CSharp Driver LINQ Tutorial MongoDB Manual
Last with a predicate is not supported after a projection at least not yet. When combining Take with Skip often you will also specify a sort order.
This method is used to test whether an array or array-like field or property contains all of the provided values. This overload of Single allows you to provide a predicate as an argument to Single. ThenBy is used to specify an additional ascending sort order for the result set. Use Take to specify how many documents to return from the server. Sub-expressions can be combined with the operator to test whether any of them is true.
You can usually rewrite such a query by putting an equivalent where clause before the projection. Sometimes a predicate can be supplied in other places besides a where clause, and it is also possible to have multiple where clauses. This section documents the supported where clauses. As mentioned earlier, not all C expressions are supported as a where clause.
Count method array length. Provide your input on the Platform and Runtime Survey we kept it short.
Distinct returns the unique values of a field or property of the documents in the collection. The driver features a built-in Mapper and Linq components that can use to avoid boilerplate mapping code between cql rows and your application entities. See the driver components documentation for more information. The relative comparison are based on the value of the underlying integer type. If the result set has no documents or multiple documents Single throws an exception.
ElementAtOrDefault is just like ElementAt except that if there are fewer documents than index it returns null instead of throwing an exception. The C compiler translates all queries written using query syntax into lambda syntax internally anyway, can you skip drivers ed in texas so there is no performance advantage or penalty to choosing either style. This overload of Last allows you to provide a predicate as an argument to Last. The following query matches all the documents where X is odd.
mongo-csharp-driver/src at master mongodb/mongo-csharp-driver GitHub
All the code samples in this tutorial show both the query syntax and the lambda syntax for each query operator and supported where clauses. FirstOrDefault is just like First except that if there are no matching documents it returns null instead of throwing an exception. ThenByDescending is used to specify an additional descending sort order for the result set.
You use a projection to identify the field or property whose minimum value you want. This operator is used to test the result of the mod operator against a field or property of the document. FirstOrDefault with predicate.
This is an alternative to using a where clause. Additionally, you can use the datastax-drivers channel in the DataStax Academy Slack. Often you will combine Skip with a sort order. Count property array length.
LastOrDefault with predicate. Without a predicate Count just returns the number of documents in the collection. You can also use the static IsMatch method. SingleOrDefault with predicate.
Any with a predicate is not supported after a projection at least not yet. Single returns the first and only document from a result set.
See the License for the specific language governing permissions and limitations under the License. If the result set has fewer documents than index ElementAt throws an exception. IsMatch regular expression method.
csharp-driver/src/Cassandra at master datastax/csharp-driver GitHub
You can also write queries using lambda syntax. With a predicate Any tests whether the collection has any matching documents. You may obtain a copy of the License at. If the result set has no documents Last throws an exception. This method is used to test whether a string field or property of the document starts with a particular substring.
Any Without a predicate Any just tests whether the collection has any documents. Use Skip to specify how many documents to skip from the beginning of the result set. Without a predicate Any just tests whether the collection has any documents. FirstOrDefault with a predicate is just like First with a predicate except that if there are no matching documents it returns null instead of throwing an exception.
This property is used to test whether a list or list-like field or property has a certain count of items. First with a predicate is not supported after a projection at least not yet. WithCompression CompressionType. ElementAt returns a particular document from a result set.
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