操作XML文件的又一个方便的方法！

首先使用Vs.net 2003 Tools菜单中的connect to DataBase 命令连接到数据库（以本地数据库为例），然后你可以看到本地数据库中的相应的表结构，这里我建立一个users表。然后再建立一个Dataset实体，如图所示：



然后从Server Explorer 中拖拽users对象到Dataset视图中去，这时能看到视图中有一个users表的结构，然后点击保存。这时默认是自动生成Dataset的代理类。你可以把隐藏的文件都显示出来，然后看Dataset的cs文件，这个就是他的代理类。代码如下：

dataset代理类
  1//------------------------------------------------------------------------------
  2// <autogenerated>
  3//     This code was generated by a tool.
  4//     Runtime Version: 1.1.4322.2300
  5//
  6//     Changes to this file may cause incorrect behavior and will be lost if 
  7//     the code is regenerated.
  8// </autogenerated>
  9//------------------------------------------------------------------------------
 10
 11namespace TestXsd {
 12    using System;
 13    using System.Data;
 14    using System.Xml;
 15    using System.Runtime.Serialization;
 16    
 17    
 18    [Serializable()]
 19    [System.ComponentModel.DesignerCategoryAttribute("code")]
 20    [System.Diagnostics.DebuggerStepThrough()]
 21    [System.ComponentModel.ToolboxItem(true)]
 22    public class Dataset2 : DataSet {
 23        
 24        private usersDataTable tableusers;
 25        
 26        public Dataset2() {
 27            this.InitClass();
 28            System.ComponentModel.CollectionChangeEventHandler schemaChangedHandler = new System.ComponentModel.CollectionChangeEventHandler(this.SchemaChanged);
 29            this.Tables.CollectionChanged += schemaChangedHandler;
 30            this.Relations.CollectionChanged += schemaChangedHandler;
 31        }
 32        
 33        protected Dataset2(SerializationInfo info, StreamingContext context) {
 34            string strSchema = ((string)(info.GetValue("XmlSchema", typeof(string))));
 35            if ((strSchema != null)) {
 36                DataSet ds = new DataSet();
 37                ds.ReadXmlSchema(new XmlTextReader(new System.IO.StringReader(strSchema)));
 38                if ((ds.Tables["users"] != null)) {
 39                    this.Tables.Add(new usersDataTable(ds.Tables["users"]));
 40                }
 41                this.DataSetName = ds.DataSetName;
 42                this.Prefix = ds.Prefix;
 43                this.Namespace = ds.Namespace;
 44                this.Locale = ds.Locale;
 45                this.CaseSensitive = ds.CaseSensitive;
 46                this.EnforceConstraints = ds.EnforceConstraints;
 47                this.Merge(ds, false, System.Data.MissingSchemaAction.Add);
 48                this.InitVars();
 49            }
 50            else {
 51                this.InitClass();
 52            }
 53            this.GetSerializationData(info, context);
 54            System.ComponentModel.CollectionChangeEventHandler schemaChangedHandler = new System.ComponentModel.CollectionChangeEventHandler(this.SchemaChanged);
 55            this.Tables.CollectionChanged += schemaChangedHandler;
 56            this.Relations.CollectionChanged += schemaChangedHandler;
 57        }
 58        
 59        [System.ComponentModel.Browsable(false)]
 60        [System.ComponentModel.DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Content)]
 61        public usersDataTable users {
 62            get {
 63                return this.tableusers;
 64            }
 65        }
 66        
 67        public override DataSet Clone() {
 68            Dataset2 cln = ((Dataset2)(base.Clone()));
 69            cln.InitVars();
 70            return cln;
 71        }
 72        
 73        protected override bool ShouldSerializeTables() {
 74            return false;
 75        }
 76        
 77        protected override bool ShouldSerializeRelations() {
 78            return false;
 79        }
 80        
 81        protected override void ReadXmlSerializable(XmlReader reader) {
 82            this.Reset();
 83            DataSet ds = new DataSet();
 84            ds.ReadXml(reader);
 85            if ((ds.Tables["users"] != null)) {
 86                this.Tables.Add(new usersDataTable(ds.Tables["users"]));
 87            }
 88            this.DataSetName = ds.DataSetName;
 89            this.Prefix = ds.Prefix;
 90            this.Namespace = ds.Namespace;
 91            this.Locale = ds.Locale;
 92            this.CaseSensitive = ds.CaseSensitive;
 93            this.EnforceConstraints = ds.EnforceConstraints;
 94            this.Merge(ds, false, System.Data.MissingSchemaAction.Add);
 95            this.InitVars();
 96        }
 97        
 98        protected override System.Xml.Schema.XmlSchema GetSchemaSerializable() {
 99            System.IO.MemoryStream stream = new System.IO.MemoryStream();
100            this.WriteXmlSchema(new XmlTextWriter(stream, null));
101            stream.Position = 0;
102            return System.Xml.Schema.XmlSchema.Read(new XmlTextReader(stream), null);
103        }
104        
105        internal void InitVars() {
106            this.tableusers = ((usersDataTable)(this.Tables["users"]));
107            if ((this.tableusers != null)) {
108                this.tableusers.InitVars();
109            }
110        }
111        
112        private void InitClass() {
113            this.DataSetName = "Dataset2";
114            this.Prefix = "";
115            this.Namespace = "http://tempuri.org/Dataset2.xsd";
116            this.Locale = new System.Globalization.CultureInfo("en-US");
117            this.CaseSensitive = false;
118            this.EnforceConstraints = true;
119            this.tableusers = new usersDataTable();
120            this.Tables.Add(this.tableusers);
121        }
122        
123        private bool ShouldSerializeusers() {
124            return false;
125        }
126        
127        private void SchemaChanged(object sender, System.ComponentModel.CollectionChangeEventArgs e) {
128            if ((e.Action == System.ComponentModel.CollectionChangeAction.Remove)) {
129                this.InitVars();
130            }
131        }
132        
133        public delegate void usersRowChangeEventHandler(object sender, usersRowChangeEvent e);
134        
135        [System.Diagnostics.DebuggerStepThrough()]
136        public class usersDataTable : DataTable, System.Collections.IEnumerable {
137            
138            private DataColumn columnUserID;
139            
140            private DataColumn columnUsername;
141            
142            private DataColumn columnPassword;
143            
144            private DataColumn columnNickname;
145            
146            private DataColumn columnEmail;
147            
148            private DataColumn columnLastLoginTime;
149            
150            private DataColumn columnGroupID;
151            
152            private DataColumn columnPoint;
153            
154            internal usersDataTable() : 
155                    base("users") {
156                this.InitClass();
157            }
158            
159            internal usersDataTable(DataTable table) : 
160                    base(table.TableName) {
161                if ((table.CaseSensitive != table.DataSet.CaseSensitive)) {
162                    this.CaseSensitive = table.CaseSensitive;
163                }
164                if ((table.Locale.ToString() != table.DataSet.Locale.ToString())) {
165                    this.Locale = table.Locale;
166                }
167                if ((table.Namespace != table.DataSet.Namespace)) {
168                    this.Namespace = table.Namespace;
169                }
170                this.Prefix = table.Prefix;
171                this.MinimumCapacity = table.MinimumCapacity;
172                this.DisplayExpression = table.DisplayExpression;
173            }
174            
175            [System.ComponentModel.Browsable(false)]
176            public int Count {
177                get {
178                    return this.Rows.Count;
179                }
180            }
181            
182            internal DataColumn UserIDColumn {
183                get {
184                    return this.columnUserID;
185                }
186            }
187            
188            internal DataColumn UsernameColumn {
189                get {
190                    return this.columnUsername;
191                }
192            }
193            
194            internal DataColumn PasswordColumn {
195                get {
196                    return this.columnPassword;
197                }
198            }
199            
200            internal DataColumn NicknameColumn {
201                get {
202                    return this.columnNickname;
203                }
204            }
205            
206            internal DataColumn EmailColumn {
207                get {
208                    return this.columnEmail;
209                }
210            }
211            
212            internal DataColumn LastLoginTimeColumn {
213                get {
214                    return this.columnLastLoginTime;
215                }
216            }
217            
218            internal DataColumn GroupIDColumn {
219                get {
220                    return this.columnGroupID;
221                }
222            }
223            
224            internal DataColumn PointColumn {
225                get {
226                    return this.columnPoint;
227                }
228            }
229            
230            public usersRow this[int index] {
231                get {
232                    return ((usersRow)(this.Rows[index]));
233                }
234            }
235            
236            public event usersRowChangeEventHandler usersRowChanged;
237            
238            public event usersRowChangeEventHandler usersRowChanging;
239            
240            public event usersRowChangeEventHandler usersRowDeleted;
241            
242            public event usersRowChangeEventHandler usersRowDeleting;
243            
244            public void AddusersRow(usersRow row) {
245                this.Rows.Add(row);
246            }
247            
248            public usersRow AddusersRow(string Username, string Password, string Nickname, string Email, System.DateTime LastLoginTime, short GroupID, int Point) {
249                usersRow rowusersRow = ((usersRow)(this.NewRow()));
250                rowusersRow.ItemArray = new object[] {
251                        null,
252                        Username,
253                        Password,
254                        Nickname,
255                        Email,
256                        LastLoginTime,
257                        GroupID,
258                        Point};
259                this.Rows.Add(rowusersRow);
260                return rowusersRow;
261            }
262            
263            public usersRow FindByUserID(int UserID) {
264                return ((usersRow)(this.Rows.Find(new object[] {
265                            UserID})));
266            }
267            
268            public System.Collections.IEnumerator GetEnumerator() {
269                return this.Rows.GetEnumerator();
270            }
271            
272            public override DataTable Clone() {
273                usersDataTable cln = ((usersDataTable)(base.Clone()));
274                cln.InitVars();
275                return cln;
276            }
277            
278            protected override DataTable CreateInstance() {
279                return new usersDataTable();
280            }
281            
282            internal void InitVars() {
283                this.columnUserID = this.Columns["UserID"];
284                this.columnUsername = this.Columns["Username"];
285                this.columnPassword = this.Columns["Password"];
286                this.columnNickname = this.Columns["Nickname"];
287                this.columnEmail = this.Columns["Email"];
288                this.columnLastLoginTime = this.Columns["LastLoginTime"];
289                this.columnGroupID = this.Columns["GroupID"];
290                this.columnPoint = this.Columns["Point"];
291            }
292            
293            private void InitClass() {
294                this.columnUserID = new DataColumn("UserID", typeof(int), null, System.Data.MappingType.Element);
295                this.Columns.Add(this.columnUserID);
296                this.columnUsername = new DataColumn("Username", typeof(string), null, System.Data.MappingType.Element);
297                this.Columns.Add(this.columnUsername);
298                this.columnPassword = new DataColumn("Password", typeof(string), null, System.Data.MappingType.Element);
299                this.Columns.Add(this.columnPassword);
300                this.columnNickname = new DataColumn("Nickname", typeof(string), null, System.Data.MappingType.Element);
301                this.Columns.Add(this.columnNickname);
302                this.columnEmail = new DataColumn("Email", typeof(string), null, System.Data.MappingType.Element);
303                this.Columns.Add(this.columnEmail);
304                this.columnLastLoginTime = new DataColumn("LastLoginTime", typeof(System.DateTime), null, System.Data.MappingType.Element);
305                this.Columns.Add(this.columnLastLoginTime);
306                this.columnGroupID = new DataColumn("GroupID", typeof(short), null, System.Data.MappingType.Element);
307                this.Columns.Add(this.columnGroupID);
308                this.columnPoint = new DataColumn("Point", typeof(int), null, System.Data.MappingType.Element);
309                this.Columns.Add(this.columnPoint);
310                this.Constraints.Add(new UniqueConstraint("Dataset2Key1", new DataColumn[] {
311                                this.columnUserID}, true));
312                this.columnUserID.AutoIncrement = true;
313                this.columnUserID.AllowDBNull = false;
314                this.columnUserID.ReadOnly = true;
315                this.columnUserID.Unique = true;
316                this.columnLastLoginTime.AllowDBNull = false;
317                this.columnGroupID.AllowDBNull = false;
318                this.columnPoint.AllowDBNull = false;
319            }
320            
321            public usersRow NewusersRow() {
322                return ((usersRow)(this.NewRow()));
323            }
324            
325            protected override DataRow NewRowFromBuilder(DataRowBuilder builder) {
326                return new usersRow(builder);
327            }
328            
329            protected override System.Type GetRowType() {
330                return typeof(usersRow);
331            }
332            
333            protected override void OnRowChanged(DataRowChangeEventArgs e) {
334                base.OnRowChanged(e);
335                if ((this.usersRowChanged != null)) {
336                    this.usersRowChanged(this, new usersRowChangeEvent(((usersRow)(e.Row)), e.Action));
337                }
338            }
339            
340            protected override void OnRowChanging(DataRowChangeEventArgs e) {
341                base.OnRowChanging(e);
342                if ((this.usersRowChanging != null)) {
343                    this.usersRowChanging(this, new usersRowChangeEvent(((usersRow)(e.Row)), e.Action));
344                }
345            }
346            
347            protected override void OnRowDeleted(DataRowChangeEventArgs e) {
348                base.OnRowDeleted(e);
349                if ((this.usersRowDeleted != null)) {
350                    this.usersRowDeleted(this, new usersRowChangeEvent(((usersRow)(e.Row)), e.Action));
351                }
352            }
353            
354            protected override void OnRowDeleting(DataRowChangeEventArgs e) {
355                base.OnRowDeleting(e);
356                if ((this.usersRowDeleting != null)) {
357                    this.usersRowDeleting(this, new usersRowChangeEvent(((usersRow)(e.Row)), e.Action));
358                }
359            }
360            
361            public void RemoveusersRow(usersRow row) {
362                this.Rows.Remove(row);
363            }
364        }
365        
366        [System.Diagnostics.DebuggerStepThrough()]
367        public class usersRow : DataRow {
368            
369            private usersDataTable tableusers;
370            
371            internal usersRow(DataRowBuilder rb) : 
372                    base(rb) {
373                this.tableusers = ((usersDataTable)(this.Table));
374            }
375            
376            public int UserID {
377                get {
378                    return ((int)(this[this.tableusers.UserIDColumn]));
379                }
380                set {
381                    this[this.tableusers.UserIDColumn] = value;
382                }
383            }
384            
385            public string Username {
386                get {
387                    try {
388                        return ((string)(this[this.tableusers.UsernameColumn]));
389                    }
390                    catch (InvalidCastException e) {
391                        throw new StrongTypingException("Cannot get value because it is DBNull.", e);
392                    }
393                }
394                set {
395                    this[this.tableusers.UsernameColumn] = value;
396                }
397            }
398            
399            public string Password {
400                get {
401                    try {
402                        return ((string)(this[this.tableusers.PasswordColumn]));
403                    }
404                    catch (InvalidCastException e) {
405                        throw new StrongTypingException("Cannot get value because it is DBNull.", e);
406                    }
407                }
408                set {
409                    this[this.tableusers.PasswordColumn] = value;
410                }
411            }
412            
413            public string Nickname {
414                get {
415                    try {
416                        return ((string)(this[this.tableusers.NicknameColumn]));
417                    }
418                    catch (InvalidCastException e) {
419                        throw new StrongTypingException("Cannot get value because it is DBNull.", e);
420                    }
421                }
422                set {
423                    this[this.tableusers.NicknameColumn] = value;
424                }
425            }
426            
427            public string Email {
428                get {
429                    try {
430                        return ((string)(this[this.tableusers.EmailColumn]));
431                    }
432                    catch (InvalidCastException e) {
433                        throw new StrongTypingException("Cannot get value because it is DBNull.", e);
434                    }
435                }
436                set {
437                    this[this.tableusers.EmailColumn] = value;
438                }
439            }
440            
441            public System.DateTime LastLoginTime {
442                get {
443                    return ((System.DateTime)(this[this.tableusers.LastLoginTimeColumn]));
444                }
445                set {
446                    this[this.tableusers.LastLoginTimeColumn] = value;
447                }
448            }
449            
450            public short GroupID {
451                get {
452                    return ((short)(this[this.tableusers.GroupIDColumn]));
453                }
454                set {
455                    this[this.tableusers.GroupIDColumn] = value;
456                }
457            }
458            
459            public int Point {
460                get {
461                    return ((int)(this[this.tableusers.PointColumn]));
462                }
463                set {
464                    this[this.tableusers.PointColumn] = value;
465                }
466            }
467            
468            public bool IsUsernameNull() {
469                return this.IsNull(this.tableusers.UsernameColumn);
470            }
471            
472            public void SetUsernameNull() {
473                this[this.tableusers.UsernameColumn] = System.Convert.DBNull;
474            }
475            
476            public bool IsPasswordNull() {
477                return this.IsNull(this.tableusers.PasswordColumn);
478            }
479            
480            public void SetPasswordNull() {
481                this[this.tableusers.PasswordColumn] = System.Convert.DBNull;
482            }
483            
484            public bool IsNicknameNull() {
485                return this.IsNull(this.tableusers.NicknameColumn);
486            }
487            
488            public void SetNicknameNull() {
489                this[this.tableusers.NicknameColumn] = System.Convert.DBNull;
490            }
491            
492            public bool IsEmailNull() {
493                return this.IsNull(this.tableusers.EmailColumn);
494            }
495            
496            public void SetEmailNull() {
497                this[this.tableusers.EmailColumn] = System.Convert.DBNull;
498            }
499        }
500        
501        [System.Diagnostics.DebuggerStepThrough()]
502        public class usersRowChangeEvent : EventArgs {
503            
504            private usersRow eventRow;
505            
506            private DataRowAction eventAction;
507            
508            public usersRowChangeEvent(usersRow row, DataRowAction action) {
509                this.eventRow = row;
510                this.eventAction = action;
511            }
512            
513            public usersRow Row {
514                get {
515                    return this.eventRow;
516                }
517            }
518            
519            public DataRowAction Action {
520                get {
521                    return this.eventAction;
522                }
523            }
524        }
525    }
526}
527

你可以用代理类提供的方法方便的对xml文件进行操作，代码如下：

 1            Dataset2 ds = new Dataset2() ;
 2            ds.ReadXml("test.xml") ;
 3             
 4            Dataset2.usersRow row = ds.users.NewusersRow() ;
 5            row.Username="test";
 6            row.Email ="test@test.com";
 7            row.Password ="test";
 8            row.Nickname ="test";
 9            row.LastLoginTime =DateTime.Now ;
10            row.GroupID =1;
11            row.Point =100;
12            ds.users.AddusersRow(row)  ;
13
14            ds.WriteXml("test.xml") ;

这种方法非常方便，使用拖拽的方式生成xml schemal  ，当然事先你也可以自己定义好schemal后 ，再生成代理类，偶是个懒人觉得这种方式比较适合我！如果你有什么好的想法都可以回复到下面！