RequestOptions.IfNoneMatchEtag Property
Definition
Important
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Most commonly used to detect changes to the resource Gets or sets the If-None-Match (ETag) associated with the request in the Azure Cosmos DB service.
public string IfNoneMatchEtag { get; set; }member this.IfNoneMatchEtag : string with get, setPublic Property IfNoneMatchEtag As StringProperty Value
Remarks
Most commonly used with reads such as ReadItemAsync<T>(String, PartitionKey, ItemRequestOptions, CancellationToken). When Item Etag matches the specified IfNoneMatchEtag then 304 status code will be returned, otherwise existing Item will be returned with 200. UpsertItemAsync<T>(T, Nullable<PartitionKey>, ItemRequestOptions, CancellationToken) will ignore IfNoneMatchEtag when materialized as Create, otherwise for Replace Etag constraint will be applied.
To match any Etag use "*" If specified for writes (ex: Create, Replace, Delete) will be ignored.
