Title: Creating and writing ASP.NET 2.0 custom configuration Sections
终极管理员 知识笔记 123阅读
ASP .网络2.0使得创建自定义配置部件变得非常好，并且这些配置部件可以通过代码访问。基本上可以实现一个新的配置部分类。例如，我为我的数据库资源提供者构建了一个配置部分。如此：公共类wwdbresourceprovider部分：配置部分{[配置属性(' ConnectionString '默认值=' '))、描述('用于连接数据库资源提供程序的连接字符串)]public string ConnectionString=' MsoNormal ' { get { return this[' ConnectionString ']as string；} set { this[' connectionString ']=value；} }[配置属性('资源表名'默认值='本地化')，Des
cription("The name of the table used in the Connection String database for localizations.")]
public string ResourceTableName
{
get { return this["resourceTableName"] as string; }
set { this["resourceTableName"] = value; }
}
[ConfigurationProperty("designTimeVirtualPath",DefaultValue=""),
Description("The virtual path to the application. This value is used at design time and should be in the format of: /MyVirtual")]
public string DesignTimeVirtualPath
{
get { return this["designTimeVirtualPath"] as string; }
set { this["designTimeVirtualPath"] = value; }
}
…
public wwDbResourceProviderSection(string ConnectionString, string ResourceTableName, string DesignTimeVirtualPath)
{
this.ConnectionString = ConnectionString;
this.DesignTimeVirtualPath = DesignTimeVirtualPath;
this.ResourceTableName = ResourceTableName;
}
public wwDbResourceProviderSection()
{
}
}
And create your ‘properties’ for the section by simply creating public properties and marking them up with a few attributes. The whole thing can then be stuck into web.config like this:
<configSections>
<section name="wwDbResourceProvider"
type="Westwind.Globalization.wwDbResourceProviderSection"
/>
</configSections>
<wwDbResourceProvider
connectionString="server=(local);database=Internationalization;integrated security=true;"
resourceTableName="Localizations"
designTimeVirtualPath="/internationalization"
localizationFormWebPath="~/localizationadmin/localizeform.aspx"
addMissingResources="false"
useVsNetResourceNaming="false"
showLocalizationControlOptions="false"
showControlIcons="true"
/>
Nice.
However, I’ve not been able to figure out how to write data back to the config the ConfigurationSection interface. This class representation supports the ability to save the content, but when I try to assign a value like so:
protected void Page_Load(object sender, EventArgs e)
{
object T = WebConfigurationManager.GetWebApplicationSection("wwDbResourceProvider") ;
if (T != null)
{
wwDbResourceProviderSection Section = T as wwDbResourceProviderSection;
Response.Write(Section.ConnectionString);
Section.ShowControlIcons = false;
}
}
I get an exception that the configuration is read only.
Exception Details: System.Configuration.ConfigurationErrorsException: The configuration is read only.
As it turns out the code to write this needs to look a little differently:
protected void Page_Load(object sender, EventArgs e)
{
Configuration config = WebConfigurationManager.OpenWebConfiguration("~");
wwDbResourceProviderSection Section = config.GetSection("wwDbResourceProvider") as wwDbResourceProviderSection;
Section.ShowControlIcons = true;
config.Save();
return;
}
And this works…
As long as you’re running at least with High Trust permissions. This understandably fails with Medium trust.