public sealed class UpdateTopicRequest : IMessage<UpdateTopicRequest>, IEquatable<UpdateTopicRequest>, IDeepCloneable<UpdateTopicRequest>, IBufferMessage, IMessage
Reference documentation and code samples for the Cloud Pub/Sub v1 API class UpdateTopicRequest.
Required. Indicates which fields in the provided topic to update. Must be
specified and non-empty. Note that if update_mask contains
"message_storage_policy" but the message_storage_policy is not set in
the topic provided above, then the updated value is determined by the
policy configured at the project or organization level.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-09 UTC."],[[["\u003cp\u003eThis page provides reference documentation for the \u003ccode\u003eUpdateTopicRequest\u003c/code\u003e class within the Google Cloud Pub/Sub v1 API for .NET.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of the \u003ccode\u003eUpdateTopicRequest\u003c/code\u003e documentation is 3.23.0, with a list of all versions provided ranging from 2.3.0 to the most recent.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eUpdateTopicRequest\u003c/code\u003e class, which is part of the \u003ccode\u003eGoogle.Cloud.PubSub.V1\u003c/code\u003e namespace, is used to send a request to update a topic, implementing multiple interfaces such as \u003ccode\u003eIMessage\u003c/code\u003e and \u003ccode\u003eIEquatable\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eUpdateTopicRequest\u003c/code\u003e class has two constructors: a default constructor and a constructor that takes another \u003ccode\u003eUpdateTopicRequest\u003c/code\u003e object as a parameter.\u003c/p\u003e\n"],["\u003cp\u003eThe key properties for the \u003ccode\u003eUpdateTopicRequest\u003c/code\u003e class are \u003ccode\u003eTopic\u003c/code\u003e, which represents the updated topic object, and \u003ccode\u003eUpdateMask\u003c/code\u003e, which indicates which fields should be updated in the topic.\u003c/p\u003e\n"]]],[],null,["# Cloud Pub/Sub v1 API - Class UpdateTopicRequest (3.27.0)\n\nVersion latestkeyboard_arrow_down\n\n- [3.27.0 (latest)](/dotnet/docs/reference/Google.Cloud.PubSub.V1/latest/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.26.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.26.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.25.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.25.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.24.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.24.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.23.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.23.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.22.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.22.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.21.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.21.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.20.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.20.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.19.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.19.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.18.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.18.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.17.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.17.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.16.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.16.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.15.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.15.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.14.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.14.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.13.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.13.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.12.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.12.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.11.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.11.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.10.1](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.10.1/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.9.1](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.9.1/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.8.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.8.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.7.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.7.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.6.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.6.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.5.1](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.5.1/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.4.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.4.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.3.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.3.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.2.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.2.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.1.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.1.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [3.0.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/3.0.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.10.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.10.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.9.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.9.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.8.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.8.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.7.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.7.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.6.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.6.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.5.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.5.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.4.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.4.0/Google.Cloud.PubSub.V1.UpdateTopicRequest)\n- [2.3.0](/dotnet/docs/reference/Google.Cloud.PubSub.V1/2.3.0/Google.Cloud.PubSub.V1.UpdateTopicRequest) \n\n public sealed class UpdateTopicRequest : IMessage\u003cUpdateTopicRequest\u003e, IEquatable\u003cUpdateTopicRequest\u003e, IDeepCloneable\u003cUpdateTopicRequest\u003e, IBufferMessage, IMessage\n\nReference documentation and code samples for the Cloud Pub/Sub v1 API class UpdateTopicRequest.\n\nRequest for the UpdateTopic method. \n\nInheritance\n-----------\n\n[object](https://learn.microsoft.com/dotnet/api/system.object) \\\u003e UpdateTopicRequest \n\nImplements\n----------\n\n[IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage-1.html)[UpdateTopicRequest](/dotnet/docs/reference/Google.Cloud.PubSub.V1/latest/Google.Cloud.PubSub.V1.UpdateTopicRequest), [IEquatable](https://learn.microsoft.com/dotnet/api/system.iequatable-1)[UpdateTopicRequest](/dotnet/docs/reference/Google.Cloud.PubSub.V1/latest/Google.Cloud.PubSub.V1.UpdateTopicRequest), [IDeepCloneable](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IDeepCloneable-1.html)[UpdateTopicRequest](/dotnet/docs/reference/Google.Cloud.PubSub.V1/latest/Google.Cloud.PubSub.V1.UpdateTopicRequest), [IBufferMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IBufferMessage.html), [IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage.html) \n\nInherited Members\n-----------------\n\n[object.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.object.gethashcode) \n[object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype) \n[object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)\n\nNamespace\n---------\n\n[Google.Cloud.PubSub.V1](/dotnet/docs/reference/Google.Cloud.PubSub.V1/latest/Google.Cloud.PubSub.V1)\n\nAssembly\n--------\n\nGoogle.Cloud.PubSub.V1.dll\n\nConstructors\n------------\n\n### UpdateTopicRequest()\n\n public UpdateTopicRequest()\n\n### UpdateTopicRequest(UpdateTopicRequest)\n\n public UpdateTopicRequest(UpdateTopicRequest other)\n\nProperties\n----------\n\n### Topic\n\n public Topic Topic { get; set; }\n\nRequired. The updated topic object.\n\n### UpdateMask\n\n public FieldMask UpdateMask { get; set; }\n\nRequired. Indicates which fields in the provided topic to update. Must be\nspecified and non-empty. Note that if `update_mask` contains\n\"message_storage_policy\" but the `message_storage_policy` is not set in\nthe `topic` provided above, then the updated value is determined by the\npolicy configured at the project or organization level."]]
