如何让GridView局部控件不更新

Question

部分代码如下：        
<asp:UpdatePanel ID="UpdatePanel4" runat="server"  >
      <ContentTemplate><asp:GridView ID="GridViewOtherDevice" runat="server"  CssClass="Grid_01" 
                BackColor="#F6F6F6" Width="780px" AutoGenerateColumns="False"   
                  OnRowCommand="GridViewOtherDevice_RowCommand" AllowSorting=True >
            <Columns>
                <asp:TemplateField ShowHeader="False">
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkButtonOtherDevice" runat="server" CausesValidation="False"  CommandArgument='<%# Eval("ID")%>' 
                            CommandName="Agree" Text="批准"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>                <asp:BoundField DataField="ID"  HeaderText="编号" />                <asp:TemplateField  SortExpression="State" ItemStyle-Width="50px">
                    <HeaderTemplate>
                        状态
                        <asp:DropDownList ID="DDLState" runat="server" AutoPostBack=true OnSelectedIndexChanged="DDL_SelectChanged" >
                            <asp:ListItem Value="所有">所有</asp:ListItem>
                            <asp:ListItem Value="还">还</asp:ListItem>
                            <asp:ListItem Value="催还">催还</asp:ListItem>
                        </asp:DropDownList>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("State") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Type"  HeaderText="设备类型" />
 
                <asp:BoundField DataField="Res"  HeaderText="备注" />
            </Columns>
        </asp:GridView>
                     
        </ContentTemplate>
</asp:UpdatePanel>
出现的问题：我选择DropDownList 的某个选项(如"催还")后，触发DDL_SelectChanged，页面返回更新的GridView信息，但是同时DropDownList中的选项又变成初始选项(所有")，怎么样让DropDownList的选项不还原为初始
问题补充：如果DropDownList如果不在GridView内部，就不会还原为初始选项。
各位前辈帮忙看看。谢谢啦

Answer 1

选择的绑定的时候记录Dropdownlist的selectindex绑定完毕后 指定Dropdownlist 的selectindex.

Answer 2

我试过了后台中，在DropDownlist本身的DDL_SelectChanged里给它指定初始值，这样反而照成没有筛选的效果补充：这里GridView中的DropDownlist相当于自制的表头筛选器

Answer 3

绑定数据源的时候
if(!isPostPack)
{
Gridview1.datasource=数据源；
GrideView1.databind();
}

Answer 4

asp:UpdatePanel 
拖一个无刷新控件上去

Answer 5

整个GridView已经在asp:UpdatePanel里了

Answer 6

后台代码。我把DDL_SelectChanged的贴出来，其它的不相关的很长。
    protected void DDL_SelectChanged(Object sender, EventArgs e)
    {
        DropDownList DDL = sender as DropDownList;
        string ParName = DDL.ID;
        string ParSqlName = DDL.ID.Remove(0, 3);
        string PartSelectCommand = "(" + ParSqlName + "=@" + ParName + ") AND ";
        string ParValue= DDL.SelectedValue;
        if (SqlDataSourceOtherDevice.SelectParameters[ParName] != null)
        {
            SqlDataSourceOtherDevice.SelectParameters.Remove(SqlDataSourceOtherDevice.SelectParameters[ParName]);
        }
        if (ParValue == "所有")
        {
            SqlDataSourceOtherDevice.SelectCommand = SqlDataSourceOtherDevice.SelectCommand.Replace(PartSelectCommand, " ");
        }
        else
        {
            SqlDataSourceOtherDevice.SelectParameters.Add(ParName, ParValue);
            if (!SqlDataSourceOtherDevice.SelectCommand.Contains(PartSelectCommand))
            {
                SqlDataSourceOtherDevice.SelectCommand = SqlDataSourceOtherDevice.SelectCommand.Replace("WHERE ","WHERE "+PartSelectCommand);
            }
        }
        GridViewOtherDevice.DataBind();        
    }

Answer 7

怎么用啊异步方式，我不会。 我这GridView里只要表头不更新

Answer 8

本人试出了一个比较别扭的方法。
把DropDownList放在Gridview外头隐藏起来，GridView里用一个select代替它，然后用编码把两者联动起来.aspx文件相关代码：
        <div class="DisplayNone">
                                                 <asp:DropDownList ID="DDLState" runat="server" AutoPostBack=true OnSelectedIndexChanged="DDL_SelectChanged"  >
                            <asp:ListItem Value="所有"  >所有</asp:ListItem>
                            <asp:ListItem Value="还" >还</asp:ListItem>
                            <asp:ListItem Value="催还" >催还</asp:ListItem>
                        </asp:DropDownList></div>
<asp:UpdatePanel ID="UpdatePanel4" runat="server" >
  <ContentTemplate><asp:GridView ID="GridViewOtherDevice" runat="server" CssClass="Grid_01"  
  BackColor="#F6F6F6" Width="780px" AutoGenerateColumns="False"   
  OnRowCommand="GridViewOtherDevice_RowCommand" AllowSorting=True >
  <Columns>
  <asp:TemplateField ShowHeader="False">
  <ItemTemplate>
  <asp:LinkButton ID="LinkButtonOtherDevice" runat="server" CausesValidation="False" CommandArgument='<%# Eval("ID")%>'  
  CommandName="Agree" Text="批准"></asp:LinkButton>
  </ItemTemplate>
  </asp:TemplateField>  <asp:BoundField DataField="ID" HeaderText="编号" />  <asp:TemplateField SortExpression="State" ItemStyle-Width="50px">
  <HeaderTemplate>
  状态
                        <select id="SelectState"  onchange="StateChange()"   />
                                <option value="所有"  <% =(test("ctl00$CPHBody$DDLState")=="所有"?"selected=selected ":"") %> >所有</option>
                                <option value="还"  <% =(test("ctl00$CPHBody$DDLState")=="还"?"selected=selected ":"") %>  >还</option>
                                <option value="催还"  <% =(test("ctl00$CPHBody$DDLState")=="催还"?"selected=selected ":"") %> >催还</option>
                            </select>
  </HeaderTemplate>
  <ItemTemplate>
  <asp:Label ID="Label1" runat="server" Text='<%# Bind("State") %>'></asp:Label>
  </ItemTemplate>
  </asp:TemplateField>
  <asp:BoundField DataField="Type" HeaderText="设备类型" />
  
  <asp:BoundField DataField="Res" HeaderText="备注" />
  </Columns>
  </asp:GridView>
    
  </ContentTemplate>
</asp:UpdatePanel>
JS文件相关代码：
function StateChange()
{
    document.getElementById("ctl00_CPHBody_DDLState").value=document.getElementById("SelectState").value
    __doPostBack("ctl00$CPHBody$DDLState","");
}.cs文件相关代码
    protected void DDL_SelectChanged(Object sender, EventArgs e)
    {
        DropDownList DDL = sender as DropDownList;
        string ParName = DDL.ID;
        string ParSqlName = DDL.ID.Remove(0, 3);
        string PartSelectCommand = "(" + ParSqlName + "=@" + ParName + ") AND ";
        string ParValue= DDL.SelectedValue;
        if (SqlDataSourceOtherDevice.SelectParameters[ParName] != null)
        {
            SqlDataSourceOtherDevice.SelectParameters.Remove(SqlDataSourceOtherDevice.SelectParameters[ParName]);
        }
        if (ParValue == "所有")
        {
            SqlDataSourceOtherDevice.SelectCommand = SqlDataSourceOtherDevice.SelectCommand.Replace(PartSelectCommand, " ");
        }
        else
        {
            SqlDataSourceOtherDevice.SelectParameters.Add(ParName, ParValue);
            if (!SqlDataSourceOtherDevice.SelectCommand.Contains(PartSelectCommand))
            {
                SqlDataSourceOtherDevice.SelectCommand = SqlDataSourceOtherDevice.SelectCommand.Replace("WHERE ","WHERE "+PartSelectCommand);
            }
        }
        GridViewOtherDevice.DataBind();  
    }    public string test(string Conid)
    {
        DropDownList theDDL = FindControl(Conid) as DropDownList;
                return theDDL.SelectedValue;
    }