Question

http://msdn.microsoft.com/en-us/library/system.configuration.configurationpropertyattribute.aspx

Immutable types as configuration properties

在QueueID下面的QueueConfiguration类中，返回一个int。当我运行代码时，我在访问getter时遇到此错误：无法解析属性“queueID”的值。错误是：无法找到支持转换为/从字符串转换为'Int32'类型的属性'queueID'的转换器。

如果我更改QueueID以返回一个字符串，它可以正常工作。请注意，在上面引用的microsoft链接中，不需要使用typeconverter将port属性作为int返回。我想我错过了一些明显的东西......

public class QueueConfiguration : ConfigurationSection
{
    [ConfigurationProperty("queueID", DefaultValue = (int)0, IsKey = true, IsRequired = true)]        
    public int QueueID
    {
        get 
        {
            return (int)this["queueID"];
        }
        set { this["queueID"] = value; }
    }

    [ConfigurationProperty("queueName", DefaultValue = "", IsKey = false, IsRequired = true)]
    public string QueueName
    {
        get { return (string)this["queueName"]; }
        set { this["queueName"] = value; }
    }
}


public class QueueConfigurationCollection : ConfigurationElementCollection
{
    internal const string PropertyName = "QueueConfiguration";

    public override ConfigurationElementCollectionType CollectionType
    {
        get
        {
            return ConfigurationElementCollectionType.BasicMapAlternate;
        }
    }

    protected override string ElementName
    {
        get
        {
            return PropertyName;
        }
    }

    protected override bool IsElementName(string elementName)
    {
        return elementName.Equals(PropertyName, StringComparison.InvariantCultureIgnoreCase);
    }


    public override bool IsReadOnly()
    {
        return false;
    }


    protected override ConfigurationElement CreateNewElement()
    {
        return new QueueConfiguration();
    }

    protected override object GetElementKey(ConfigurationElement element)
    {
        return ((QueueConfiguration)(element)).QueueID;
    }

    public QueueConfiguration this[int idx]
    {
        get
        {
            return (QueueConfiguration)BaseGet(idx);
        }
    }
}

public class QueueConfigurationSection : ConfigurationSection
{
    [ConfigurationProperty("Queues")]
    public QueueConfigurationCollection Queues
    {
        get { return ((QueueConfigurationCollection)(this["Queues"])); }
        set { this["Queues"] = value; }
    }
}

这是我的App.config（由于某种原因，该网站拒绝显示app config的configSection部分，所以我会尽力打破它：

<configSections>
 <section name="QueueConfigurations" type="STPMonitor.Common.QueueConfigurationSection, STPMonitor"/> 
</configSections>

<QueueConfigurations>
<Queues>
  <QueueConfiguration queueID="1" queueName="One"></QueueConfiguration>
  <QueueConfiguration queueID="2" queueName="Two"></QueueConfiguration>
</Queues>
</QueueConfigurations>

Answer 1

好吧，我只是复制粘贴并尝试了你的代码，它没有任何错误。我的阅读代码是：

var section = ConfigurationManager.GetSection("QueueConfigurations") as QueueConfigurationSection;
var queueId = section.Queues[0].QueueID;
Console.Out.WriteLine("queueId = {0}", queueId);

并打印queueId = 1

这里有要点：https://gist.github.com/b8499dcfa7456624f073

无法将ConfigurationProperty转换为int

1 个答案: