细说 ASP.NET Cache 及其高级用法
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2023-01-11 16:48:09
持续更新 Cache记录 推荐博客:细说 ASP.NET Cache 及其高级用法 1 #region 缓存 2 3 /// 4 /// 设置Cache 5 /// 6 /// cache名称 7 /// ......
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cache记录
1 #region 缓存
2
3 /// <summary>
4 /// 设置cache
5 /// </summary>
6 /// <param name="key">cache名称</param>
7 /// <param name="value">cache值</param>
8 void setcachedata(string key, string value,datetime time)
9 {
10 cache cache = httpcontext.current.cache;
11 cache["test"] = 1;
12 cache.insert(key, value, null, time, cache.noslidingexpiration);
13 }
14
15 /// <summary>
16 /// 获取 cache
17 /// </summary>
18 /// <param name="key">cache值</param>
19 /// <returns></returns>
20 object getcachedata(string key)
21 {
22 cache cache = httpruntime.cache;
23 if (cache[key] != null)
24 {
25 return cache[key];
26 }
27 else
28 {
29 return "";
30 }
31 }
32
33 /// <summary>
34 /// 判断指定cache是否存在
35 /// </summary>
36 /// <param name="key"></param>
37 /// <returns></returns>
38 bool iscacheexits(string key)
39 {
40 cache s = httpruntime.cache;
41 return s[key] != null;
42 }
43
44 /// <summary>
45 /// 移除指定cache
46 /// </summary>
47 /// <param name="key">cache名称</param>
48 void removecachedata(string key)
49 {
50 cache cache = httpruntime.cache;
51 cache.remove(key);
52 }
53
54 /// <summary>
55 /// 移除所有cache
56 /// </summary>
57 void removeallcachedata()
58 {
59 cache cache = httpruntime.cache;
60 idictionaryenumerator cacheneunm = cache.getenumerator();
61 while (cacheneunm.movenext())
62 {
63 cache.remove(cacheneunm.key.tostring());
64 }
65 }
66 #endregion
获取微信access_token
1 class wxresult
2 {
3 public string access_token { get; set; }
4 public string expires_in { get; set; }
5 }
6
7
8 /// <summary>
9 /// 缓存的是整个微信返回的json,可以转换成对象获取access_token
10 /// </summary>
11 /// <returns></returns>
12 string getaccesstoken()
13 {
14 var appid = "";
15 var appresect = "";
16 //判断access_token是否存在
17 if (iscacheexits("access_token"))
18 {
19 return getcachedata("access_token").tostring();
20 }
21 else
22 {
23 var url =
24 $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appid}&secret={appresect}";
25 var accesstoken = httpgetvalue(url);
26 setcachedata("access_token",accesstoken,datetime.now.addhours(2));//这里缓存的是整个对象
27 return accesstoken;
28 }
29 }
30
31 /// <summary>
32 /// get方式请求 获取微信返回的json
33 /// </summary>
34 /// <param name="url"></param>
35 /// <returns></returns>
36 string httpgetvalue(string url)
37 {
38 //创建一个httpwebrequest
39 httpwebrequest webrequest = webrequest.createhttp(url);
40 //get 方式传输
41 webrequest.method = "get";
42 //获取返回
43 webresponse webresponse = webrequest.getresponse();
44 //从stramreader中读取返回的流
45 string streamreader = new streamreader(webresponse.getresponsestream(), encoding.utf8).readtoend();
46 return streamreader;
47 }
48
49 //调用
50 var accesstoken = getaccesstoken();
51 //需要引用newtonsoft.json
52 var wxres = jsonconvert.deserializeobject<wxresult>(accesstoken);
53 accesstoken = wxres.access_token;
获取微信小程序码
1 void htpppostvalue(string accesstoken)
2 {
3 var url = $"https://api.weixin.qq.com/wxa/getwxacode?access_token={accesstoken}";
4 httpwebrequest webrequest = webrequest.createhttp(url);
5 webrequest.method = "post";
6 string str = "{\"path\":\" path\",\"width\":1000}";
7 byte[] data = encoding.utf8.getbytes(str);
8 webrequest.contentlength = data.length;
9 stream outstream = webrequest.getrequeststream(); //写入的流
10 outstream.write(data, 0, data.length);
11 outstream.close();
12 httpwebresponse response = webrequest.getresponse() as httpwebresponse;
13 stream insstream = response.getresponsestream();
14 var imgname = datetime.now.millisecond + ".jpg";
15 var path = mappath("/content/" + imgname);
16 image img = image.fromstream(insstream);
17 img.save(path);
18 }
获取微信access_token 使用httpclient
1 string getaccesstokenwithhttpclient()
2 {
3 var appid = "自己appid";
4 var appresect = "自己appresect";
5 //实例化httpclient 对象
6 httpclient client = new httpclient();
7 var url =
8 $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appid}&secret={appresect}";
9 //使用getasybc(string url)方法异步获取httpresponsemessage .result使用的是同步方法
10 httpresponsemessage responesemessage = client.getasync(url).result;
11 client.dispose();
12 //返回的是一个json对象
13 return responesemessage.content.readasstringasync().result;
14 }
获取微信小程序码 使用httpclient
1 void postaccesstokenwithhttpclient(string accesstoken)
2 {
3 var url = $"https://api.weixin.qq.com/wxa/getwxacode?access_token={accesstoken}";
4 string str = "{\"path\":\" path\",\"width\":1000}";
5 //实例化httpclient 对象
6 httpclient client = new httpclient();
7 // 把需要传输的转换httpcontent 对象
8 httpcontent content = new stringcontent(str,encoding.utf8);
9 //使用postasync(string url, htppcontent content).result 获取返回的响应消息
10 httpresponsemessage response = client.postasync(url, content).result;
11 //从响应消息中获取返回的信息 使用result 同步方法
12 stream stream = response.content.readasstreamasync().result;
13 //二进制流转换成img
14 using (image img = image.fromstream(stream))
15 {
16 var imgname ="123哈哈"+ datetime.now.millisecond + ".jpg";
17 var path = mappath("/content/" + imgname);
18 img.save(path);
19 }
20
21 }