本文整理汇总了C#中ISet.Cast方法的典型用法代码示例。如果您正苦于以下问题：C# ISet.Cast方法的具体用法？C# ISet.Cast怎么用？C# ISet.Cast使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ISet的用法示例。
在下文中一共展示了ISet.Cast方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: GetUserProfiles
/// <summary>
/// Gets multiple user profiles by their Ids.
/// </summary>
public async Task<IEnumerable<UserProfile>> GetUserProfiles(ISet<Guid> userIds)
{
if (userIds == null || userIds.Count == 0) return Enumerable.Empty<UserProfile>();
// Since we're essentially doing a multi-get here, limit the number userIds (i.e. partition keys) to 20 in an attempt
// to enforce some performance sanity. Anything larger and we might want to consider a different data model that doesn't
// involve doing a multi-get
if (userIds.Count > 20) throw new ArgumentOutOfRangeException("userIds", "Cannot do multi-get on more than 20 user id keys.");
// As an example, we'll do the multi-get at the CQL level using an IN() clause (i.e. let Cassandra handle it). For an example of
// doing it at the driver level, see the VideoReadModel.GetVideoPreviews method
// Build a parameterized CQL statement with an IN clause
var parameterList = string.Join(", ", Enumerable.Repeat("?", userIds.Count));
var statement =
new SimpleStatement(string.Format("SELECT userid, firstname, lastname, email FROM users WHERE userid IN ({0})", parameterList));
statement.Bind(userIds.Cast<object>().ToArray());
// Execute and map to UserProfile object
RowSet resultRows = await _session.ExecuteAsync(statement).ConfigureAwait(false);
return resultRows.Select(MapRowToUserProfile).ToList();
}