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NVelocity实现代码生成

在框架开发过程中,通用代码生成是一项必不可少的功能,c#在这后端模板引擎这方面第三方组件较少,我这里选择的是NVelocity,现在升级到了NetStandard2.0,可以用于NetCore项目

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NVelocity实现代码生成NVelocity实现代码生成

初始化模板引擎及设置模板读取路径

            vltEngine = new VelocityEngine();             vltEngine.SetProperty(RuntimeConstants.RESOURCE_LOADER, "file");             vltEngine.SetProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, CloudUtil.GetContentPath() + "/" + "Template");             vltEngine.Init();

NVelocity实现代码生成

读取模板渲染结果

 VelocityContext vltContext = new VelocityContext();             foreach (var item in RenderDataDic)             {                 vltContext.Put(item.Key, item.Value);             }             Template vltTemplate = vltEngine.GetTemplate(TemplateFileName);             System.IO.StringWriter vltWriter = new System.IO.StringWriter();             vltTemplate.Merge(vltContext, vltWriter);             string CodeContent = vltWriter.GetStringBuilder().ToString();

NVelocity实现代码生成

模板语法

示例Entity模板

using FastORM.Attribute; using FastORM.Entity; using System; using System.Collections.Generic; using System.Text;  namespace ${NameSpace}.Entity {     [Table(Name = "${TablePhysicalNameLowCase}")]     public class ${TablePhysicalName} : BaseEntity     {         [Key]         public string RowGuid { set; get; }         #foreach( $Column in $ColumnList)         #if (($Column.ColumnType == 10 || $Column.ColumnType ==  50) && $Column.PhysicalColumnName!="RowGuid")         public string $Column.PhysicalColumnName { set; get; }         #end         #if ($Column.ColumnType == 20 && $Column.PhysicalColumnName!="RowGuid")         public int $Column.PhysicalColumnName { set; get; }         #end         #if ($Column.ColumnType == 30 && $Column.PhysicalColumnName!="RowGuid")         public decimal $Column.PhysicalColumnName { set; get; }         #end         #if ($Column.ColumnType == 40 && $Column.PhysicalColumnName!="RowGuid")         public DateTime? $Column.PhysicalColumnName { set; get; }         #end         #end     } }

NVelocity实现代码生成

常用语法

使用${xxx}占位替换具体字符串内容

使用 #foreach( $Itemin $ItemList)  #end 来进行循环渲染

使用 #if #end 来进行分支判断渲染

完整工具类代码

public class TemplateUtil     {         private static VelocityEngine vltEngine;         public static string CodeTempPath;          private static void InitTemplateSetting()         {             CodeTempPath = AppConfigUtil.Configuration["Frame:GenerateCodeTemplatePath"];             DirectoryInfo CodePath = new DirectoryInfo(CloudUtil.GetContentStaticFilePath() + CodeTempPath);             if (!CodePath.Exists)             {                 CodePath.Create();             }             vltEngine = new VelocityEngine();             vltEngine.SetProperty(RuntimeConstants.RESOURCE_LOADER, "file");             vltEngine.SetProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, CloudUtil.GetContentPath() + "/" + "Template");             vltEngine.Init();         }          public static string GeneratemeplateFile(string FileID, string TableName, string TemplateFileName, string CodeFileName, Dictionary<string, object> RenderDataDic)         {             InitTemplateSetting();             DirectoryInfo CodePath = new DirectoryInfo(CloudUtil.GetContentStaticFilePath() + CodeTempPath + "/" + FileID);             if (!CodePath.Exists)             {                 CodePath.Create();             }             CodePath = new DirectoryInfo(CloudUtil.GetContentStaticFilePath() + CodeTempPath + "/" + FileID + "/" + TableName);             if (!CodePath.Exists)             {                 CodePath.Create();             }             VelocityContext vltContext = new VelocityContext();             foreach (var item in RenderDataDic)             {                 vltContext.Put(item.Key, item.Value);             }             Template vltTemplate = vltEngine.GetTemplate(TemplateFileName);             System.IO.StringWriter vltWriter = new System.IO.StringWriter();             vltTemplate.Merge(vltContext, vltWriter);             string CodeContent = vltWriter.GetStringBuilder().ToString();             string CodeFilePath = CloudUtil.GetContentStaticFilePath() + CodeTempPath + "/" + FileID + "/" + TableName + "/" + CodeFileName;             //保存生成后的代码内容到文件             FileUtil.SaveStringToFile(CodeFilePath, CodeContent);             return CodeFilePath;         }          public static string GenerateTemplateContent(string TemplateFileName, Dictionary<string, object> RenderDataDic)         {             InitTemplateSetting();             VelocityContext vltContext = new VelocityContext();             foreach (var item in RenderDataDic)             {                 vltContext.Put(item.Key, item.Value);             }             Template vltTemplate = vltEngine.GetTemplate(TemplateFileName);             System.IO.StringWriter vltWriter = new System.IO.StringWriter();             vltTemplate.Merge(vltContext, vltWriter);             string CodeContent = vltWriter.GetStringBuilder().ToString();             return CodeContent;         }     }

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