关于C#：自定义app.config列表在applicationconfiguration.getsection()上产生错误

Custom app.config list producing error on ApplicationConfiguration.GetSection()

背景：尝试按照以下示例在app.config中实现列表：

http://jopinblog.wordpress.com/2007/04/20/custom-configurationsections-in-net-20-config-files/
http://social.msdn.microsoft.com/forums/en/csharpgeneral/thread/0f3557ee-16bd-4a36-a4f3-00efbeae9b0d
带有"添加"元素的简单列表的自定义app.config部分
app.config的自定义配置-节的集合？

目标：我正在寻求解决此错误并使其正常工作。

错误：

Unrecognized element 'lookupMapping'. (C: ...line 75)

调试过程中在此行上产生错误：

lookupMappingConfigSection部分=(lookupMappingConfigSection)config.sections["lookupMappings"]；

app.config代码段：

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Classes：

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public class LookupMappingsInstanceElement : ConfigurationElement
{
[ConfigurationProperty("name", IsRequired = true)]
public string Name
{
get { return (string)base["name"]; }
set { base["name"] = value; }
}

[ConfigurationProperty("lookupName", IsRequired = true)]
public string LookupName
{
get { return (string)base["lookupName"]; }
set { base["lookupName"] = value; }
}
}

public class LookupMappingsConfigSection: ConfigurationSection
{
[ConfigurationProperty("lookupMappings", IsDefaultCollection = true, IsRequired = true)]
[ConfigurationCollection(typeof(LookupMappingsConfigCollection), AddItemName ="lookupMapping")]
public LookupMappingsConfigCollection Instances
{
get { return (LookupMappingsConfigCollection) this[""]; }
set { this[""] = value; }
}
}

public class LookupMappingsConfigCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new LookupMappingsInstanceElement();
}

protected override object GetElementKey(ConfigurationElement element)
{
return ((LookupMappingsInstanceElement) element).Name;
}

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

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

protected override string ElementName
{
get { return"lookupMapping"; }
}
}

实施C：

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Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
LookupMappingsConfigSection section = (LookupMappingsConfigSection)config.Sections["lookupMappings"]; // <--ERROR ON THIS LINE
LookupMappingsInstanceElement entry1 = section.Instances[0];
LookupMappingsInstanceElement entry2 = section.Instances[1];

相关讨论

好啊。根据帖子，我的名称空间和程序集在app.config部分中是不正确的。我还必须在app.config中添加一个额外的分组，这样它才能很好地播放。这是我的最终产品，以防它帮助其他人。

App.CONFIG

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C类

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public class LookupMappingsConfigSection: ConfigurationSection
{
[ConfigurationProperty("LookupMappings")]
public LookupMappingsConfigCollection LookupMappings
{
get { return ((LookupMappingsConfigCollection)(base["LookupMappings"])); }
}
}

[ConfigurationCollection(typeof(LookupMappingElement))]
public class LookupMappingsConfigCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new LookupMappingElement();
}

protected override object GetElementKey(ConfigurationElement element)
{
return ((LookupMappingElement) element).Name;
}

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

}

public class LookupMappingElement : ConfigurationElement
{
[ConfigurationProperty("name", DefaultValue ="",IsKey = true)]
public string Name
{
get { return (string)base["name"]; }
set { base["name"] = value; }
}

[ConfigurationProperty("lookupName", DefaultValue ="", IsKey = false, IsRequired = false)]
public string LookupName
{
get { return (string)this["lookupName"]; }
set { base["lookupName"] = value; }
}
}

//Get the lookup entries
LookupMappingsConfigSection section = (LookupMappingsConfigSection)ConfigurationManager.GetSection("LookupMappingsSection");
foreach(LookupMappingElement lookupMapping in section.LookupMappings)
{
//Do something
}

主要问题是，您正试图将您的lookupMappings部分作为标准AppSettingsSection加载。将配置文件更改为：

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NOTE: You'll need to replace Fully.Qualified.Type.Of.LookupMappingsConfigSectionType and Name.Of.Assembly.Containing.LookupMappingsConfigSectionType with the appropriate type and assembly names.

配置节定义无效。它应该指向实现lookupMappingConfigSection的完全限定名。

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自定义配置部分的名称空间是什么？

我从你写的配置文件中看到：

1	type="System.Configuration.AppSettingsSection, System.Configuration, Version=4.0.30319.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

这不应该是这样的吗？

1	type="your.namespace.LookupMappingsConfigSection, your.assembly" ?

对于自定义配置节，还可以签出配置节设计器