.NET

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var request = new FooRequest
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{
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    Id = "123",
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    AdditionalProperties =
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    {
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        ["extra1"] = new { value = 42 },
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        ["extra2"] = DateTime.Now,
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        ["extra3"] = 99
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    }
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};
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var response = await client.Foo.CreateAsync(request);
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Dictionary<string, JsonElement> jsonElements = response.AdditionalProperties.ToJsonElementDictionary();
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Dictionary<string, int> extra1 = jsonElements["extra1"].Deserialize<Dictionary<string, int>>();
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DateTime extra2 = jsonElements["extra2"].GetDateTime();
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int extra3 = jsonElements["extra3"].GetInt32();