首次推送

COSXML/Model/Object/HeadObjectRequest.cs

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+using System;
+using System.Collections.Generic;
+
+using System.Text;
+using COSXML.Common;
+
+namespace COSXML.Model.Object
+{
+    /// <summary>
+    /// 检索 对象 的 meta 信息数据
+    /// <see cref="https://cloud.tencent.com/document/product/436/7745"/>
+    /// </summary>
+    public sealed class HeadObjectRequest : ObjectRequest
+    {
+        public HeadObjectRequest(string bucket, string key)
+            : base(bucket, key)
+        {
+            this.method = CosRequestMethod.HEAD;
+        }
+        /// <summary>
+        /// 特定版本的对象
+        /// </summary>
+        /// <param name="versionId"></param>
+        public void SetVersionId(string versionId)
+        {
+            if (versionId != null)
+            {
+                SetQueryParameter(CosRequestHeaderKey.VERSION_ID, versionId);
+            }
+        }
+        /// <summary>
+        /// 当 Object 在指定时间后被修改，则返回对应 Object 的 meta 信息，否则返回 304
+        /// </summary>
+        /// <param name="ifModifiedSince"></param>
+        public void SetIfModifiedSince(string ifModifiedSince)
+        {
+            if (ifModifiedSince != null)
+            {
+                SetRequestHeader(CosRequestHeaderKey.IF_MODIFIED_SINCE, ifModifiedSince);
+            }
+        }
+
+    }
+}