ConfigurationSection - StringValidator失败 [英] ConfigurationSection - StringValidator failing

问题描述

我想在自定义元素中的ASP.NET web.config文件中存储三个值，因此这是我的web.config：

 < code><？xml version =1.0？> 
< configuration> 
< configSections> 
< section name =mySectiontype =Foobar.MySection，Foobar/> 
< / configSections> 
 
< mySection baseUri =https：// blarghsid =123key =abc/> 
 
<！ -  etc，包括< system.web>配置 - > 
< / config> 
  

这是我的配置代码：

 命名空间Foobar {
 
 public class MySection：ConfigurationSection {
 
 public MySection（）{
} 
 
 [ConfigurationProperty（baseUri，IsRequired = true）] 
 [StringValidator（MinLength = 1）] 
 public String BaseUri {
 get {return（String）this [baseUri] ; } 
 set {this [baseUri] = value; } 
} 
 
 [ConfigurationProperty（sid，IsRequired = true）] 
 [StringValidator（MinLength = 1）] 
 public String Sid {
 get {return（String）this [sid]; } 
 set {this [sid] = value; } 
} 
 
 [ConfigurationProperty（key，IsRequired = true）] 
 [StringValidator（MinLength = 1）] 
 public String Key {
 get {return（String）this [key]; } 
 set {this [key] = value; } 
} 
} 
} 
  

此代码：

  MySection section = ConfigurationManager.GetSection（mySection）as MySection; 
 String x = section.BaseUri;但是当我在ASP.NET中运行我的代码时，我得到这个异常：
 $ b 
 
 $ b 
  [ArgumentException：字符串长度必须至少为1个字符。] 
 System.Configuration.StringValidator.Validate（Object value）+679298 
 System.Configuration.ConfigurationProperty.Validate（对象值）+41 
 
 [ConfigurationErrorsException：属性'baseUri'的值无效。错误是：字符串必须至少为1个字符长。] 
 System.Configuration.BaseConfigurationRecord.CallCreateSection（Boolean inputIsTrusted，FactoryRecord factoryRecord，SectionRecord sectionRecord，Object parentConfig，ConfigXmlReader reader，String filename，Int32 line）+278 
 System.Configuration.BaseConfigurationRecord.CreateSectionDefault（String configKey，Boolean getRuntimeObject，FactoryRecord factoryRecord，SectionRecord sectionRecord，Object& result，Object& resultRuntimeObject）+59 
 System.Configuration.BaseConfigurationRecord.GetSectionRecursive（String configKey，Boolean getLkg，Boolean checkPermission，Boolean getRuntimeObject，Boolean requestIsHere，Object& result，Object& resultRuntimeObject）+1431 
 System.Configuration.BaseConfigurationRecord.GetSection（String configKey，Boolean getLkg，Boolean checkPermission）+56 
系统。 Configuration.BaseConfigurationRecord.GetSection（String configKey）+8 
 System.Web.HttpContext.GetSection（String sectionName）+47 
 System.Web.Configuration.HttpConfigurationSystem.GetSection（String sectionName）+39 
 System.Web.Configuration.HttpConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection（String configKey）+6 
 System.Configuration.ConfigurationManager.GetSection（String sectionName）+78 
< my code that调用GetSection> 
 
为什么在web.config中设置正确格式的值时StringValidator会失败？  
因为 StringValidator 是我忽略的原因，所以我忽略了什么？
解决方案
异常我做了一些googling，显然是一个在.NET框架中的错误：有一个 StringValidator 与最小长度参数意味着它将总是拒绝空字符串属性的默认值，将由框架设置。
 
 
 
有解决方法，花费时间在他们，所以我剥离了 StringValidator 属性，我的代码工作正常。
 
 
 
这里的QA我发现：为什么StringValidator对于自定义配置部分总是失败？ 
 
I want to store three values in my ASP.NET web.config file in a custom element, so this is my web.config:
<?xml version="1.0"?>
<configuration>
    <configSections>
        <section name="mySection" type="Foobar.MySection,Foobar" />
    </configSections>

    <mySection baseUri="https://blargh" sid="123" key="abc" />

    <!-- etc, including <system.web> configuration -->
</configuration>
This is my Configuration code:
namespace Foobar {

public class MySection : ConfigurationSection {

    public MySection () {
    }

    [ConfigurationProperty("baseUri", IsRequired=true)]
    [StringValidator(MinLength=1)]
    public String BaseUri {
        get { return (String)this["baseUri"]; }
        set { this["baseUri"] = value; }
    }

    [ConfigurationProperty("sid", IsRequired=true)]
    [StringValidator(MinLength=1)]
    public String Sid {
        get { return (String)this["sid"]; }
        set { this["sid"] = value; }
    }

    [ConfigurationProperty("key", IsRequired=true)]
    [StringValidator(MinLength=1)]
    public String Key {
        get { return (String)this["key"]; }
        set { this["key"] = value; }
    }
}
}
And I load it using this code:
MySection section = ConfigurationManager.GetSection("mySection") as MySection;
String x = section.BaseUri;
However when I run my code in ASP.NET I get this exception:
[ArgumentException: The string must be at least 1 characters long.]
System.Configuration.StringValidator.Validate(Object value) +679298
System.Configuration.ConfigurationProperty.Validate(Object value) +41

[ConfigurationErrorsException: The value for the property 'baseUri' is not valid. The error is: The string must be at least 1 characters long.]
System.Configuration.BaseConfigurationRecord.CallCreateSection(Boolean inputIsTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader, String filename, Int32 line) +278
System.Configuration.BaseConfigurationRecord.CreateSectionDefault(String configKey, Boolean getRuntimeObject, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object& result, Object& resultRuntimeObject) +59
System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject) +1431
System.Configuration.BaseConfigurationRecord.GetSection(String configKey, Boolean getLkg, Boolean checkPermission) +56
System.Configuration.BaseConfigurationRecord.GetSection(String configKey) +8
System.Web.HttpContext.GetSection(String sectionName) +47
System.Web.Configuration.HttpConfigurationSystem.GetSection(String sectionName) +39
System.Web.Configuration.HttpConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String configKey) +6
System.Configuration.ConfigurationManager.GetSection(String sectionName) +78
<my code that calls GetSection>
Why would the StringValidator be failing when the correctly-formatted value is set in my web.config? What am I overlooking?
解决方案
Because StringValidator is the cause of the exceptions I did some googling and apparently it's a bug in the .NET Framework: having a StringValidator with a Minimum Length argument means that it will always reject the empty string "" default value of the property, which would be set by the framework.

There are workarounds, but I couldn't justify spending time on them, so I stripped out the StringValidator attributes and my code works fine now.

Here's the QA I found: Why does StringValidator always fail for custom configuration section?

                        
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