Question

我正在尝试更改实例中的count属性，xml低于

<ServiceConfiguration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" serviceName="" osFamily="1" osVersion="*"      
xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration">
<Role name="WebRole1">
    <ConfigurationSettings>
       <Setting name="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" />
    </ConfigurationSettings>
    <Instances count="1" />
    <Certificates />
</Role>
</ServiceConfiguration>

我在另一个问题中尝试了以下内容，但是我收到错误“对象引用未设置为对象的实例。”

changeConfigXDoc.Root.Element("ServiceConfiguration").Element("Role").Element("Instances").Attribute("count").Value=ChangeInstanceText.Text;

Answer 1

Root是<ServiceConfiguration />节点，请尝试这样做：

changeConfigXDoc.Root.Element("Role")
                     .Element("Instances")
                     .Attribute("count").Value = ChangeInstanceText.Text;

添加these extension methods，然后尝试此操作，

changeConfigXDoc.Root.Set("Role/Instances/count", ChangeInstanceText.Text, true);

Answer 2

您应该考虑名称空间

XNamespace ns = XNamespace.Get("http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration");
changeConfigXDoc
    .Element(ns + "ServiceConfiguration")
    .Element(ns + "Role")
    .Element(ns + "Instances")
    .Attribute("count").Value = ChangeInstanceText.Text;

或者

XNamespace ns = XNamespace.Get("http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration");
changeConfigXDoc
    .Descendants(ns+"Instances")
    .First()
    .Attribute("count").Value = "666";

在XML中设置属性值

2 个答案: