ASP.NET Boilerplate 邮件类使用

在系统我们自定一个 MySettingProvider,并添加到配置集合中，定义一些邮件参数覆盖默认参数，然后通过IOC容器得到SmtpEmailSender实例，调用send方法就实现了，实现代码如下：

1.自定义配置类

public class MySettingProvider : SettingProvider
{
    public override IEnumerable<SettingDefinition> GetSettingDefinitions(SettingDefinitionProviderContext context)
    {
        return new[]
        {
            new SettingDefinition(EmailSettingNames.Smtp.Host, "smtp.qq.com"),
            new SettingDefinition(EmailSettingNames.Smtp.Port,"25"),
            new SettingDefinition(EmailSettingNames.DefaultFromAddress,"834663884@qq.com"),
            new SettingDefinition(EmailSettingNames.Smtp.UserName,"834663884@qq.com"),
            new SettingDefinition(EmailSettingNames.Smtp.Password,""),
            new SettingDefinition(EmailSettingNames.Smtp.UseDefaultCredentials,"false"),
            new SettingDefinition(EmailSettingNames.DefaultFromDisplayName,"shuangjie"), 

            new SettingDefinition(
                       AbpZeroSettingNames.UserManagement.IsEmailConfirmationRequiredForLogin,
                       "true",
                       new FixedLocalizableString("Is email confirmation required for login."),
                       scopes: SettingScopes.Application | SettingScopes.Tenant
                       )
        };
    }
  }

2.添加到配置集合，加到模块初始化类里就行

Configuration.Settings.Providers.Add<MySettingProvider>();

3.使用SmtpEmailSender

var emailSender = IocManager.Instance.Resolve<ISmtpEmailSender>();
emailSender.Send(message.Destination, message.Subject, message.Body);

4.下面将框架是如何实现这些操作的

在SmtpEmailSender的构造函数中注入了ISmtpEmailSenderConfiguration，它的实现类是SmtpEmailSenderConfiguration，通过他我们的Send方法得到我们需要的邮箱配置，那让我们看究竟做了什么

public class SmtpEmailSenderConfiguration : EmailSenderConfiguration, ISmtpEmailSenderConfiguration, ITransientDependency
{
    public string Host
    {
        get { return GetNotEmptySettingValue(EmailSettingNames.Smtp.Host); }
    }

    public int Port
    {
        get { return SettingManager.GetSettingValue<int>(EmailSettingNames.Smtp.Port); }
    }
    ....

他通过SettingManager的GetSettingValue方法来得到一些配置的值，SettingManager字段，GetNotEmptySettingValue方法来自EmailSenderConfiguration，这里就不粘它的代码了，GetNotEmptySettingValue也是通过SettingManager.GetSettingValue的方式来获得配置数据的，GetSettingValue是SettingManager的扩展方法，接下来就让我看看SettingManager类

public class SettingManager : ISettingManager, ISingletonDependency
{

    public Task<string> GetSettingValueAsync(string name)
    {
        return GetSettingValueInternalAsync(name, AbpSession.TenantId, AbpSession.UserId);
    }

    private async Task<string> GetSettingValueInternalAsync(string name, int? tenantId = null, long? userId = null)
    {
        var settingDefinition = _settingDefinitionManager.GetSettingDefinition(name);

        //Get for user if defined
        if (settingDefinition.Scopes.HasFlag(SettingScopes.User) && userId.HasValue)
        {

SettingScope是枚举，有三个值分别是Application、TenantId、UserId，在这里不讲，通过代码们看到获取配置的方法是_settingDefinitionManager的GetSettingDefinition，返回结果是SettingDefinition，这个类主要用来保存Name、Value等等属性，我们要看的是GetSettingDefinition方法，代码如下

internal class SettingDefinitionManager : ISettingDefinitionManager, ISingletonDependency
{
    public void Initialize()
    {
        var context = new SettingDefinitionProviderContext();

        foreach (var providerType in _settingsConfiguration.Providers)
        {
            var provider = CreateProvider(providerType);
            foreach (var settings in provider.GetSettingDefinitions(context))
            {
                _settings[settings.Name] = settings;
            }
        }
    }

    public SettingDefinition GetSettingDefinition(string name)
    {
        SettingDefinition settingDefinition;
        if (!_settings.TryGetValue(name, out settingDefinition))
        {
            throw new AbpException("There is no setting defined with name: " + name);
        }

        return settingDefinition;
    }

通过代码我们看到SettingDefinition来自Provider，也就是我们自定义或默认已有的SettingProvider类，这个类有个方法GetSettingDefinitions，通过它来得到我们的配置，SettingDefinitionManager的Initialize会在程序启动时被调用，详看AbpKernelModule,这个初始化方法就得到了所有的SettingDefinition，这就是大概流程，因为在AbpKernelModule添加的的SettingProvider会早于我们自定义的SettingProvider，所以我们的会覆盖默认的。

到此结束！