// 按指定的 AQS 语法从索引器中查询数据 private async void ExecuteQueryHelper(string queryString) { lblMsg.Text = ""; var indexer = ContentIndexer.GetIndexer(); // 需要检索的属性 string[] propertyKeys = { SystemProperties.Title, SystemProperties.Keywords, SystemProperties.Comment }; // 指定 AQS 字符串(Advanced Query Syntax),参见 http://msdn.microsoft.com/zh-cn/library/windows/apps/aa965711.aspx var query = indexer.CreateQuery(queryString, propertyKeys); // 执行查询,并获取结果 var documents = await query.GetAsync(); foreach (var document in documents) { string itemString = "Key: " + document.Id + "\n"; foreach (var propertyKey in propertyKeys) { itemString += propertyKey + ": " + StringifyProperty(document.Properties[propertyKey]) + "\n"; } lblMsg.Text += itemString + "\n"; } }
// 添加数据到索引器 private async void btnAddToIndexer_Click(object sender, RoutedEventArgs e) { // 获取一个索引器(可以指定索引器的名字,从而达到对索引器分类的目的) var indexer = ContentIndexer.GetIndexer(); var content = new IndexableContent(); for (int i = 0; i < 100; i++) { content.Properties[SystemProperties.Title] = "Title: " + i.ToString().PadLeft(2, '0'); content.Properties[SystemProperties.Keywords] = "Keywords: " + i.ToString().PadLeft(2, '0'); // 多个用“;”隔开 content.Properties[SystemProperties.Comment] = "Comment: " + i.ToString().PadLeft(2, '0'); content.Id = "key" + i; // 标识,增加同标识的索引就是更新 // 增加一个索引(另外还有 Update 和 Delete 操作) await indexer.AddAsync(content); } }