如何隐藏列值的数据列表为空 [英] How to hide datalist of column value is null

问题描述

<asp:DataList ID="grdprof" runat="server">
                                 <itemtemplate>
                                  <div>
                                   <a href="%3C%25#%20Eval(%22Prospectus_mention_File1%22)%25%3E" target="_blank" title="Prospectus mention Link">
                                   <asp:Image ID="userPhoto" ImageUrl="~/images/File.png"  runat="server" />
                                   </a>
                                      <a href="%3C%25#%20Eval(%22Prospectus_mention_File2%22)%25%3E" target="_blank" title="Prospectus mention Link">
                                   <asp:Image ID="Image1" ImageUrl="~/images/File.png"  runat="server" />
                                   </a>
                                      <a href="%3C%25#%20Eval(%22Prospectus_mention_File3%22)%25%3E" target="_blank" title="Prospectus mention Link">
                                   <asp:Image ID="Image2" ImageUrl="~/images/File.png"  runat="server" />
                                   </a>
                                      <a href="%3C%25#%20Eval(%22Prospectus_mention_File4%22)%25%3E" target="_blank" title="Prospectus mention Link">
                                   <asp:Image ID="Image3" ImageUrl="~/images/File.png"  runat="server" />
                                   </a>
                                      <a href="%3C%25#%20Eval(%22Prospectus_mention_File5%22)%25%3E" target="_blank" title="Prospectus mention Link">
                                   <asp:Image ID="Image4" ImageUrl="~/images/File.png"  runat="server" />
                                   </a>
                                  </div>

在页面代码后面 -

Behind page code--

public void Bind()
    {
        DCI_BAL1 objDCI_BAL = new DCI_BAL1();
        DataSet ds = new DataSet();
        string collegeId = Session["CollegeId"].ToString();
        objDCI_BAL.Qtype = "11";
        objDCI_BAL.CollegeId = collegeId;
        objDCI_BAL.UserId = UserID;
        ds = objDCI_BAL.BindData(objDCI_BAL);
        if (ds.Tables.Count > 0)
        {
            grdprof.DataSource = ds;
            grdprof.DataBind();
}

我的尝试：



以上是我的代码我想知道如何隐藏ImageUrl =〜/ images / File.png

当我获取列名的数据集为空时



所以请帮帮我

What I have tried:

above is my code i want to know how to hide ImageUrl="~/images/File.png"
when i Get dataset of column name is null

so please help me

推荐答案

试试

try

<asp:DataList ID="grdprof" runat="server" OnItemDataBound="grdprof_ItemDataBound">
          <ItemTemplate>
              <div>
                 <%# Eval("MyColumn") %>
                  <asp:Image ID="Image4"  ImageUrl="Images/File.png" runat="server" />
              </div>
          </ItemTemplate>
      </asp:DataList>

protected void Page_Load(object sender, EventArgs e)
       {
           if (!IsPostBack)
           {
               string strnull = null;
               DataTable dt = new DataTable();
               dt.Columns.Add("MyColumn");
               dt.Rows.Add("value");
               dt.Rows.Add(strnull);
               dt.Rows.Add("value 2");
               grdprof.DataSource = dt;
               grdprof.DataBind();
           }

       }




       protected void grdprof_ItemDataBound(object sender, DataListItemEventArgs e)
       {
           var row = e.Item.DataItem as DataRowView;
           string value = Convert.ToString( row["MyColumn"]);
           if (string.IsNullOrEmpty(value))
               (e.Item.FindControl("Image4") as Image).Visible = false;

       }

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