How to Selectively Override JsonProperty Attributes for Customized JSON Serialization in ASP.NET MVC?

Flexibly control JsonProperty attributes to implement ASP.NET MVC custom JSON serialization

In ASP.NET MVC applications using Json.Net, developers often use the [JsonProperty(PropertyName = "shortName")] attribute to reduce the amount of data during JSON serialization. This approach works well for .NET clients, but browser-based clients will have problems using abbreviated property names.

To solve this problem, you can use a custom contract parser to dynamically ignore the [JsonProperty()] attribute during serialization. Here’s how:

Custom contract parser

<code class="language-csharp">class LongNameContractResolver : DefaultContractResolver
{
    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        var list = base.CreateProperties(type, memberSerialization);

        foreach (JsonProperty prop in list)
        {
            prop.PropertyName = prop.UnderlyingName;
        }

        return list;
    }
}</code>

Toggle attribute suppression

To selectively ignore the [JsonProperty()] attribute during serialization, you can conditionally set the JsonSerializerSettings attribute of ContractResolver. An example is as follows:

<code class="language-csharp">JsonSerializerSettings settings = new JsonSerializerSettings
{
    Formatting = Formatting.Indented
};

if (useLongNames)
{
    settings.ContractResolver = new LongNameContractResolver();
}

string jsonString = JsonConvert.SerializeObject(obj, settings);</code>

By setting the useLongNames flag, you can control whether the [JsonProperty()] attribute is ignored and longer attribute names are used for serialization. This provides fine-grained control over JSON output based on specific client needs.

Example output

Consider the following example:

<code class="language-csharp">Foo foo = new Foo
{
    CustomerNumber = "BG60938",
    CustomerName = "Bubba Gump Shrimp Company"
};

Console.WriteLine("--- 使用JsonProperty名称 ---");
Console.WriteLine(Serialize(foo, false));
Console.WriteLine();
Console.WriteLine("--- 忽略JsonProperty名称 ---");
Console.WriteLine(Serialize(foo, true));</code>

Output:

<code>--- 使用JsonProperty名称 ---
{
  "cust-num": "BG60938",
  "cust-name": "Bubba Gump Shrimp Company"
}

--- 忽略JsonProperty名称 ---
{
  "CustomerNumber": "BG60938",
  "CustomerName": "Bubba Gump Shrimp Company"
}</code>

By dynamically overriding the [JsonProperty()] attribute, you can customize the JSON serialization process to optimize the amount of data for a specific client while maintaining a consistent object hierarchy for other clients.

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