[C ＃] commonly used utils

Preface

When we are developing a project, we may encounter some problems to obtain the screen width ,dp px The mutual transformation of , Of course, we can't copy and paste every time we use it . At this time, we need a sharp weapon - Tool class . This tool class contains some of our common methods , In one word, we can get the desired results , It not only simplifies our code, but also saves us valuable time . meanwhile , A good software engineer , Universal tools are his magic weapon to protect himself .（ This paragraph is quoted from ：Android Project development must -Utils Establishment and use of class ）

Code display

Base64 decode :

        /// <summary>
        /// Base64 decode 
        /// </summary>
        /// <param name="s"> Need to decode string </param>
        /// <returns></returns>
        public static string Decode(string s)
        {
            byte[] outputb = Convert.FromBase64String(s);
            return Encoding.Default.GetString(outputb);
        }

Base64 code :

        /// <summary>
        /// Base64 code 
        /// </summary>
        /// <param name="s"> Need to encode string </param>
        /// <returns></returns>
        public static string EncodeByUTF8(string s)
        {
            System.Text.Encoding encode = System.Text.Encoding.UTF8;
            byte[] bytedata = encode.GetBytes(s);
            return Convert.ToBase64String(bytedata, 0, bytedata.Length);
        }

Deep copy ：

UserInfo newInfo = JsonSerializer.Deserialize<UserInfo>(JsonSerializer.Serialize(info));

http Tool class ：

 public class HttpHelper
    {
        /// <summary>
        ///  launch POST Synchronization request 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers"> Fill in the message header </param>        
        /// <returns></returns>
        public static string HttpPost(string url, string postData = null, string contentType = "application/json", int timeOut = 30, Dictionary<string, string> headers = null)
        {
            postData = postData ?? "";
            using (HttpClient client = new HttpClient())
            {
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                using (HttpContent httpContent = new StringContent(postData, Encoding.UTF8))
                {
                    if (contentType != null)
                        httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
 
                    HttpResponseMessage response = client.PostAsync(url, httpContent).Result;
                    return response.Content.ReadAsStringAsync().Result;
                }
            }
        }
 
 
        /// <summary>
        ///  launch POST Asynchronous requests 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers"> Fill in the message header </param>        
        /// <returns></returns>
        public static async Task<string> HttpPostAsync(string url, string postData = null, string contentType = "application/json", int timeOut = 30, Dictionary<string, string> headers = null)
        {
            postData = postData ?? "";
            using (HttpClient client = new HttpClient())
            {
                client.Timeout = new TimeSpan(0, 0, timeOut);
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                using (HttpContent httpContent = new StringContent(postData, Encoding.UTF8))
                {
                    if (contentType != null)
                        httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
 
                    HttpResponseMessage response = await client.PostAsync(url, httpContent);
                    return await response.Content.ReadAsStringAsync();
                }
            }
        }
 
        /// <summary>
        ///  launch GET Synchronization request 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="headers"></param>
        /// <param name="contentType"></param>
        /// <returns></returns>
        public static string HttpGet(string url, string contentType = "application/json", Dictionary<string, string> headers = null)
        {
            using (HttpClient client = new HttpClient())
            {
                if (contentType != null)
                    client.DefaultRequestHeaders.Add("ContentType", contentType);
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                HttpResponseMessage response = client.GetAsync(url).Result;
                return response.Content.ReadAsStringAsync().Result;
            }
        }
 
        /// <summary>
        ///  launch GET Asynchronous requests 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="headers"></param>
        /// <param name="contentType"></param>
        /// <returns></returns>
        public static async Task<string> HttpGetAsync(string url, string contentType = "application/json", Dictionary<string, string> headers = null)
        {
            using (HttpClient client = new HttpClient())
            {
                if (contentType != null)
                    client.DefaultRequestHeaders.Add("ContentType", contentType);
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                HttpResponseMessage response = await client.GetAsync(url);
                return await response.Content.ReadAsStringAsync();
            }
        }
 
 
 
        /// <summary>
        ///  launch POST Synchronization request 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers"> Fill in the message header </param>        
        /// <returns></returns>
        public static T HttpPost<T>(string url, string postData = null, string contentType = "application/json", int timeOut = 30, Dictionary<string, string> headers = null)
        {
            return HttpPost(url, postData, contentType, timeOut, headers).ToEntity<T>();
        }
 
 
        /// <summary>
        ///  launch POST Asynchronous requests 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers"> Fill in the message header </param>        
        /// <returns></returns>
        public static async Task<T> HttpPostAsync<T>(string url, string postData = null, string contentType = "application/json", int timeOut = 30, Dictionary<string, string> headers = null)
        {
            var res=await HttpPostAsync(url, postData,contentType, timeOut, headers);
            return res.ToEntity<T>();
        }
 
        /// <summary>
        ///  launch GET Synchronization request 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="headers"></param>
        /// <param name="contentType"></param>
        /// <returns></returns>
        public static T HttpGet<T>(string url, string contentType = "application/json", Dictionary<string, string> headers = null)
        {
            return HttpGet(url, contentType, headers).ToEntity<T>();
        }
 
        /// <summary>
        ///  launch GET Asynchronous requests 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="headers"></param>
        /// <param name="contentType"></param>
        /// <returns></returns>
        public static async Task<T> HttpGetAsync<T>(string url, string contentType = "application/json", Dictionary<string, string> headers = null)
        {
            var res= await HttpGetAsync(url, contentType, headers);
            return res.ToEntity<T>();
        }
    }

complete HttpClient encapsulation

（ note ）C# HttpClient encapsulation