C#实现以太仿DApp合约编译、部署

2022-09-14 18:37:51

在网上找了一些关于C#开发以太仿的资料，大概了解了以太仿常用名词，后续可能需要根据资料查看开源的源码进一步熟悉一下。

一、准备合约

这里准备了一个EzToken.sol合约，目前还不会solidity，所以随便在网上找了一个，由于使用的是solidity的版本是0.5.6的版本，所以需要在string memory _tokenName,中加memory,否则会报错。

pragma solidity >=0.4.21 <0.6.0;

contract EzToken {

    uint256 public totalSupply;
  
    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowed;

    string public  name;                   
    uint8 public decimals;                
    string public symbol;     
  
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
  
    constructor(
        uint256 _initialAmount,
        string memory  _tokenName,
        uint8 _decimalUnits,
        string memory  _tokenSymbol
    ) public {
        balances[msg.sender] = _initialAmount;               
        totalSupply = _initialAmount;                        
        name = _tokenName;                                   
        decimals = _decimalUnits;                            
        symbol = _tokenSymbol;                               
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balances[msg.sender] >= _value);
        balances[msg.sender] -= _value;
        balances[_to] += _value;
        emit Transfer(msg.sender, _to, _value); 
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        uint256 allowance = allowed[_from][msg.sender];
        require(balances[_from] >= _value && allowance >= _value);
        balances[_to] += _value;
        balances[_from] -= _value;
        allowed[_from][msg.sender] -= _value;
        emit Transfer(_from, _to, _value); 
        return true;
    }

    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value); 
        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }
}

二、编译合约

编译合约我这边下载了window版本的solidity编译器https://github.com/ethereum/solidity/releases，这里我下载的是window的0.5.6版本。

然后在solidity-windows目录下cmd命令输入下面命令，之后会编译出一个abi文件、一个bin文件，关于solidity后续还需要进一步学习。

solc ../EzToken.sol --bin --abi --optimize --overwrite -o ../

三、部署

部署合约也是一个交易，只是与普通的交易相比，部署交易需要把合约的字节码和编码后构造函数参数放在请求报文参数中的data字段里，然后通过eth_sendTransaction或eth_sendRawTransaction调用提交给节点。这里发行了CYW的代币。

using Nethereum.Hex.HexConvertors.Extensions;
using Nethereum.Hex.HexTypes;
using Nethereum.RPC.Eth.DTOs;
using Nethereum.Web3;
using System;
using System.IO;
using System.Numerics;
using System.Threading;
using System.Threading.Tasks;
using Nethereum.ABI.FunctionEncoding;
using Nethereum.ABI.Model;


namespace DeployContractTheory
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            Run().Wait();
            Console.ReadLine();
        }
        public static async Task Run()
        {
            string abi = File.ReadAllText("EzToken.abi");
            string bin = File.ReadAllText("EzToken.bin");
            ParametersEncoder encoder = new ParametersEncoder();
            Parameter[] parameters = new Parameter[]
            {
                new Parameter("uint256"),
                new Parameter("string"),
                new Parameter("uint8"),
                new Parameter("string")
            };

            BigInteger initialAmount = new BigInteger(1000000000);
            string tokenName = "CYW";
            BigInteger decimalUnits = new BigInteger(0);
            string tokenSymbol = "CuiYW";
            byte[] encodedParams = encoder.EncodeParameters(parameters, initialAmount, tokenName, decimalUnits, tokenSymbol);

            string data = "0x" + bin + encodedParams.ToHex(false);

            Web3 web3 = new Web3("http://localhost:7545");
            string[] accounts = await web3.Eth.Accounts.SendRequestAsync();

            TransactionInput txinput = new TransactionInput
            {
                From = accounts[0],
                Data = data,
                Gas = new HexBigInteger(1000000),
                GasPrice = new HexBigInteger(20000000000)
            };

            string txhash = await web3.TransactionManager.SendTransactionAsync(txinput);
            TransactionReceipt receipt = null;
            while (true)
            {
                receipt = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txhash);
                if (receipt != null) break;
                Thread.Sleep(1000);
            }
            Console.WriteLine("contract deployed at => " + receipt.ContractAddress);
        }
    }
}

C#实现以太仿DApp合约编译、部署

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