C#WPF将粘贴在richtextbox中的位图图像转换为二进制

我有一个richtextbox，我计划保存到一个数据库，可以加载回同一个richtextbox。我已经让它工作了，这样我就可以将flowdocument保存为DataFormats.XamlPackage，它可以保存图像，但问题是文本不可搜索。使用DataFormats.Xaml，我当然得到了文本，但没有图像。最终用户将粘贴图像，而不是应用程序中包含的图像

我尝试使用XamlWriter将文本转换为XML，然后分别从文档中获取图像并将其作为二进制文件插入XML，但我似乎找不到将图像转换为二进制文件的方法

有人对如何将图像与文本分开，转换成二进制有什么想法吗

提前谢谢

GetImageByteArray（）就是问题所在

代码：

更新

我想我可能最终找到了一个解决方案，我将在下面发布。它使用BmpBitmapEncoder和BmpBitmapDecoder。这允许我从位图图像中获取二进制文件，将其存储到数据库中，然后将其加载并显示到FlowDocument中。初步测试证明是成功的。出于测试目的，我绕过了数据库步骤，基本上通过创建二进制文件来复制图像，然后将二进制文件转换为新图像并添加到FlowDocument中。唯一的问题是，当我尝试使用修改后的FlowDocument并使用XamlWriter.Save函数时，新创建的映像上出现了错误，“无法序列化非公共类型”System.Windows.Media.Imaging.BitmapFrameDecode。这需要进一步调查。不过，我现在得把它放在一边了

private void SaveXML()
        {
            TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
            FlowDocument flowDocument = richTextBox.Document;

            string s = GetImagesXML(flowDocument);//temp
            LoadImagesIntoXML(s);

                using (StringWriter stringwriter = new StringWriter())
                {
                    using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
                    {
                        XamlWriter.Save(flowDocument, writer );//Throws error here
                    }

                }
}

private string GetImagesXML(FlowDocument flowDocument)
        {
            string s= "";

            using (StringWriter stringwriter = new StringWriter())
            {


                    Type inlineType;
                    InlineUIContainer uic;
                    System.Windows.Controls.Image replacementImage;
                    byte[] bytes;
                    BitmapImage bi;

                    //loop through replacing images in the flowdoc with the byte versions
                    foreach (Block b in flowDocument.Blocks)
                    {
                        foreach (Inline i in ((Paragraph)b).Inlines)
                        {
                            inlineType = i.GetType();

                            if (inlineType == typeof(Run))
                            {
                                //The inline is TEXT!!!
                            }
                            else if (inlineType == typeof(InlineUIContainer))
                            {
                                //The inline has an object, likely an IMAGE!!!
                                uic = ((InlineUIContainer)i);

                                //if it is an image
                                if (uic.Child.GetType() == typeof(System.Windows.Controls.Image))
                                {
                                    //grab the image
                                    replacementImage = (System.Windows.Controls.Image)uic.Child;
                                    bi = (BitmapImage)replacementImage.Source;

                                    //get its byte array
                                    bytes = GetImageByteArray(bi);

                                    s = Convert.ToBase64String(bytes);//temp
                                }
                            }
                        }
                    }

                return s;
            }
        }

private byte[] GetImageByteArray(BitmapImage src)
        {
                MemoryStream stream = new MemoryStream();
                BmpBitmapEncoder encoder = new BmpBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create((BitmapSource)src));
                encoder.Save(stream);
                stream.Flush();
            return stream.ToArray();
        }


private void LoadImagesIntoXML(string xml)
        {


            byte[] imageArr = Convert.FromBase64String(xml);
System.Windows.Controls.Image img = new System.Windows.Controls.Image()

MemoryStream stream = new MemoryStream(imageArr);
            BmpBitmapDecoder decoder = new BmpBitmapDecoder(stream, BitmapCreateOptions.None, BitmapCacheOption.Default);
            img.Source = decoder.Frames[0];
            img.Stretch = Stretch.None;

Paragraph p = new Paragraph();
            p.Inlines.Add(img);
            richTextBox.Document.Blocks.Add(p);
        }

---

将图像保存到MemoryStream并将该流写入XML文件

---

内存流将其转换为字节[]。

以下是我已经提出的两个建议的示例代码，如果我的示例不起作用，我将不得不研究有效负载问题

        // get raw bytes from BitmapImage using BaseUri and SourceUri
    private byte[] GetImageByteArray(BitmapImage bi)
    {
        byte[] result = new byte[0];
        string strImagePath = Path.Combine(Path.GetDirectoryName(bi.BaseUri.OriginalString), bi.UriSource.OriginalString);
        byte[] fileBuffer;
        using (FileStream fileStream = new FileStream(strImagePath, FileMode.Open))
        {
            fileBuffer = new byte[fileStream.Length];
            fileStream.Write(fileBuffer, 0, (int)fileStream.Length);
        }
        using (MemoryStream ms = new MemoryStream(fileBuffer))
        {
            XamlWriter.Save(bi, ms);
            //result = new byte[ms.Length];
            result = ms.ToArray();
        }
        return result;
    }
    // get raw bytes from BitmapImage using BitmapImage.CopyPixels
    private byte[] GetImageByteArray(BitmapSource bi)
    {
        int rawStride = (bi.PixelWidth * bi.Format.BitsPerPixel + 7) / 8;
        byte[] result = new byte[rawStride * bi.PixelHeight];
        bi.CopyPixels(result, rawStride, 0);
        return result;
    }
    private BitmapSource GetImageFromByteArray(byte[] pixelInfo, int height, int width)
    {
        PixelFormat pf = PixelFormats.Bgr32;
        int stride = (width * pf.BitsPerPixel + 7) / 8;
        BitmapSource image = BitmapSource.Create(width, height, 96, 96, pf, null, pixelInfo, stride);
        return image;
    }

---

好消息。我不得不花一段时间做些别的事情，但这让我重新焕然一新。我很快意识到，我可以把我知道有效的东西结合起来。我怀疑这个解决方案会赢得任何奖项，但它是有效的。我知道我可以使用XamlReader将流程文档包装为文本，保留图像元素，但丢失图像数据。我还知道我可以使用XamlFormat将FlowDocument转换为二进制文件。所以我想到了获取FlowDocument，并使用我已经编写的一个函数对其进行迭代以查找图像，我获取每个图像，基本上克隆它并将克隆放入新的FlowDocument中。我使用现在包含单个图像的新FlowDocument，将其转换为二进制，然后使用生成的二进制，将其转换为base64字符串，并将其粘贴到原始FlowDocument中图像的tag属性中。这会将原始FlowDocument中的图像数据保留为文本。通过这种方式，我可以将带有图像数据（我称之为子字符串格式）的FlowDocument传递到XamlReader中，以获得可搜索的文本。当它从数据库中出来时，我会像往常一样从Xaml中取出FlowDocument，但随后会遍历每个图像，使用XamlFormat从标记属性中提取数据，然后创建另一个克隆图像以提供实际图像的源属性。我在下面提供了获取子字符串格式的步骤

/// <summary>
    /// Returns a FlowDocument in SearchableText UI Binary (SUB)String format.
    /// </summary>
    /// <param name="flowDocument">The FlowDocument containing images/UI formats to be converted</param>
    /// <returns>Returns a string representation of the FlowDocument with images in base64 string in image tag property</returns>
    private string ConvertFlowDocumentToSUBStringFormat(FlowDocument flowDocument)
    {
        //take the flow document and change all of its images into a base64 string
        FlowDocument fd = TransformImagesTo64(flowDocument);

        //apply the XamlWriter to the newly transformed flowdocument
        using (StringWriter stringwriter = new StringWriter())
        {
            using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
            {
                XamlWriter.Save(flowDocument, writer);
            }
            return stringwriter.ToString();
        }
    }

    /// <summary>
    /// Returns a FlowDocument with images in base64 stored in their own tag property
    /// </summary>
    /// <param name="flowDocument">The FlowDocument containing images/UI formats to be converted</param>
    /// <returns>Returns a FlowDocument with images in base 64 string in image tag property</returns>
    private FlowDocument TransformImagesTo64(FlowDocument flowDocument)
    {
        FlowDocument img_flowDocument;
        Paragraph img_paragraph;
        InlineUIContainer img_inline;
        System.Windows.Controls.Image newImage;
        Type inlineType;
        InlineUIContainer uic;
        System.Windows.Controls.Image replacementImage;

        //loop through replacing images in the flowdoc with the base64 versions
        foreach (Block b in flowDocument.Blocks)
        {
            //loop through inlines looking for images
            foreach (Inline i in ((Paragraph)b).Inlines)
            {
                inlineType = i.GetType();

                /*if (inlineType == typeof(Run))
                {
                    //The inline is TEXT!!! $$$$$ Kept in case needed $$$$$
                }
                else */if (inlineType == typeof(InlineUIContainer))
                {
                    //The inline has an object, likely an IMAGE!!!
                    uic = ((InlineUIContainer)i);

                    //if it is an image
                    if (uic.Child.GetType() == typeof(System.Windows.Controls.Image))
                    {
                        //grab the image
                        replacementImage = (System.Windows.Controls.Image)uic.Child;

                        //create a new image to be used to get base64
                        newImage = new System.Windows.Controls.Image();
                        //clone the image from the image in the flowdocument
                        newImage.Source = replacementImage.Source;

                        //create necessary objects to obtain a flowdocument in XamlFormat to get base 64 from
                        img_inline = new InlineUIContainer(newImage);
                        img_paragraph = new Paragraph(img_inline);
                        img_flowDocument = new FlowDocument(img_paragraph);

                        //Get the base 64 version of the XamlFormat binary
                        replacementImage.Tag = TransformImageTo64String(img_flowDocument);
                    }
                }
            }
        }
        return flowDocument;
    }

    /// <summary>
    /// Takes a FlowDocument containing a SINGLE Image, and converts to base 64 using XamlFormat
    /// </summary>
    /// <param name="flowDocument">The FlowDocument containing a SINGLE Image</param>
    /// <returns>Returns base 64 representation of image</returns>
    private string TransformImageTo64String(FlowDocument flowDocument)
    {
        TextRange documentTextRange = new TextRange(flowDocument.ContentStart, flowDocument.ContentEnd);
        using (MemoryStream ms = new MemoryStream())
        {
            documentTextRange.Save(ms, DataFormats.XamlPackage);
            ms.Position = 0;
            return Convert.ToBase64String(ms.ToArray());
        }
    }

//
///以SearchableText UI二进制（子）字符串格式返回流文档。
/// 
///包含要转换的图像/UI格式的FlowDocument
///返回图像标记属性中图像为base64字符串的FlowDocument的字符串表示形式
私有字符串ConvertFlowDocumentToSubString格式（FlowDocument FlowDocument）
{
//获取流文档并将其所有图像更改为base64字符串
FlowDocument fd=TransformImagesTo64（FlowDocument）；
//将XamlWriter应用于新转换的flowdocument
使用（StringWriter StringWriter=new StringWriter（））
{
使用（System.Xml.XmlWriter writer=System.Xml.XmlWriter.Create（stringwriter））
{
XamlWriter.Save（flowDocument，writer）；
}
返回stringwriter.ToString（）；
}
}
/// 
///返回一个FlowDocument，其中base64中的图像存储在它们自己的标记属性中
/// 
///包含要转换的图像/UI格式的FlowDocument
///返回一个FlowDocument，其中图像在图像标记属性中以base 64字符串表示
私有FlowDocument TransformImagesTo64（FlowDocument FlowDocument）
{
流程文件img_流程文件；
第img_段；
INLINEUI容器img_inline；
System.Windows.Controls.Image新建图像；
类型inlineType；
inlineuic；
System.Windows.Controls.Image replacementImage；
//循环使用base64版本替换flowdoc中的图像
foreach（flowDocument.Blocks中的块b）
{
//通过内联线循环查找图像
foreach（内联i in（（段落）b）.内联）
{
inlineType=i.GetType（）；
/*if（inlineType==typeof（Run））
{
//内联为文本！！！$$$$$$保留以备需要$$$$$
}
else*/if（inlineType==typeof（InlineUIContainer））
{
//内联有一个对象，可能是一个图像！！！
uic=（（InlineUIContainer）i）；
//如果是图像
if（uic.Child.GetType（）==typeof（System.Windows.Controls.Image））
{
//抓住图像
replacementImage=（System.Windows.Controls.Image）uic.Child；
//创建用于获取base64的新映像
newImage=new
/// <summary>
    /// Returns a FlowDocument in SearchableText UI Binary (SUB)String format.
    /// </summary>
    /// <param name="flowDocument">The FlowDocument containing images/UI formats to be converted</param>
    /// <returns>Returns a string representation of the FlowDocument with images in base64 string in image tag property</returns>
    private string ConvertFlowDocumentToSUBStringFormat(FlowDocument flowDocument)
    {
        //take the flow document and change all of its images into a base64 string
        FlowDocument fd = TransformImagesTo64(flowDocument);

        //apply the XamlWriter to the newly transformed flowdocument
        using (StringWriter stringwriter = new StringWriter())
        {
            using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
            {
                XamlWriter.Save(flowDocument, writer);
            }
            return stringwriter.ToString();
        }
    }

    /// <summary>
    /// Returns a FlowDocument with images in base64 stored in their own tag property
    /// </summary>
    /// <param name="flowDocument">The FlowDocument containing images/UI formats to be converted</param>
    /// <returns>Returns a FlowDocument with images in base 64 string in image tag property</returns>
    private FlowDocument TransformImagesTo64(FlowDocument flowDocument)
    {
        FlowDocument img_flowDocument;
        Paragraph img_paragraph;
        InlineUIContainer img_inline;
        System.Windows.Controls.Image newImage;
        Type inlineType;
        InlineUIContainer uic;
        System.Windows.Controls.Image replacementImage;

        //loop through replacing images in the flowdoc with the base64 versions
        foreach (Block b in flowDocument.Blocks)
        {
            //loop through inlines looking for images
            foreach (Inline i in ((Paragraph)b).Inlines)
            {
                inlineType = i.GetType();

                /*if (inlineType == typeof(Run))
                {
                    //The inline is TEXT!!! $$$$$ Kept in case needed $$$$$
                }
                else */if (inlineType == typeof(InlineUIContainer))
                {
                    //The inline has an object, likely an IMAGE!!!
                    uic = ((InlineUIContainer)i);

                    //if it is an image
                    if (uic.Child.GetType() == typeof(System.Windows.Controls.Image))
                    {
                        //grab the image
                        replacementImage = (System.Windows.Controls.Image)uic.Child;

                        //create a new image to be used to get base64
                        newImage = new System.Windows.Controls.Image();
                        //clone the image from the image in the flowdocument
                        newImage.Source = replacementImage.Source;

                        //create necessary objects to obtain a flowdocument in XamlFormat to get base 64 from
                        img_inline = new InlineUIContainer(newImage);
                        img_paragraph = new Paragraph(img_inline);
                        img_flowDocument = new FlowDocument(img_paragraph);

                        //Get the base 64 version of the XamlFormat binary
                        replacementImage.Tag = TransformImageTo64String(img_flowDocument);
                    }
                }
            }
        }
        return flowDocument;
    }

    /// <summary>
    /// Takes a FlowDocument containing a SINGLE Image, and converts to base 64 using XamlFormat
    /// </summary>
    /// <param name="flowDocument">The FlowDocument containing a SINGLE Image</param>
    /// <returns>Returns base 64 representation of image</returns>
    private string TransformImageTo64String(FlowDocument flowDocument)
    {
        TextRange documentTextRange = new TextRange(flowDocument.ContentStart, flowDocument.ContentEnd);
        using (MemoryStream ms = new MemoryStream())
        {
            documentTextRange.Save(ms, DataFormats.XamlPackage);
            ms.Position = 0;
            return Convert.ToBase64String(ms.ToArray());
        }
    }