Miner.Start not working, unable to mine contract using Nethereum testChain (Geth v1.6.6)

Question

Been testing Nethereum and attempting to get a basic test class running as per the Nethereum documentation, but having trouble when running the mining command.

• I am using Geth v1.6.6
• Running the Nethereum testchain via
  https://github.com/Nethereum/Nethereum/tree/master/testchain

Issue

1. Miner.Start was always bringing back "false" to begin with. Then I stumbled on to this question Nethereum 2.0.0-rc5 Miner which mentions that I should try using the pre-release where Web3Geth is the new way to call mining, trying both ways, I am still unable to get a true value to then continue with my test.

   var mineResult = await web3Geth.Miner.Start.SendRequestAsync(6);
   //var mineResult = await web3.Miner.Start.SendRequestAsync(6);
   

This is my XUnit test class where the issue is happening.

    using System.Threading;
    using System.Threading.Tasks;
    using Nethereum.Geth;
    using Nethereum.Hex.HexTypes;
    using Nethereum.Web3;
    using Xunit;

namespace BasicTurorial
{
    public class TestClass
    {
        [Fact]
        public async Task ShouldBeAbleToDeployAContract()
        {
            var senderAddress = "0x12890d2cce102216644c59daE5baed380d84830c";
            var password = "password";

            var abi = @"[{""constant"":false,""inputs"":[{""name"":""val"",""type"":""int256""}],""name"":""multiply"",""outputs"":[{""name"":""d"",""type"":""int256""}],""payable"":false,""type"":""function""},{""inputs"":[{""name"":""multiplier"",""type"":""int256""}],""payable"":false,""type"":""constructor""}]";
            var byteCode =
                "0x60606040523415600b57fe5b6040516020806100ac83398101604052515b60008190555b505b6079806100336000396000f300606060405263ffffffff60e060020a6000350416631df4f14481146020575bfe5b3415602757fe5b60306004356042565b60408051918252519081900360200190f35b60005481025b9190505600a165627a7a72305820ec2cf1c300fa92e0ccd1f5ce518cc43c9578fe9007797024f1424d07f491020a0029";
            var multiplier = 7;

            var web3 = new Web3();
            var web3Geth = new Web3Geth();

            var unlockAccountResult =
                await web3.Personal.UnlockAccount.SendRequestAsync(senderAddress, password, 120);

            Assert.True(unlockAccountResult);

            var transactionHash =
                await web3.Eth.DeployContract.SendRequestAsync(abi, byteCode, senderAddress, multiplier);

            var mineResult = await web3Geth.Miner.Start.SendRequestAsync(6);
            //var mineResult = await web3.Miner.Start.SendRequestAsync(6);

            Assert.True(mineResult);

            var receipt = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(transactionHash);

            while (receipt == null)
            {
                Thread.Sleep(5000);
                receipt = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(transactionHash);
            }

            var contractAddress = receipt.ContractAddress;
            var contract = web3.Eth.GetContract(abi, contractAddress);

            var multiplyFunction = contract.GetFunction("multiply");

            var result = await multiplyFunction.CallAsync<int>(7);

            Assert.Equal(49, result);
        }
    }
}

Full sourcecode can be found here https://github.com/stradled/NethereumTest

Answer 1

I happened to stumble upon the same problem and after weeks of trial and error this worked for me:

var web3 = new Nethereum.Geth.Web3Geth("http://127.0.0.1:8454");
var mine = await web3.Miner.Start.SendRequestAsync(6);

NB:// please use the local address and port that applies to you, mine in this case is 127.0.0.1:8454