namespace System.ClientModel.Primitives { public abstract class PipelineRequestHeaders : IEnumerable<KeyValuePair<string, string>>, IEnumerable { public abstract void Add(string name, string value); public abstract void Set(string name, string value); public abstract bool Remove(string name); public abstract bool TryGetValue(string name, out string value); public abstract bool TryGetValues(string name, out IEnumerable<string> values); public abstract IEnumerator<KeyValuePair<string, string>> GetEnumerator(); protected PipelineRequestHeaders(); } }