MES-ETL/MesETL.App/Options/TenantDbOptions.cs

namespace ConsoleApp2.Options;

public class TenantDbOptions
{
    public string? TenantKey { get; set; }

    /// <summary>
    /// Key-Value: {DbName}-{TenantKeyLessThan}
    /// </summary>
    public Dictionary<string, int>? DbList { get; set; }

    public string GetDbNameByTenantKeyValue(int tenantKeyValue)
    {
        // var dictionary = new SortedDictionary<int, string>();
        // DbList.ForEach(pair => dictionary.Add(pair.Value, pair.Key));
        // 注意配置顺序
        if(DbList is null) throw new ApplicationException("分库配置中没有发现任何数据库");
        var dbName = DbList.Cast<KeyValuePair<string, int>?>()
            .FirstOrDefault(pair => pair?.Value != null && pair.Value.Value > tenantKeyValue)!.Value.Key;
        return dbName ??
               throw new ArgumentOutOfRangeException(nameof(tenantKeyValue),
                   $"分库配置中没有任何符合'{nameof(tenantKeyValue)}'值的数据库");
    }
}