C#使用Nethereum .NET庫做以太坊開發的demo示例
這裡是c#的主檔案：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Nethereum.Hex.HexTypes;
using Nethereum.Web3;
namespace MWH.MyNethereum.QuickRef
{ static public class TaskExamples
{ const int UNLOCK_TIMEOUT = 2 * 60; // 2 minutes (arbitrary)
const int SLEEP_TIME = 5 * 1000; // 5 seconds (arbitrary)
const int MAX_TIMEOUT = 2 * 60 * 1000; // 2 minutes (arbirtrary)// These static public variables do not represent a recommended pattern
static public string LastProtocolVersion = ""; static public string LastTxHash = ""; static public Nethereum.RPC.Eth.DTOs.TransactionReceipt LastTxReceipt = null; static public HexBigInteger LastMaxBlockNumber = new HexBigInteger(0);static public async Task GetProtocolVersionExample(Web3 web3)
{
Console.WriteLine("GetProtocolVersionExample:");var protocolVersion = await web3.Eth.ProtocolVersion.SendRequestAsync();
Console.WriteLine("protocolVersion:t" + protocolVersion.ToString());
LastProtocolVersion = protocolVersion;
}static public async Task GetMaxBlockExample(Web3 web3)
{
Console.WriteLine("GetMaxBlockExample:");var maxBlockNumber = await web3.Eth.Blocks.GetBlockNumber.SendRequestAsync();
Console.WriteLine("maxBlockNumber:t" + maxBlockNumber.Value.ToString());
LastMaxBlockNumber = maxBlockNumber;
}static public async Task ScanBlocksExample(Web3 web3, ulong startBlockNumber, ulong endBlockNumber)
{
Console.WriteLine("ScanBlocksExample:");
long txTotalCount = 0; for (ulong blockNumber = startBlockNumber; blockNumber <= endBlockNumber; blockNumber++)
{ var blockParameter = new Nethereum.RPC.Eth.DTOs.BlockParameter(blockNumber); var block = await web3.Eth.Blocks.GetBlockWithTransactionsByNumber.SendRequestAsync(blockParameter); var trans = block.Transactions;
int txCount = trans.Length;
txTotalCount += txCount; if (blockNumber % 1000 == 0) Console.Write("."); if (blockNumber % 10000 == 0)
{
DateTime blockDateTime = Helpers.UnixTimeStampToDateTime((double)block.Timestamp.Value);
Console.WriteLine(blockNumber.ToString() + " " + txTotalCount.ToString() + " " + blockDateTime.ToString());
}
}
Console.WriteLine();
}static public async Task ScanTxExample(Web3 web3, ulong startBlockNumber, ulong endBlockNumber)
{
Console.WriteLine("ScanTxExample:");
long txTotalCount = 0; for (ulong blockNumber = startBlockNumber; blockNumber <= endBlockNumber; blockNumber++)
{ var blockParameter = new Nethereum.RPC.Eth.DTOs.BlockParameter(blockNumber); var block = await web3.Eth.Blocks.GetBlockWithTransactionsByNumber.SendRequestAsync(blockParameter); var trans = block.Transactions;
int txCount = trans.Length;
txTotalCount += txCount;
foreach (var tx in trans)
{ try
{ var bn = tx.BlockNumber.Value; var th = tx.TransactionHash; var ti = tx.TransactionIndex.Value;var rpt = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(th); var status = rpt.Status.Value;var nc = tx.Nonce.Value; var from = tx.From;
Console.WriteLine(th.ToString() + " " + ti.ToString() + " " + from.ToString() + " " + status.ToString());var to = tx.To; if (to == null) to = "to:NULL"; var v = tx.Value.Value; var g = tx.Gas.Value; var gp = tx.GasPrice.Value;
Console.WriteLine(th.ToString() + " " + ti.ToString() + " " + nc.ToString() + " " + from.ToString() + " " + to.ToString() + " " + v.ToString() + " " + g.ToString() + " " + gp.ToString());
} catch (Exception ex)
{
Console.WriteLine("ScanTxExample.Tx:t" + ex.ToString()); if (ex.InnerException != null) Console.WriteLine("ScanTxExample.Tx:t" + ex.InnerException.ToString());
}
}
Console.WriteLine();
}
}static public async Task GetAccountBalanceExample(Web3 web3, string accountAddress)
{
Console.WriteLine("GetAccountBalanceExample:");var balanceWei = await web3.Eth.GetBalance.SendRequestAsync(accountAddress); var balanceEther = Web3.Convert.FromWei(balanceWei.Value);
Console.WriteLine("accountAddress:t" + accountAddress.ToString());
Console.WriteLine("balanceEther:t" + balanceEther.ToString());
}static public async Task ListPersonalAccountsExample(Web3 web3)
{
Console.WriteLine("ListPersonalAccountsExample:");var accounts = await web3.Personal.ListAccounts.SendRequestAsync();
foreach (var account in accounts)
{ var balanceWei = await web3.Eth.GetBalance.SendRequestAsync(account); var balanceEther = Web3.Convert.FromWei(balanceWei.Value);
Console.WriteLine("account:t" + account + " balanceEther:t" + balanceEther.ToString());
}
}static public async Task SendEtherExample(Web3 web3, string fromAddress, string fromPassword, string toAddress, long amountWei)
{
Console.WriteLine("SendEtherExample:");var unlockResult = await web3.Personal.UnlockAccount.SendRequestAsync(fromAddress, fromPassword, UNLOCK_TIMEOUT); var sendTxHash = await web3.Eth.TransactionManager.SendTransactionAsync(fromAddress, toAddress, new HexBigInteger(amountWei));
Console.WriteLine("fromAddress:t" + fromAddress.ToString());
Console.WriteLine("toAddress:t" + toAddress.ToString());
Console.WriteLine("amountWei:t" + amountWei.ToString());
Console.WriteLine("sendTxHash:t" + sendTxHash.ToString());
LastTxHash = sendTxHash;
}static public async Task WaitForTxReceiptExample(Web3 web3, string txHash)
{
Console.WriteLine("WaitForTxReceiptExample:");
int timeoutCount = 0; var txReceipt = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txHash); while (txReceipt == null && timeoutCount < MAX_TIMEOUT)
{
Console.WriteLine("Sleeping...");
Thread.Sleep(SLEEP_TIME);
txReceipt = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txHash);
timeoutCount += SLEEP_TIME;
}
Console.WriteLine("timeoutCount " + timeoutCount.ToString());
LastTxReceipt = txReceipt;
}static public async Task InteractWithExistingContractExample(Web3 web3, string fromAddress, string fromPassword, string contractAddress, string contractAbi)
{
Console.WriteLine("InteractWithExistingContractExample:");var contract = web3.Eth.GetContract(contractAbi, contractAddress);var setMessageFunction = contract.GetFunction("setMsg"); var getMessageFunction = contract.GetFunction("getMsg");
string nowTimestamp = DateTime.UtcNow.ToString() + " UTC";
Console.WriteLine("now:t" + nowTimestamp);var unlockResult = await web3.Personal.UnlockAccount.SendRequestAsync(fromAddress, fromPassword, UNLOCK_TIMEOUT); var txHash1 = await setMessageFunction.SendTransactionAsync(fromAddress, new HexBigInteger(900000), null, 1, "Hello World");
Console.WriteLine("txHash1:t" + txHash1.ToString()); var txHash2 = await setMessageFunction.SendTransactionAsync(fromAddress, new HexBigInteger(900000), null, 2, nowTimestamp);
Console.WriteLine("txHash2:t" + txHash2.ToString());var txReceipt2 = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txHash2);
int timeoutCount = 0; while (txReceipt2 == null && timeoutCount < MAX_TIMEOUT)
{
Console.WriteLine("Sleeping...");
Thread.Sleep(SLEEP_TIME);
txReceipt2 = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txHash2);
timeoutCount += SLEEP_TIME;
}
Console.WriteLine("timeoutCount:t" + timeoutCount.ToString());var txReceipt3 = await setMessageFunction.SendTransactionAndWaitForReceiptAsync(fromAddress, new HexBigInteger(900000), null, null, 2, nowTimestamp + " Wait");
Console.WriteLine("txReceipt3:t" + txReceipt3.TransactionHash.ToString());
Console.WriteLine("txReceipt3:t" + txReceipt3.CumulativeGasUsed.Value.ToString());var getResult1 = await getMessageFunction.CallAsync<string>(1);
Console.WriteLine("getResult1:t" + getResult1.ToString()); var getResult2 = await getMessageFunction.CallAsync<string>(2);
Console.WriteLine("getResult2:t" + getResult2.ToString());
}static public async Task InteractWithExistingContractWithEventsExample(Web3 web3, string fromAddress, string fromPassword, string contractAddress, string contractAbi)
{
Console.WriteLine("InteractWithExistingContractWithEventsExample:");var contract = web3.Eth.GetContract(contractAbi, contractAddress);var setMessageFunction = contract.GetFunction("setMsg"); var getMessageFunction = contract.GetFunction("getMsg"); var multipliedEvent = contract.GetEvent("MultipliedEvent"); var newMessageEvent = contract.GetEvent("NewMessageEvent");var filterAllMultipliedEvent = await multipliedEvent.CreateFilterAsync(); var filterAllNewMessageEvent = await newMessageEvent.CreateFilterAsync();
string nowTimestamp = DateTime.UtcNow.ToString() + " UTC";
Console.WriteLine("now:t" + nowTimestamp);var unlockResult = await web3.Personal.UnlockAccount.SendRequestAsync(fromAddress, fromPassword, UNLOCK_TIMEOUT); var txHash1 = await setMessageFunction.SendTransactionAsync(fromAddress, new HexBigInteger(900000), null, 1, "Hello World");
Console.WriteLine("txHash1:t" + txHash1.ToString()); var txHash2 = await setMessageFunction.SendTransactionAsync(fromAddress, new HexBigInteger(900000), null, 2, nowTimestamp);
Console.WriteLine("txHash2:t" + txHash2.ToString());var txReceipt2 = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txHash2);
int timeoutCount = 0; while (txReceipt2 == null && timeoutCount < MAX_TIMEOUT)
{
Console.WriteLine("Sleeping...");
Thread.Sleep(SLEEP_TIME);
txReceipt2 = await web3.Eth.Transactions.GetTransactionReceipt.SendRequestAsync(txHash2);
timeoutCount += SLEEP_TIME;
}
Console.WriteLine("timeoutCount:t" + timeoutCount.ToString());var txReceipt3 = await setMessageFunction.SendTransactionAndWaitForReceiptAsync(fromAddress, new HexBigInteger(900000), null, null, 2, nowTimestamp + " Wait");
Console.WriteLine("txReceipt3:t" + txReceipt3.TransactionHash.ToString());
Console.WriteLine("txReceipt3:t" + txReceipt3.CumulativeGasUsed.Value.ToString());var getResult1 = await getMessageFunction.CallAsync<string>(1);
Console.WriteLine("getResult1:t" + getResult1.ToString()); var getResult2 = await getMessageFunction.CallAsync<string>(2);
Console.WriteLine("getResult2:t" + getResult2.ToString());var logMultipliedEvents = await multipliedEvent.GetFilterChanges<FunctionOutputHelpers.MultipliedEventArgs>(filterAllMultipliedEvent);
foreach (var mea in logMultipliedEvents)
{
Console.WriteLine("multipliedEvent:t" +
mea.Event.sender + " " + mea.Event.oldProduct.ToString() + " " + mea.Event.value.ToString() + " " + mea.Event.newProduct.ToString());
}var logNewMessageEvents = await newMessageEvent.GetFilterChanges<FunctionOutputHelpers.NewMessageEventArgs>(filterAllNewMessageEvent);
foreach (var mea in logNewMessageEvents)
{
Console.WriteLine("newMessageEvent:t" +
mea.Event.sender + " " + mea.Event.ind.ToString() + " " + mea.Event.msg.ToString());
}
}static public async Task GetAllChangesExample(Web3 web3, string fromAddress, string fromPassword, string contractAddress, string contractAbi)
{
Console.WriteLine("GetAllChangesExample:");var contract = web3.Eth.GetContract(contractAbi, contractAddress); var newMessageEvent = contract.GetEvent("NewMessageEvent"); var filterAllNewMessageEvent = await newMessageEvent.CreateFilterAsync(fromAddress); var logNewMessageEvents = await newMessageEvent.GetAllChanges<FunctionOutputHelpers.NewMessageEventArgs>(filterAllNewMessageEvent);
foreach (var mea in logNewMessageEvents)
{
Console.WriteLine("newMessageEvent:t" +
mea.Event.sender + " " + mea.Event.ind.ToString() + " " + mea.Event.msg.ToString());
}
}static public async Task GetContractValuesHistoryUniqueOffsetValueExample(Web3 web3, string contractAddress, HexBigInteger recentBlockNumber, ulong numberBlocks, int offset)
{
Console.WriteLine("GetContractValuesHistoryUniqueOffsetValueExample:");
string previousValue = ""; for (ulong blockNumber = (ulong)recentBlockNumber.Value; blockNumber > (ulong)recentBlockNumber.Value - numberBlocks; blockNumber--)
{ var blockNumberParameter = new Nethereum.RPC.Eth.DTOs.BlockParameter(blockNumber); var valueAtOffset = await web3.Eth.GetStorageAt.SendRequestAsync(contractAddress, new HexBigInteger(offset), blockNumberParameter); if (valueAtOffset != previousValue)
{ var block = await web3.Eth.Blocks.GetBlockWithTransactionsByNumber.SendRequestAsync(blockNumberParameter);
DateTime blockDateTime = Helpers.UnixTimeStampToDateTime((double)block.Timestamp.Value);
Console.WriteLine("blockDateTime:t" + blockDateTime.ToString());for (int storageOffset = 0; storageOffset < offset+2; storageOffset++)
{ var valueAt = await web3.Eth.GetStorageAt.SendRequestAsync(contractAddress, new HexBigInteger(storageOffset), blockNumberParameter);
Console.WriteLine("value:t" + blockNumber.ToString() + " " + storageOffset.ToString() + " " + valueAt + " " + Helpers.ConvertHex(valueAt.Substring(2)));
}
previousValue = valueAtOffset;
}
}
}
}
}
以下是一些支援檔案：
FunctionOutputHelpers.cs
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Nethereum.Web3;using Nethereum.ABI.FunctionEncoding.Attributes;namespace MWH.MyNethereum.QuickRef
{ static public class FunctionOutputHelpers
{
// event MultipliedEvent(
// address indexed sender,
// int oldProduct,
// int value,
// int newProduct
// );[FunctionOutput] public class MultipliedEventArgs
{
[Parameter("address", "sender", 1, true)] public string sender { get; set; }
[Parameter("int", "oldProduct", 2, false)] public int oldProduct { get; set; }
[Parameter("int", "value", 3, false)] public int value { get; set; }
[Parameter("int", "newProduct", 4, false)] public int newProduct { get; set; }
}//event NewMessageEvent(
// address indexed sender,
// uint256 indexed ind,
// string msg
//);[FunctionOutput] public class NewMessageEventArgs
{
[Parameter("address", "sender", 1, true)] public string sender { get; set; }
[Parameter("uint256", "ind", 2, true)] public int ind { get; set; }
[Parameter("string", "msg", 3, false)] public string msg { get; set; }
}
}
}
Helpers.cs
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace MWH.MyNethereum.QuickRef
{ static public class Helpers
{
public static string ConvertHex(String hexString)
{ try
{ string ascii = string.Empty;for (int i = 0; i < hexString.Length; i += 2)
{
String hs = string.Empty;
hs = hexString.Substring(i, 2);
uint decval = System.Convert.ToUInt32(hs, 16); char character = System.Convert.ToChar(decval);
ascii += character;
}return ascii;
} catch (Exception ex) { Console.WriteLine(ex.Message); }return string.Empty;
}public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)
{ // Unix timestamp is seconds past epoch
System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddSeconds(unixTimeStamp); // .ToLocalTime();
return dtDateTime;
}public static DateTime JavaTimeStampToDateTime(double javaTimeStamp)
{ // Java timestamp is milliseconds past epoch
System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddMilliseconds(javaTimeStamp); // .ToLocalTime();
return dtDateTime;
}
}
}
以下是用於實施這些示例時使用的以太坊合約的Solidity程式碼：
Test3.sol
pragma solidity 0.4.19;
contract Test3 {int public _product;string[5] _msgs;
event MultipliedEvent(
address indexed sender,int oldProduct,int value,int newProduct
);
event NewMessageEvent(
address indexed sender,
uint256 indexed ind,string msg
);function Test3() public {
_product = 1;
}function multiply(int value) public returns(int product) {int old = _product;
_product = value * _product;
MultipliedEvent( msg.sender, old, value, _product );return _product;
}
function getProduct() public constant returns(int product) {return _product;
}function setMsg(uint256 i, string m) public returns(uint256 mi) {
_msgs[i] = m;
NewMessageEvent( msg.sender, i, m);return -i;
}function getMsg(uint256 index) public constant returns(string m) {return _msgs[index];
}
}
我覺得這是釋出程式碼示例的一種相當簡單粗暴的方式。有任何更好建議歡迎留言。
======================================================================
作者：程式設計狂魔
連結：
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/2144/viewspace-2820212/，如需轉載，請註明出處，否則將追究法律責任。
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