1. wmi连接前提
利用wmi来连接远端计算机首先要具有远端计算机管理员的用户名和密码。如果计算机在域中的话，要有域管理员用户名和密码，或者是把域帐户加入本机管理员组中也可以。
2. 相关类的用法--- ConnectionOptions和ManagementScope
ConnectionOptions用于设置连接选项，比如设置所连接机器的域，用户名，密码等。ManagementScope用于连接的实际操作。
1: using System; 2: using System.Collections.Generic; 3: using System.Text; 4: using System.Management; 5: 6: namespace TJVictor.WMI 7: { 8: public class WMIBaseClass 9: { 10: #region Property 11: private ConnectionOptions connection; 12: 13: private ManagementScope scope; 14: public ManagementScope Scope 15: { 16: get { return scope; } 17: set { scope = value; } 18: } 19: 20: private string domain; 21: public string Domain 22: { 23: get { return domain; } 24: set { domain = value; } 25: } 26: 27: private string ip; 28: public string Ip 29: { 30: get { return ip; } 31: set { ip = value; } 32: } 33: 34: private string user; 35: public string User 36: { 37: get { return user; } 38: set { user = value; } 39: } 40: 41: private string password; 42: public string Password 43: { 44: get { return password; } 45: set { password = value; } 46: } 47: 48: private string nameSpace; 49: public string NameSpace 50: { 51: get { return nameSpace; } 52: set { nameSpace = value; } 53: } 54: #endregion 55: 56: #region Construction 57: public WMIBaseClass() 58: { 59: this.domain = string.Empty; 60: this.ip = string.Empty; 61: this.user = string.Empty; 62: this.password = string.Empty; 63: this.nameSpace = "root//cimv2"; 64: } 65: 66: public WMIBaseClass(string ip, string user, string password) 67: { 68: this.domain = string.Empty; 69: this.ip = ip; 70: this.user = user; 71: this.password = password; 72: this.nameSpace = "root//cimv2"; 73: } 74: 75: public WMIBaseClass(string domain, string ip, string user, string password) 76: { 77: this.domain = domain; 78: this.ip = ip; 79: this.user = user; 80: this.password = password; 81: this.nameSpace = "root//cimv2"; 82: } 83: 84: public WMIBaseClass(string domain, string ip, string user, string password, string nameSpace) 85: { 86: this.domain = domain; 87: this.ip = ip; 88: this.user = user; 89: this.password = password; 90: this.nameSpace = nameSpace; 91: } 92: #endregion 93: 94: #region protected function 95: protected virtual void Connection() 96: { 97: this.scope = Cache.CacheClass.Get(this.ip) as ManagementScope; 98: if (this.scope == null) 99: { 100: connection = new ConnectionOptions(); 101: if (!domain.Equals(string.Empty)) 102: connection.Authority = "ntlmdomain:" + this.domain; 103: if (!user.Equals(string.Empty)) 104: connection.Username = this.user; 105: if (!password.Equals(string.Empty)) 106: connection.Password = this.password; 107: string temp = string.Empty; 108: if (ip.Equals(string.Empty)) 109: temp = "" + "." + "//" + this.nameSpace;////" + this.ip + "//" + this.nameSpace; 110: else 111: temp = "113: scope = new ManagementScope(temp, connection);115: if (!scope.IsConnected) 116: scope.Connect();118: Cache.CacheClass.Insert(this.ip, scope); 119: } 120: else 121: { 122: if (!scope.IsConnected) 123: scope.Connect(); 124: } 125: } 126: 127: protected virtual void DisConnection(string key) 128: { 129: Cache.CacheClass.Remove(key); 130: } 131: 132: protected virtual ManagementObjectCollection GetSelectQueryCollection(string wqlSelect, string condition) 133: { 134: SelectQuery query = new SelectQuery(string.Format(wqlSelect, condition)); 135: ManagementObjectSearcher mos = new ManagementObjectSearcher(scope, query); 136: return mos.Get(); 137: } 138: 139: protected virtual ManagementObjectSearcher GetObjectSearcher(string wqlSelect, string condition) 140: { 141: SelectQuery query = new SelectQuery(string.Format(wqlSelect, condition)); 142: return new ManagementObjectSearcher(scope, query); 143: } 144: #endregion 145: } 146: }3. 代码说明由于连接远端机器是所有wmi操作的第一步，所以我们把连接wmi作为一个基类，以后所有对wmi操作的类都继承这个类。其中Connection()函数就是建立远端连接。其实很简单，如果只要把域、用户名、密码、IP、wmi命名空间等属性设置完成，就可以利用wmi提供的scope.Connect();来尝试连接远端机器。Wmi中没有释放连接的函数。也就是说，当这个类被GC回收后，远端连接也就自动被释放了，否则与远端机器一直都处于连接状态。