如果数据库值为空，则隐藏GridView图像列

<asp:GridView ID="GridView1" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Image ID="Image1" runat="server" ImageUrl='<%# Eval("ImageURL") %>' Visible="true" />
            </ItemTemplate>
        </asp:TemplateField>
        <!-- 其他列 -->
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // 绑定数据源
        GridView1.DataSource = GetDataFromDatabase();
        GridView1.DataBind();

        // 遍历每一行
        foreach (GridViewRow row in GridView1.Rows)
        {
            // 检查数据库值是否为空
            if (string.IsNullOrEmpty(DataBinder.Eval(row.DataItem, "ImageURL").ToString()))
            {
                // 隐藏图像列
                Image image = (Image)row.FindControl("Image1");
                image.Visible = false;
            }
        }
    }
}