diff --git a/.gitignore b/.gitignore
index c8ef4f6..f118dce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -70,3 +70,8 @@ fastlane/Preview.html
 fastlane/screenshots
 fastlane/test_output
 
+/C#/CSharpDemo/bin/*
+/C#/CSharpDemo/obj/*
+/C#/CSharpDemo/.vs/CSharpDemo/v16/TestStore/0/*.testlog
+/C#/CSharpDemo/.vs/CSharpDemo/v16/*.suo
+/C#/CSharpDemo/.vs/CSharpDemo/v16/TestStore/0/*.manifest
diff --git a/C#/CSharpDemo.sln b/C#/CSharpDemo.sln
new file mode 100644
index 0000000..7e743fe
--- /dev/null
+++ b/C#/CSharpDemo.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31025.194
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CSharpDemo", "CSharpDemo\CSharpDemo.csproj", "{1F904FCB-7180-4388-BDD0-457D56A988AC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1F904FCB-7180-4388-BDD0-457D56A988AC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1F904FCB-7180-4388-BDD0-457D56A988AC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1F904FCB-7180-4388-BDD0-457D56A988AC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1F904FCB-7180-4388-BDD0-457D56A988AC}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1475C0AB-18D7-4EE1-ADF7-329BAE45C03B}
+	EndGlobalSection
+EndGlobal
diff --git a/C#/CSharpDemo/CSharpDemo.csproj b/C#/CSharpDemo/CSharpDemo.csproj
new file mode 100644
index 0000000..3fc13fd
--- /dev/null
+++ b/C#/CSharpDemo/CSharpDemo.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    <PackageReference Include="RestSharp" Version="106.11.7" />
+  </ItemGroup>
+
+</Project>
diff --git a/C#/CSharpDemo/Program.cs b/C#/CSharpDemo/Program.cs
new file mode 100644
index 0000000..c61a6b1
--- /dev/null
+++ b/C#/CSharpDemo/Program.cs
@@ -0,0 +1,133 @@
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using Newtonsoft.Json.Linq;
+using RestSharp;
+
+namespace CSharpDemo
+{
+    public class Program
+    {
+        public static RestClient Client { get; set; } = new RestClient("https://api.seniverse.com/");
+        /// <summary>
+        /// 在这里填入你的密钥
+        /// </summary>
+        public static string PrivateKey { get; set; } = "your PrivateKey";
+        /// <summary>
+        /// 在这里填入你的公钥
+        /// </summary>
+        public static string PublicKey { get; set; } = "your PublicKey";
+        public static string Api { get; set; } = "v3/weather/daily.json";
+        public static string Location { get; set; } = "beijing";
+        public static string Language { get; set; } = "zh-Hans";
+        public static string Unit { get; set; } = "c";
+        public static string Start { get; set; } = "0";
+        public static string Days { get; set; } = "2";
+        public static string TimeStamp { get; set; }
+
+        /// <summary>
+        /// 签名失效时间
+        /// </summary>
+        public static string ttl { get; set; } = "1800";
+        static void Main(string[] args)
+        {
+            var response = GetWeatherInfoBySign();
+            //解析需要的数据
+            var weatherModels = JObject.Parse(response).SelectToken("results").First.
+                SelectToken("daily").ToObject<List<WeatherModel>>();
+        }
+        /// <summary>
+        /// 用私钥获取天气信息
+        /// </summary>
+        /// <returns></returns>
+        private static string GetWeatherInfo()
+        {
+            var request = BuildRestRequest();
+            request.AddQueryParameter("key", PrivateKey);
+            var response = Client.Execute(request).Content;
+            return response;
+        }
+        /// <summary>
+        /// 通过签名获取天气信息
+        /// </summary>
+        /// <returns></returns>
+        private static string GetWeatherInfoBySign()
+        {
+            var request = BuildRestRequest();
+            request.AddQueryParameter("sig", CreateSign());
+            request.AddQueryParameter("ts", TimeStamp);
+            request.AddQueryParameter("ttl", ttl);
+            request.AddQueryParameter("uid", PublicKey);
+            
+            var response = Client.Execute(request).Content;
+            return response;
+        }
+
+        private static RestRequest BuildRestRequest()
+        {
+            RestRequest request = new RestRequest(Api);
+            
+            request.AddQueryParameter("location", Location);
+            request.AddQueryParameter("language", Language);
+            request.AddQueryParameter("unit", Unit);
+            request.AddQueryParameter("start", Start);
+            request.AddQueryParameter("days", Days);
+            return request;
+        }
+        /// <summary>
+        /// 构造签名
+        /// </summary>
+        /// <returns></returns>
+        public static string CreateSign()
+        {
+            TimeStamp = GetTimeStamp();
+            string queryString = $"ts={TimeStamp}&ttl={ttl}&uid={PublicKey}";
+            return HMACSHA1Text(queryString, PrivateKey);
+        }
+        /// <summary>
+        /// 获取时间戳
+        /// </summary>
+        /// <param name="bflag">false时是13位</param>
+        /// <returns></returns>
+        public static string GetTimeStamp(bool bflag=true)
+        {
+            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
+            string ret = string.Empty;
+            if (bflag)
+                ret = Convert.ToInt64(ts.TotalSeconds).ToString();
+            else
+                ret = Convert.ToInt64(ts.TotalMilliseconds).ToString();
+
+            return ret;
+        }
+        /// <summary>
+        /// HMACSHA1加密，返回base64
+        /// </summary>
+        /// <param name="text">要加密的原串</param>
+        ///<param name="key">私钥</param>
+        /// <returns></returns>
+        public static string HMACSHA1Text(string text, string key)
+        {
+            //HMACSHA1加密
+            HMACSHA1 hmacsha1 = new HMACSHA1();
+            hmacsha1.Key = System.Text.Encoding.UTF8.GetBytes(key);
+
+            byte[] dataBuffer = System.Text.Encoding.UTF8.GetBytes(text);
+            byte[] hashBytes = hmacsha1.ComputeHash(dataBuffer);
+
+            return Convert.ToBase64String(hashBytes);
+
+        }
+    }
+    /// <summary>
+    /// 在这里我只解析了关心的数据，大家可按需要把字段都解析出来
+    /// </summary>
+
+    public class WeatherModel
+    {
+        public DateTime date { get; set; }
+        public string text_day { get; set; }
+        public double high { get; set; }
+        public double low { get; set; }
+    }
+}