GridView实战一：自定义分页、排序、修改、插入、删除

​前言：​

　　在某次公司面试时被问到对GridView操作的熟悉程度，在那之前一直用Repeater内嵌table标签对GridView操作确实很少，于是最近在项目的后台上对GridView进行了一番实操，本文和后面的另一篇GridView实战二：使用ObjectDataSource数据源控件均是这段时间的一些总结。

　　GridView优点就是集数据绑定、分页、排序、删、改于一身，提高了开发效率；缺点嘛，就是运行效率低，并且它本身不带添加功能。于是GridView用于后台开发是一个不错的选择，而前台页面还是少用为妙咯。

​实战一：​

​　　​1.本次实战效果图如下：

图一.展示状态

图二.编辑状态

图三.添加记录状态

2.具体代码

.aspx页面

1         <asp:GridView runat="server" ID="gv" AutoGenerateColumns="false"

2              AllowPaging="true" PageSize="1" AllowSorting="true" DataKeyNames="ID"

3              OnRowDataBound="gv_OnRowDataBound" OnRowDeleting="gv_OnRowDeleting"

4              OnRowEditing="gv_OnRowEditing" OnRowCancelingEdit="gv_OnRowCancelingEdit"

5              OnRowUpdating="gv_OnRowUpdating" OnSorting="gv_OnSorting">

6              <HeaderStyle BackColor="graytext" />

7             <Columns>

8                 <asp:TemplateField>

9                     <HeaderStyle Width="20%" />

10                     <HeaderTemplate>

11                         <asp:LinkButton runat="server" ID="lbtnSortName" Text="Name" CommandName="Sort" CommandArgument="Name">

12                         </asp:LinkButton>

13                     </HeaderTemplate>

14                     <ItemTemplate><%#Eval("Name") %></ItemTemplate>

15                     <EditItemTemplate>

16                         <asp:TextBox runat="server" ID="tbxName" Text='<%#Eval("Name") %>'></asp:TextBox>

17                         <asp:RegularExpressionValidator runat="server" ID="revName" ControlToValidate="tbxName"

18                              ValidationExpression="[a-zA-Z]+" ErrorMessage="Please input your English name!" Display="Dynamic">

19                         </asp:RegularExpressionValidator>

20                         <asp:RequiredFieldValidator runat="server" ID="rfvName" ControlToValidate="tbxName"

21                             ErrorMessage="Please input your name" Display="Dynamic">

22                         </asp:RequiredFieldValidator>

23                     </EditItemTemplate>

24                 </asp:TemplateField>

25                 <asp:TemplateField>

26                     <HeaderStyle Width="10%"/>

27                     <HeaderTemplate>

28                         <asp:LinkButton runat="server" ID="lbtnSortSex" Text="Sex" CommandName="Sort" CommandArgument="Sex">

29                         </asp:LinkButton>

30                     </HeaderTemplate>

31                     <ItemTemplate>

32                         <asp:RadioButtonList Enabled="false" runat="server" ID="rblSexShow" RepeatDirection="Horizontal"

33                             RepeatColumns="2">

34                         </asp:RadioButtonList>

35                     </ItemTemplate>

36                     <EditItemTemplate>

37                          <asp:RadioButtonList runat="server" ID="rblSexEdit" RepeatDirection="Horizontal" RepeatColumns="2">

38                          </asp:RadioButtonList>

39                     </EditItemTemplate>

40                 </asp:TemplateField>

41                 <asp:TemplateField>

42                     <HeaderStyle Width="20%"/>

43                     <HeaderTemplate>

44                         <asp:LinkButton runat="server" ID="lbtnSortCountry" Text="Country" CommandName="Sort" CommandArgument="Country">

45                         </asp:LinkButton>

46                     </HeaderTemplate>

47                     <ItemTemplate><%#Eval("Country")%></ItemTemplate>

48                     <EditItemTemplate>

49                         <asp:DropDownList runat="server" ID="ddlCountry"></asp:DropDownList>

50                     </EditItemTemplate>

51                 </asp:TemplateField>

52                 <asp:TemplateField>

53                     <HeaderStyle Width="20%"/>

54                     <HeaderTemplate>Hobby</HeaderTemplate>

55                     <ItemTemplate><%#Eval("Hobby") %></ItemTemplate>

56                     <EditItemTemplate>

57                         <asp:CheckBoxList runat="server" ID="cbxlHobby" RepeatDirection="Horizontal" RepeatColumns="5">

58                         </asp:CheckBoxList>

59                     </EditItemTemplate>

60                 </asp:TemplateField>

61                 <asp:TemplateField ItemStyle-HorizontalAlign="Center">

62                     <HeaderStyle Width="10%"/>

63                     <HeaderTemplate>

64                         <asp:LinkButton runat="server" ID="lbtnShowAdd" Text="Add" OnClick="lbtnShowAdd_OnClick">

65                         </asp:LinkButton>

66                     </HeaderTemplate>

67                     <ItemTemplate>

68                         <asp:LinkButton runat="server" ID="lbtnEdit" Text="Edit" CommandName="Edit" />&emsp;

69                         <asp:LinkButton runat="server" ID="lbtnDelete" Text="Delete" CommandName="Delete" />

70                     </ItemTemplate>

71                     <EditItemTemplate>

72                         <asp:LinkButton runat="server" ID="lbtnSubmit" Text="Update" CommandName="Update" />&emsp;

73                         <asp:LinkButton runat="server" ID="lbtnCancel" Text="Cancel" CommandName="Cancel" />

74                     </EditItemTemplate>

75                 </asp:TemplateField>

76             </Columns>

77             <PagerSettings Visible="true" />

78             <PagerStyle Font-Size="12px"/>

79             <PagerTemplate>

80                 <div style="float:left;margin-left:15px;color:#999;line-height:20px">

81                     当前第<%#this.gv.PageIndex+1 %>/<%#this.gv.PageCount %>页

82                 </div>

83                 <div style="float:right;margin-right:15px;color:#999;line-height:20px">页</div>

84                 <div style="float:right">

85                     <asp:DropDownList runat="server" ID="ddlPaging" AutoPostBack="true"

86                         OnSelectedIndexChanged="ddlPaging_OnSelectedIndexChanged">

87                     </asp:DropDownList>

88                 </div>

89                 <div style="float:right;color:#999;line-height:20px">跳转到第</div>

90             </PagerTemplate>

91             <EmptyDataTemplate>

92                 <div><b>Name:</b>

93                     <asp:TextBox runat="server" ID="tbxName"></asp:TextBox>

94                     <asp:RegularExpressionValidator runat="server" ID="revName" ControlToValidate="tbxName"

95                          ValidationExpression="^[a-zA-Z]+$" Display="Dynamic" ErrorMessage="Please input your English name!">

96                     </asp:RegularExpressionValidator>

97                    <asp:RequiredFieldValidator runat="server" ID="rfvName" ControlToValidate="tbxName"

98                         ErrorMessage="Please input your name" Display="Dynamic">

99                     </asp:RequiredFieldValidator>

100                 </div>

101                 <div><b>Sex:</b>

102                     <asp:RadioButtonList runat="server" id="rblSex" RepeatColumns="2" RepeatDirection="Horizontal">

103                         <asp:ListItem Value="M" Text="Male" Selected="True"></asp:ListItem>

104                         <asp:ListItem Value="F" Text="Female"></asp:ListItem>

105                     </asp:RadioButtonList>

106                 </div>

107                 <div><b>Country:</b>

108                     <asp:DropDownList runat="server" ID="ddlCountry">

109                     </asp:DropDownList>

110                     <asp:RequiredFieldValidator runat="server" ID="rfCountry" ControlToValidate="ddlCountry"

111                         ErrorMessage="Please Choose Country" Display="Dynamic">

112                     </asp:RequiredFieldValidator>

113                 </div>

114                 <div><b>Hobby:</b>

115                     <asp:CheckBoxList runat="server" ID="cbxlHobby" RepeatColumns="5" RepeatDirection="Horizontal">

116                     </asp:CheckBoxList>

117                 </div>

118                 <div>

119                     <asp:LinkButton runat="server" ID="lbtnSubmit" Text="Submit" OnClick="lbtnSubmit_OnClick" />

120                     <asp:LinkButton  runat="server" ID="lbtnCancel" Text="Cancel" OnClick="lbtnCancel_OnClick"

121                         CausesValidation="false"/>

122                 </div>

123             </EmptyDataTemplate>

124         </asp:GridView>

说明：

1.显示状态时：对于只显示文字串的用<%#Eval("字段名")%>直接绑定，而对于单选组（性别）的内容就放在GridView的OnRowDataBound来绑定。

2.编辑状态时：复选组、单选组合下拉列表都在OnRowDataBound来绑定；这里没有用数据源控件，所以用<%#Bind("字段名")%>和<%#Eval("字段名")%>没区别，<%#Bind("字段名")%>的双向通讯不起作用。

3.新增状态：因为GridView自身附带新增记录的功能，所以选择在EmptyDataTemplate中实现新增的功能（借鉴其他同行的做法！）；因为使用了验证控件，所以把取消按钮（操作不验证合法性）设为不触发验证。

4.分页功能：本例是将分页功能放置到gridview的PagerTemplate中实现。这里有两个注意点：

a.DropDownList设置AutoPostBack为true；

b.因为要触发DropDownList的OnSelectedIndexChanged事件，所以viewstate要启用。触发OnSelectedIndexChanged事件的条件是postback的selectedIndex和原始值不同，当viewstate启用时原始值就是viewstate中保存的值，当viewstate禁用时就是控件初始化时的selectedIndex或第一个选项。因此如果禁用了ViewState那么当选择回控件初始化时的选项时就不会触发OnSelectedIndexChanged事件了。

c.GridView的OnRowDataBound中每次postback都重新初始化DropDownList。因为DropDownList包含在GridView中是动态生成的，当PostBack时GridView并不会恢复其中的动态内容；如果把分页功能放在GridView以外实现，那么动态生成的时DropDownList的选项，就Postback时不用再初始化了。

d.因为DropDownList位于GridView里面，所以当把某个ListItem的enable设为false时，该选项就不生成（连Html代码都没了），如果放在GridView外只是显示为不可用而已，原因不明。为实现添加状态初始画面中存在默认不可选的listitem效果，用了html的disabled属性来设置。

.aspx.cs代码

1 public partial class _Default : System.Web.UI.Page

2 {

3     private DataManager dm = new DataManager();

4

5     protected void Page_Load(object sender, EventArgs e)

6     {

7         if (!IsPostBack)

8         {

9             this.gv.DataSource = dm.GetDt();

10             this.gv.DataBind();

11

12             //记录最近一次排序方向

13             ViewState["Direction"] = SortDirection.Descending;

14         }

15     }

16

17     protected void gv_OnRowDataBound(object sender, GridViewRowEventArgs e)

18     {

19         DataRowView drv = e.Row.DataItem as DataRowView;

20

21         if (e.Row.RowType == DataControlRowType.DataRow)

22         {

23             //显示时

24             if (this.gv.EditIndex == -1)

25             {

26                 //设置性别

27                 RadioButtonList rbl = e.Row.FindControl("rblSexShow") as RadioButtonList;

28                 rbl.Items.Add(new ListItem("Male", "M"));

29                 rbl.Items.Add(new ListItem("Female", "F"));

30                 if ((drv["Sex"] as string).ToLower().Equals("m"))

31                     rbl.Items[0].Selected = true;

32                 else

33                     rbl.Items[1].Selected = true;

34             }

35             //修改时：

36             else if(e.Row.RowIndex == this.gv.EditIndex)

37             {

38                 //性别

39                 RadioButtonList rbl = e.Row.FindControl("rblSexEdit") as RadioButtonList;

40                 rbl.Items.Add(new ListItem("Male", "M"));

41                 rbl.Items.Add(new ListItem("Female", "F"));

42                 if ((drv["Sex"] as string).ToLower().Equals("m"))

43                     rbl.Items[0].Selected = true;

44                 else

45                     rbl.Items[1].Selected = true;

46                 //国籍

47                 DropDownList ddlCountry = e.Row.FindControl("ddlCountry") as DropDownList;

48                 DataTable countryDt = dm.GetCountry();

49                 ListItem li = null;

50                 for(int i=0;i<countryDt.Rows.Count;++i)

51                 {

52                     string cn = countryDt.Rows[i]["cn"] as string;

53                     li = new ListItem(cn, cn);

54                     if (cn.Equals(drv["Country"] as string))

55                         li.Selected = true;

56                     ddlCountry.Items.Add(li);

57                 }

58                 //兴趣

59                 CheckBoxList cbl = e.Row.FindControl("cbxlHobby") as CheckBoxList;

60                 DataTable hobbyDt = dm.GetHobby();

61                 string hobbys = drv["Hobby"] as string;

62                 ListItem hobbyLi = null;

63                 string hstr = string.Empty;

64                 for (int i = 0; i < hobbyDt.Rows.Count; i++)

65                 {

66                     hstr = hobbyDt.Rows[i]["hobby"] as string;

67                     hobbyLi = new ListItem(hstr, hstr);

68                     if (hobbys.IndexOf(hstr)>=0)

69                         hobbyLi.Selected = true;

70                     cbl.Items.Add(hobbyLi);

71                 }

72             }

73         }

74         else if (e.Row.RowType == DataControlRowType.Pager)

75         {

76             //绑定分页控件

77             DropDownList ddlPaging = e.Row.FindControl("ddlPaging") as DropDownList;

78             for (int i = 0; i < this.gv.PageCount; i++)

79             {

80                 ddlPaging.Items.Add(new ListItem(Convert.ToString(i + 1), Convert.ToString(i)));

81             }

82             ddlPaging.SelectedIndex = this.gv.PageIndex;

83         }

84         else if (e.Row.RowType == DataControlRowType.EmptyDataRow)

85         {

86             //添加记录画面

87 //国籍

88             DropDownList ddlCountry = e.Row.FindControl("ddlCountry") as DropDownList;

89             DataTable countryDt = dm.GetCountry();

90             ListItem li =  new ListItem("Please Select","");

91             li.Attributes["disabled"] = "disabled";

92             li.Selected = true;

93             ddlCountry.Items.Add(li);

94             for (int i = 0; i < countryDt.Rows.Count; ++i)

95             {

96                 string cn = countryDt.Rows[i]["cn"] as string;

97                 li = new ListItem(cn, cn);

98                 ddlCountry.Items.Add(li);

99             }

100             //兴趣

101             CheckBoxList cbl = e.Row.FindControl("cbxlHobby") as CheckBoxList;

102             DataTable hobbyDt = dm.GetHobby();

103             ListItem hobbyLi = null;

104             string hstr = string.Empty;

105             for (int i = 0; i < hobbyDt.Rows.Count; i++)

106             {

107                 hstr = hobbyDt.Rows[i]["hobby"] as string;

108                 hobbyLi = new ListItem(hstr, hstr);

109                 cbl.Items.Add(hobbyLi);

110             }

111         }

112     }

113

114     /// <summary>

115 /// 分页控件的OnSelectedIndexChanged

116 /// </summary>

117 /// <param name="sender"></param>

118 /// <param name="e"></param>

119     protected void ddlPaging_OnSelectedIndexChanged(object sender, EventArgs e)

120     {

121         this.gv.PageIndex = (sender as DropDownList).SelectedIndex;

122         this.gv.DataSource = dm.GetDt();

123         this.gv.DataBind();

124     }

125

126     /// <summary>

127 /// 删除记录

128 /// </summary>

129 /// <param name="sender"></param>

130 /// <param name="e"></param>

131     protected void gv_OnRowDeleting(object sender, GridViewDeleteEventArgs e)

132     {

133         dm.DelRecord(Convert.ToInt32(this.gv.DataKeys[e.RowIndex].Value));

134         this.gv.PageIndex = 0;

135         this.gv.DataSource = dm.GetDt();

136         this.gv.DataBind();

137     }

138

139     /// <summary>

140 /// 修改记录

141 /// </summary>

142 /// <param name="sender"></param>

143 /// <param name="e"></param>

144     protected void gv_OnRowEditing(object sender, GridViewEditEventArgs e)

145     {

146         this.gv.EditIndex = e.NewEditIndex;

147         this.gv.DataSource = dm.GetDt();

148         this.gv.DataBind();

149     }

150

151     /// <summary>

152 /// 取消修改

153 /// </summary>

154 /// <param name="sender"></param>

155 /// <param name="e"></param>

156     protected void gv_OnRowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

157     {

158         this.gv.EditIndex = -1;

159         this.gv.DataSource = dm.GetDt();

160         this.gv.DataBind();

161     }

162

163     /// <summary>

164 /// 更新记录

165 /// </summary>

166 /// <param name="sender"></param>

167 /// <param name="e"></param>

168     protected void gv_OnRowUpdating(object sender, GridViewUpdateEventArgs e)

169     {

170         GridViewRow gvr = this.gv.Rows[e.RowIndex];

171         int id = Convert.ToInt32(this.gv.DataKeys[e.RowIndex].Value);

172         string name = (gvr.Cells[0].FindControl("tbxName") as TextBox).Text;

173         string sex = (gvr.Cells[1].FindControl("rblSexEdit") as RadioButtonList).SelectedValue;

174         string country = (gvr.Cells[2].FindControl("ddlCountry") as DropDownList).SelectedValue;

175         System.Text.StringBuilder hobbys = new System.Text.StringBuilder();

176         foreach (ListItem li in (gvr.Cells[3].FindControl("cbxlHobby") as CheckBoxList).Items)

177         {

178             if (li.Selected)

179                 hobbys.Append(li.Value+",");

180         }

181         if (hobbys.Length >= 2)

182             hobbys.Remove(hobbys.Length - 1, 1);

183         dm.UpdateRecord(id, name, country, sex, hobbys.ToString());

184

185         this.gv.EditIndex = -1;

186         this.gv.DataSource = dm.GetDt();

187         this.gv.DataBind();

188     }

189

190     /// <summary>

191 /// 提交新记录

192 /// </summary>

193 /// <param name="sender"></param>

194 /// <param name="e"></param>

195     protected void lbtnSubmit_OnClick(object sender, EventArgs e)

196     {

197         LinkButton lbtnSubmit = sender as LinkButton;

198         GridViewRow tr = lbtnSubmit.NamingContainer as GridViewRow;

199         string name = (tr.Cells[0].FindControl("tbxName") as TextBox).Text;

200         string sex = (tr.Cells[0].FindControl("rblSex") as RadioButtonList).SelectedValue;

201         string country = (tr.Cells[0].FindControl("ddlCountry") as DropDownList).SelectedValue;

202         System.Text.StringBuilder hobbys = new System.Text.StringBuilder();

203         foreach (ListItem li in (tr.Cells[0].FindControl("cbxlHobby") as CheckBoxList).Items)

204         {

205             if (li.Selected)

206                 hobbys.Append(li.Value + ",");

207         }

208         if (hobbys.Length >= 2)

209             hobbys.Remove(hobbys.Length - 1, 1);

210         dm.AddRecord(name,country,sex,hobbys.ToString());

211

212         this.gv.PageIndex = 0;

213         this.gv.DataSource = dm.GetDt();

214         this.gv.DataBind();

215     }

216

217     /// <summary>

218 /// 退出添加新记录

219 /// </summary>

220 /// <param name="sender"></param>

221 /// <param name="e"></param>

222     protected void lbtnCancel_OnClick(object sender, EventArgs e)

223     {

224         this.gv.DataSource = dm.GetDt();

225         this.gv.DataBind();

226     }

227

228     /// <summary>

229 /// 显示添加画面

230 /// </summary>

231 /// <param name="sender"></param>

232 /// <param name="e"></param>

233     protected void lbtnShowAdd_OnClick(object sender, EventArgs e)

234     {

235         this.gv.DataSource = null;

236         this.gv.DataBind();

237     }

238

239     /// <summary>

240 /// 排序

241 /// </summary>

242 /// <param name="sender"></param>

243 /// <param name="e"></param>

244     protected void gv_OnSorting(object sender, GridViewSortEventArgs e)

245     {

246         DataTable dt = dm.GetDt();

247         string direction = string.Empty;

248         if (e.SortDirection == (SortDirection)Enum.Parse(typeof(SortDirection),Convert.ToString(ViewState["Direction"])))

249             direction = "asc";

250         else

251             direction = "desc";

252         dt.DefaultView.Sort = string.Format("{0} {1}", e.SortExpression, direction);

253         ViewState["Direction"] = (direction.Equals("asc") ? SortDirection.Descending : SortDirection.Ascending);

254         this.gv.DataSource = dt;

255         this.gv.DataBind();

256     }

257 }

说明：

1.显示、编辑、新增时数据绑定都集中在gv_OnRowDataBound方法中，通过e.Row.RowType来分别处理。

2.排序：通过DataTable.DefaultView来实现，用一个ViewState变量存放最近一次的排序方向的反方向，来使每次排序的方向都不同。GridView的SortDirection为只读属性，所以别指望设定它来实现排序哦！

3.modify、update、delete和cancel按钮的实现利用GridView预设的CommandName来处理

当然也可以自己写OnCommand的处理代码来处理，就是烦一点。

数据操作类：

1 public class DataManager

2 {

3     private static DataTable dt = null;//用户记录

4     private static DataTable countryDt = null;//国籍

5     private static DataTable hobbyDt = null;//兴趣

6

7     public DataManager()

8     {

9         if (dt == null)

10         {

11             dt = new DataTable();

12             dt.Columns.Add("ID");

13             dt.Columns.Add("Name");

14             dt.Columns.Add("Sex");

15             dt.Columns.Add("Country");

16             dt.Columns.Add("Hobby");

17

18             //Default Data

19             dt.Rows.Add(new object[] { 1,"Mary","F","China","Cooking,Music"});

20             dt.Rows.Add(new object[] { 2, "John", "M", "China", "Tennis" });

21         }

22

23         if (countryDt == null)

24         {

25             countryDt=new DataTable();

26             countryDt.Columns.Add("cn");

27

28             //Default Data

29             countryDt.Rows.Add(new object[] { "China" });

30             countryDt.Rows.Add(new object[] { "French" });

31             countryDt.Rows.Add(new object[] { "America" });

32             countryDt.Rows.Add(new object[] { "Afria" });

33             countryDt.Rows.Add(new object[] { "Japan" });

34         }

35

36         if (hobbyDt == null)

37         {

38             hobbyDt = new DataTable();

39             hobbyDt.Columns.Add("hobby");

40

41             //Default Data

42             hobbyDt.Rows.Add(new object[] { "Cooking" });

43             hobbyDt.Rows.Add(new object[] { "Music" });

44             hobbyDt.Rows.Add(new object[] { "Reading" });

45             hobbyDt.Rows.Add(new object[] { "Movies" });

46             hobbyDt.Rows.Add(new object[] { "Tennis" });

47         }

48     }

49

50     public DataTable GetDt()

51     {

52         return dt;

53     }

54

55     public bool DelRecord(int id)

56     {

57         DataRow[] drs = dt.Select("ID=" + id);

58         bool result = false;

59         if (drs.Length == 1)

60         {

61             dt.Rows.Remove(drs[0]);

62             result = true;

63         }

64

65         return result;

66     }

67

68     public bool UpdateRecord(int id, string name, string country, string sex, string hobby)

69     {

70         DataRow[] drs = dt.Select("ID=" + id);

71         bool result = false;

72         if (drs.Length == 1)

73         {

74             drs[0]["Name"] = name;

75             drs[0]["Country"] = country;

76             drs[0]["Hobby"] = hobby;

77             drs[0]["Sex"] = sex;

78             result = true;

79         }

80

81         return result;

82     }

83

84     public bool AddRecord(string name, string country, string sex, string hobby)

85     {

86         DataRow[] drs = dt.Select();

87         Array.Sort<DataRow>(drs, new Comparison<DataRow>(SortHandler));

88         int newId = 1+Convert.ToInt32(drs[0]["ID"]);

89         dt.Rows.Add(new object[] {newId,name,sex,country,hobby });

90

91         return true;

92     }

93

94     private int SortHandler(DataRow arg1, DataRow arg2)

95     {

96         if (Convert.ToInt32(arg1["ID"]) == Convert.ToInt32(arg2["ID"]))

97             return 0;

98         else if (Convert.ToInt32(arg1["ID"]) < Convert.ToInt32(arg2["ID"]))

99             return 1;

100         else

101             return -1;

102     }

103

104     public DataTable GetCountry()

105     {

106         return countryDt;

107     }

108

109     public DataTable GetHobby()

110     {

111         return hobbyDt;

112     }

113 }

这里没什么好说的，就是AddRecord方法中用到了Array.Sort方法，这个方法我用得很少，不过觉得挺好用的，定义一个方法作为第二个参数传入就可以了。

总结：

　　不适用数据源控件的优点是，新增记录时可以马上看到新增的记录；缺点是即使实现了分页功能，但每次还是从数据库中读取全部数据，效率低。而使用ObejctDataSource来绑定就可以解决从数据库读取全部数据的问题，并且附带数据缓存（应用程序级缓存）的功能，省心多了。但却又因ObjectDataSource不支持重新绑定，而使新增记录时不能马上看到新增的记录的缺点。

　　关于ObjectDataSource配合GridView的使用将在《GridView实战二：使用ObjectDataSource数据源控件》讲述。

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