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Lab 3
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‎Lab 3/ConsoleApp/ConsoleApp.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>netcoreapp2.0</TargetFramework>
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<AssemblyName>ConsoleApp.Lab3</AssemblyName>
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<StartupObject>ConsoleApp.Program</StartupObject>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="..\..\Lab 2\Solidity\contracts\build\ISimpleStorageContractService.Generated.cs" Link="ISimpleStorageContractService.Generated.cs" />
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<Compile Include="..\..\Lab 2\Solidity\contracts\build\SimpleStorageContractService.Generated.cs" Link="SimpleStorageContractService.Generated.cs" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Nethereum.Geth" Version="2.2.3" />
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<PackageReference Include="Nethereum.Web3" Version="2.2.3" />
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<PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
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</ItemGroup>
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</Project>

‎Lab 3/ConsoleApp/ConsoleApp.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.27130.2036
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConsoleApp", "ConsoleApp.csproj", "{E41E4230-826C-4B8C-BBB4-2B73732D4364}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{E41E4230-826C-4B8C-BBB4-2B73732D4364}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{E41E4230-826C-4B8C-BBB4-2B73732D4364}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E41E4230-826C-4B8C-BBB4-2B73732D4364}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E41E4230-826C-4B8C-BBB4-2B73732D4364}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {96E9B6A0-ACA9-4777-9DCD-3DAF4EE96B16}
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EndGlobalSection
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EndGlobal

‎Lab 3/ConsoleApp/Program.cs‎

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using System;
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using System.Threading.Tasks;
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using Lab2.SmartContracts;
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using Nethereum.Web3.Accounts.Managed;
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using Nethereum.Geth;
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using Nethereum.Hex.HexTypes;
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namespace ConsoleApp
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{
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class Program
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{
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/// <summary>
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/// Simple ConsoleApp to connect to Ethereum Consortium Blockchain on Azure to deploy a contract and run functions and transactions.
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/// This project depends on the Solidity project from Lab 2. So make sure to run `npm run build`.
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/// </summary>
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public static void Main(string[] args)
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{
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Console.WriteLine("Blockchain - Ethereum - ConsoleApp");
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string senderAddress = "0x???"; // TODO 1
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string password = "test";
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Console.WriteLine(new string('-', 80));
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TestService(senderAddress, password).Wait(1000 * 60 * 5); // Wait max 5 minutes
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Console.WriteLine(new string('-', 80));
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}
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private static async Task TestService(string fromAddress, string password)
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{
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var account = new ManagedAccount(fromAddress, password);
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var web3 = new Web3Geth(account, "http://???.westeurope.cloudapp.azure.com:8545/"); // TODO 2
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bool deployNewContract = true;
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string contractAddress = null;
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if (deployNewContract)
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{
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var gasForDeployContract = new HexBigInteger(1500000);
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Console.WriteLine("Deploying contract (can take some time)");
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contractAddress = await SimpleStorageContractService.DeployContractAsync(web3, fromAddress, 1, "mstack.nl", null, gasForDeployContract).ConfigureAwait(false);
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Console.WriteLine($"Deploying contract done, address = {contractAddress}");
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}
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// Create an instance from the SimpleStorageContractService service which
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// abstracts all calls to the SmartContract.
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ISimpleStorageContractService service = new SimpleStorageContractService(web3, contractAddress);
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bool setNumberResult = await service.ExecuteTransactionAsync(srv => srv.SetNumberAsync(fromAddress, 500)).ConfigureAwait(false);
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Console.WriteLine($"setNumberResult = '{setNumberResult}'.");
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var getNumberValue = await service.GetNumberCallAsync(fromAddress).ConfigureAwait(false);
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Console.WriteLine($"The stored number value is '{getNumberValue}'.");
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bool setStringResult = await service.ExecuteTransactionAsync(srv => srv.SetStringAsync(fromAddress, "mstack.nl test"));
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Console.WriteLine($"setStringResult = '{setStringResult}'.");
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var getStringValue = await service.GetStringCallAsync(fromAddress).ConfigureAwait(false);
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Console.WriteLine($"The stored string value is '{getStringValue}'.");
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}
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}
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}

‎Lab 3/README.md‎

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# Lab 3
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## Info
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This lab (continues on Lab 2) and will teach you how to:
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- deploy the SmartContract using a console application to Ethereum Consortium Blockchain on Azure
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- execute functions on the SmartContract which is deployed to Ethereum Consortium Blockchain on Azure
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If you have some generic or detailed questions, please feel free to ask these at mStack colleagues.
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## Folder structure
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- `ConsoleApp`: folder for the ConsoleApp (C#).
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## Details
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This lab contains one simple SmartContract:
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- `SimpleStorageContract` this contract can store and retrieve number and string values
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## Steps
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Execute the following steps in order to follow this Lab.
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### Step 1
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Now open a new command terminal in Visual Code, and type:
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- `cd Lab 3`
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- `cd ConsoleApp`
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- `dotnet build` (if all is fine, a restore should be done and the build should complete with 0 errors.)
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### Step 2
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Open the file `Lab 3\ConsoleApp\Program.cs` in Visual Code.
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- `TODO 1` : make sure to fill in your assigned address. Note that the password is always `test`.
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- `TODO 2` : replace `http://???.westeurope.cloudapp.azure.com:8545/` by the correct URL provided by mStack.
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- Run the ConsoleApp `dotnet run` and the output should look like this:
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``` x
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Blockchain - Ethereum - ConsoleApp
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--------------------------------------------------------------------------------
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Deploying contract (can take some time)
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Deploying contract done, address = 0x97da25343187cbc1d31d98b1fd244cec5fc77f86
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setNumberResult = 'True'.
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The stored number value is '10'.
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setStringResult = 'True'.
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The stored string value is 'mstack.nl test'.
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```
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### Step 3
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You can experiment by calling some other functions or providing other values.
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### Step 4
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Each time you run the full program, a new contract is deployed, if you want to keep using the same contract, just remember the contract address and use that one. (See also step 11 from Lab 2)
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### Step 5
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Done

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