gridview动态添加行的原理就是用datatable增加新列然后重新绑定；
设计源码
设计gridview代码
< asp:GridView ID = " gvFrontendTypeSetting " runat = " server " AutoGenerateColumns = " false " CssClass = " table " OnRowDeleting = " gvFrontendTypeSetting_RowDeleting " > < Columns > < asp:TemplateField HeaderText = " 序号 " > < ItemTemplate > < div align = " center " > < asp:TextBox ID = " txtSerialNumber " runat = " server " Width = " 20px " Text = ' <%#Eval("serialNumber")%> ' BorderStyle = " None " ></ asp:TextBox > </ div > </ ItemTemplate > </ asp:TemplateField > < asp:TemplateField HeaderText = " 商品筛选类型 " > < ItemTemplate > < asp:TextBox ID = " txtType " runat = " server " Text = ' <%#Eval("type")%> ' BorderStyle = " None " ></ asp:TextBox > </ ItemTemplate > < ItemStyle Width = " 100px " /> </ asp:TemplateField > < asp:TemplateField HeaderText = " 修改时间 " > < ItemTemplate > < div align = " center " > < asp:Label runat = " server " ID = " lblModificationTime " Text = ' <%#Eval("modifiedTime")%> ' BorderStyle = " None " ></ asp:Label > </ div > </ ItemTemplate > </ asp:TemplateField > < asp:TemplateField HeaderText = " 修改人 " > < ItemTemplate > < div align = " center " > < asp:Label runat = " server " ID = " lblModificationName " Text = ' <%#Eval("modifiedName")%> ' BorderStyle = " None " ></ asp:Label > </ div > </ ItemTemplate > </ asp:TemplateField > < asp:TemplateField HeaderText = " 操作 " > < ItemTemplate > < div align = " center " > < asp:Button ID = " btnDel " runat = " server " Text = " 删除 " CommandName = " delete " /> < asp:Button ID = " btnEdit " runat = " server " Text = " 修改 " CommandName = " Edit " /> </ div > </ ItemTemplate > </ asp:TemplateField > </ Columns > </ asp:GridView > 首先我们需要在初始化的时候，新建table并同时新建一个列，以便在初始化的时候就有一个新列可使用
/// <summary> /// Init the gvFrontendTypeSetting to show /// </summary> private void InitGVFrontendTypeSetting() { // Create a datatable instance DataTable tbScratchCard = new DataTable(); // column one DataColumn colSerialNumber = new DataColumn(); colSerialNumber.DataType = System.Type.GetType( " System.Int32 " ); colSerialNumber.ColumnName = " serialNumber " ; // column two DataColumn colType = new DataColumn(); colType.DataType = System.Type.GetType( " System.String " ); colType.ColumnName = " type " ; // column three DataColumn colModifiedTime = new DataColumn(); colModifiedTime.DataType = System.Type.GetType( " System.DateTime " ); colModifiedTime.ColumnName = " modifiedTime " ; // column four DataColumn colModifiedName = new DataColumn(); colModifiedName.DataType = System.Type.GetType( " System.String " ); colModifiedName.ColumnName = " modifiedName " ; // DataColumnCollection DataColumn[] cols = { colSerialNumber, colType, colModifiedTime, colModifiedName }; // Add columns to the table tbScratchCard tbScratchCard.Columns.AddRange(cols); // Add a new row to the table tbScratchCard tbScratchCard.Rows.Add(tbScratchCard.NewRow()); tbScratchCard.Rows[ 0 ][ " serialNumber " ] = tbScratchCard.Rows.Count - 1 ; tbScratchCard.Rows[ 0 ][ " modifiedTime " ] = DateTime.Now; tbScratchCard.Rows[ 0 ][ " modifiedName " ] = ((User)Session[ " user " ]).AccountName; ViewState[ " tbCategory " ] = tbScratchCard; // Bind the table to the gridview gvFrontendTypeSetting.DataSource = tbScratchCard; gvFrontendTypeSetting.DataBind(); } 如果初始化的时候需要给某列进行赋值，比如当前时间和当前用户，可以给第一行的值赋值，同时我们需要把建立好的datatable结构给viewstate或者session以便我们后续的新加行，删除等操作，有了上面的代码后我们在初始化的时候就能看到我们设计的界面，同时会有一个新行已经初始化
点击新增行按钮
/// <summary> /// 添加行 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void btnAddType_Click( object sender, EventArgs e) { DataTable tbCategory = (DataTable)ViewState[ " tbCategory " ]; for ( int i = 0 ; i <= tbCategory.Rows.Count - 1 ; i ++ ) { tbCategory.Rows[i][ " serialNumber " ] = Convert.ToInt32(((TextBox)gvFrontendTypeSetting.Rows[i].Cells[ 0 ].FindControl( " txtSerialNumber " )).Text); tbCategory.Rows[i][ " type " ] = ((TextBox)gvFrontendTypeSetting.Rows[i].Cells[ 0 ].FindControl( " txtType " )).Text; tbCategory.Rows[i][ " modifiedTime " ] = ((Label)gvFrontendTypeSetting.Rows[i].Cells[ 0 ].FindControl( " lblModificationTime " )).Text; tbCategory.Rows[i][ " modifiedName " ] = ((Label)gvFrontendTypeSetting.Rows[i].Cells[ 0 ].FindControl( " lblModificationName " )).Text; } // Add new row tbCategory.Rows.Add(tbCategory.NewRow()); tbCategory.Rows[tbCategory.Rows.Count - 1 ][ " serialNumber " ] = tbCategory.Rows.Count - 1 ; tbCategory.Rows[tbCategory.Rows.Count - 1 ][ " modifiedTime " ] = DateTime.Now; tbCategory.Rows[tbCategory.Rows.Count - 1 ][ " modifiedName " ] = ((User)Session[ " user " ]).AccountName; ViewState[ " tbCategory " ] = tbCategory; // Bind the table to the gridview gvFrontendTypeSetting.DataSource = tbCategory; gvFrontendTypeSetting.DataBind(); } 这里我们首先要得到我们在初始化的时候建立的datatable数据结构，然后我们获得用户填写的数据，这里主要是因为，当用户修改数据时我们可以动态的获取用户修改的值，避免用户新增加一行保存一行所带来的不便。把数据保存到datatable中后我们再添加一个新行，同样，有一些初始值我们需要给初始化出来，再新添加行之后，我们需要把数据结构赋给viewstate或者session然后和gridview绑定，这样动态新增行就搞定了；
好吧再来一个动态删除行的code，如下
/// <summary> /// 删除 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void gvFrontendTypeSetting_RowDeleting( object sender, GridViewDeleteEventArgs e) { int number = Convert.ToInt32(((TextBox)gvFrontendTypeSetting.Rows[e.RowIndex].FindControl( " txtSerialNumber " )).Text); DataTable tbCategory = (DataTable)ViewState[ " tbCategory " ]; for ( int i = 0 ; i <= tbCategory.Rows.Count - 1 ; i ++ ) { if (Convert.ToInt32(tbCategory.Rows[i][ " serialNumber " ]) == number) { tbCategory.Rows.RemoveAt(i); } } ViewState[ " tbCategory " ] = tbCategory; gvFrontendTypeSetting.DataSource = tbCategory; gvFrontendTypeSetting.DataBind(); } 这里是我们首先要找到gridview中能唯一标示这行数据的值，然后获得datatable的数据结构，再根据gridview数据行的唯一标示在datatable中循环，如果某行中的某个字段的值行gridview中的行唯一标示相等，则移除当前行，同样把修改后的数据结构绑定给viewstate或者session，然后重新绑定；
总体就是在初始化的时候需要把数据结构的建立起来，并新建一行，并把数据结构给viewstate或者session，然后如果做其他操作就需要先活动这个数据结构，再做其他的修改，同样做完修改后需要把新的数据结构赋给viewstate或者session，以便实时更新viewstate或者session，然后绑定。
本文转自shenzhoulong 51CTO博客，原文链接：http://blog.51cto.com/shenzhoulong/662781，如需转载请自行联系原作者