HttpClient未授权401

Question

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", "");