1 public partial class TextFile
 2 {
 3     /// <summary>
 4     /// 读取文本文件
 5     /// </summary>
 6     /// <param name="filePath">被读取文件的路径</param>
 7     /// <returns></returns>
 8     public static string Read(string filePath)
 9     {
10         try
11         {
12             if (!File.Exists(filePath))
13             {
14                 return string.Empty;
15             }
16 
17             return File.ReadAllText(filePath);
18         }
19         catch (Exception ex)
20         {
21             throw ex;
22         }
23     }
24 }

 1 public partial class TextFile
 2 {
 3     /// <summary>
 4     /// 写入文本文件
 5     /// </summary>
 6     /// <param name="filePath">文件路径，包括文件名</param>
 7     /// <param name="contact">需要写入的内容</param>
 8     public static void Write(string filePath,string contact)
 9     {
10         try
11         {
12             if (string.IsNullOrWhiteSpace(filePath))
13             {
14                 throw new Exception("filePath is empty");
15             }
16 
17             string fileDirectory = Path.GetDirectoryName(filePath);
18             if (!Directory.Exists(fileDirectory))
19             {
20                 Directory.CreateDirectory(fileDirectory);
21             }
22 
23             FileStream fs = new FileStream(filePath, FileMode.Create);
24             StreamWriter sw = new StreamWriter(fs);
25             sw.Write((File.Exists(filePath) ? "\n" : "") + contact);
26             sw.Flush();
27             sw.Close();
28             fs.Close();
29         }
30         catch (Exception ex)
31         {
32             throw;
33         }
34     }        
35 }