如何创建一个JSON字符串与键/值对从web.配置appsettings

Question

我需要循环通过web的应用程序设置集合。配置并在JSON字符串中添加键值对。我用的是JSON.Net。我如何在for循环内准备一个JSON字符串?谢谢你！

foreach (string key in ConfigurationManager.AppSettings)
{
    string value = ConfigurationManager.AppSettings[key];
}

Answer 1

因为AppSettings是一个NameValueCollection，所以你不能直接将它转换为Json。您应该从中填充一个Dictionary，并使用JsonConvert类对其进行序列化:

Dictionary<string, string> items = new Dictionary<string, string>();
foreach (string key in ConfigurationManager.AppSettings) {
    string value = ConfigurationManager.AppSettings[key];
    items.Add(key, value);
}
string json = JsonConvert.SerializeObject(items, Formatting.Indented);

Answer 2

扩展Mehrzad Chehraz的答案，对于那些不需要遍历AppSettings键的人:

public string GetJsonNetSerializedString()
{
    var keys = ConfigurationManager.AppSettings.AllKeys
        .Select(key => new 
        { 
            Key = key, 
            Value = ConfigurationManager.AppSettings[key] 
        });
    string json = JsonConvert.SerializeObject(keys, Formatting.Indented);
    return json;
}