[Framwork Add]Add examples

examples/Directory.Build.props

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+    <PropertyGroup>
+        <Copyright>2024 The SharpNeo Examples Project</Copyright>
+        <VersionPrefix>3.6.2</VersionPrefix>
+        <TargetFramework>net7.0</TargetFramework>
+        <Authors>The SharpNeo Project</Authors>
+        <PackageIcon>neo.png</PackageIcon>
+        <PackageProjectUrl>https://github.com/neo-project/neo-devpack-dotnet/examples</PackageProjectUrl>
+        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+        <PackageReadmeFile>README.md</PackageReadmeFile>
+        <RepositoryType>git</RepositoryType>
+        <RepositoryUrl>https://github.com/neo-project/neo-devpack-dotnet.git</RepositoryUrl>
+        <IncludeSymbols>true</IncludeSymbols>
+        <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+        <Company>The Neo N3 Contract Examples Project</Company>
+        <GenerateDocumentationFile>true</GenerateDocumentationFile>
+        <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>false</AllowUnsafeBlocks>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\src\Neo.SmartContract.Framework\Neo.SmartContract.Framework.csproj" />
+    </ItemGroup>
+
+<!--    <Target Name="PostBuild" AfterTargets="PostBuildEvent">-->
+<!--        <Exec Command="dotnet nccs &quot;$(MSBuildProjectFile)&quot;" />-->
+<!--    </Target>-->
+</Project>

examples/Example.SmartContract.ContractCall/ContractCall.cs

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+// Copyright (C) 2015-2024 The Neo Project.
+//
+// ContractCall.cs file belongs to the neo project and is free
+// software distributed under the MIT software license, see the
+// accompanying file LICENSE in the main directory of the
+// repository or http://www.opensource.org/licenses/mit-license.php
+// for more details.
+//
+// Redistribution and use in source and binary forms with or without
+// modifications are permitted.
+
+using Neo.SmartContract.Framework;
+using Neo.SmartContract.Framework.Attributes;
+using Neo.SmartContract.Framework.Services;
+using System.ComponentModel;
+using System.Numerics;
+
+namespace ContractCall;
+
+[DisplayName("SampleContractCall")]
+[ContractAuthor("core-dev")]
+[ContractEmail("[email protected]")]
+[ContractVersion("0.0.1")]
+[ContractDescription("A sample contract to demonstrate how to call a contract")]
+[ContractSourceCode("https://github.com/neo-project/neo-devpack-dotnet/tree/master/examples/")]
+public class SampleContractCall : SmartContract
+{
+    [Hash160("0x13a83e059c2eedd5157b766d3357bc826810905e")]
+    private static readonly UInt160 DummyTarget;
+
+    public static void onNEP17Payment(UInt160 from, BigInteger amount, BigInteger data)
+    {
+        if (!data.Equals(123)) return;
+        UInt160 @this = Runtime.ExecutingScriptHash;
+        UInt160 tokenHash = Runtime.CallingScriptHash;
+        BigInteger balanceOf = (BigInteger)Contract.Call(tokenHash, "balanceOf", CallFlags.All, @this);
+        Contract.Call(DummyTarget, "dummyMethod", CallFlags.All, @this, tokenHash, balanceOf);
+    }
+}

examples/Example.SmartContract.ContractCall/Example.SmartContract.ContractCall.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <RootNamespace>ContractCall</RootNamespace>
+    </PropertyGroup>
+
+</Project>

examples/Example.SmartContract.Event/Event.cs

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+// Copyright (C) 2015-2024 The Neo Project.
+//
+// Event.cs file belongs to the neo project and is free
+// software distributed under the MIT software license, see the
+// accompanying file LICENSE in the main directory of the
+// repository or http://www.opensource.org/licenses/mit-license.php
+// for more details.
+//
+// Redistribution and use in source and binary forms with or without
+// modifications are permitted.
+
+using Neo.SmartContract.Framework;
+using Neo.SmartContract.Framework.Attributes;
+using System;
+using System.ComponentModel;
+using System.Numerics;
+
+namespace Event;
+
+[DisplayName("SampleEvent")]
+[ContractAuthor("code-dev", "[email protected]")]
+[ContractDescription("A sample contract that demonstrates how to use Events")]
+[ContractVersion("0.0.1")]
+[ContractSourceCode("https://github.com/neo-project/neo-devpack-dotnet/tree/master/examples/")]
+[ContractPermission(Permission.WildCard, Method.WildCard)]
+public class SampleEvent : SmartContract
+{
+    [DisplayName("new_event_name")]
+    public static event Action<byte[], string, BigInteger> event_name;
+
+    public static event Action<byte[], BigInteger> event2;
+
+    public static bool Main()
+    {
+        byte[] ba = new byte[] { 0x01, 0x02, 0x03 };
+        event_name(ba, "oi", 10); // will Example.SmartContract.Runtime.Notify: 'new_event_name', '\x01\x02\x03', 'oi', 10
+        event2(ba, 50); // will Example.SmartContract.Runtime.Notify: 'event2', '\x01\x02\x03', '\x32'
+        return false;
+    }
+}

examples/Example.SmartContract.Event/Example.SmartContract.Event.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <RootNamespace>Event</RootNamespace>
+    </PropertyGroup>
+
+</Project>

examples/Example.SmartContract.Exception/Example.SmartContract.Exception.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <RootNamespace>Exception</RootNamespace>
+    </PropertyGroup>
+
+</Project>