plist文件数据2倍

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{

private void Form1_Load(object sender, EventArgs e)
{

}

public Form1()
{
InitializeComponent();
//FileStream readStream = new FileStream("f:/Object/icon.plist", FileMode.Open);
FileStream aFile = new FileStream("f:/Objects9/icon.plist", FileMode.Open);
StreamReader sr = new StreamReader(aFile);
string str = sr.ReadToEnd();
sr.Close();

string str2 = "";
string temp = "";
for(int i=0;i< str.Length; ++i)
{
if(str[i]=='{' || str[i] == '}' || str[i] == ',')
{
try
{
int value = int.Parse(temp);
str2 += value*2;
}
catch (Exception ex)
{
str2 += temp;
}
temp = "";
str2 += str[i];
}
else
{
temp += str[i];
}
}
str2 += temp;

aFile = new FileStream("f:/Objects9/icon.plistex", FileMode.OpenOrCreate);
StreamWriter sw = new StreamWriter(aFile);
sw.WriteLine(str2);
sw.Close();
}
}
}