作者：meteors99191 | 来源：互联网 | 2022-11-14 19:52
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
添加引用
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();
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();
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&＃63; $Column.PhysicalColumnName { set; get; }
#end
#end
}
}
常用语法
使用${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 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 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;
}
}
以上就是c#基于NVelocity实现代码生成的详细内容，更多关于NVelocity实现代码生成的资料请关注其它相关文章！
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