C# 獲取當前操做系統是32位仍是64位

注：判斷整型的長度的方式，只有在AnyCPU編譯模式下才有用。所以更好的辦法是獲取真的地址總線位寬（使用WMI，windows management instruementation）。

 

.NET 2.0

add reference, System.Management

using System.Management;
...

        public static int GetOSBit()
        {
            try
            {
                string addressWidth = String.Empty;
                ConnectionOptions mConnOption = new ConnectionOptions();
                ManagementScope mMs = new ManagementScope(@"\\localhost", mConnOption);
                ObjectQuery mQuery = new ObjectQuery("select AddressWidth from Win32_Processor");
                ManagementObjectSearcher mSearcher = new ManagementObjectSearcher(mMs, mQuery);
                ManagementObjectCollection mObjectCollection = mSearcher.Get();
                foreach (ManagementObject mObject in mObjectCollection)
                {
                    addressWidth = mObject["AddressWidth"].ToString();
                }
                return Int32.Parse(addressWidth);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                return 32;
            }
        }