Nethereum
How to decode ERC20 event (Transfer or Approval) out from transaction log using Nethereum
I tried to get ERC20 event like transfer or approval from transaction logs and it works when I tried on ERC721 while it fails for ERC20. Actually, for every transaction log I've already tested, the decoded object would all go null. Is there anything wrong with the Nethereum usage or due to some else reasons, the following is my demo code, could you please help with it? Thanks, @juanfranblanco
ERc20 event is not indexed the last parameter
you mean there are only two params for ERC20 event? According to https://ethereum.org/en/developers/docs/standards/tokens/erc-20/, it seems cover this, thanks, @juanfranblanco
I tried to use txReceipt.DecodeAllEvents<TransferEventDTOBase>() instead while for most ERC721 events it works, for ERC20 it returns no events when it can be found on Etherscan according to the transaction hash. Is it the correct API to fetch ERC20 events or it only worked for ERC721, or my "TransferEventDTO" is incorrect? Could you please give me the sample to get ERC20 event from transaction receipt if my grammar is wrong. Great thanks, @juanfranblanco
Etherscan event link: https://rinkeby.etherscan.io/address/0xc7ad46e0b8a400bb3c915120d284aafba8fc4735#events, Transaction hash: 0x2b003012981d278bcaf086b2c0faf64a2e5b8cea2edca6eee6ee1a80277f71e8
Could you please take a look at this question if convenient, thanks, @juanfranblanco
@Kane-Tang
The 721 transfer has an extra index, see that "true" in the attribute of the property index
https://github.com/Nethereum/Nethereum/blob/master/src/Nethereum.Contracts/Standards/ERC721/ContractDefinition/ERC721Definition.cs#L397
as opposed to erc20
which value is not
https://github.com/Nethereum/Nethereum/blob/master/src/Nethereum.Contracts/Standards/ERC20/ContractDefinition/ERC20Definition.cs#L142
So they look the same but they are not, what you can do is to check the number of Topics for the matching log and switch accordingly.