Remove specific properties from JSON object

Question

I have a JSON:

{
    \"scbs_currentstatus\": \"\",
      \"scbs_primaryissue\": \"\",
      \"_umb_id\": \"Test\",
      \"_umb_creator\": \"Admin\",
      \         


        

Answer 1

You can parse the string first:

var temp =  JArray.Parse(json);
temp.Descendants()
    .OfType<JProperty>()
    .Where(attr => attr.Name.StartsWith("_umb_"))
    .ToList() // you should call ToList because you're about to changing the result, which is not possible if it is IEnumerable
    .ForEach(attr => attr.Remove()); // removing unwanted attributes
json = temp.ToString(); // backing result to json

UPDATE OR:

result.Properties()
    .Where(attr => attr.Name.StartsWith("_umb_"))
    .ToList()
    .ForEach(attr => attr.Remove());

UPDATE #2

You can specify more conditions in where clause:

.Where(attr => attr.Name.StartsWith("_umb_") && some_other_condition)

OR

.Where(attr => attr.Name.StartsWith("_umb_") || some_other_condition)

Or whatever you need.

Answer 2

I just ended up deserializing to JObject and recursively looping through that to remove unwanted fields. Here's the function for those interested.

private void removeFields(JToken token, string[] fields)
{
JContainer container = token as JContainer;
if (container == null) return;

List<JToken> removeList = new List<JToken>();
foreach (JToken el in container.Children())
{
    JProperty p = el as JProperty;
    string propertyName = p.hasOwnProperty(key);

    if (p != null && fields.Contains(p.propertyName) && p.propertyName.substring(0,4) == "_umb" )
    {
        removeList.Add(el);
    }
    removeFields(el, fields);
}

foreach (JToken el in removeList)
{
    el.Remove();
}
}