11

I have a console application that is trying to load a CustomConfigurationSection from a web.config file.

The custom configuration section has a custom configuration element that is required. This means that when I load the config section, I expect to see an exception if that config element is not present in the config. The problem is that the .NET framework seems to be completely ignoring the isRequired attribute. So when I load the config section, I just creates an instance of the custom configuration element and sets it on the config section.

My question is, why is this happening? I want the GetSection() method to fire a ConfigurationErrors exception since a required element is missing from the configuration.

Here is how my config section looks. 

public class MyConfigSection : ConfigurationSection
{
    [ConfigurationProperty("MyConfigElement", IsRequired = true)]
    public MyConfigElement MyElement
    {
        get { return (MyConfigElement) this["MyConfigElement"]; }
    }
}
public class MyConfigElement : ConfigurationElement
{
    [ConfigurationProperty("MyAttribute", IsRequired = true)]
    public string MyAttribute
    {
        get { return this["MyAttribute"].ToString(); }
    }
}

Here is how I load the config section.

   class Program
    {
        public static Configuration OpenConfigFile(string configPath)
        {
            var configFile = new FileInfo(configPath);
            var vdm = new VirtualDirectoryMapping(configFile.DirectoryName, true, configFile.Name);
            var wcfm = new WebConfigurationFileMap();
            wcfm.VirtualDirectories.Add("/", vdm);
            return WebConfigurationManager.OpenMappedWebConfiguration(wcfm, "/");
        }

        static void Main(string[] args)
        {
            try{
                string path = @"C:\Users\vrybak\Desktop\Web.config";

                var configManager = OpenConfigFile(path);
                var configSection = configManager.GetSection("MyConfigSection") as MyConfigSection;

                MyConfigElement elem = configSection.MyElement;
            } catch (ConfigurationErrorsException ex){
                Console.WriteLine(ex.ToString());
            }
        }

Here is what my config file looks like.

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="MyConfigSection" type="configurationFrameworkTestHarness.MyConfigSection, configurationFrameworkTestHarness" />
  </configSections>

  <MyConfigSection>

  </MyConfigSection>

The wierd part is that if I open the config file and load the section 2 times in a row, I will get the exception that I expect. 

var configManager = OpenConfigFile(path);
var configSection = configManager.GetSection("MyConfigSection") as MyConfigSection;
configManager = OpenConfigFile(path);
configSection = configManager.GetSection("MyConfigSection") as MyConfigSection;

If I use the code above, then the exception will fire and tell me that MyConfigElement is required. The question is Why is it not throwing this exception the first time??

4

3 に答える 3

4

これに対する最善の回避策は、ConfigurationElementタイプのネストされたすべてのプロパティを手動で反復処理し、セクションを取得した後でそれらを自分で確認することであることがわかりました。要素が必要であるがファイルに存在しない場合は、ConfigurationErrorsExceptionをスローします。

これが私のコードです。

private void ProcessMissingElements(ConfigurationElement element)
{
    foreach (PropertyInformation propertyInformation in element.ElementInformation.Properties)
    {
        var complexProperty = propertyInformation.Value as ConfigurationElement;
        if (complexProperty == null) 
            continue;

        if (propertyInformation.IsRequired && !complexProperty.ElementInformation.IsPresent)
            throw new ConfigurationErrorsException("ConfigProperty: [{0}] is required but not present".FormatStr(propertyInformation.Name));
        if (!complexProperty.ElementInformation.IsPresent)
            propertyInformation.Value = null;
        else
            ProcessMissingElements(complexProperty);
    }
}
于 2010-03-22T12:31:06.153 に答える
3

エリックはMS フォーラムでこれに答えました

彼の答えを引用するには：

ConfigurationPropertyAttributeのIsRequiredメンバーは、子オブジェクト (ConfigurationElement から派生) に適用されると機能しません。

于 2010-03-19T06:36:21.030 に答える
0

正しいタイプの変数、つまり var ではなく MyConfigSection に直接割り当てようとしましたか? これが、2 行のコードの唯一の違いです。(つまり、2 行目で、var は特定の型を取得しています)。

于 2010-03-22T12:12:42.703 に答える