MonoRail学习笔记十八:在VM中可以使用哪些系统变量
我们知道在vm中可以直接使用Session、SiteRoot等,那么我们还可以使用哪些默认的系统变量呢?
其实可以直接在vm中使用的系统变量都是在NVelocityViewEngine类的CreateContext方法中定义的。下面我们就看看到底定义了哪些(详见代码中的注释说明):
其实可以直接在vm中使用的系统变量都是在NVelocityViewEngine类的CreateContext方法中定义的。下面我们就看看到底定义了哪些(详见代码中的注释说明):
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private IContext CreateContext(IRailsEngineContext context, Controller controller)
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{
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Hashtable innerContext = new Hashtable(StringComparer.InvariantCultureIgnoreCase);
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//对应的controller中的方法和属性可以直接在vm中使用
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innerContext.Add(TemplateKeys.Controller, controller);
//当前请求的上下文,请求,Session等可以直接使用
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innerContext.Add(TemplateKeys.Context, context);
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innerContext.Add(TemplateKeys.Request, context.Request);
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innerContext.Add(TemplateKeys.Response, context.Response);
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innerContext.Add(TemplateKeys.Session, context.Session);
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//对应的controller中的Resources中所有资源可以直接在vm中使用
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if (controller.Resources != null)
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{
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foreach(String key in controller.Resources.Keys)
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{
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innerContext[key] = controller.Resources[key];
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}
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}
18![](/Images/OutliningIndicators/InBlock.gif)
//所有Params中的值可以直接在vm中使用
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foreach(String key in context.Params.AllKeys)
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{
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if (key == null) continue; // Nasty bug?
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object value = context.Params[key];
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if (value == null) continue;
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innerContext[key] = value;
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}
26![](/Images/OutliningIndicators/InBlock.gif)
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// list from : http://msdn2.microsoft.com/en-us/library/hfa3fa08.aspx
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object[] builtInHelpers =
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new object[]
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{
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new StaticAccessorHelper<Byte>(),
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new StaticAccessorHelper<SByte>(),
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new StaticAccessorHelper<Int16>(),
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new StaticAccessorHelper<Int32>(),
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new StaticAccessorHelper<Int64>(),
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new StaticAccessorHelper<UInt16>(),
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new StaticAccessorHelper<UInt32>(),
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new StaticAccessorHelper<UInt64>(),
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new StaticAccessorHelper<Single>(),
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new StaticAccessorHelper<Double>(),
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new StaticAccessorHelper<Boolean>(),
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new StaticAccessorHelper<Char>(),
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new StaticAccessorHelper<Decimal>(),
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new StaticAccessorHelper<String>(),
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new StaticAccessorHelper<Guid>(),
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new StaticAccessorHelper<DateTime>()
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};
48![](/Images/OutliningIndicators/InBlock.gif)
//常见的系统类可以之间使用,比如可以直接在vm中使用$Int32.MaxValue
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foreach(object helper in builtInHelpers)
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{
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innerContext[helper.GetType().GetGenericArguments()[0].Name] = helper;
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}
53![](/Images/OutliningIndicators/InBlock.gif)
//定义的Helper类可以直接在vm中使用
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if (controller.Helpers != null)
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{
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foreach (object key in controller.Helpers.Keys)
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{
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innerContext[key] = controller.Helpers[key];
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}
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}
61![](/Images/OutliningIndicators/InBlock.gif)
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// Adding flash as a collection and each individual item
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//定义的Flash值可以直接使用
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if (context.Flash != null)
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{
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innerContext[Flash.FlashKey] = context.Flash;
67![](/Images/OutliningIndicators/InBlock.gif)
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foreach(DictionaryEntry entry in context.Flash)
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{
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if (entry.Value == null) continue;
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innerContext[entry.Key] = entry.Value;
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}
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}
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//定义的PropertyBag值可以直接使用
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if (controller.PropertyBag != null)
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{
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foreach(DictionaryEntry entry in controller.PropertyBag)
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{
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if (entry.Value == null) continue;
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innerContext[entry.Key] = entry.Value;
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}
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}
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//SiteRoot可以直接使用 ---取得的是应用程序的路径
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innerContext[TemplateKeys.SiteRoot] = context.ApplicationPath;
85![](/Images/OutliningIndicators/InBlock.gif)
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return new VelocityContext(innerContext);
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}
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//当前请求的上下文,请求,Session等可以直接使用
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![](/Images/OutliningIndicators/InBlock.gif)
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//对应的controller中的Resources中所有资源可以直接在vm中使用
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//所有Params中的值可以直接在vm中使用
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![](/Images/OutliningIndicators/InBlock.gif)
//常见的系统类可以之间使用,比如可以直接在vm中使用$Int32.MaxValue
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
//定义的Helper类可以直接在vm中使用
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