I have links in a SharePoint Online site page that I would like to retrieve and modify from within a C# application. I have been successful in using the SharePointPnPCoreOnline NuGet package to change links within a ClientSideText object, but I am stuck when I try to do the same with a ClientSideWebPart object. I can read the HTML (via the HtmlPropertiesData property) but I can't update it because it is a read-only property.

Any suggestions on how this can be done?

  • I havent tried it, but can you use GetPublicInstancePropertyValue and SetPublicInstancePropertyValue method to get the HTML content and update the link and set it back? Jun 5, 2019 at 22:49
  • I tried, but the SetPublicInstancePropertyValue method threw an exception "Property set method not found".
    – Steve
    Jun 6, 2019 at 17:43
  • Is there another way to do what I am asking? ...possibly by not using the SharePoint PnP Core library?
    – Steve
    Jun 24, 2019 at 18:30
  • Can you let me know, what you already have and what are trying to achieve using code? Maybe I can figure out another way or workaround. Jun 24, 2019 at 20:49
  • See my solution below.
    – Steve
    Oct 16, 2019 at 20:09

1 Answer 1


I was able to get this to work using the following steps:

  1. Get a JSON object from the ServerProcessedContent property.
JObject jsonObject = clientSideWebPart.ServerProcessedContent;
  1. Update the object with my changes.
jsonObject[@"imageSources"][@"imageURL"] = imageSourcesImageUrl;
  1. Set the PropertiesJson property to the JSON object's text (call ToString()).
string json = jsonObject.ToString();
clientSideWebPart.PropertiesJson = json;

These was certainly not intuitive. I had to read through the SharePointPnPCoreOnline library's code to understand what needed to be done.

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