求达人帮忙看一下,Original为什么取不到值,我已经把那一句注释了
<%@ Import NameSpace=System.Data %>
<%@ Import NameSpace=System.Data.Common %>
<%@ page language= "cs " runat=server debug=true %>
<html>
<head>
<script runat=server>
void Page_Load(Object Sender,EventArgs e)
{
DataTable objTable=new DataTable( "NewTable ");
objTable.Columns.Add( "ISBN ",System.Type.GetType
( "System.String "));
objTable.Columns.Add( "Title ",System.Type.GetType
( "System.String "));
objTable.Columns.Add( "PublicationDate ",System.Type.GetType
( "System.DateTime "));
objTable.Columns.Add( "Quantity ",System.Type.GetType
( "System.Int32 "));
DataRow objDataRow;
objDataRow=objTable.NewRow();
objDataRow[ "ISBN "]= "123456 ";
objDataRow[ "Title "]= "AAAAA ";
objDataRow[ "PublicationDate "]= "2001-06-01 ";
objDataRow[ "Quantity "]=3956;
objTable.Rows.Add(objDataRow);
objDataRow=objTable.NewRow();
objDataRow[ "ISBN "]= "123232 ";
objDataRow[ "Title "]= "BBBBBB ";
objDataRow[ "PublicationDate "]= "2001-05-11 ";
objDataRow[ "Quantity "]=3433;
objTable.Rows.Add(objDataRow);
objDataRow=objTable.NewRow();
objDataRow[ "ISBN "]= "232432 ";
objDataRow[ "Title "]= "CCCCCC ";
objDataRow[ "PublicationDate "]= "2002-01-21 ";
objDataRow[ "Quantity "]=3256;
objTable.Rows.Add(objDataRow);
DataSet objDataSet=new DataSet( "BookDataSet ");
objDataSet.Tables.Add(objTable);
gd1.DataSource=objDataSet.Tables[ "NewTable "].DefaultView;
gd1.DataBind();
DataRow myRow=objTable.Rows[0];
myRow.BeginEdit();
myRow[ "ISBN "]= "999 ";
gd2.DataSource=objDataSet.Tables[ "NewTable "].DefaultView;
gd2.DataBind();
//label1.Text+=myRow[ "ISBN ",DataRowVersion.Original].ToString(); 取不到值
label2.Text+=myRow[ "ISBN ",DataRowVersion.Proposed].ToString();
label3.Text+=myRow[ "ISBN ",DataRowVersion.Current].ToString();
}
</script>
</head>
<body>
原始表： <br/>
<asp:DataGrid id=gd1 runat=server/> <p>
更改了第一行的标BeginEdit() <br/>
<asp:DataGrid id=gd2 runat=server/> <p>
更改后又取消了更改的表CancelEdit() <br/>
<asp:label id=label1 text= "Original= " runat=server/> <p>
<asp:label id=label2 text= "Proposed= " runat=server/> <p>
<asp:label id=label3 text= "Current= " runat=server/> <p>
<asp:DataGrid id=gd3 runat=server/> <p>
再次进行编辑的标BeginEdit() <br/>
<asp:DataGrid id=gd4 runat=server/> <p>
编辑后确定的表EndEdit() <br/>
<asp:DataGrid id=gd5 runat=server/> <p>
</body>
</html>
[解决办法]
沙发，帮忙顶
[解决办法]
//label1.Text+=myRow[ "ISBN ",DataRowVersion.Original].ToString(); 取不到值
＝＝＝＝＝＝＝＝＝＝＝＝
因为这行的 DataRowVersion 不属于 Original
这样的数据是 Add 进来的，还没有调用 AcceptChanges 其 DataRowState 是 Added，
自然其 DataRowVersion 不可能是 Original （原始版本）
关联信息太多，一两句没有办法说清楚，自己看看这里的详细说明吧：
DataRowVersion 枚举
msdn2.microsoft.com/zh-cn/library/system.data.datarowversion.aspx