我需要C＃HttpClient获取请求中OAuth 1.0的格式

OAuth 
**oauth_consumer_key**="123456",**oauth_signature_method**="HMACSHA1",**oauth_timestamp**="15872261099",**oauth_nonce**="eqIKvpgSs7ee",**oauth_version**="1.0",oauth_signature="bW5dnQV1W9nmaDwTtZwEjjAQ="

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization","");