获取sqlserverName（计算机名）上所有的数据库名称

/// <summary>
/// 获取sqlserverName（计算机名）上所有的数据库名称
/// </summary>
/// <param name="sqlserverName"></param>
/// <returns></returns>
public static List<string> getAllDataBase(string sqlserverName)
{
List<string> listdatabase = new List<string>();
string connstr = "Data Source=" + sqlserverName + "\\SQLEXPRESS;DataBase=master;Integrated Security=True;User Instance=True";
SqlConnection conn = new SqlConnection(connstr);
using (conn)
{
string cmdtext = "SELECT name FROM master.dbo.sysdatabases WHERE name NOT IN ('master','tempdb','msdb','model')";
SqlCommand cmd = conn.CreateCommand();
conn.Open();
cmd.CommandText = cmdtext;
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
listdatabase.Add(dr.GetString(0));
}
return listdatabase;
}
}