Delete documents (C#)
Finds documents in a collection using filter clauses, and then deletes those documents.
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If you don’t use a filter, or if you use an empty filter, then this method deletes all documents in the collection. |
This method does not support sort parameters, including vector search.
If you want to use sort parameters to find documents, use the method to find documents instead.
Then, use the method to delete a single document to delete each found document by ID.
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Ready to write code? See the examples for this method to get started. If you are new to the Data API, check out the quickstart. |
Result
Deletes documents that match the specified parameters and returns a DeleteResult object, which includes the number of documents that were deleted.
A result that includes a deleted count of -1 indicates that every document in the collection was deleted.
Parameters
Use the DeleteManyAsync method, which belongs to the Collection class.
You can also use DeleteMany, which is the synchronous version of the method.
Method signature
public Task<DeleteResult> DeleteManyAsync(
CollectionFilter<T> filter,
CollectionDeleteManyOptions options = null
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An object that defines filter criteria using the Data API filter syntax. The method only finds documents that match the filter criteria. Filters can improve performance by reducing the number of documents that the Data API processes. You must use For a list of available filter operators and more examples, see Filter operators for collections (C#). Filters can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in a filter. For an example, see Delete documents that match a filter.
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Optional. General API options for this operation, including the timeout. For more information and examples, see Customize API interaction. |
Examples
The following examples demonstrate how to delete documents in a collection.
Delete documents that match a filter
You can use a filter to find documents that match specific criteria.
For example, you can find documents with an is_checked_out value of false and a number_of_pages value less than 300.
For a list of available filter operators and more examples, see Filter operators for collections (C#).
Filters can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in a filter.
The following example uses untyped documents, but you can use strongly-typed classes for compile-time checks and IntelliSense. For more information and examples, see Custom typing for collections.
using DataStax.AstraDB.DataApi;
using DataStax.AstraDB.DataApi.Collections;
using DataStax.AstraDB.DataApi.Core;
namespace Examples;
public class Program
{
static async Task Main()
{
// Get an existing collection
var client = new DataAPIClient();
var database = client.GetDatabase(
"API_ENDPOINT",
"APPLICATION_TOKEN"
);
var collection = database.GetCollection("COLLECTION_NAME");
// Delete documents
var filterBuilder = Builders<Document>.CollectionFilter;
var filter = filterBuilder.And(
filterBuilder.Eq("is_checked_out", false),
filterBuilder.Lt("number_of_pages", 300)
);
var result = await collection.DeleteManyAsync(filter);
Console.WriteLine(result.DeletedCount);
}
}Delete all documents
To delete all documents, use an empty filter.
A result that includes a deleted count of -1 indicates that every document in the collection was deleted.
The following example uses untyped documents, but you can use strongly-typed classes for compile-time checks and IntelliSense. For more information and examples, see Custom typing for collections.
using DataStax.AstraDB.DataApi;
using DataStax.AstraDB.DataApi.Collections;
using DataStax.AstraDB.DataApi.Core;
namespace Examples;
public class Program
{
static async Task Main()
{
// Get an existing collection
var client = new DataAPIClient();
var database = client.GetDatabase(
"API_ENDPOINT",
"APPLICATION_TOKEN"
);
var collection = database.GetCollection("COLLECTION_NAME");
// Delete documents
var result = await collection.DeleteManyAsync(
Builders<Document>.CollectionFilter.Empty()
);
Console.WriteLine(result.DeletedCount);
}
}Delete more than 20 documents
The client automatically issues multiple Data API HTTP requests to delete all documents that match your filter.
Client reference
For more information, see the client reference.
