C# 调用控制台程序，并获取输出写入文件

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;
 using System.Diagnostics;

 namespace CSharpIOTest
 {
     class Program
     {
         static void Main(string[] args)
         {
             string file = @"I:\computer_info.cfg";
             if (File.Exists(file))
             {
                 DisplayVersion();

                 FileStream fs = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Write);
                 StreamWriter sw = new StreamWriter(fs);
                 sw.Write(RunCmd("systeminfo"));
                 sw.Flush();
                 sw.Close();
                 System.Console.WriteLine("Write data successfully.\r\n");

                 FileParse f = new FileParse(file);
                 System.Console.WriteLine(f.FileContent);
                 System.Console.WriteLine("read data successfully.\r\n");
             }
         }

         private static string RunCmd(string cmd)
         {
             Process p = new Process();
             p.StartInfo.FileName = "cmd.exe";
             p.StartInfo.Arguments = "/c" + cmd;
             p.StartInfo.UseShellExecute = false;
             p.StartInfo.RedirectStandardError = true;
             p.StartInfo.RedirectStandardInput = true;
             p.StartInfo.RedirectStandardOutput = true;
             p.StartInfo.CreateNoWindow = true;

             p.Start();
             p.StandardInput.WriteLine("exit");

             return p.StandardOutput.ReadToEnd();
         }

         private static void DisplayVersion()
         {
             System.Console.ForegroundColor = ConsoleColor.Red;
             System.Console.WriteLine("Cosmos Copyright 2010 Project");
             System.Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
             System.Console.ForegroundColor = ConsoleColor.White;
             System.Console.Write("test ");
             System.Console.ForegroundColor = ConsoleColor.Green;
             System.Console.WriteLine("2013.10.19");
             System.Console.ForegroundColor = ConsoleColor.White;
             System.Console.WriteLine();
         }
     }
 }

FileParse.cs：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;

 namespace CSharpIOTest
 {
     class FileParse
     {
         private string filePath;//文件路径
         private string fileName;//文件名
         private string fileContent;//文件内容

         public FileParse()
         {
             filePath = string.Empty;
             fileName = string.Empty;
             fileContent = string.Empty;
         }

         public FileParse(string file)
         {
             filePath = file;
         }

         public string FilePath
         {
             set { filePath = value; }
             get { return filePath; }
         }

         public string FileName
         {
             set { fileName = value; }
             get { return fileName; }
         }

         public string FileContent
         {
             set { fileContent = value; }
             get
             {
                 if (File.Exists(filePath))
                 {
                     FileStream fs = new FileStream(filePath,FileMode.Open,FileAccess.Read);
                     StreamReader sr = new StreamReader(fs);
                     return sr.ReadToEnd();
                 }
                 else
                 {
                     System.Console.WriteLine("file is empty.\r\n");
                     return string.Empty;
                 }
             }
         }
     }
 }