PutObjectRequest request = new PutObjectRequest(bucket, key, srcPath);

JObject o = new JObject();
// 不返回原图
o["is_pic_info"] = 0;
JArray rules = new JArray();
JObject rule = new JObject();
rule["bucket"] = bucket;
rule["fileid"] = "desample_photo.jpg";
//处理参数，规则参见：https://www.tencentcloud.com/document/product/436/44879?from_cn_redirect=1
rule["rule"] = "imageMogr2/thumbnail/400x400";
rules.Add(rule);
o["rules"] = rules;

string ruleString = o.ToString(Formatting.None);
request.SetRequestHeader("Pic-Operations", ruleString);
//执行请求
PutObjectResult result = cosXml.PutObject(request);

JObject o = new JObject();
// 不返回原图
o["is_pic_info"] = 0;
JArray rules = new JArray();
JObject rule = new JObject();
rule["bucket"] = bucket;
rule["fileid"] = "desample_photo.jpg";
//处理参数，规则参见：https://www.tencentcloud.com/document/product/436/44879?from_cn_redirect=1
rule["rule"] = "imageMogr2/thumbnail/400x400";
rules.Add(rule);
o["rules"] = rules;
string ruleString = o.ToString(Formatting.None);

ImageProcessRequest request = new ImageProcessRequest(bucket, key, ruleString);
ImageProcessResult result = cosXml.ImageProcess(request);

GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key, localDir, localFileName);
//处理参数，这里的实例是格式转换为 TPG 图片，规则参见：https://www.tencentcloud.com/document/product/436/44879?from_cn_redirect=1
getObjectRequest.SetQueryParameter("imageMogr2/format/tpg", null);