Class CreateTopicParams

Consensus Topics Creation Parameters.

Inheritance

object

TransactionParams

TransactionParams<CreateTopicReceipt>

CreateTopicParams

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Hiero

Assembly: Hiero.dll

Syntax

public sealed class CreateTopicParams : TransactionParams<CreateTopicReceipt>

Examples

Create a plain public topic — anyone can submit messages, but only the payer can pay auto-renewal fees:

var createReceipt = await client.CreateTopicAsync(new CreateTopicParams
{
    Memo = "Hiero SDK Sample Topic",
    RenewPeriod = TimeSpan.FromDays(90),
    RenewAccount = new EntityId(0, 0, payerNum)
});
Console.WriteLine($"Topic created: {createReceipt.Topic}");

Properties

Administrator

An optional endorsement, when specified, can be used to authorize a modification or deletion of this topic, including control of topic lifetime extensions. Additionally, if null, any account can extend the topic lifetime.

Declaration

public Endorsement? Administrator { get; set; }

Property Value

Type	Description
Endorsement

CancellationToken

Optional cancellation token that can interrupt the submission process.

Declaration

public CancellationToken? CancellationToken { get; set; }

Property Value

Type	Description
CancellationToken?

Memo

Short description of the topic, not checked for uniqueness.

Declaration

public string? Memo { get; set; }

Property Value

Type	Description
string

RenewAccount

Optional address of the account supporting the auto renewal of the topic at expiration time. The topic lifetime will be extended by the RenewPeriod at expiration time if this account contains sufficient funds. The private key associated with this account must sign the transaction if RenewAccount is specified.

Declaration

public EntityId? RenewAccount { get; set; }

Property Value

Type	Description
EntityId

Remarks

If specified, an Administrator Endorsement must also be specified.

RenewPeriod

Initial lifetime of the topic and auto-renewal period. If the associated account does not have sufficient funds to renew at the expiration time, it will be renewed for a period of time the remaining funds can support. If no funds remain, the topic instance will be deleted.

Declaration

public TimeSpan RenewPeriod { get; set; }

Property Value

Type	Description
TimeSpan

Signatory

Additional private key, keys or signing callback method required to create this topic. Typically matches the Administrator, Submitter and RenewAccount key(s) associated with this topic.

Declaration

public Signatory? Signatory { get; set; }

Property Value

Type	Description
Signatory

Remarks

Keys/callbacks added here will be combined with those already identified in the client object's context when signing this transaction to change the state of this topic.

Submitter

Identify any key requirements for submitting messages to this topic. If left blank, any account may submit messages to this topic, otherwise they must meet the specified signing requirements.

Declaration

public Endorsement? Submitter { get; set; }

Property Value

Type	Description
Endorsement