更新多个文档
您可以使用集合对象的UpdateMany() 方法更新多个文档。
示例
以下代码更新了所有具有“cuisine”字段值为“Pizza”的restaurants集合中的文档。更新后，这些文档的“cuisine”字段值将变为“Pasta and breadsticks”。
选择异步或同步选项卡以查看相应的代码。
const string oldValue = "Pizza"; const string newValue = "Pasta and breadsticks"; // Creates a filter for all documents with a "cuisine" value of "Pizza" var filter = Builders<Restaurant>.Filter .Eq(restaurant => restaurant.Cuisine, oldValue); // Creates instructions to update the "cuisine" field of documents that // match the filter var update = Builders<Restaurant>.Update .Set(restaurant => restaurant.Cuisine, newValue); // Updates all documents that have a "cuisine" value of "Pizza" return await _restaurantsCollection.UpdateManyAsync(filter, update);
有关UpdateManyAsync()操作的完整运行示例，请参阅UpdateManyAsync代码示例.
const string oldValue = "Pizza"; const string newValue = "Pasta and breadsticks"; // Creates a filter for all documents with a "cuisine" value of "Pizza" var filter = Builders<Restaurant>.Filter .Eq(restaurant => restaurant.Cuisine, oldValue); // Creates instructions to update the "cuisine" field of documents that // match the filter var update = Builders<Restaurant>.Update .Set(restaurant => restaurant.Cuisine, newValue); // Updates all documents that have a "cuisine" value of "Pizza" return _restaurantsCollection.UpdateMany(filter, update);
有关UpdateMany()操作的完整运行示例，请参阅UpdateMany代码示例。
预期结果
运行上述任何完整示例将打印以下结果
Restaurants with cuisine "Pizza" found: 1163 Restaurants modified by update: 1163 Restaurants with cuisine "Pasta and breadsticks" found after update: 1163 Resetting sample data...done.
更多信息
要了解有关更新文档的更多信息，请参阅修改文档指南。
要了解有关使用构建器的更多信息，请参阅使用构建器进行操作。