获取模版列中按钮事件所在行的关键字

被常常问到的一个经典问题了，答案放到网上来。

步骤
1 ASP.NET的这个地方这样设置。GridView加入 OnRowCommand 事件，模版列的按钮设置CommandArgument、CommandName

< asp:GridView ID = " GridView1 " runat = " server " AutoGenerateColumns = " False " OnRowDataBound = " dgItemDataBound "
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PageSize = " 15 " Width = " 100% " AllowPaging = " True " BorderWidth = " 0px " CellPadding = " 2 " CellSpacing = " 1 " OnRowCommand = " GridView1_RowCommand " OnRowEditing = " GridView1_RowEditing " OnRowCreated = " GridView1_RowCreated " OnRowDeleting = " GridView1_RowDeleting " >
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< Columns >
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< asp:BoundField DataField = " TableField_ID " HeaderText = " 编号 " Visible = False />
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< asp:BoundField DataField = " TbName " HeaderText = " 表名称 " />
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< asp:HyperLinkField DataTextField = " FdName " SortExpression = " FdName " HeaderText = " 字段名称 " DataNavigateUrlFields = " FdName " DataNavigateUrlFormatString = " DdCreateField.aspx?FdName={0} " ></ asp:HyperLinkField >
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< asp:HyperLinkField DataTextField = " Descr " SortExpression = " Descr " HeaderText = " 字段描述 " DataNavigateUrlFields = " FdName " DataNavigateUrlFormatString = " DdCreateField.aspx?FdName={0} " ></ asp:HyperLinkField >
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< asp:BoundField DataField = " SequenceNo " HeaderText = " 顺序 " />
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< asp:BoundField DataField = " KeyField " HeaderText = " 主键 " />
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< asp:TemplateField HeaderText = " 增加 " >
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< ItemTemplate >
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< asp:ImageButton CommandArgument = ' <%# DataBinder.Eval(Container.DataItem,"TbName") %> ' id = ImageButton1 runat = " server " ImageUrl = ' ../images/icon_add.gif ' CommandName = " Add " ImageAlign = " AbsMiddle " >
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</ asp:ImageButton >
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</ ItemTemplate >
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< ItemStyle HorizontalAlign = " Center " Width = " 30px " />
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</ asp:TemplateField >
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< asp:TemplateField HeaderText = " 修改 " >
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< ItemTemplate >
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< asp:ImageButton id = ImageButton2 runat = " server " ImageUrl = ' ../images/icon_edit.gif ' CommandName = " Edit " ImageAlign = " AbsMiddle " >
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</ asp:ImageButton >
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</ ItemTemplate >
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< ItemStyle HorizontalAlign = " Center " Width = " 30px " />
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</ asp:TemplateField >
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< asp:TemplateField HeaderText = " 删除 " >
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< ItemTemplate >
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< asp:ImageButton id = ImageButton3 runat = " server " ImageUrl = ' ../images/icon_delete.gif ' CommandName = " Delete " ImageAlign = " AbsMiddle " >
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</ asp:ImageButton >
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</ ItemTemplate >
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