NVelocity ASP.NET示例 [英] NVelocity ASP.NET Examples

问题描述

我期待使用NVelocity在我的ASP.NET MVC应用程序，而不是一个视图引擎，只是呈现了一些电子邮件模板。

I'm looking to use NVelocity in my ASP.NET MVC application, not as a view engine, just for rendering some email templates.

不过，我不能为我的生命得到它的工作。我从城堡项目下载了它，并随后在 HTTP的例子：// WWW。 castleproject.org/others/nvelocity/usingit.html#step1

However, I cannot for the life of me get it to work. I have downloaded it from the castle project and followed the example at http://www.castleproject.org/others/nvelocity/usingit.html#step1

无论我试试我似乎不能够加载位于我的网站模板。这个例子表明，使用绝对路径，我试图无济于事：

No matter what I try I don't seem to be able to load a template located in my site. The example suggests using the absolute path, which I have tried to no avail:

Template t = engine.GetTemplate("/Templates/TestEmail.vm");

所以，请能有人给我两个例子。一加载位于Web站点目录模板其次一个解析字符串变量（因为它可能是我的模板将被存储在数据库中）。

So please can someone give me two examples. One of loading a template located in the web site directory and secondly one parsing a string variable (as it is likely that my templates will be stored in a database).

非常感谢
本

推荐答案

我在我过去的一个项目中使用这个类：

I've used this class in one of my past projects:

public interface ITemplateRepository
{
    string RenderTemplate(string templateName, IDictionary<string, object> data);
    string RenderTemplate(string masterPage, string templateName, IDictionary<string, object> data);
}

public class NVelocityTemplateRepository : ITemplateRepository
{
    private readonly string _templatesPath;

    public NVelocityTemplateRepository(string templatesPath)
    {
        _templatesPath = templatesPath;
    }

    public string RenderTemplate(string templateName, IDictionary<string, object> data)
    {
        return RenderTemplate(null, templateName, data);
    }

    public string RenderTemplate(string masterPage, string templateName, IDictionary<string, object> data)
    {
        if (string.IsNullOrEmpty(templateName))
        {
            throw new ArgumentException("The \"templateName\" parameter must be specified", "templateName");
        }

        var name = !string.IsNullOrEmpty(masterPage)
            ? masterPage : templateName;

        var engine = new VelocityEngine();
        var props = new ExtendedProperties();
        props.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, _templatesPath);
        engine.Init(props);
        var template = engine.GetTemplate(name);
        template.Encoding = Encoding.UTF8.BodyName;
        var context = new VelocityContext();

        var templateData = data ?? new Dictionary<string, object>();
        foreach (var key in templateData.Keys)
        {
            context.Put(key, templateData[key]);
        }

        if (!string.IsNullOrEmpty(masterPage))
        {
            context.Put("childContent", templateName);
        }

        using (var writer = new StringWriter())
        {
            engine.MergeTemplate(name, context, writer);
            return writer.GetStringBuilder().ToString();
        }
    }
}

为了实例需要您的模板根是提供一个绝对路径的 NVelocityTemplateRepository 类。然后，可以使用相对路径来引用 VM 文件。

In order to instantiate the NVelocityTemplateRepository class you need to provide an absolute path where your templates root is. Then you use relative paths to reference your vm files.

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