问题的起源：
1，允许显示的范围固定，宽和高都远远超出了指定的显示范围。
2，纵向滚动条必须在行头以下显示。
使用【position:absolute;】和【滚动对象的scrollLeft】实现行头的固定
代码
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body style="margin: 0px;" onload="onload();" tabindex="-1" oncontextmenu="return false;">
<form id="form1" runat="server">
<table id="tbHeader" style="position:absolute;background-color:White;top:10px;">
<tr>
<td style="color:Blue;" class="firstcol">施設名</td>
<td class="secondcol">種別</td>
<td class="thirdcol">所在地</td>
</tr>
</table>
<div id="div_Container" style="290px;height:270px;overflow:auto;margin-top:30px;" onscroll="onScroll();">
<asp:ObjectDataSource ID="LandmarkObjectDataSource" runat="server"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetLandmark"
TypeName="ChinTai.WorkLogic.G1005Logic"
OnSelected="LandmarkObjectDataSource_Selected">
<SelectParameters>
<asp:SessionParameter Name="name" SessionField="LandmarkQueryData" Type="String" />
<asp:Parameter Direction="Output" Name="resultText" Type="String" />
<asp:Parameter Direction="Output" Name="refX" Type="String" />
<asp:Parameter Direction="Output" Name="refY" Type="String" />
<asp:Parameter Direction="Output" Name="errorMsg" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
<asp:GridView ID="LandmarkGridView" runat="server" DataSourceID="LandmarkObjectDataSource" EmptyDataRowStyle-ForeColor="Red" AutoGenerateColumns="False" BorderWidth="0px" ShowHeader="false" EnableViewState="False" OnRowCreated="LandmarkGridView_RowCreated">
<headerstyle Font-Size="10pt" Font-Names="ＭＳ ゴシック" HorizontalAlign="Left"/>
<Columns>
<asp:BoundField DataField="LANDMARKNAME" HeaderStyle-ForeColor="Blue" HeaderText=" 施設名" SortExpression="LANDMARKNAME" HtmlEncode="False" ShowHeader="true">
<ItemStyle Wrap="False" CssClass="firstcol" Width="40%"/>
</asp:BoundField>
<asp:BoundField DataField="KIND_NAME2" HeaderText=" 種別" SortExpression="KIND_NAME2" ShowHeader="true" >
<ItemStyle Wrap="False" CssClass="secondcol" Width="20%"/>
</asp:BoundField>
<asp:BoundField DataField="FULLADDR" HeaderText=" 所在地" SortExpression="FULLADDR" ShowHeader="true" >
<ItemStyle Wrap="False" CssClass="thirdcol" />
</asp:BoundField>
</Columns>
</asp:GridView>
</div>
</form>
<script type="text/javascript">
function onload() {
var obj_TableList = document.getElementById("LandmarkGridView");
var obj_TableHeader = document.getElementById("tbHeader");
if (obj_TableList.rows[0].cells.length == 1) {
obj_TableHeader.style.visibility = "hidden";
obj_TableHeader.style.display = "none";
}
else {
obj_TableHeader.visibility = "visible";
obj_TableHeader.style.display = "block";
}
if (obj_TableList.rows[0].cells.length == 1){
var divObj = document.getElementById("div_Container");
divObj.style.marginTop = 0;
}
else{
var gridviewObj = document.getElementById("LandmarkGridView");
var parentNodeDIV = gridviewObj.parentNode;
var tbHeaderObj = document.getElementById("tbHeader");
tbHeaderObj.style.width = gridviewObj.offsetWidth;
tbHeaderObj.rows[0].cells[0].style.width = gridviewObj.rows[0].cells[0].offsetWidth-10;
tbHeaderObj.rows[0].cells[1].style.width = gridviewObj.rows[0].cells[1].offsetWidth;
tbHeaderObj.rows[0].cells[0].style.paddingLeft = 10;
tbHeaderObj.rows[0].cells[1].style.paddingLeft = 0;
tbHeaderObj.rows[0].cells[2].style.paddingLeft = 0;
}
}
function onScroll() {
var tbHeaderObj = document.getElementById("tbHeader");
var divObj = document.getElementById("div_Container");
tbHeaderObj.style.left = 0 - divObj.scrollLeft;
tbHeaderObj.style.top = 10;
}
</script>
</body>
</html>
<head runat="server">
<title>Untitled Page</title>
</head>
<body style="margin: 0px;" onload="onload();" tabindex="-1" oncontextmenu="return false;">
<form id="form1" runat="server">
<table id="tbHeader" style="position:absolute;background-color:White;top:10px;">
<tr>
<td style="color:Blue;" class="firstcol">施設名</td>
<td class="secondcol">種別</td>
<td class="thirdcol">所在地</td>
</tr>
</table>
<div id="div_Container" style="290px;height:270px;overflow:auto;margin-top:30px;" onscroll="onScroll();">
<asp:ObjectDataSource ID="LandmarkObjectDataSource" runat="server"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetLandmark"
TypeName="ChinTai.WorkLogic.G1005Logic"
OnSelected="LandmarkObjectDataSource_Selected">
<SelectParameters>
<asp:SessionParameter Name="name" SessionField="LandmarkQueryData" Type="String" />
<asp:Parameter Direction="Output" Name="resultText" Type="String" />
<asp:Parameter Direction="Output" Name="refX" Type="String" />
<asp:Parameter Direction="Output" Name="refY" Type="String" />
<asp:Parameter Direction="Output" Name="errorMsg" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
<asp:GridView ID="LandmarkGridView" runat="server" DataSourceID="LandmarkObjectDataSource" EmptyDataRowStyle-ForeColor="Red" AutoGenerateColumns="False" BorderWidth="0px" ShowHeader="false" EnableViewState="False" OnRowCreated="LandmarkGridView_RowCreated">
<headerstyle Font-Size="10pt" Font-Names="ＭＳ ゴシック" HorizontalAlign="Left"/>
<Columns>
<asp:BoundField DataField="LANDMARKNAME" HeaderStyle-ForeColor="Blue" HeaderText=" 施設名" SortExpression="LANDMARKNAME" HtmlEncode="False" ShowHeader="true">
<ItemStyle Wrap="False" CssClass="firstcol" Width="40%"/>
</asp:BoundField>
<asp:BoundField DataField="KIND_NAME2" HeaderText=" 種別" SortExpression="KIND_NAME2" ShowHeader="true" >
<ItemStyle Wrap="False" CssClass="secondcol" Width="20%"/>
</asp:BoundField>
<asp:BoundField DataField="FULLADDR" HeaderText=" 所在地" SortExpression="FULLADDR" ShowHeader="true" >
<ItemStyle Wrap="False" CssClass="thirdcol" />
</asp:BoundField>
</Columns>
</asp:GridView>
</div>
</form>
<script type="text/javascript">
function onload() {
var obj_TableList = document.getElementById("LandmarkGridView");
var obj_TableHeader = document.getElementById("tbHeader");
if (obj_TableList.rows[0].cells.length == 1) {
obj_TableHeader.style.visibility = "hidden";
obj_TableHeader.style.display = "none";
}
else {
obj_TableHeader.visibility = "visible";
obj_TableHeader.style.display = "block";
}
if (obj_TableList.rows[0].cells.length == 1){
var divObj = document.getElementById("div_Container");
divObj.style.marginTop = 0;
}
else{
var gridviewObj = document.getElementById("LandmarkGridView");
var parentNodeDIV = gridviewObj.parentNode;
var tbHeaderObj = document.getElementById("tbHeader");
tbHeaderObj.style.width = gridviewObj.offsetWidth;
tbHeaderObj.rows[0].cells[0].style.width = gridviewObj.rows[0].cells[0].offsetWidth-10;
tbHeaderObj.rows[0].cells[1].style.width = gridviewObj.rows[0].cells[1].offsetWidth;
tbHeaderObj.rows[0].cells[0].style.paddingLeft = 10;
tbHeaderObj.rows[0].cells[1].style.paddingLeft = 0;
tbHeaderObj.rows[0].cells[2].style.paddingLeft = 0;
}
}
function onScroll() {
var tbHeaderObj = document.getElementById("tbHeader");
var divObj = document.getElementById("div_Container");
tbHeaderObj.style.left = 0 - divObj.scrollLeft;
tbHeaderObj.style.top = 10;
}
</script>
</body>
</html>