To delete a single document, create a filter definition that matches the document you want to remove and call the DeleteOne method on a IMongoCollection<T> reference.
IMongoCollection<T>
.DeleteOne(<filter>)
The samples filter a User document by its Id and removes it from the collection.
DeleteDocuments.cs
// get a collection reference
var personsCollection = usersDatabase
.GetCollection<User>(Constants.UsersCollection);
// find a person using an equality filter on its id
var filter = Builders<User>.Filter.Eq(person => person.Id, appPerson.Id);
// delete the person
var personDeleteResult = await personsCollection.DeleteOneAsync(filter);
if (personDeleteResult.DeletedCount == 1)
{
Utils.Log($"Document {appPerson.Id} deleted");
}
// get a collection reference
var bsonPersonCollection = usersDatabase
.GetCollection<BsonDocument>(Constants.UsersCollection);
// find a person using a greater than filter on its salary field
var bsonSingleFilter = Builders<BsonDocument>.Filter.Gt("salary", 2000);
// delete the first person that fulfills the filter criteria
var bsonPersonDeleteResult = await bsonPersonCollection
.DeleteOneAsync(bsonSingleFilter);
// delete a single document
db.users.deleteOne({ _id : ObjectId("5e5ff25170dc588dd0870073")})
----------------------
// sample result
{
"acknowledged" : true,
"deletedCount" : 1
}
public class User
{
[BsonId]
[BsonIgnoreIfDefault] // required for replace documents
public ObjectId Id { get; set; }
public Gender Gender { get; set; }
public string FirstName {get; set; }
public string LastName {get; set; }
public string UserName {get; set; }
public string Avatar {get; set; }
public string Email {get; set; }
public DateTime DateOfBirth {get; set; }
public AddressCard Address {get; set; }
public string Phone {get; set; }
[BsonIgnoreIfDefault]
public string Website {get; set; }
public CompanyCard Company {get; set; }
public decimal Salary { get; set; }
public int MonthlyExpenses { get; set; }
public List<string> FavoriteSports { get; set; }
public string Profession { get; set; }
}
When your filter criteria matches more the one document, the first document that matches the filter will be removed
Use a field that is unique across a single collection to be more precise
Delete the first document in the collection
To delete the first document in the collection, simply use an empty filter definition.
DeleteDocuments.cs
// get a collection reference
var personsCollection = usersDatabase
.GetCollection<User>(Constants.UsersCollection);
// create an empty filter definition
var emptyFilter = Builders<User>.Filter.Empty;
// delete the first document in the collection
var firstPersonDeleteResult = await personsCollection
.DeleteOneAsync(emptyFilter);
// get a collection reference
var bsonPersonCollection = usersDatabase
.GetCollection<BsonDocument>(Constants.UsersCollection);
// create an empty filter
var bsonEmptyFilter = Builders<BsonDocument>.Filter.Empty;
// delete the first document in the collection
var bsonFirstPersonDeleteResult = await bsonPersonCollection
.DeleteOneAsync(bsonEmptyFilter);
// delete the first document in the collection
db.users.deleteOne({})
public class User
{
[BsonId]
[BsonIgnoreIfDefault] // required for replace documents
public ObjectId Id { get; set; }
public Gender Gender { get; set; }
public string FirstName {get; set; }
public string LastName {get; set; }
public string UserName {get; set; }
public string Avatar {get; set; }
public string Email {get; set; }
public DateTime DateOfBirth {get; set; }
public AddressCard Address {get; set; }
public string Phone {get; set; }
[BsonIgnoreIfDefault]
public string Website {get; set; }
public CompanyCard Company {get; set; }
public decimal Salary { get; set; }
public int MonthlyExpenses { get; set; }
public List<string> FavoriteSports { get; set; }
public string Profession { get; set; }
}
Delete multiple documents
To remove more that one documents at the same time, create a filter definition to match the documents you wish to delete and use the DeleteMany method on an IMongoCollection<T>.
Syntax: IMongoCollection<T>.DeleteMany(<filter>)
IMongoCollection<T>
.DeleteMany(<filter>)
The following example shows how to delete user documents based on the salary field .
DeleteDocuments.cs
var personsCollection = usersDatabase
.GetCollection<User>(Constants.UsersCollection);
// create a filter
var salaryFilter = Builders<User>.Filter
.And(
Builders<User>.Filter.Gt(person => person.Salary, 1200),
Builders<User>.Filter.Lt(person => person.Salary, 3500)
);
// for demonstration only - just to validate the total documents removed
var totalPersons = await personsCollection
.Find(salaryFilter).CountDocumentsAsync();
// delete the documents
var personsDeleteResult = await personsCollection.DeleteManyAsync(salaryFilter);
if (personsDeleteResult.DeletedCount.Equals(totalPersons))
{
Utils.Log($"{totalPersons} users deleted");
}
var bsonPersonCollection = usersDatabase
.GetCollection<BsonDocument>(Constants.UsersCollection);
// find all users with salary > 2000
var bsonSingleFilter = Builders<BsonDocument>.Filter.Gt("salary", 2000);
// delete the matched documents
var bsonPersonsDeleteResult = await bsonPersonCollection
.DeleteManyAsync(bsonSingleFilter);
public class User
{
[BsonId]
[BsonIgnoreIfDefault] // required for replace documents
public ObjectId Id { get; set; }
public Gender Gender { get; set; }
public string FirstName {get; set; }
public string LastName {get; set; }
public string UserName {get; set; }
public string Avatar {get; set; }
public string Email {get; set; }
public DateTime DateOfBirth {get; set; }
public AddressCard Address {get; set; }
public string Phone {get; set; }
[BsonIgnoreIfDefault]
public string Website {get; set; }
public CompanyCard Company {get; set; }
public decimal Salary { get; set; }
public int MonthlyExpenses { get; set; }
public List<string> FavoriteSports { get; set; }
public string Profession { get; set; }
}
Delete all documents
To delete all documents in a collection, you can use the DeleteMany method with an empty filter. If you want though to clear the entire collection, it's faster to just drop it.
