用C#写的转换程序（将高版本项目转变成低版本）

源码：

//可以在这个链接中下载 http://pan.baidu.com/s/1qWFN4CW //将在窗体中放一个按钮（btnOpen)一个按钮（btnConvert), 一个文本框(txtFolder)， 一个打开文件夹的对话框（在工具箱上找到“对话框”）
//本程序的作用是：将项目转成低版本的程序
//主要是考虑到有的同学用的Visual Studio的低版本（如2010），不能打开VisualStudio2013的版本不方便
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace SolutionVersionConverter
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void btnOpen_Click(object sender, EventArgs e)
{
if (this.folderBrowserDialog1.ShowDialog() == DialogResult.OK)
this.txtFolder.Text = this.folderBrowserDialog1.SelectedPath;
}

private void btnConvert_Click(object sender, EventArgs e)
{
ConvertInPath(new DirectoryInfo(this.txtFolder.Text.Trim()));
MessageBox.Show("ok!");
}

void ConvertInPath(DirectoryInfo path)
{
if(! path.Exists) return;

foreach (FileInfo file in path.GetFiles())
{
string filepath = file.FullName;
if (filepath.ToLower().EndsWith(".sln"))
ConvertSln(filepath);
else if (filepath.ToLower().EndsWith(".csproj"))
ConvertPrj(filepath);
else if (filepath.ToLower().EndsWith(".config"))
ConvertCfg(filepath);
}

foreach( DirectoryInfo subpath in path.GetDirectories() )
{
ConvertInPath(subpath);
}
}
void ConvertSln(string path)
{
StreamReader sr = new StreamReader(path, Encoding.UTF8);
string content = sr.ReadToEnd();
sr.Close();
if (content.IndexOf("Microsoft Visual Studio Solution File, Format Version 12.00")>=0)
{
content = content.Replace("Microsoft Visual Studio Solution File, Format Version 12.00",
"Microsoft Visual Studio Solution File, Format Version 11.00");
content = content.Replace("# Visual Studio 2013",
"# Visual Studio 2010");
content = content.Replace("# Visual Studio 2012",
"# Visual Studio 2010");
content = content.Replace("# Visual Studio Express 2013 for Windows Desktop",
"# Visual Studio 2010");
content = content.Replace("# Visual Studio Express 2012 for Windows Desktop",
"# Visual Studio 2010");
StreamWriter sw = new StreamWriter(path,false, Encoding.UTF8);
sw.Write(content);
sw.Close();
}
}
void ConvertPrj(string path)
{
StreamReader sr = new StreamReader(path, Encoding.UTF8);
string content = sr.ReadToEnd();
sr.Close();
if (content.IndexOf("<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>")>=0)
{
content = content.Replace("<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>",
"<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>");
content = content.Replace("<ProjectGuid>",
"<ProductVersion>8.0.30703</ProductVersion><ProjectGuid>");
content = content.Replace("<SignManifests>true</SignManifests>",
"<SignManifests>false</SignManifests>");

StreamWriter sw = new StreamWriter(path, false, Encoding.UTF8);
sw.Write(content);
sw.Close();
}
}
void ConvertCfg(string path)
{
StreamReader sr = new StreamReader(path, Encoding.UTF8);
string content = sr.ReadToEnd();
sr.Close();
if (content.IndexOf("<supportedRuntime version=\"v4.0\" sku=\".NETFramework,Version=v4.5\" />")>=0)
{
content = content.Replace("<supportedRuntime version=\"v4.0\" sku=\".NETFramework,Version=v4.5\" />",
"<supportedRuntime version=\"v4.0\" sku=\".NETFramework,Version=v4.0\" />");

StreamWriter sw = new StreamWriter(path, false, Encoding.UTF8);
sw.Write(content);
sw.Close();
}
}
}
}

运行效果如下：