/// <summary>
/// 绑定配置根包含的默认租户配置节（支持加密连接字符串）。
/// </summary>
/// <examples>
/// JSON 配置节点结构参考：
/// <code>
/// {
/// "DefaultTenant": {
/// "Name": "name",
/// "Host": "host",
/// "DefaultConnectionString": "default connection string",
/// "WritingConnectionString": "writing connection string",
/// "WritingSeparation": true // or false
/// }
/// }
/// </code>
/// </examples>
/// <exception cref="ArgumentNullException">
/// this.ConfigurationRoot is null.
/// </exception>
/// <param name="validateFactory">给定用于验证连接字符串的工厂方法（可选）。</param>
/// <returns>返回 <see cref="DataBuilderDependency"/>。</returns>
public virtual DataBuilderDependency BindDefaultTenant(Func <string, string> validateFactory = null)
{
ConfigurationRoot.NotNull(nameof(ConfigurationRoot));
return(BindDefaultTenant(ConfigurationRoot.GetSection(DefaultTenantSectionName), validateFactory));
}