// TODO: Remove recursion.
public static void WriteException(
this Utf8JsonWriter writer,
Exception?exception,
JsonSerializerOptions options
)
{
// Validate parameters.
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
// If there is no exception, write null.
if (exception == null)
{
// Write null.
writer.WriteNullValue();
// Get out.
return;
}
// Start writing the object.
writer.WriteStartObject();
// Write properties.
writer.WriteString(ExceptionPropertyInfo.Message, exception.Message, options);
writer.WriteString(ExceptionPropertyInfo.Source, exception.Source, options);
writer.WriteNumber(ExceptionPropertyInfo.HResult, exception.HResult, options);
writer.WriteString(ExceptionPropertyInfo.HelpLink, exception.HelpLink, options);
writer.WriteString(ExceptionPropertyInfo.StackTrace, exception.StackTrace, options);
// Write the property name.
writer.WritePropertyName(ExceptionPropertyInfo.Data, options);
// Write the data property.
JsonSerializer.Serialize(writer, exception.Data, options);
// Need to write the type shim. Write the meta property
writer.WritePropertyName("$Meta");
// Write all the type information.
Type type = exception.GetType();
// Write a new object.
writer.WriteStartObject();
// Write the type.
writer.WritePropertyName("Type");
// Write a new object.
writer.WriteStartObject();
// Write properties.
writer.WriteString(nameof(Type.Namespace), type.Namespace);
writer.WriteString(nameof(Type.FullName), type.FullName);
writer.WriteString(nameof(Type.AssemblyQualifiedName), type.AssemblyQualifiedName);
writer.WriteString(nameof(Type.Name), type.Name);
// Close the type then the meta object.
writer.WriteEndObject();
writer.WriteEndObject();
// Are there any properties which are assignable
// to exception or IEnumerable<Exception>?
// If so, write those. Cycle through the properties.
foreach (PropertyInfo propertyInfo in type.GetPropertiesWithPublicInstanceGetters())
{
// Is it assignable to exception?
if (Constant.ExceptionTypeInfo.IsAssignableFrom(propertyInfo.PropertyType))
{
// Write the property name.
writer.WritePropertyName(propertyInfo, options);
// Write the object.
writer.WriteException((Exception?)propertyInfo.GetValue(exception), options);
}
// If this is assignable to an IEnumerable<Exception> then
// get that.
else if (Constant.EnumerableExceptionTypeInfo.IsAssignableFrom(propertyInfo.PropertyType))
{
// Get the value.
var exceptions = (IEnumerable <Exception>?)propertyInfo.GetValue(exception);
// Write the property name.
writer.WritePropertyName(propertyInfo, options);
// Write the exception array.
writer.WriteExceptionArray(exceptions, options);
// Continue.
continue;
}
}
// Write the end of the object.
writer.WriteEndObject();
}