Creating MongoDB like update document in C#

Question

I am trying to create a MongoDB like update document in my C# code. This is not used to update the MongoDB but the API I am using expects the data in this format.

I tried using MongoDB.Driver NuGet package and tried to create the document like this.

class Program
{
    class MyTest
    {
        public string Name { get; set; } = String.Empty;
        public string Description { get; set; } = String.Empty;
    }

    public static void Main()
    {
        var v = Builders<MyTest>.Update
            .Set(t => t.Name , "TestName")
            .Set(t => t.Description ,"TestDescription");

    }
}

This code compiles and runs. But I need the output in string format. Something like:

$set: {Name:"TestName",Description:"TestDescription"}

Is there anyway to get a string representation like that?

see stackoverflow.com/questions/70958926/…

dododo
– dododo

2023-01-06 14:12:23 +00:00
Commented Jan 6, 2023 at 14:12 — dododo
– dododo, Commented Jan 6, 2023 at 14:12

Radu Hatos · Accepted Answer · 2023-01-06 14:11:07Z

1

This should work:

var output = v.Render(BsonSerializer.LookupSerializer<MyTest>(), new BsonSerializerRegistry());

This will render the Update document to a BsonValue.

answered Jan 6, 2023 at 14:11

Radu Hatos

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4 Comments

dododo Over a year ago

better to do the following:

var registry = BsonSerializer.SerializerRegistry; var serializer = registry.GetSerializer<MyTest>();   var rendered = v.Render(serializer, registry);

Radu Hatos Over a year ago

@dododo LookupSerializer() method does exactly what you wrote.

No Name Over a year ago

Awesome..works as expected.

dododo Over a year ago

@RaduHatos, no, it doesn't. In your case, you ignore predefined serializers

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