Bitcoin Forum

hi , i download bitcoin core from here https://bitcoin.org/en/download and try to connect to it from c# i use the demo code from here https://github.com/cryptean/bitcoinlib i set bitcoin.conf
but error happens , here is error message :
Connecting to Bitcoin MainNet via RPC at http://127.0.0.1:8332...An unknown web exception occured while trying to read the JSON response
   at BitcoinLib.RPC.Connector.RpcConnector.MakeRequest[T](RpcMethods rpcMethod, Object[] parameters) in C:\Users\pc\Downloads\bitcoinlib-master\bitcoinlib-master\src\BitcoinLib\RPC\Connector\RpcConnector.cs:line 132
   at BitcoinLib.Services.CoinService.GetDifficulty() in C:\Users\pc\Downloads\bitcoinlib-master\bitcoinlib-master\src\BitcoinLib\Services\RpcServices\RpcService\RpcService.cs:line 225
   at ConsoleClient.Program.Main() in C:\Users\pc\Downloads\bitcoinlib-master\bitcoinlib-master\demo\Program.cs:line 104

C:\Program Files\dotnet\dotnet.exe (process 9492) exited with code 0.
To automatically close the console when debugging stops, enable Tools->Options->Debugging->Automatically close the console when debugging stops.
Press any key to close this window . . .
i even write a question in stackoverflow site here https://stackoverflow.com/questions/74886756/unknown-web-exception-occured-while-trying-to-read-the-json-response-bitcoin-cor  but no one answer it ,my question what the wrong i do and how to fix it , and what exactly the steps to connect from c# to bitcoin core, Thanks.

I'm not C# programmer, but it's obvious your question lack some detail/information. For example,
1. Have you configure Bitcoin Core to accept RPC connection[1]? If yes, have you checked it with other networking tool?
2. I checked the demo code and it use testnet by default[2]. Did you make change to make it connect to mainnet instead?

[1] https://github.com/cryptean/bitcoinlib#instructions-for-bitcoin (https://github.com/cryptean/bitcoinlib#instructions-for-bitcoin)
[2] https://github.com/cryptean/bitcoinlib/blob/master/demo/Program.cs#L20 (https://github.com/cryptean/bitcoinlib/blob/master/demo/Program.cs#L20)

i am beginner in dealing with bitcoian core ,
 how to configure Bitcoin Core to accept RPC connection?
as for 2. I checked the demo code and it use testnet by default[2]. Did you make change to make it connect to mainnet instead? there is option in the demo to use testnet  or not , i try the two options but did not connect,here is the code:
  private static readonly ICoinService CoinService = new BitcoinService(useTestnet: true);

IIRC certain commands will not work when you are still syncing the blockchain. Core will just spit back a message about what it is doing not the information you requested.

Also keep in mind when editing the ini file after saving you have to stop and restart core it does not pick up changes.

And (this is just good programming) keep a log of changes you made and why.

-Dave

It looks like you are trying to use the BitcoinLib library to connect to a Bitcoin Core node using C#. The error message you are seeing, "An unknown web exception occurred while trying to read the JSON response," suggests that there might be an issue with the connection to the Bitcoin Core node.

There are a few things you can try to troubleshoot this issue:

Make sure that your Bitcoin Core node is running and reachable at the address and port specified in the BitcoinLib configuration (e.g. http://127.0.0.1:8332). You can verify this by trying to connect to the node using a tool like curl or a web browser.

Make sure that you have correctly configured the bitcoin.conf file in your Bitcoin Core data directory. This file should contain the following lines:

server=1
rpcuser=<username>
rpcpassword=<password>

Replace <username> and <password> with the values you specified when you started Bitcoin Core.

Make sure that the values you are using for the rpcuser and rpcpassword in the BitcoinLib configuration match the values you specified in the bitcoin.conf file.

If you are using a firewall, make sure that it is not blocking incoming connections to the Bitcoin Core node on the specified port (e.g. 8332).

I hope this helps! Let me know if you have any other questions.

a little error ,the word in bitcoin.conf:

rpcpass=mypass

is wrong must be :

rpcpassword=mypass

i change it and it worked fine