プロジェクト ファイルを追加します。

ZoomInClass.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30413.136
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ZoomInClass", "ZoomInClass\ZoomInClass.csproj", "{A5300D5C-3BEB-4DFA-A4E9-96B512BEB082}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A5300D5C-3BEB-4DFA-A4E9-96B512BEB082}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A5300D5C-3BEB-4DFA-A4E9-96B512BEB082}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A5300D5C-3BEB-4DFA-A4E9-96B512BEB082}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A5300D5C-3BEB-4DFA-A4E9-96B512BEB082}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D18B3F45-6C2E-4DAC-8ACC-E77461F84203}
+	EndGlobalSection
+EndGlobal

ZoomInClass/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+    </startup>
+</configuration>

ZoomInClass/Form1.cs

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+using DiscordRPC;
+using DiscordRPC.Logging;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Diagnostics;
+using System.Drawing;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace ZoomInClass
+{
+    public partial class Form1 : Form
+    {
+        public DiscordRpcClient client;
+        [DllImport("user32")]
+        private static extern bool IsWindowVisible(IntPtr hWnd);
+        public Form1()
+        {
+            InitializeComponent();
+
+            Visible = false;
+            Hide();
+            ShowInTaskbar = false;
+
+            client = new DiscordRpcClient("762930592865714216");
+            client.Logger = new ConsoleLogger() { Level = LogLevel.Warning };
+
+            //Subscribe to events
+            client.OnReady += (_sender, _e) =>
+            {
+                Console.WriteLine("Received Ready from user {0}", _e.User.Username);
+            };
+
+            client.OnPresenceUpdate += (_sender, _e) =>
+            {
+                Console.WriteLine("Received Update! {0}", _e.Presence);
+            };
+
+            //Connect to the RPC
+            client.Initialize();
+            Console.WriteLine("Initialized.");
+
+            timer1.Start();
+        }
+        void Deinitialize()
+        {
+            client.Dispose();
+        }
+
+        Timestamps ts;
+        private void timer1_Tick(object sender, EventArgs e)
+        {
+            Process[] ps = Process.GetProcesses();
+            Boolean isZoomClassing = false;
+            foreach(Process p in ps)
+            {
+                try
+                {
+                    if (!p.ProcessName.Equals("Zoom"))
+                    {
+                        continue;
+                    }
+                    if (!p.MainWindowTitle.Equals("Zoom ミーティング") && !p.MainWindowTitle.Equals("Zoom Meetings") && !p.MainWindowTitle.Equals("Zoom"))
+                    {
+                        continue;
+                    }
+                    isZoomClassing = true;
+                }
+                catch(Exception ex)
+                {
+                    Console.WriteLine("Error: {0}", ex.Message);
+                }
+            }
+
+            if (isZoomClassing)
+            {
+                if(ts == null)
+                {
+                    ts = Timestamps.Now;
+                }
+                client.SetPresence(new RichPresence()
+                {
+                    Details = "Watching Zoom",
+                    Timestamps = ts
+                });
+            }
+            else
+            {
+                client.ClearPresence();
+                ts = null;
+            }
+        }
+
+    }
+}

ZoomInClass/Form1.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="timer1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+</root>

ZoomInClass/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace ZoomInClass
+{
+    static class Program
+    {
+        /// <summary>
+        /// アプリケーションのメイン エントリ ポイントです。
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            //Application.Run(new Form1());
+            new Form1();
+            Application.Run();
+        }
+    }
+}

ZoomInClass/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// アセンブリに関する一般情報は以下の属性セットをとおして制御されます。
+// 制御されます。アセンブリに関連付けられている情報を変更するには、
+// これらの属性値を変更します。
+[assembly: AssemblyTitle("ZoomInClass")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ZoomInClass")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible を false に設定すると、このアセンブリ内の型は COM コンポーネントから
+// 参照できなくなります。COM からこのアセンブリ内の型にアクセスする必要がある場合は、
+// その型の ComVisible 属性を true に設定してください。
+[assembly: ComVisible(false)]
+
+// このプロジェクトが COM に公開される場合、次の GUID が typelib の ID になります
+[assembly: Guid("a5300d5c-3beb-4dfa-a4e9-96b512beb082")]
+
+// アセンブリのバージョン情報は、以下の 4 つの値で構成されています:
+//
+//      メジャー バージョン
+//      マイナー バージョン
+//      ビルド番号
+//      リビジョン
+//
+// すべての値を指定するか、次を使用してビルド番号とリビジョン番号を既定に設定できます
+// 既定値にすることができます:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]