C#中构造函数无参和有参作用及区别

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C#中构造函数作用，在实例化对象的时候，有一个默认构造函数，即无参构造函数和有参构造函数作用，以及区别，同时在程序运行时候，先调用哪一个？代码如实： using System; namespace SysModel { /// <summary> /// 分公司管理信息表 /// </summary> [Serializable] public partial class branchcompany { public branchcompany() { } public branchcompany(int __id, string __companyname) { _id = __id; _companyname = __companyname; } #region Model private int _id; private string _companyname; private string _person ; private string _tel; private string _email; private int _memgrade = 0; private int _senditrvalue = 0; /// <summary> /// 自增ID /// </summary> public int id { set { _id = value; } get { return _id; } } /// <summary> /// 分公司名称 /// </summary> public string companyname { set { _companyname = value; } get { return _companyname; } } /// <summary> /// 联系人 /// </summary> public string person { set { _person = value; } get { return _person; } } /// <summary> /// 电话 /// </summary> public string tel { set { _tel = value; } get { return _tel; } } /// <summary> /// 邮箱 /// </summary> public string email { set { _email = value; } get { return _email; } } /// <summary> /// 注册等级 /// </summary> public int memgrade { set { _memgrade = value; } get { return _memgrade; } } /// <summary> /// 注册送积分 /// </summary> public int senditrvalue { set { _senditrvalue = value; } get { return _senditrvalue; } } #endregion Model } }