代码修改后的版本，全部提交

COSXML/Auth/QCloudCredentialProvider.cs

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+using System;
+
+using System.Text;
+using COSXML.Utils;
+using COSXML.CosException;
+using COSXML.Common;
+using COSXML.Log;
+using System.IO;
+/**
+* Copyright (c) 2018 Tencent Cloud. All rights reserved.
+* 11/9/2018 12:16:20 PM
+* bradyxiao
+*/
+namespace COSXML.Auth
+{
+
+    public abstract class QCloudCredentialProvider
+    {
+        public abstract QCloudCredentials GetQCloudCredentials();
+
+        public abstract void Refresh();
+    }
+
+    /// <summary>
+    /// 通过 云 api
+    /// </summary>
+    public class DefaultQCloudCredentialProvider : QCloudCredentialProvider
+    {
+        private string secretId;
+
+        private string secretKey;
+
+        private long keyTimDuration;
+
+        public DefaultQCloudCredentialProvider(string secretId, string secretKey, long keyDurationSecond)
+        {
+            this.secretId = secretId;
+            this.secretKey = secretKey;
+            this.keyTimDuration = keyDurationSecond;
+        }
+
+        public override QCloudCredentials GetQCloudCredentials()
+        {
+            long keyStartTime = TimeUtils.GetCurrentTime(TimeUnit.SECONDS);
+            long keyEndTime = keyStartTime + keyTimDuration;
+            string keyTime = String.Format("{0};{1}", keyStartTime, keyEndTime);
+            if (secretId == null) throw new CosClientException((int)CosClientError.INVALID_CREDENTIALS, "secretId == null");
+            if (secretKey == null) throw new CosClientException((int)CosClientError.INVALID_CREDENTIALS, "secretKey == null");
+            string signKey = DigestUtils.GetHamcSha1ToHexString(keyTime, Encoding.UTF8, secretKey, Encoding.UTF8);
+            return new QCloudCredentials(secretId, signKey, keyTime);
+        }
+
+        public override void Refresh()
+        {
+            //TODO update value
+            QLog.D("DefaultQCloudCredentialProvider", "need to update QCloudCredentials");
+            //invoke SetSetQCloudCredential(string secretId, string secretKey, string keyTime)
+        }
+    }
+
+    /// <summary>
+    /// 通过 临时密钥
+    /// </summary>
+    public class DefaultSessionQCloudCredentialProvider : QCloudCredentialProvider
+    {
+        private string tmpSecretId;
+        private string tmpSecretKey;
+        private string keyTime;
+        private string token;
+
+        public DefaultSessionQCloudCredentialProvider(string tmpSecretId, string tmpSecretKey, long tmpExpiredTime, string sessionToken)
+            :this(tmpSecretId, tmpSecretKey, TimeUtils.GetCurrentTime(TimeUnit.SECONDS),tmpExpiredTime, sessionToken)
+        {
+        }
+
+        public DefaultSessionQCloudCredentialProvider(string tmpSecretId, string tmpSecretKey, long keyStartTimeSecond, long tmpExpiredTime, string sessionToken)
+        {
+            this.tmpSecretId = tmpSecretId;
+            this.tmpSecretKey = tmpSecretKey;
+            this.keyTime = String.Format("{0};{1}", keyStartTimeSecond, tmpExpiredTime);
+            this.token = sessionToken;
+        }
+
+        public override QCloudCredentials GetQCloudCredentials()
+        {
+            if (IsNeedUpdateNow()) Refresh();
+            if (tmpSecretId == null) throw new CosClientException((int)CosClientError.INVALID_CREDENTIALS, "secretId == null");
+            if (tmpSecretKey == null) throw new CosClientException((int)CosClientError.INVALID_CREDENTIALS, "secretKey == null");
+            if (keyTime == null) throw new CosClientException((int)CosClientError.INVALID_CREDENTIALS, "keyTime == null");
+            string signKey = DigestUtils.GetHamcSha1ToHexString(keyTime, Encoding.UTF8, tmpSecretKey, Encoding.UTF8);
+            return new SessionQCloudCredentials(tmpSecretId, signKey, token, keyTime);
+        }
+
+        public override void Refresh()
+        {
+            //TODO update value
+            QLog.D("DefaultSessionQCloudCredentialProvider", "need to update QCloudCredentials");
+            //invoke SetQCloudCredential(string tmpSecretId, string tmpSecretKey, string tmpkeyTime, string sessionToken)
+        }
+
+        public bool IsNeedUpdateNow()
+        {
+            if (String.IsNullOrEmpty(keyTime) || String.IsNullOrEmpty(tmpSecretId) || String.IsNullOrEmpty(tmpSecretKey) || String.IsNullOrEmpty(token))
+            {
+                return true;
+            }
+            int index = keyTime.IndexOf(';');
+            long endTime = -1L;
+            long.TryParse(keyTime.Substring(index + 1), out endTime);
+            long nowTime = TimeUtils.GetCurrentTime(TimeUnit.SECONDS);
+            if (endTime <= nowTime) return true;
+            return false;
+        }
+
+        /// <summary>
+        /// 直接复制临时密钥信息
+        /// </summary>
+        /// <param name="tmpSecretId">临时安全证书 Id</param>
+        /// <param name="tmpSecretKey">临时安全证书 Key</param>
+        /// <param name="tmpkeyTime">证书有效的期间</param>
+        /// <param name="sessionToken">token 值</param>
+        public void SetQCloudCredential(string tmpSecretId, string tmpSecretKey, string tmpkeyTime, string sessionToken)
+        {
+            this.tmpSecretId = tmpSecretId;
+            this.tmpSecretKey = tmpSecretKey;
+            this.token = sessionToken;
+            this.keyTime = tmpkeyTime;
+        }   
+    }
+
+
+}