为了创建单选按钮

 SizeF size = new SizeF(FieldBound.Width / 2, FieldBound.Height / 2);
                            PdfContentByte contentByte = PDFStamper.GetOverContent(item.PageNumber);
                            PdfAppearance[] radioButtonStates = new PdfAppearance[2];

                            radioButtonStates[0] = contentByte.CreateAppearance(FieldBound.Width, FieldBound.Height);
                            radioButtonStates[0].Circle(size.Width, size.Height, size.Width <= size.Height ? size.Width - 1 : size.Height - 1);
                            radioButtonStates[0].Stroke();

                            radioButtonStates[1] = contentByte.CreateAppearance(FieldBound.Width, FieldBound.Height);
                            radioButtonStates[1].Circle(size.Width, size.Height, size.Width <= size.Height ? size.Width - 1 : size.Height - 1);
                            radioButtonStates[1].Stroke();
                            radioButtonStates[1].Circle(size.Width, size.Height, size.Width <= size.Height ? (size.Width / 2) - 1 : (size.Height / 2) - 1);
                            radioButtonStates[1].FillStroke();

                            PdfFormField radioButton = PdfFormField.CreateRadioButton(PDFStamper.Writer, false);
                            radioButton.FieldName = (string.IsNullOrEmpty(item.GroupName) ? item.Name : item.GroupName);
                            radioButton.UserName = item.ToolTip;
                            radioButton.Rect = FieldBound;

                            radioButton.DefaultValueAsString = (item.Value.ToLower() == "true" ? "Yes" : "No");

                            if (item.ReadOnly)
                                radioButton.SetFieldFlags(BaseField.READ_ONLY);

                            if (item.Required)
                                radioButton.SetFieldFlags(BaseField.REQUIRED);

                            radioButton.Flags = PdfFormField.FLAGS_PRINT;

                            radioButton = SetRadioButtonAppearance(PDFStamper.Writer, FieldBound, radioButton, radioButtonStates, true);

                            PDFStamper.AddAnnotation(radioButton, item.PageNumber);

“是”单选按钮是在我打开pdf文件时创建的，它显示此错误 编辑PDF将导致PDF不再符合PDF/a，是否确实要继续 注意：如果编辑完成后需要PDF/A格式，请确保使用“保存文件->另存为其他->PDF/A”

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有人能帮我解决我所缺少的问题吗

您使用的iTextSharp版本的日期是2006年10月。除了该版本存在的技术和法律问题外，您还应该使用使用将近9年的软件。请升级。只是为了进一步补充Bruno的评论，PDF/A规范发布时才刚刚一年，所以据我所知，您的版本甚至都不知道。根据PDF/A-1在2.0.5版中添加。

   private PdfFormField SetRadioButtonAppearance(PdfWriter Writer,       iTextSharp.text.Rectangle Rectangle, PdfFormField RadioButtonField, PdfAppearance[] OnOff, bool On)
    {

        PdfFormField Field = PdfFormField.CreateRadioButton(Writer,true);
        Field.Flags = PdfFormField.FLAGS_PRINT;
        Field.SetWidget(Rectangle, PdfAnnotation.HIGHLIGHT_INVERT);

        if (On)
            Field.AppearanceState = "0";
        else
            Field.AppearanceState = "Off";

        Field.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, "0", OnOff[1]);
        Field.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, "Off", OnOff[0]);
        Field.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, "On", OnOff[0]);

        Field.SetAppearance(PdfAnnotation.APPEARANCE_DOWN, "0", OnOff[1]);
        Field.SetAppearance(PdfAnnotation.APPEARANCE_DOWN, "Off", OnOff[0]);
        Field.SetAppearance(PdfAnnotation.APPEARANCE_DOWN, "On", OnOff[0]);

        RadioButtonField.AddKid(Field);

        return RadioButtonField;

    }