我编写了一个函数，该函数生成HTML电子邮件并用数据库中的信息填充它。
我一直在尝试遍历列表，但似乎无法使该函数具有通用性，并且无法遍历Items列表。
这是电子邮件生成器功能。它相当通用，因此可以在各种电子邮件模板中使用。
public interface IMailObject
{
string Subject { get; }
}
public interface IEmailGenerator
{
MailMessage generateEmail(IMailObject mailObject, string htmlTemplate, string textTemplate);
}
public class EmailGenerator : IEmailGenerator, IRegisterInIoC
{
private string mergeTemplate(string template, object obj)
{
Regex operationParser = new Regex(@"\$(?:(?<operation>[\w\-\,\.]+)\x20)(?<value>[\w\-\,\.]+)\$", RegexOptions.Compiled);
Regex valueParser = new Regex(@"\$(?<value>[\w\-\,\.]+)\$", RegexOptions.Compiled);
var operationMatches = operationParser.Matches(template).Cast<Match>().Reverse().ToList();
foreach (var match in operationMatches)
{
string operation = match.Groups["operation"].Value;
string value = match.Groups["value"].Value;
var propertyInfo = obj.GetType().GetProperty(value);
if (propertyInfo == null)
throw new TillitException(String.Format("Could not find '{0}' in object of type '{1}'.", value, obj));
object dataValue = propertyInfo.GetValue(obj, null);
if (operation == "endforeach")
{
string foreachToken = "$foreach " + value + "$";
var startIndex = template.LastIndexOf(foreachToken, match.Index);
var templateBlock = template.Substring(startIndex + foreachToken.Length, match.Index - startIndex - foreachToken.Length);
var items = (IEnumerable) value;
string blockResult = "";
foreach (object item in items)
{
blockResult += mergeTemplate(templateBlock, item);
}
template = template.Remove(startIndex, match.Index - startIndex).Insert(startIndex, blockResult);
}
}
var valueMatches = valueParser.Matches(template).Cast<Match>().Reverse().ToList();
foreach (var match in valueMatches)
{
string value = match.Groups["value"].Value;
var propertyInfo = obj.GetType().GetProperty(value);
if (propertyInfo == null)
throw new Exception(String.Format("Could not find '{0}' in object of type '{1}'.", value, obj));
object dataValue = propertyInfo.GetValue(obj, null);
template = template.Remove(match.Index, match.Length).Insert(match.Index, dataValue.ToString());
}
return template;
}
public MailMessage generateEmail(IMailObject mailObject, string htmlTemplate, string textTemplate)
{
var mailMessage = new MailMessage();
mailMessage.IsBodyHtml = true;
mailMessage.Subject = mailObject.Subject;
mailMessage.BodyEncoding = Encoding.UTF8;
// Create the Plain Text version of the email
mailMessage.Body = this.mergeTemplate(textTemplate, mailObject);
// Create the HTML version of the email
ContentType mimeType = new System.Net.Mime.ContentType("text/html");
AlternateView alternate = AlternateView.CreateAlternateViewFromString(this.mergeTemplate(htmlTemplate, mailObject), mimeType);
mailMessage.AlternateViews.Add(alternate);
return mailMessage;
}
}
这是消息数据的一种情况：
public class MessageData : IMailObject
{
public string Property1 { get; private set; }
public string Property2 { get; private set; }
public string Property3 { get; private set; }
public string Property4 { get; private set; }
public string Property5 { get; private set; }
public string Property6 { get; private set; }
public string Subject
{
get { return this.Property1 + DateTime.Now.ToShortDateString(); }
}
public List<MessageItemData> Items { get; private set; }
public MessageData(string property1, string property2, string property3, DateTime property4, string property7, string property8, DateTime property9, DateTime property10, int property11, double property12, string property5, string property6)
{
this.Property1 = property1;
this.Property2 = property2;
this.Property3 = property3;
this.Property4 = property4.ToShortDateString();
this.Property5 = property5;
this.Property6 = property6;
this.Items = new List<MessageItemData>();
this.Items.Add(new MessageItemData(property7, property8, property9, property10, property11, property12));
}
}
public class MessageItemData
{
public string Property7 { get; private set; }
public string Property8 { get; private set; }
public string Property9 { get; private set; }
public string Property10 { get; private set; }
public int Property11 { get; private set; }
public double Property12 { get; private set; }
public MessageItemData( string property7, string property8, DateTime property9, DateTime property10, int property11, double property12)
{
this.Property7 = property7;
this.Property8 = property8;
this.Property9 = property9.ToShortDateString();
this.Property10 = property10.ToShortDateString();
this.Property11 = property11;
this.Property12 = property12;
}
}
仅使用一组元素时，该功能有效。如果我们以MessageData类为例。所有信息都将被正确替换，但我想改进电子邮件生成器功能，因为此特定的MessageData类具有对象列表，其中Property7到Property12将被替换多次。
该函数从以下位置开始：if（operation ==“ endforeach”），但是我需要一些帮助来改进它，以便它可以通过以下方式运行：var items =（IEnumerable）value ;，以便该函数返回TemplateHeader + TemplateItem + TemplateItem + ...但是有许多TemplateItems + TemplateFooter。当前，即使列表中有多个项目，它也仅返回TemplateHeader + TemplateItem + TemplateFooter。
在这种情况下，我假设我需要获取列表项。我一直在尝试将其实施到下面的EmailGenerator中：
var items = (IEnumerable) value;
代码：
if (propertyInfo.PropertyType == typeof(List<>))
{
foreach (var item in items)
{
Console.WriteLine(item);
}
}
Console.WriteLine仅用于测试目的，以查看是否在Debug中获得了任何值（我目前正在获得空值）
答案 0 :(得分：1)
假设在所有实例中 Items 属性的类型都是相同的，您可能想尝试使用 IsInstanceOfType 。然后通过 GetValue 方法获取属性的值。反射有时会造成混乱；），但希望这就是您要寻找的。
var data = new MessageData("a", "b", "c", DateTime.Now, "d", "e", DateTime.Now, DateTime.Now, 1, 2, "f", "g");
data.Items.Add(new MessageItemData("7", "8", DateTime.Now, DateTime.Now, 11, 12));
data.Items.Add(new MessageItemData("71", "81", DateTime.Now, DateTime.Now, 111, 112));
var dataType = data.GetType();
foreach (var propertyInfo in dataType.GetProperties())
{
if (propertyInfo.PropertyType.IsInstanceOfType(data.Items))
{
foreach (var item in (List<MessageItemData>)propertyInfo.GetValue(data))
{
Console.WriteLine(item);
}
}
}