每个配置文件中的部分只能出现一次！为什么？

Question

我收到以下异常： "每个配置文件的部分只能出现一次。有关例外情况，请参阅帮助主题。"

我的配置文件如下所示：

<configSections>
    <sectionGroup name="point.System">
        <section name="singleInstanceCache"
            type="xyz.Point.System.Configuration.SingleInstanceCache, Point.System" />
    </sectionGroup>
    <sectionGroup name="point.Services">
        <sectionGroup name="xServices" type="xyz.Point.Messaging.PointServiceConfiguration.PointServices, Barcap.FIA.Point.Messaging">
            <section name="xService"
                type="xyz.Point.Messaging.PointServiceConfiguration.PointService, Barcap.FIA.Point.Messaging" />
        </sectionGroup>
    </sectionGroup>
</configSections>

<point.Services>
    <xServices>
        <xService name="Service1" type="IService" >
            <endpoints>
                <endpoint aliasName="incoming" endpointName="Subscriber"/>
                <endpoint aliasName="outgoing" endpointName="Publisher"/>
            </endpoints>
        </xService>
        <xService name="BlobService" type="IPortfolioService" >
            <endpoints>
                <endpoint aliasName="incoming" endpointName="Subscriber"/>
                <endpoint aliasName="outgoing" endpointName="Publisher"/>
            </endpoints>
        </xService>
    </xServices>
</point.Services>

这是我加载它的代码：

public class PointServices : ConfigurationSection
{
    public static PointServices Get()
    {
        var t = (PointServices)ConfigurationManager.GetSection("point.Services/xServices");

        return null;
    }

    //<summary>
    //Declares a collection element represented in the following configuration sub-section
    //<singleInstances> <add .../> </singleInstances> 
    //</summary>
    [ConfigurationProperty("xServices", IsDefaultCollection = true)]
    [ConfigurationCollection(typeof(PointServices), AddItemName = "xService")]
    public PointServicesCollection Services
    {
        get { return (PointServicesCollection) base["xServices"]; }
    }
}

public class PointService : ConfigurationElement
{
    [ConfigurationProperty("name",IsRequired = true)]
    public string Name
    {
        get { return this["name"].ToString(); }
    }

    [ConfigurationProperty("type", IsRequired = true)]
    public string Type
    {
        get { return this["type"].ToString(); }
    }

    [ConfigurationProperty("endpoints", IsRequired = false)]
    [ConfigurationCollection(typeof(EndpointAliasCollection), AddItemName = "endpoint")]
    public EndpointAliasCollection Endpoints
    {
        get { return (EndpointAliasCollection)this["endpoints"]; }
    }
}

如果您知道我为什么会收到此错误，那将很有帮助。

谢谢

Answer 1

您正在尝试将部分组用作集合，并将部分用作集合中的项目，这不是它们的用途，因此会出现错误。

基本上你只需要将point.Services定义为一个section，因为它不需要包含任何其他section，然后定义一个collection属性来包含配置元素。您可以按如下方式更新代码：

配置：

<configSections>
    <section name="point.Services" 
        type="xyz.Point.Messaging.PointServiceConfiguration.PointServices, Barcap.FIA.Point.Messaging" />
</configSections>

<point.Services>
    <xServices>
        <xService name="Service1" type="IService" >
            <endpoints>
                <endpoint aliasName="incoming" endpointName="Subscriber"/>
                <endpoint aliasName="outgoing" endpointName="Publisher"/>
            </endpoints>
        </xService>
        <xService name="BlobService" type="IPortfolioService" >
            <endpoints>
                <endpoint aliasName="incoming" endpointName="Subscriber"/>
                <endpoint aliasName="outgoing" endpointName="Publisher"/>
            </endpoints>
        </xService>
    </xServices>
</point.Services>

那么代码是：

public class PointServices : ConfigurationSection
{
    public static PointServices Get()
    {
        return (PointServices) ConfigurationManager.GetSection("point.Services");
    }

    [ConfigurationProperty("xServices", IsDefaultCollection = true)]
    [ConfigurationCollection(typeof(PointService), AddItemName = "xService")]
    public PointServicesCollection Services
    {
        get { return (PointServicesCollection) base["xServices"]; }
    }
}

public class PointService : ConfigurationElement
{
    [ConfigurationProperty("name", IsRequired = true)]
    public string Name
    {
        get { return this["name"].ToString(); }
    }

    [ConfigurationProperty("type", IsRequired = true)]
    public string Type
    {
        get { return this["type"].ToString(); }
    }

    [ConfigurationProperty("endpoints", IsRequired = false)]
    [ConfigurationCollection(typeof(EndpointAlias), AddItemName = "endpoint")]
    public EndpointAliasCollection Endpoints
    {
        get { return (EndpointAliasCollection) this["endpoints"]; }
    }
}

分解：

• PointServices 是映射到 部分的配置部分，因此静态 Get() 方法反映了这一点
• PointServices 定义了一个集合属性 Services，它是一个 PointServiceCollection，其中项类型是 PointService（不是 PointServices），并且映射到元素名称 xService
• PointService 元素是元素而不是部分，再次注意集合属性属性定义项目类型，而不是容器类型

希望对您有所帮助。

Answer 2

Point.System 在配置文件中的什么位置？它可能只是在抱怨，因为 0 != 1（对计算机）