Catel可以让你更方便的配置所有的平台

下面的表格解释了每个平台使用何种技术来获取和存储配置值。

1 从配置中获取值

   使用如下代码从配置中获取值：

var configurationService = new ConfigurationService();
var mySetting = configurationService.GetValue<int>("mySetting", 42);

注意：

It‘s best to retrieve the service from the dependency resolver or let it be injected into the classes using it

2 设置值到配置项目中

  使用如下的代码存储值到配置中：

var configurationService = new ConfigurationService();
configurationService.SetValue("mySetting", 42);

注意：

It‘s best to retrieve the service from the dependency resolver or let it be injected into the classes using it

3 自定义值的存储方式

ConfigurationService是用于扩展的，尽管他默认的是.NET的本地存储系统，它很容易的去创建自定义服务，下面是一个创建自定义服务来存储或者读取数据库的例子。

public class DbConfigurationService : ConfigurationService
{
    protected override bool ValueExists(string key)
    {
        using (var context = new ConfigurationContext())
        {
            return (from config in context.Configurations
                    where config.Key == key
                    select config).Any();
        }
    }

    protected override string GetValueFromStore(string key)
    {
        using (var context = new ConfigurationContext())
        {
            return (from config in context.Configurations
                    where config.Key == key
                    select config.Value).First();
        }
    }

    protected override void SetValueToStore(string key, string value)
    {
        using (var context = new ConfigurationContext())
        {
            var configuration (from config in context.Configurations
                    where config.Key == key
                    select config).FirstOrDefault();

            if (configuration == null)
            {
                configuration = context.CreateObject<Configuration>();
                configuration.Key = key;
            }

            configuration.Value = value;
            context.SaveChanges();
        }
    }
}

注意：

  不要忘记在ServiceLocator中注册自定义的ConfigurationService.