获取磁盘序列号，出现未将对象引用到设置的实例的有关问题
日期：2014-05-17 浏览次数：21224 次
获取磁盘序列号，出现未将对象引用到设置的实例的问题？
代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Management;
namespace Ex189_读取磁盘序列号
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
string hardDiskID = null;
ManagementObjectSearcher searcher = new ManagementObjectSearcher("select * from Win32_logicaldisk");
foreach (ManagementObject id in searcher.Get())
{
hardDiskID = id.GetPropertyValue("VolumeSerialNumber").ToString().Trim();
this.label1.Text += string.Format("磁盘序列号为{0} \t\n", hardDiskID);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
------解决方案--------------------
代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Management;
namespace Ex189_读取磁盘序列号
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
string hardDiskID = null;
ManagementObjectSearcher searcher = new ManagementObjectSearcher("select * from Win32_logicaldisk");
foreach (ManagementObject id in searcher.Get())
{
hardDiskID = id.GetPropertyValue("VolumeSerialNumber").ToString().Trim();
this.label1.Text += string.Format("磁盘序列号为{0} \t\n", hardDiskID);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
------解决方案--------------------
- C# code
//获取硬盘的物理id号
public static string getDiskMac()
{
try
{
string HDid = null;
ManagementClass cimobject = new ManagementClass("Win32_DiskDrive");
ManagementObjectCollection moc = cimobject.GetInstances();
foreach(ManagementObject mo in moc)
{
HDid = (string)mo.Properties["PNPDeviceID"].Value;
break;
}
return HDid;
}
catch
{
return "";
}
}
------解决方案--------------------
对于一些比如光驱之类的介质，当还没有被加载时，GetPropertyValue("VolumeSerialNumber")会返回null，直接ToString()自然会报错。
object o = id.GetPropertyValue("VolumeSerialNumber");
if(o != null)
{
hardDiskID = o.ToString().Trim();
this.label1.Text += string.Format("磁盘序列号为{0} \t\n", hardDiskID);
}
------解决方案--------------------
- C# code
private List<string> GetMoc()
{
List<string> str_list = new List<string>();
ManagementClass mcCpu = new ManagementClass("win32_Processor");
//ManagementObjectCollection mocCpu = mcCpu.GetInstances();
//foreach (ManagementObject m in mocCpu)
//{
// str[0] = m["ProcessorId"].ToString();
//}
ManagementClass mcHD = new ManagementClass("win32_logicaldisk");
ManagementObjectCollection mocHD = mcHD.GetInstances();
foreach (ManagementObject m in mocHD)
{
str_list.Add(m["DeviceID"].ToString() + ":" + m["VolumeSerialNumber"].ToString());
}
return str_list;
}
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