给DropDownList添加title属性后刷新页面没有title了

Question

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
         <ContentTemplate>
             <dl>
                <dt>企业：</dt>
                <dd>
                    <asp:DropDownList ID="ddlCompany" runat="server" AutoPostBack="True" 
                        onselectedindexchanged="ddlCompany_SelectedIndexChanged">
                        <asp:ListItem Value="-1">请选择</asp:ListItem>
                    </asp:DropDownList>
                </dd>
            </dl>
            <dl>
                <dt>线路：</dt>
                <dd>
                    <asp:DropDownList ID="ddlLine" runat="server">
                        <asp:ListItem Value="-1">请选择</asp:ListItem>
                    </asp:DropDownList>
                </dd>
            </dl>
            </ContentTemplate>
         </asp:UpdatePanel>
 if (!IsPostBack)
        {
            InitOrganization(this.ddlCompany);         }  public void InitOrganization(DropDownList ddlCompany)
    {
        IList<OrganizationEntity> orgList=GetOrgByType("企业");
        ddlCompany.DataSource = orgList;
        ddlCompany.DataTextField = "Short"; //绑定的是简写
        ddlCompany.DataValueField = "OrganizationId";
        ddlCompany.DataBind();
        for (int i = 0; i < orgList.Count; i++)
        {
            ddlCompany.Items[i].Attributes.Add("title", orgList[i].Name); //title出来的是全写
        }
        ddlCompany.Items.Insert(0, new ListItem("请选择", "-1")); 
    }但是联动的时候title消失了,没办法,我只能重新在联动那里在加一次//联动
  protected void ddlCompany_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ddlCompany.SelectedValue != "-1")
        {
            int companyId = Convert.ToInt32(ddlCompany.SelectedValue);
            ddlLine.DataSource =GetListByOrgId(companyId);
            ddlLine.DataTextField = "Name";
            ddlLine.DataValueField = "LineId";
            ddlLine.DataBind();
            ddlLine.Items.Insert(0, new ListItem("请选择", "-1"));
            IList<OrganizationEntity> orgList=GetOrgByType("企业");
            for (int i = 0; i < orgList.Count; i++)
            {
                ddlCompany.Items[i + 1].Attributes.Add("title", orgList[i].Name);
            }
        }
        else
        {
            ddlLine.Items.Clear();
            ddlLine.Items.Insert(0, new ListItem("请选择", "-1"));
        }    }
但是我查询数据,页面刷新了,title属性又没了

Answer 1

如果方法写在外面的话应该怎么改啊..最好页面不需要改,改页面就改的太多了,改方法就少一些
InitOrganization(this.ddlCompany); 
if (!IsPostBack)
        {
                    }

Answer 2

  protected void PreRender(object sender, EventArgs e){
   你写在这里看行不
}

Answer 3

方法写在外面没次刷新的时候 都要用ViewState或者Session记录Dropdownlist的选择索引如果不为空就给他赋上去 保存索引值就可以了。

Answer 4

IList<OrganizationEntity> orgList=GetOrgByType("企业");
        ddlCompany.DataSource = orgList;
        ddlCompany.DataTextField = "Short"; //绑定的是简写
        ddlCompany.DataValueField = "OrganizationId";
        ddlCompany.DataBind();
        for (int i = 0; i < orgList.Count; i++)
        {
            ddlCompany.Items[i].Attributes.Add("title", orgList[i].Name); //title出来的是全写
        }
        ddlCompany.Items.Insert(0, new ListItem("请选择", "-1")); 

Answer 5

 protected override void EnsureChildControls()
        {
            IList<OrganizationEntity> orgList=GetOrgByType("企业");
        ddlCompany.DataSource = orgList;
        ddlCompany.DataTextField = "Short"; //绑定的是简写
        ddlCompany.DataValueField = "OrganizationId";
        ddlCompany.DataBind();
        for (int i = 0; i < orgList.Count; i++)
        {
            ddlCompany.Items[i].Attributes.Add("title", orgList[i].Name); //title出来的是全写
        }
        ddlCompany.Items.Insert(0, new ListItem("请选择", "-1"));         }

Answer 6

if (!IsPostBack)
        {
           在这里试下          }

Answer 7

5楼这个是写在哪里啊,那我以前那个 InitOrganization(this.ddlCompany); 还要不

Answer 8

这样试试
if (!IsPostBack)
{
     InitOrganization(this.ddlCompany); 
}
public void InitOrganization(DropDownList ddlCompany)
{
     IList<OrganizationEntity> orgList=GetOrgByType("企业");
     ddlCompany.DataSource = orgList;
     ddlCompany.DataTextField = "Short"; //绑定的是简写
      ddlCompany.DataValueField = "OrganizationId";
     ddlCompany.DataBind();
}
protected override void EnsureChildControls()
{
      for (int i = 0; i < ddlCompany.Items.Count; i++)
      {
          ddlCompany.Items[i].Attributes.Add("title", ddlCompany.Items[i].Text); //title出来的是全写
       }
      ddlCompany.Items.Insert(0, new ListItem("请选择", "-1")); 
}

Answer 9

protected override void EnsureChildControls() //很多控件都调用了这个方法,执行了好多次哦
{
      for (int i = 0; i < ddlCompany.Items.Count; i++)
      {
          ddlCompany.Items[i].Attributes.Add("title", ddlCompany.Items[i].Text); //title出来的是全写 ,这样不行的,我的title不是它的Text,Text是简写的,title才是全称,这样的话,又要查询数据库一次了,已经解决了,还是谢谢你
       }
      ddlCompany.Items.Insert(0, new ListItem("请选择", "-1")); 
}