public UserEntity  GetUserInfo(List<DataSource>  dataSources)
{
    var xxxx = new UserEntity();
    if(dataSources.Any(DataSource.Local)
    {
        //從本地緩存中獲取
        return xxxx;
    }
 
    if(dataSources.Any(DataSource.Distribution)
    {
        //從分布式緩存中獲取
        //更新本地緩存
        return xxxx;
    }
 
    if(dataSources.Any(DataSource.DB)
    {
        //從DB中獲取
        //更新分布式緩存
        //更新本地緩存
    }
    return xxxx;
}

/// <summary>
///  數(shù)據(jù)取得地方
/// </summary>
[Flags]
public enum DataSource
{
    /// <summary>
    ///     本地緩存
    /// </summary>
    [Description("本地緩存")]
    LocalCache = 1,
 
    /// <summary>
    ///    分布式緩存
    /// </summary>
    [Description("分布式緩存")]
    DistributeCache = 2,
 
    /// <summary>
    ///     數(shù)據(jù)庫
    /// </summary>
    [Description("數(shù)據(jù)庫")]
    DB = 4,
}

public UserEntity  GetUserInfo(DataSource dataSources)
{
    var xxxx = new UserEntity();
    if(dataSources.HasFlags(DataSource.Local)
    {
        //從本地緩存中獲取
        return xxxx;
    }
 
    if(dataSources.HasFlags(DataSource.Distribution)
    {
        //從分布式緩存中獲取
        //更新本地緩存
        return xxxx;
    }
 
    if(dataSources.HasFlags(DataSource.DB)
    {
        //從DB中獲取
        //更新分布式緩存
        //更新本地緩存
    }
    return xxxx;
}

var userInfo = GetUserInfo(DataSource.Distribution | DataSource.DB);