如何检查 PropertyDataCollection 中是否存在值？

Question

我有一个使用 WMI 从服务器收集信息的类。问题是某些版本的 Windows 似乎有不同的可用/缺失属性，我似乎无法找到一种方法来检查集合以查看值是否存在，然后再尝试访问它们的值。

需要明确的是，我发现可以使用 wmiSingle.Properties.GetEnumerator() 遍历整个集合并检查每个属性名称值 - 但必须有更好的方法。对？

ManagementScope wmiScope = new ManagementScope("\\\\MyLaptop\\root\\cimv2");
ObjectQuery wmiVolumeQuery = new System.Management.ObjectQuery("SELECT * FROM Win32_Processor");

using (ManagementObjectSearcher wmiObjectSearcher = new ManagementObjectSearcher(wmiScope, wmiVolumeQuery))
{
    using (ManagementObjectCollection wmiMany = wmiObjectSearcher.Get())
    {
        foreach (ManagementObject wmiSingle in wmiMany)
        {
            Console.WriteLine(wmiSingle["Name"]);

            //This line will throw an exception. How do I test to see if
            //  "SomeProperty" exists before attempting to access the value?
            //Console.WriteLine(wmiSingle["SomeProperty"]);
            object somePropertyValue = wmiSingle.GetPropertyValue("SomeProperty");
        }
    }
}

Answer 1

我相信检查这一点的唯一方法是遍历属性

foreach (var prop in wmiSingle.Properties)
{
    if(prop.Name == "SomeProperty")
    { /* do something */ }        
}

您也可以捕获异常 - 像这样

public static class Extensions
{
    public static object TryGetProperty(this System.Management.ManagementObject wmiObj, string propertyName)
    {
        object retval;
        try
        {
            retval = wmiObj.GetPropertyValue(propertyName);
        }
        catch (System.Management.ManagementException ex)
        {
            retval = null;
        }
        return retval;
    }
}

故意/故意引发异常通常效率不高；但是，也不是遍历整个集合以查找单个属性。