XML与DataSet的相互转换的类

1. using System;  
2. using System.Collections.Generic;  
3. using System.Text;  
4. using System.Data;  
5. using System.IO;  
6. using System.Xml;  
7.   
8. namespace XmlDesign  
9. {  
10.     class XmlDatasetConvert  
11.     {  
12.         //将xml对象内容字符串转换为DataSet  
13.         public static DataSet ConvertXMLToDataSet(string xmlData)  
14.         {  
15.             StringReader stream = null;  
16.             XmlTextReader reader = null;  
17.             try  
18.             {  
19.                 DataSet xmlDS = new DataSet();  
20.                 stream = new StringReader(xmlData);  
21.                 //从stream装载到XmlTextReader  
22.                 reader = new XmlTextReader(stream);  
23.                 xmlDS.ReadXml(reader);  
24.                 return xmlDS;  
25.             }  
26.             catch (System.Exception ex)  
27.             {  
28.                 throw ex;  
29.             }  
30.             finally  
31.             {  
32.                 if (reader != null) reader.Close();  
33.             }  
34.         }  
35.   
36.         //将xml文件转换为DataSet  
37.         public static DataSet ConvertXMLFileToDataSet(string xmlFile)  
38.         {  
39.             StringReader stream = null;  
40.             XmlTextReader reader = null;  
41.             try  
42.             {  
43.                 XmlDocument xmld = new XmlDocument();  
44.                 xmld.Load(xmlFile);  
45.   
46.                 DataSet xmlDS = new DataSet();  
47.                 stream = new StringReader(xmld.InnerXml);  
48.                 //从stream装载到XmlTextReader  
49.                 reader = new XmlTextReader(stream);  
50.                 xmlDS.ReadXml(reader);  
51.                 //xmlDS.ReadXml(xmlFile);  
52.                 return xmlDS;  
53.             }  
54.             catch (System.Exception ex)  
55.             {  
56.                 throw ex;  
57.             }  
58.             finally  
59.             {  
60.                 if (reader != null) reader.Close();  
61.             }  
62.         }  
63.   
64.         //将DataSet转换为xml对象字符串  
65.         public static string ConvertDataSetToXML(DataSet xmlDS)  
66.         {  
67.             MemoryStream stream = null;  
68.             XmlTextWriter writer = null;  
69.   
70.             try  
71.             {  
72.                 stream = new MemoryStream();  
73.                 //从stream装载到XmlTextReader  
74.                 writer = new XmlTextWriter(stream, Encoding.Unicode);  
75.   
76.                 //用WriteXml方法写入文件.  
77.                 xmlDS.WriteXml(writer);  
78.                 int count = (int)stream.Length;  
79.                 byte[] arr = new byte[count];  
80.                 stream.Seek(0, SeekOrigin.Begin);  
81.                 stream.Read(arr, 0, count);  
82.   
83.                 UnicodeEncoding utf = new UnicodeEncoding();  
84.                 return utf.GetString(arr).Trim();  
85.             }  
86.             catch (System.Exception ex)  
87.             {  
88.                 throw ex;  
89.             }  
90.             finally  
91.             {  
92.                 if (writer != null) writer.Close();  
93.             }  
94.         }  
95.   
96.         //将DataSet转换为xml文件  
97.         public static void ConvertDataSetToXMLFile(DataSet xmlDS,string xmlFile)  
98.         {  
99.             MemoryStream stream = null;  
100.             XmlTextWriter writer = null;  
101.   
102.             try  
103.             {  
104.                 stream = new MemoryStream();  
105.                 //从stream装载到XmlTextReader  
106.                 writer = new XmlTextWriter(stream, Encoding.Unicode);  
107.   
108.                 //用WriteXml方法写入文件.  
109.                 xmlDS.WriteXml(writer);  
110.                 int count = (int)stream.Length;  
111.                 byte[] arr = new byte[count];  
112.                 stream.Seek(0, SeekOrigin.Begin);  
113.                 stream.Read(arr, 0, count);  
114.   
115.                 //返回Unicode编码的文本  
116.                 UnicodeEncoding utf = new UnicodeEncoding();  
117.                 StreamWriter sw = new StreamWriter(xmlFile);  
118.                 sw.WriteLine("<?xml version=\\"1.0\\" encoding=\\"utf-8\\"?>");  
119.                 sw.WriteLine(utf.GetString(arr).Trim());  
120.                 sw.Close();  
121.             }  
122.             catch( System.Exception ex )  
123.             {  
124.                 throw ex;  
125.             }  
126.             finally  
127.             {  
128.                 if (writer != null) writer.Close();  
129.             }  
130.         }  
131.   
132.     }  
133. }