Question

在下面的WMI查询中，如果proptery为空，那么我的代码错误。当属性不存在时，如何使代码返回“”？例如queryObj [“Help Telephone”]为空，所以我的代码出错，但我希望它继续。

ManagementObjectSearcher searcherSoftware = new ManagementObjectSearcher("root\\CIMV2", "Select * from Win32_Product");

foreach (ManagementObject queryObj in searcherSoftware.Get())
{
    ItemsUnderControlObject TemporarySoftware = new ItemsUnderControlObject();
    TemporarySoftware.sType = "Software";
    TemporarySoftware.sAssignmentType = queryObj["AssignmentType"].ToString().Split(new[] { "Name=" }, StringSplitOptions.None).Last().Trim('"'); //http://stackoverflow.com/questions/22583873/get-names-from-string-values/22583919?noredirect=1#22583919
    TemporarySoftware.sCaption = queryObj["Caption"].ToString().Split(new[] { "Name=" }, StringSplitOptions.None).Last().Trim('"');
    TemporarySoftware.sDescription = queryObj["Description"].ToString().Split(new[] { "Name=" }, StringSplitOptions.None).Last().Trim('"');
    TemporarySoftware.sHelpLink = queryObj["HelpLink"].ToString().Split(new[] { "Name=" }, StringSplitOptions.None).Last().Trim('"');
    TemporarySoftware.sHelpTelephone = queryObj["Help Telephone"].ToString().Split(new[] { "Name=" }, StringSplitOptions.None).Last().Trim('"');
}

Answer 1

您可以创建辅助方法：

private static string GetNameContents(ManagementObject queryObj, string propertyName)
{
    object propertyValue = queryObj[propertyName];
    if (propertyValue == null)
        return String.Empty;
    string propertyString = propertyValue.ToString();
    return propertyString.Length == 0
        ? String.Empty
        : propertyString.Split(new[] { "Name=" }, StringSplitOptions.None).Last().Trim('"');
}

使用如下：

TemporarySoftware.sAssignmentType = GetNameContents(queryObj, "AssignmentType");
TemporarySoftware.sCaption = GetNameContents(queryObj, "Caption");

WMI查询空属性

1 个答案: