CODEWITHSUNDEEP
c#jsonmongodb
user1164558
user1164558

Reputation: 37

MongoDB C# Driver Saves Empty Properties

I have a C# object with about 500 properties, some of them complex types. The Json documents are imported via XML and it works 100%. I can also query the collection and successfully serialize the Json document into the C# object. The problem is that when I make a change to the object and use collection.Save(object); it creates Json properties for ALL of the C# properties even though they are NULL, so now my document looks like this:

    { 
    "_id" : "AA00001", 
    "Product" : {
        "Reference" : "AA00001", 
        "Type" : "02", 
        "Code" : null, 
        "Property 1" : null, 
        "Property 2" : null, 
        "Property 3" : null, 
    .
    .
    .   
}

The original document looked like this before the C# save

{ 
"_id" : "AA00001", 
"Product" : {
    "Reference" : "AA00001", 
    "Type" : "02"
.
.
.

Is there a way to tell the driver not to save the empty/null values?

Thank you.

Upvotes: 2

Views: 1458

Answers (1)

mnemosyn
mnemosyn

Reputation: 46311

You can do this by registering a ConventionPack:

var pack = new ConventionPack();
pack.Add(new IgnoreIfNullConvention(true));
ConventionRegistry.Register("ignore nulls",
                            pack,
                            t => true);

IgnoreIfNull will prevent the fields from being serialized. There's also a IgnoreIfDefaultConvention which also works for value types.

For more Details on how to register these, you might want to refer to another question here on SO.

Upvotes: 1

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