我正在尝试通过代码在Facebook应用程序中设置web.config设置,以避免直接使用web.config文件.
我尝试了一个自定义ConfigurationSection类,然后使用WebConfigurationManager来访问web.config文件.问题是我无法获得Configuration对象的实例.这是我的代码：

public class FacebookConfigurationSection : ConfigurationSection
{
[ConfigurationProperty("appId")]
public string AppID
{
    get { return (string)base["appId"]; }
    set { base["appId"] = value; }
}

[ConfigurationProperty("appSecret")]
public string AppSecret
{
    get { return (string)base["appSecret"]; }
    set { base["appSecret"] = value; }
}

[ConfigurationProperty("canvasPage")]
public string CanvasPage
{
    get { return (string)base["canvasPage"]; }
    set { base["canvasPage"] = value; }
}

[ConfigurationProperty("canvasUrl")]
public string CanvasUrl
{
    get { return (string)base["canvasUrl"]; }
    set { base["canvasUrl"] = value; }
}

[ConfigurationProperty("cancelUrlPath")]
public string CancelUrlPath
{
    get { return (string)base["cancelUrlPath"]; }
    set { base["cancelUrlPath"] = value; }
}

public FacebookConfigurationSection()
{
}

}

以及使用该页面的页面：

protected void Button1_Click(object sender, EventArgs e)
{
    Configuration config = WebConfigurationManager.OpenWebConfiguration("~");

    FacebookConfigurationSection _config = new FacebookConfigurationSection(); 
    _config = config.GetSection("facebookSettings") as FacebookConfigurationSection;

    //FacebookConfigurationSection config = (FacebookConfigurationSection)System.Configuration.ConfigurationManager.GetSection("facebookSettings");
    if (!string.IsNullOrEmpty(TextBox1.Text))
        _config.AppID = TextBox1.Text.ToString();

    if (!string.IsNullOrEmpty(TextBox2.Text))
        _config.AppSecret = TextBox2.Text.ToString();

    if (!string.IsNullOrEmpty(TextBox3.Text))
        _config.CanvasPage = TextBox3.Text.ToString();

    if (!string.IsNullOrEmpty(TextBox4.Text))
        _config.CanvasUrl = TextBox4.Text.ToString();

    _config.CancelUrlPath = "";
    config.Save();
}

web.config看起来像这样(我正在尝试使用的部分)：

<configSections>
    <section type="Facebook.FacebookConfigurationSection, Facebook" name="facebookSettings" allowLocation="true" allowDefinition="Everywhere"/>
</configSections>

<facebookSettings
  appId = "xxxxxxxxxxxxxxx"
  appSecret = "xxxxxxxxxxxxxxxxxxxxxxxxx"
  canvasPage = "xxxxxxxxxxxxxxxxxx"
  canvasUrl ="xxxxxxxxxxxxxxxxxx"
  cancelUrlPath = "" />

这样做给了我“对象引用未设置为对象的实例”.在_config上,它告诉我什么也没有返回.

有什么“特定于Facebook”的原因吗？

另一件事;我在代码中遇到了使用Facebook设置的这种新方法：

FacebookContext.SetApplication( IFacebookApplication )

我还没有找到一个使用此示例的好例子.
以前有没有人为此工作过？

解决方法:

只需使用

var sec = ConfigurationManager.GetSection("facebookSettings"); 

FacebookConfigurationSection config = (sec as Facebook.FacebookConfigurationSection); 

config.AppID等