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Smart Contracts: Events (Retrieving Events by Parameter Value) (1049) #24

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16 changes: 10 additions & 6 deletions Nethereum.Playground/Repositories/CSharpSamples.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -102,12 +102,16 @@ static async Task Main(string[] args)
Name = "Smart Contracts: Events (End to End Introduction)",
Id = "1008",
},

new CodeSample()
{
Name = "Smart Contracts: Events (Retrieving Events from Chain)",
Id = "1009",
},
new CodeSample()
{
Name = "Smart Contracts: Events (Retrieving Events from Chain)",
Id = "1009",
},
new CodeSample()
{
Name = "Smart Contracts: Events (Retrieving Events by Parameter Value)",
Id = "1049"
},
new CodeSample()
{
Name = "Smart Contracts: Estimating Gas",
Expand Down
84 changes: 84 additions & 0 deletions Nethereum.Playground/wwwroot/samples/csharp/1049.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,84 @@
using Nethereum.ABI.FunctionEncoding.Attributes;
using Nethereum.Contracts;
using Nethereum.RPC.Eth.DTOs;
using Nethereum.Web3;
using System;
using System.Numerics;
using System.Threading.Tasks;

public class SmartContracts_RetrievingEventsByParameterValue
{
public static async Task Main()
{
// Demonstrates using a FilterInputBuilder to retrieve specific logs by event parameter value

var web3 = new Web3("https://rinkeby.infura.io/v3/7238211010344719ad14a89db874158c");

var fromAddressFilter = new FilterInputBuilder<TransferEventDTO>()
.AddTopic(tfr => tfr.From, "0x0000000000000000000000000000000000000000")
.Build("0x109424946d5aa4425b2dc1934031d634cdad3f90");

var toAddressFilter = new FilterInputBuilder<TransferEventDTO>()
.AddTopic(tfr => tfr.To, "0xb456427fcee27c4a8f607c1403927d14063a6698")
.Build("0x109424946d5aa4425b2dc1934031d634cdad3f90");

var toAddressAnyContractFilter = new FilterInputBuilder<TransferEventDTO>()
.AddTopic(tfr => tfr.To, "0xb456427fcee27c4a8f607c1403927d14063a6698")
.Build();

// find any transfer matching one of many from addresses
// specifying a block range to restrict results
var oneOfManyFromAddresses = new FilterInputBuilder<TransferEventDTO>()
.AddTopic(tfr => tfr.From, "0x53c475aa2d6ae167fe5229814c6694b3c5f6cf2f")
.AddTopic(tfr => tfr.From, "0xcc46e788e063f11e2ccd12b0e031ef24542a8129")
.Build(blockRange: new BlockRange(3303153, 3310713));

var toAddress = await web3.Eth.Filters.GetLogs.SendRequestAsync(toAddressFilter);
WriteLogs("By To Address:", toAddress);

var fromAddress = await web3.Eth.Filters.GetLogs.SendRequestAsync(fromAddressFilter);
WriteLogs("By From Address:", fromAddress);

var toAddressAnyContract = await web3.Eth.Filters.GetLogs.SendRequestAsync(toAddressAnyContractFilter);
WriteLogs("By To Address for Any Contract:", toAddressAnyContract);

var manyFromAddresses = await web3.Eth.Filters.GetLogs.SendRequestAsync(oneOfManyFromAddresses);
WriteLogs("From one of many addresses:", manyFromAddresses);
}

private static void WriteLogs(string title, FilterLog[] logs)
{
Console.WriteLine($"{title} (Logs: {logs.Length})");

foreach (var log in logs)
{
Console.WriteLine($"Block Number:{log.BlockNumber.Value}");
Console.WriteLine($"Transaction Hash:{log.TransactionHash}");
Console.WriteLine($"Transaction Index:{log.TransactionIndex.Value}");

// Decode the log so that we can see the Transfer event parameters
var transferArgs = log.DecodeEvent<TransferEventDTO>();

Console.WriteLine($"From:{transferArgs.Event.From}");
Console.WriteLine($"To:{transferArgs.Event.To}");
Console.WriteLine($"Value:{transferArgs.Event.Value}");
}

Console.WriteLine();
}

[Event("Transfer")]
public class TransferEventDTO : IEventDTO
{
[Parameter("address", "_from", 1, true)]
public string From { get; set; }

[Parameter("address", "_to", 2, true)]
public string To { get; set; }

[Parameter("uint256", "_value", 3, false)]
public BigInteger Value { get; set; }
}


}