StringTypeInfo.cs

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namespace System.Diagnostics.Tracing;
 
internal sealed class StringTypeInfo : TraceLoggingTypeInfo
{
    private static StringTypeInfo s_instance;
 
    public StringTypeInfo()
        : base(typeof(string))
    {
    }
 
    public static TraceLoggingTypeInfo Instance()
    {
        return s_instance ?? (s_instance = new StringTypeInfo());
    }
 
    public override void WriteMetadata(TraceLoggingMetadataCollector collector, string name, EventFieldFormat format)
    {
        if (name == null)
        {
            name = "message";
        }
        collector.AddNullTerminatedString(name, Statics.MakeDataType(TraceLoggingDataType.Utf16String, format));
    }
 
    public override void WriteData(PropertyValue value)
    {
        TraceLoggingDataCollector.AddNullTerminatedString((string)value.ReferenceValue);
    }
 
    public override object GetData(object value)
    {
        if (value == null)
        {
            return "";
        }
        return value;
    }
}