c＃HttpClient上传文件到spring rest服务(c# HttpClient upload file to spring rest service)

 添加SdtContentText类型的新子元素确实是解决方案。 
 
 我正在使用OpenXML Power Tools 。 
 
 以下代码取自此处 ： 
 
public static class ContentControlExtensions
{
    public static IEnumerable<OpenXmlElement> ContentControls(
        this OpenXmlPart part)
    {
        return part.RootElement
            .Descendants()
            .Where(e => e is SdtBlock || e is SdtRun);
    }

    public static IEnumerable<OpenXmlElement> ContentControls(
        this WordprocessingDocument doc)
    {
        foreach (var cc in doc.MainDocumentPart.ContentControls())
            yield return cc;
    }
}
 
 接着 ： 
 
    using (WordprocessingDocument doc =
                 WordprocessingDocument.Open(sourceFile, true))
    {
        foreach (var cc in doc.ContentControls())
        {
            SdtProperties props = cc.Elements<SdtProperties>().FirstOrDefault();
            Tag tag = props.Elements<Tag>().FirstOrDefault();
            SdtContentText text = props.Elements<SdtContentText>().FirstOrDefault();
            if (text == null)
            {
                text = new SdtContentText();
                text.MultiLine = new OnOffValue(true);
                cc.AppendChild<SdtContentText>(text);
            }
            if (tag != null)
                Console.WriteLine(tag.Val);
        }

        doc.MainDocumentPart.Document.Save();
    }

Adding a new child element of type SdtContentText is indeed the solution.
 
I'm using the OpenXML Power Tools.
 
The following code is taken from here :
 
public static class ContentControlExtensions
{
    public static IEnumerable<OpenXmlElement> ContentControls(
        this OpenXmlPart part)
    {
        return part.RootElement
            .Descendants()
            .Where(e => e is SdtBlock || e is SdtRun);
    }

    public static IEnumerable<OpenXmlElement> ContentControls(
        this WordprocessingDocument doc)
    {
        foreach (var cc in doc.MainDocumentPart.ContentControls())
            yield return cc;
    }
}
 
And then :
 
    using (WordprocessingDocument doc =
                 WordprocessingDocument.Open(sourceFile, true))
    {
        foreach (var cc in doc.ContentControls())
        {
            SdtProperties props = cc.Elements<SdtProperties>().FirstOrDefault();
            Tag tag = props.Elements<Tag>().FirstOrDefault();
            SdtContentText text = props.Elements<SdtContentText>().FirstOrDefault();
            if (text == null)
            {
                text = new SdtContentText();
                text.MultiLine = new OnOffValue(true);
                cc.AppendChild<SdtContentText>(text);
            }
            if (tag != null)
                Console.WriteLine(tag.Val);
        }

        doc.MainDocumentPart.Document.Save();
    }