How to configure Swashbuckle to ignore property on model

Question

I\'m using Swashbuckle to generate swagger documentation\\UI for a webapi2 project. Our models are shared with some legacy interfaces so there are a couple of properties I

Answer 1

The code below is very much based on @Richard's answer, but I am including it as a new answer because it has three completely new, useful features which I have added:

• Runs on .NET Core on the latest version of Swashbuckle (v5)
• Allows the SwaggerIgnore attribute to be applied to fields not just to properties
• Handles the fact that property and field names may have been overridden using the JsonProperty attribute
• EDIT: Now correctly handles camelCasing of originally TitleCased fields or properties (prompted by @mattruma's answer)

So the revised code is:

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
public class SwaggerIgnoreAttribute : Attribute
{
}

internal static class StringExtensions
{
    internal static string ToCamelCase(this string value)
    {
        if (string.IsNullOrEmpty(value)) return value;
        return char.ToLowerInvariant(value[0]) + value.Substring(1);
    }
}

public class SwaggerIgnoreFilter : ISchemaFilter
{
    public void Apply(OpenApiSchema schema, SchemaFilterContext schemaFilterContext)
    {
        if (schema.Properties.Count == 0)
            return;

        const BindingFlags bindingFlags = BindingFlags.Public |
                                          BindingFlags.NonPublic |
                                          BindingFlags.Instance;
        var memberList = schemaFilterContext.SystemType
                            .GetFields(bindingFlags).Cast()
                            .Concat(schemaFilterContext.SystemType
                            .GetProperties(bindingFlags));

        var excludedList = memberList.Where(m =>
                                            m.GetCustomAttribute()
                                            != null)
                                     .Select(m =>
                                         (m.GetCustomAttribute()
                                          ?.PropertyName
                                          ?? m.Name.ToCamelCase()));

        foreach (var excludedName in excludedList)
        {
            if (schema.Properties.ContainsKey(excludedName))
                schema.Properties.Remove(excludedName);
        }
    }
}

and in Startup.cs:

services.AddSwaggerGen(c =>
{
    ...
    c.SchemaFilter();
    ...
});