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About RpcClient

RpcClient is a C# dependency library that can be used to develop various applications on Neo, such as wallet clients, games, etc. This project can help you easily invoke Neo RPC interfaces, construct transactions, and invoke contracts.

This document is applicable to Neo N3. It is recommended you use NEO SDK in conjunction with Visual Studio 2019.

Main features#

  • Built-in RPC invocation methods.

  • Transaction construction, serialization and deserialization

  • Script construction for smart contracts

  • Easy-to-use wallet functions: transfer, balance inquiry, and GAS Claim method

Adding reference#

  1. In Visual Studio 2019, create a new .NET project

    :::note The .NET version of the project cannot be earlier than the .NET version used by the Neo SDK. :::

  2. Right-click the project and select Manage NuGet Packages.

  3. Search for Neo.Network.RPC.RpcClient in the search box and install the plugin that appears.

  4. Add the following code to the desired project file header:

    using Neo.Network.RPC;
note

If you use SDK to construct a transaction that requires a signature, you need to ensure that the RpcClient obeject and the network it is connected to are configured the same way, or the transaction constructed by the SDK will not be validated in the blockchain. To do so, load Neo-CLI config.json when constructing the RpcClient object, for example:

RpcClient client = new RpcClient(new Uri("http://localhost:20332"), null, null, ProtocolSettings.Load("config.json"))

Exception handing#

RpcClient mainly interacts with Neo nodes through RPC requests. When the message returned by the RPC request contains an Error the system throws an exception. The most common exception type is RpcException, which includes:

  • -100, "Unknown transaction/blockhash"
  • -300, "Insufficient funds"
  • -301, "The necessary fee is more than the Max_fee, this transaction is failed. Please increase your Max_fee value."
  • -400, "Access denied"
  • -500, Relay does not succeed, the detailed reasons contain "AlreadyExists, OutOfMemory, UnableToVerify, Invalid, Expired, InsufficientFunds, PolicyFail, Unknown"
  • -32600, "Invalid Request"
  • -32601, "Method not found"
  • -32602, "Invalid params"
  • -32700, "Parse error"

Additionally, you may encounter other exceptions built in the .NET platform, such as ArgumentNullException and FormatException when the parameters passed in are null or incorrectly formatted. Therefore, reasonable exception capture and prompts are required when using the SDK.

Project repository#

The RpcClient is a functional subset of the neo-modules project. For complete open source projects refer to:

Neo-modules：https://github.com/neo-project/neo-modules

Welcome to raise any problems you encountered in practice in the project issue list:

https://github.com/neo-project/neo-modules/issues