细说 ASP.NET Cache 及其高级用法

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         /// <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

cache

 

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;

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         }

小程序码

 

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         }

使用httpclient获取aceess_token

 

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         }

获取微信小程序 使用httpclient