using System; 
using System.Text; 
using System.CodeDom; 
using System.IO;

namespace RazorDemo 
{ 
    public class CodedomDemo 
    { 
        public CodeCompileUnit CrateCodeCompileUnit() 
        { 
            var testClass = new CodeTypeDeclaration("Test"); 
            var testMeth = new CodeMemberMethod() 
            { 
                Attributes = MemberAttributes.Public| MemberAttributes.Final, 
                Name = "SayHello", 
            }; 
            var param = new CodeParameterDeclarationExpression(new CodeTypeReference(typeof(string)), "name"); 
            testMeth.Parameters.Add(param); 
            testClass.Members.Add(testMeth);

var nowExpression = new CodePropertyReferenceExpression(new CodePropertyReferenceExpression(new CodeTypeReferenceExpression(typeof(DateTime)), "Now"), "Hour"); 
            var assmon = new CodeBinaryOperatorExpression(new CodePrimitiveExpression("早上好:"), CodeBinaryOperatorType.Add, new CodeArgumentReferenceExpression("name") ); 
            var asslunch = new CodeBinaryOperatorExpression(new CodePrimitiveExpression("中午好:"), CodeBinaryOperatorType.Add, new CodeArgumentReferenceExpression("name")); 
            var assAfternoon = new CodeBinaryOperatorExpression(new CodePrimitiveExpression("下午好:"), CodeBinaryOperatorType.Add, new CodeArgumentReferenceExpression("name")); 
            var codecondition = new CodeConditionStatement(new CodeBinaryOperatorExpression( 
                nowExpression, CodeBinaryOperatorType.LessThanOrEqual, new CodePrimitiveExpression(10)), 
                new CodeStatement[] { new CodeExpressionStatement(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression(typeof(Console)), "WriteLine", assmon)) },           //true:if(DateTime.Now<=10) 
                //else 
                new CodeStatement[] 
                { 
                   new CodeConditionStatement(new CodeBinaryOperatorExpression(nowExpression, CodeBinaryOperatorType.LessThanOrEqual,new CodePrimitiveExpression(14) ),  // else if(DateTime.Now<=14) 
                     new CodeStatement[] { new CodeExpressionStatement(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression(typeof(Console)), "WriteLine",asslunch))},    //true 
                     new CodeStatement[] { new CodeExpressionStatement(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression(typeof(Console)), "WriteLine",assAfternoon))}) //fasle 
                } 
               );

testMeth.Statements.AddRange(new CodeStatement[] {             
            codecondition 
            });

var ns = new CodeNamespace("Wolf"); 
            ns.Imports.Add(new CodeNamespaceImport("System")); 
            ns.Types.Add(testClass); 
            var util = new CodeCompileUnit(); 
            util.Namespaces.Add(ns); 
            return util; 
        }

public string Genertor(string language) 
        { 
            StringBuilder sb = new StringBuilder(); 
            StringWriter sw = new StringWriter(sb); 
            System.CodeDom.Compiler.CodeDomProvider.CreateProvider(language).GenerateCodeFromCompileUnit( 
                this.CrateCodeCompileUnit(), sw, new System.CodeDom.Compiler.CodeGeneratorOptions() 
                { 
                    ElseOnClosing = true, 
                    IndentString = "    " 
                }); 
            sw.Close(); 
            return sb.ToString();

} 
    } 
}

<#@ template language="C#" #>

using System; 
namespace WolfT4 {   
    public class Test {

public void SayHello(string name) { 
            <# if(System.DateTime.Now.Hour<=10){#> 
            System.Console.WriteLine(("早上好:" + name)); 
            <#} else if(System.DateTime.Now.Hour<=14){#> 
            System.Console.WriteLine(("中午好:" + name)); 
            <#} else{ #> 
            System.Console.WriteLine(("下午好:" + name)); 
            <#}#>            
        } 
    } 
}