Accessing Ethereum’s JSON-RPC API with C#
The Ethereum Virtual Machine (EVM) and ITS JSON-RPC Interface Provide A standardized way for developers to interact with Smart Contracts and Deploy Decentralized Applications (DAPPs). One of the key features of the EVM is its ability to communicate with external services, such as the JSON-RPC API, using C#.
Prerequisites
Before we dive into how to access the Ethereum’s JSON-RPC API in C#, you’ll need:
- An active ethereum node (e.g., Ethereum Mainnet or Ropsten Testnet).
- A compatible C
runtime (e.g., .net Framework 4.8, .net core 3.1, or mono).
- The
Microsoft.ethNuget Package for .net Framework and theSystem.Runtime.CompilerservicesPackage for .net core.
Step-by-Step Instructions
To access the Ethereum’s JSON-RPC API in C#, Follow These Steps:
Using .net framework
Install The Required Nuet Packages
`Bash
Install-Package Microsoft.ethh
`
create a new class to handle the RPC Connection
`csharp
Using System;
using system.net.http;
using system.Threading.tasks;
Public Class Ethereumrpchandler: iDisposable
{
Private readonly string _rpcurl = "
Private Readonly httpclient _httpclient;
Public Ethereumrpchandler (RPCURL string)
{
_httpclient = new httpclient ();
_httpclient.defaultrequestheaders.accept.clear ();
_httpclient.defaultrequestheaders.add ("X-eth-RPC-Version", "1");
_httpclient.defaultrequestheaders.add ("X-eth-RPC-Subscription-token", RPCURL);
_rpcurl = $ "{_ httpclient.defaultrequestheaders [" x-eth-rpc-url "]}/{_ rpcurl}";
}
Public Async Task
{
VAR response = await _httpclient.getasync (_rpcurl + "/blocknumber");
Response.ensuresuccessStatuscode ();
Return Await Response.Content.ReadassStringasync ();
}
}
create an instance of the Ethereumrpchandler Class
`csharp
var rpchandler = new etherumrpchandler ("
use the GetBlockNUMberAsync Method to retrieve block numbers
csharp
Await rpchandler.getblocknumberasync ();
using.net core
Install The Required Nuet Packages
`Bash
Install-Package Microsoft.ethh
`
create a new class to handle the RPC Connection
`csharp
Using System;
using system.net.http;
using system.Threading.tasks;
Public Class Ethereumrpchandler: iDisposable
{
Private readonly string _rpcurl = "
Private Readonly httpclient _httpclient;
Public Ethereumrpchandler (RPCURL string)
{
_httpclient = new httpclient ();
_httpclient.defaultrequestheaders.accept.clear ();
_httpclient.defaultrequestheaders.add ("X-eth-RPC-Version", "1");
_httpclient.defaultrequestheaders.add ("X-eth-RPC-Subscription-token", RPCURL);
_rpcurl = $ "{_ httpclient.defaultrequestheaders [" x-eth-rpc-url "]}/{_ rpcurl}";
}
Public Async Task
{
VAR response = await _httpclient.getasync (_rpcurl + "/blocknumber");
Response.ensuresuccessStatuscode ();
Return Await Response.Content.ReadassStringasync ();
}
}
create an instance of the Ethereumrpchandler Class
`csharp
var rpchandler = new etherumrpchandler ("
use the GetBlockNUMberAsync Method to retrieve block numbers
csharp
Await rpchandler.getblocknumberasync ();
Error Handling
To access the JSON-RPC API, you’ll need to handle errors that are returned by the interface. You can do this by checking the Response Status Code and Content.
For Example:
“ csharp
try
{
Await rpchandler.