ProductHistory.cs

using Nethereum.ABI.Encoders;
using Nethereum.ABI.FunctionEncoding.Attributes;
using Nethereum.Contracts;
using Nethereum.Web3;
using Nethereum.Web3.Accounts;
using System;
using System.Numerics;
using System.Threading.Tasks;

namespace NethereumSamples
{

        /*
pragma solidity ^0.6.1;
pragma experimental ABIEncoderV2;

contract ProductHistory {

    mapping(bytes32 => string) public productText;
    bytes32[] public productList;

    constructor() public {}

    function newProduct(bytes32 productKey, string memory text) public payable returns (bool) {
        productText[productKey] = text;
        productList.push(productKey);
        return true;
    }

    function getProductText(bytes32 productKey) public view returns(string memory){
        return productText[productKey];
    }
}
         */

    public static class ProductHistorySample
    {
        public static async Task Main(string[] args)
        {
            // contract deployment starts here //
            var url = "http://testchain.nethereum.com:8545";
            var privateKey = "0x7580e7fb49df1c861f0050fae31c2224c6aba908e116b8da44ee8cd927b990b0";
            var account = new Account(privateKey);
            var web3 = new Web3(account, url);
            Console.WriteLine($"Deploying Contract");
            var deploymentReceipt = await web3.Eth.GetContractDeploymentHandler<ProductHistoryDeployment>().SendRequestAndWaitForReceiptAsync();
            Console.WriteLine($"Contract Address: {deploymentReceipt.ContractAddress}");
            // contract deployment ends here //

            var bytes32Encoder = new Bytes32TypeEncoder();
            var contractHandler = web3.Eth.GetContractHandler(deploymentReceipt.ContractAddress);

            // create product
            Console.WriteLine("New Product");
            var newProductFunctionArgs = new NewProductFunction { ProductKey = bytes32Encoder.Encode("p1"), Text = "Product 1" };
            var receipt = await contractHandler.SendRequestAndWaitForReceiptAsync(newProductFunctionArgs);
            Console.WriteLine($"Transaction Complete. Tx Hash: {receipt.TransactionHash},  Success: {receipt.Status}");

            // query
            Console.WriteLine("Query/Get Product");
            var getProductArgs = new GetProductTextFunction { ProductKey = bytes32Encoder.Encode("p1") };
            var productText = await contractHandler.QueryAsync<GetProductTextFunction, string>(getProductArgs);
            Console.WriteLine($"Product Text. {productText}");
        }

        // Generated code starts here

        public partial class ProductHistoryDeployment : ProductHistoryDeploymentBase
        {
            public ProductHistoryDeployment() : base(BYTECODE) { }
            public ProductHistoryDeployment(string byteCode) : base(byteCode) { }
        }

        public class ProductHistoryDeploymentBase : ContractDeploymentMessage
        {
            public static string BYTECODE = "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";
            public ProductHistoryDeploymentBase() : base(BYTECODE) { }
            public ProductHistoryDeploymentBase(string byteCode) : base(byteCode) { }

        }

        public partial class GetProductTextFunction : GetProductTextFunctionBase { }

        [Function("getProductText", "string")]
        public class GetProductTextFunctionBase : FunctionMessage
        {
            [Parameter("bytes32", "productKey", 1)]
            public virtual byte[] ProductKey { get; set; }
        }

        public partial class NewProductFunction : NewProductFunctionBase { }

        [Function("newProduct", "bool")]
        public class NewProductFunctionBase : FunctionMessage
        {
            [Parameter("bytes32", "productKey", 1)]
            public virtual byte[] ProductKey { get; set; }
            [Parameter("string", "text", 2)]
            public virtual string Text { get; set; }
        }

        public partial class ProductListFunction : ProductListFunctionBase { }

        [Function("productList", "bytes32")]
        public class ProductListFunctionBase : FunctionMessage
        {
            [Parameter("uint256", "", 1)]
            public virtual BigInteger ReturnValue1 { get; set; }
        }

        public partial class ProductTextFunction : ProductTextFunctionBase { }

        [Function("productText", "string")]
        public class ProductTextFunctionBase : FunctionMessage
        {
            [Parameter("bytes32", "", 1)]
            public virtual byte[] ReturnValue1 { get; set; }
        }

        public partial class GetProductTextOutputDTO : GetProductTextOutputDTOBase { }

        [FunctionOutput]
        public class GetProductTextOutputDTOBase : IFunctionOutputDTO
        {
            [Parameter("string", "", 1)]
            public virtual string ReturnValue1 { get; set; }
        }



        public partial class ProductListOutputDTO : ProductListOutputDTOBase { }

        [FunctionOutput]
        public class ProductListOutputDTOBase : IFunctionOutputDTO
        {
            [Parameter("bytes32", "", 1)]
            public virtual byte[] ReturnValue1 { get; set; }
        }

        public partial class ProductTextOutputDTO : ProductTextOutputDTOBase { }

        [FunctionOutput]
        public class ProductTextOutputDTOBase : IFunctionOutputDTO
        {
            [Parameter("string", "", 1)]
            public virtual string ReturnValue1 { get; set; }
        }
    }
}