更新多个文档
您可以对集合对象使用 UpdateMany() 方法以更新多个文档。
例子
以下代码更新 restaurants 集合中具有值为 "Pizza" 的 cuisine 字段的所有文档。更新后，这些文档将有一个值为 "Pasta and breadsticks" 的 cuisine 字段。
选择 Asynchronous 或 Synchronous 标签页，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() 操作的完全可运行示例，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() 操作的完全可运行示例，请参阅 UpdateMany 代码示例。
预期结果
运行上述任一完整示例都会输出以下结果：
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.
详细信息
如需了解有关使用生成器的更多信息，请参阅生成器操作。