.net 单个配置键的多个值
我试图使用.net 单个配置键的多个值,.net,asp.net,configuration,.net,Asp.net,Configuration,我试图使用ConfigurationManager.AppSettings.GetValues()检索单个键的多个配置值,但我总是只接收最后一个值的数组。我的appsettings.config看起来像 <add key="mykey" value="A"/> <add key="mykey" value="B"/> <add key="mykey" value="C"/> 但是我只得到了{“C”} 关于如何解决这个问题有什么想法吗?你想做什么是不可能的。您
ConfigurationManager.AppSettings.GetValues()
检索单个键的多个配置值,但我总是只接收最后一个值的数组。我的appsettings.config
看起来像
<add key="mykey" value="A"/>
<add key="mykey" value="B"/>
<add key="mykey" value="C"/>
但是我只得到了{“C”}
关于如何解决这个问题有什么想法吗?你想做什么是不可能的。您必须以不同的方式命名每个键,或者执行类似value=“A,B,C”的操作,并在code
string values=value.split(',')
中分离出不同的值
它将始终拾取上次定义的键的值(在您的示例C中)。试试看
<add key="mykey" value="A,B,C"/>
配置文件将每一行视为一个赋值,这就是为什么您只看到最后一行。当它读取配置时,它会给你的键分配一个值“A”,然后是“B”,然后是“C”,因为“C”是最后一个值,所以它会粘住
正如@Kevin所建议的,最好的方法可能是一个内容为CSV的值,您可以对其进行解析。我认为,您可以使用自定义配置节因为
ConfigurationManager.AppSettings.GetValues()
方法不起作用,我使用了以下解决方法来获得类似的效果,但是需要在键后面加上唯一的索引
var name = "myKey";
var uniqueKeys = ConfigurationManager.AppSettings.Keys.OfType<string>().Where(
key => key.StartsWith(name + '[', StringComparison.InvariantCultureIgnoreCase)
);
var values = uniqueKeys.Select(key => ConfigurationManager.AppSettings[key]);
var name=“myKey”;
var uniqueKeys=ConfigurationManager.AppSettings.Keys.OfType()。其中(
key=>key.StartsWith(name+'[',StringComparison.InvariantCultureIgnoreCase)
);
var values=uniqueKeys.Select(key=>ConfigurationManager.AppSettings[key]);
这将匹配像
myKey[0]
和myKey[1]
这样的键。我知道我迟到了,但我找到了这个解决方案,它非常有效,所以我只想与大家分享
这都是关于定义自己的ConfigurationElement
namespace Configuration.Helpers
{
public class ValueElement : ConfigurationElement
{
[ConfigurationProperty("name", IsKey = true, IsRequired = true)]
public string Name
{
get { return (string) this["name"]; }
}
}
public class ValueElementCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new ValueElement();
}
protected override object GetElementKey(ConfigurationElement element)
{
return ((ValueElement)element).Name;
}
}
public class MultipleValuesSection : ConfigurationSection
{
[ConfigurationProperty("Values")]
public ValueElementCollection Values
{
get { return (ValueElementCollection)this["Values"]; }
}
}
}
在app.config中,只需使用新的部分:
<configSections>
<section name="PreRequest" type="Configuration.Helpers.MultipleValuesSection,
Configuration.Helpers" requirePermission="false" />
</configSections>
<PreRequest>
<Values>
<add name="C++"/>
<add name="Some Application"/>
</Values>
</PreRequest>
最后,感谢原的作者,以下是完整的解决方案:
aspx.cs中的代码
namespace HelloWorld
{
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
UrlRetrieverSection UrlAddresses = (UrlRetrieverSection)ConfigurationManager.GetSection("urlAddresses");
}
}
public class UrlRetrieverSection : ConfigurationSection
{
[ConfigurationProperty("", IsDefaultCollection = true,IsRequired =true)]
public UrlCollection UrlAddresses
{
get
{
return (UrlCollection)this[""];
}
set
{
this[""] = value;
}
}
}
public class UrlCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new UrlElement();
}
protected override object GetElementKey(ConfigurationElement element)
{
return ((UrlElement)element).Name;
}
}
public class UrlElement : ConfigurationElement
{
[ConfigurationProperty("name", IsRequired = true, IsKey = true)]
public string Name
{
get
{
return (string)this["name"];
}
set
{
this["name"] = value;
}
}
[ConfigurationProperty("url", IsRequired = true)]
public string Url
{
get
{
return (string)this["url"];
}
set
{
this["url"] = value;
}
}
}
}
和在web配置中
<configSections>
<section name="urlAddresses" type="HelloWorld.UrlRetrieverSection" />
</configSections>
<urlAddresses>
<add name="Google" url="http://www.google.com" />
<add name="Yahoo" url="http://www.yahoo.com" />
<add name="Hotmail" url="http://www.hotmail.com/" />
</urlAddresses>
我对JJS回复的看法:
配置文件:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="List1" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
<section name="List2" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<List1>
<add key="p-Teapot" />
<add key="p-drongo" />
<add key="p-heyho" />
<add key="p-bob" />
<add key="p-Black Adder" />
</List1>
<List2>
<add key="s-Teapot" />
<add key="s-drongo" />
<add key="s-heyho" />
<add key="s-bob"/>
<add key="s-Black Adder" />
</List2>
</configuration>
在我看来,这是很简单的。请随意证明我错了:)我使用钥匙的命名约定,它就像一个符咒
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="section1" type="System.Configuration.NameValueSectionHandler"/>
</configSections>
<section1>
<add key="keyname1" value="value1"/>
<add key="keyname21" value="value21"/>
<add key="keyname22" value="value22"/>
</section1>
</configuration>
var section1=ConfigurationManager.GetSection(“section1”)作为NameValueCollection;
对于(int i=0;i
我发现解决方案非常简单。如果所有键都具有相同的值,只需使用唯一的值作为键,并忽略该值
<configSections>
<section name="appSettings" type="System.Configuration.AppSettingsSection, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" restartOnExternalChanges="false" requirePermission="false"/>
<section name="filelist" type="System.Configuration.AppSettingsSection, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" restartOnExternalChanges="false" requirePermission="false"/>
</configSections>
<filelist>
<add key="\\C$\Temp\File01.txt"></add>
<add key="\\C$\Temp\File02.txt"></add>
<add key="\\C$\Temp\File03.txt"></add>
<add key="\\C$\Temp\File04.txt"></add>
<add key="\\C$\Temp\File05.txt"></add>
<add key="\\C$\Temp\File06.txt"></add>
<add key="\\C$\Temp\File07.txt"></add>
<add key="\\C$\Temp\File08.txt"></add>
</filelist>
那么,ConfigurationManager.AppSettings.GetValues()
有什么意义呢?@Yuck one质疑底层NameValueCollection类的意义——它支持每个键多个值,但实际上不允许每个键设置多个值(AppSettings必须在内部使用set indexer)-这是问题的真正原因,而不是GetValues()只返回一个值。如果只有一个值,则会出现任何未找到的字符错误?ConfigurationManager.ConnectionString使您能够在否定此问题的所有答案的列表中循环(我知道它不是连接字符串,但您可以这样使用它)感谢CubeJockey进行重新对齐。这是一个很好的标准检索,通过指定键和值,我认为这是最干净的解决方案。它还允许可能已经包含许多常用分隔符的值。我实现了它并解决了我的问题,我不必担心有一天可能需要一个值使用一个特定的分隔符。
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="List1" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
<section name="List2" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<List1>
<add key="p-Teapot" />
<add key="p-drongo" />
<add key="p-heyho" />
<add key="p-bob" />
<add key="p-Black Adder" />
</List1>
<List2>
<add key="s-Teapot" />
<add key="s-drongo" />
<add key="s-heyho" />
<add key="s-bob"/>
<add key="s-Black Adder" />
</List2>
</configuration>
private void button1_Click(object sender, EventArgs e)
{
string[] output = CollectFromConfig("List1");
foreach (string key in output) label1.Text += key + Environment.NewLine;
label1.Text += Environment.NewLine;
output = CollectFromConfig("List2");
foreach (string key in output) label1.Text += key + Environment.NewLine;
}
private string[] CollectFromConfig(string key)
{
NameValueCollection keyCollection = (NameValueCollection)ConfigurationManager.GetSection(key);
return keyCollection.AllKeys;
}
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="section1" type="System.Configuration.NameValueSectionHandler"/>
</configSections>
<section1>
<add key="keyname1" value="value1"/>
<add key="keyname21" value="value21"/>
<add key="keyname22" value="value22"/>
</section1>
</configuration>
var section1 = ConfigurationManager.GetSection("section1") as NameValueCollection;
for (int i = 0; i < section1.AllKeys.Length; i++)
{
//if you define the key is unique then use == operator
if (section1.AllKeys[i] == "keyName1")
{
// process keyName1
}
// if you define the key as a list, starting with the same name, then use string StartWith function
if (section1.AllKeys[i].Startwith("keyName2"))
{
// AllKeys start with keyName2 will be processed here
}
}
<configSections>
<section name="appSettings" type="System.Configuration.AppSettingsSection, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" restartOnExternalChanges="false" requirePermission="false"/>
<section name="filelist" type="System.Configuration.AppSettingsSection, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" restartOnExternalChanges="false" requirePermission="false"/>
</configSections>
<filelist>
<add key="\\C$\Temp\File01.txt"></add>
<add key="\\C$\Temp\File02.txt"></add>
<add key="\\C$\Temp\File03.txt"></add>
<add key="\\C$\Temp\File04.txt"></add>
<add key="\\C$\Temp\File05.txt"></add>
<add key="\\C$\Temp\File06.txt"></add>
<add key="\\C$\Temp\File07.txt"></add>
<add key="\\C$\Temp\File08.txt"></add>
</filelist>
private static List<string> GetSection(string section)
{
NameValueCollection sectionValues = ConfigurationManager.GetSection(section) as NameValueCollection;
return sectionValues.AllKeys.ToList();
}