代码修改后的版本，全部提交

COSXML/Model/Bucket/PutBucketLifecycleRequest.cs

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+using System;
+using System.Collections.Generic;
+
+using System.Text;
+using COSXML.Common;
+using COSXML.Model.Tag;
+using COSXML.Network;
+using COSXML.CosException;
+
+namespace COSXML.Model.Bucket
+{
+    /// <summary>
+    /// 设置 Bucket 生命周期
+    /// <see cref="https://cloud.tencent.com/document/product/436/8280"/>
+    /// </summary>
+    public sealed class PutBucketLifecycleRequest : BucketRequest
+    {
+        private LifecycleConfiguration lifecycleConfiguration;
+
+        public PutBucketLifecycleRequest(string bucket)
+            : base(bucket)
+        {
+            this.method = CosRequestMethod.PUT;
+            this.queryParameters.Add("lifecycle", null);
+            lifecycleConfiguration = new LifecycleConfiguration();
+            lifecycleConfiguration.rules = new List<LifecycleConfiguration.Rule>();
+            this.needMD5 = true;
+        }
+
+        public override Network.RequestBody GetRequestBody()
+        {
+            string content = Transfer.XmlBuilder.BuildLifecycleConfiguration(lifecycleConfiguration);
+            byte[] data = Encoding.UTF8.GetBytes(content);
+            ByteRequestBody body = new ByteRequestBody(data);
+            return body;
+        }
+
+        /// <summary>
+        /// 设置生命周期规则
+        /// <see cref="Model.Tag.LifecycleConfiguration.Rule"/>
+        /// </summary>
+        /// <param name="rule"></param>
+        public void SetRule(LifecycleConfiguration.Rule rule)
+        {
+            if(rule != null)
+            {
+                lifecycleConfiguration.rules.Add(rule);
+            }
+        }
+        /// <summary>
+        /// 设置生命周期规则
+        /// <see cref="Model.Tag.LifecycleConfiguration.Rule"/>
+        /// </summary>
+        /// <param name="rules"></param>
+        public void SetRules(List<LifecycleConfiguration.Rule> rules)
+        {
+            if (rules != null)
+            {
+                lifecycleConfiguration.rules.AddRange(rules);
+            }
+        }
+
+        public override void CheckParameters()
+        {
+            base.CheckParameters();
+            if (lifecycleConfiguration.rules.Count == 0) throw new CosClientException((int)CosClientError.INVALID_ARGUMENT, "lifecycleConfiguration.rules.Count = 0");
+        }
+    }
+}