在带有模板的数据列表中，我有3个标签要存储（名字，剪贴簿，发布时间），图像存储配置文件图片以及另外一个图像控件用于存储图像，用户将图像作为剪贴图发布。现在我希望这个图像控件仅在用户发布图像时可见，否则该行不可见。
代码是
protected void postscrap_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection();
con.ConnectionString=ConnectionStrings["Con"].ConnectionString;
con.Open();
DataTable dt2 = new DataTable();
if (con.State == ConnectionState.Open)
{
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "Insert into Scraps(Emailscrapto,scrap,posttime) Values('" + Session["UserName"].ToString() + "','" + TextBox2.Text.ToString() + "','" + DateTime.Now.ToString() + "')";
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.ExecuteNonQuery();
Response.Redirect("UserHome.aspx");
TextBox2.Text = "";
SqlDataAdapter d1 = new SqlDataAdapter(" Select * from Login l Inner join Scraps s on l.Email = s.Email Where l.Email = '" + Session["UserName"] + "'", con);
d1.Fill(dt2);
DataList1.DataSource = dt2;
DataList1.DataBind();
con.Close();
}
if (dt2.Rows.Count > 0)
{
TextBox2.Text = "";
}
protected void postimg_Click(object sender, EventArgs e)
{
string ToSaveImageName;
string sImageFileExtension;
if (FileUpload1.PostedFile != null)
{
//Image postedimage = e.FindControl("postedimage");
//postedimage.Visible = true;
string myMap = MapPath("~/").ToLower();
Random r = new Random();
int next = r.Next();
string ImageName = FileUpload1.PostedFile.FileName;
sImageFileExtension = ImageName.Substring(ImageName.LastIndexOf(".")).ToLower();
SqlConnection con = new SqlConnection();
con.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["Con"].ConnectionString;
con.Open();
DataTable dt2 = new DataTable();
if (con.State == ConnectionState.Open)
{
SqlCommand cmd = new SqlCommand();
if (sImageFileExtension == ".gif" || sImageFileExtension == ".png" || sImageFileExtension == ".jpg" || sImageFileExtension == ".jpeg" || sImageFileExtension == ".bmp")
{
string ImageSaveURL = myMap + "Postedimages/"+next+sImageFileExtension;
FileUpload1.PostedFile.SaveAs(ImageSaveURL);
cmd.CommandText = "Insert into Scraps(Emailscrapto,scrap,posttime) Values('" + Session["UserName"].ToString() + "','" + next + sImageFileExtension + "','" + DateTime.Now.ToString() + "')";
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.ExecuteNonQuery();
Response.Redirect("UserHome.aspx");
}
}
}
}
protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{ if (FileUpload1.HasFile != null)
{
Image postedimage = (Image)e.Item.FindControl("postedimage");
postedimage.Visible = true;
}
}
}
设计源是这样的
<asp:DataList ID="DataList1" runat="server" CellPadding="4" Font-Bold="True" Font- Italic="False"
Font-Names="Verdana" Font-Overline="False" Font-Size="Medium" Font-Strikeout="False"
Font-Underline="False" ForeColor="#333333" OnSelectedIndexChanged="DataList1_SelectedIndexChanged"
Height="1592px" RepeatLayout="Flow" DataSourceID="SqlDataSource1" OnItemCommand="DataList1_ItemCommand"
OnEditCommand="DataList1_EditCommand" OnItemDataBound="DataList1_ItemDataBound">
<AlternatingItemStyle BackColor="White" />
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<FooterTemplate>
<asp:TextBox ID="txtcomment" runat="server" Height="29px" Width="188px"></asp:TextBox>
<br />
<br />
<asp:Button ID="Insert" runat="server" Text="Insert" OnClick="Insert_Click" />
</FooterTemplate>
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<ItemStyle BackColor="#FFFBD6" ForeColor="#333333" />
<ItemTemplate>
<table class="style8">
<tr>
<td bgcolor="#FFFF99" class="style12">
<asp:Label ID="Label4" runat="server" Text='<%# Eval("FirstName") %>' Font-Bold="True"
Font-Italic="True" ForeColor="Red"></asp:Label>
</td>
<td bgcolor="#FFFF99" class="style11">
<asp:Image ID="Image3" runat="server" Height="108px" ImageUrl='<%# "~/UserImage/" +Eval("profile_pic") %>'
Width="98px" />
</td>
</tr>
<tr>
<td colspan="2" bgcolor="#CCFF99">
<asp:Label ID="Label5" runat="server" Text='<%# Eval("scrap") %>' ForeColor="#000066"></asp:Label>
</td>
</tr>
<tr>
<td bgcolor="#CCFF99" colspan="2">
<asp:Image ID="postedimage" runat="server" Height="202px" ImageUrl='<%# "~/Postedimages/" +Eval("scrap") %>'
Visible="False" Width="262px" />
</td>
</tr>
<tr>
<td class="style13" bgcolor="#FFC1B3">
<asp:LinkButton ID="Edit" runat="server" CommandName="Edit">Edit</asp:LinkButton>
</td>
<td bgcolor="#FFC1B3">
</td>
</tr>
<tr>
<td bgcolor="#CABAF8" class="style13" colspan="2">
</td>
</tr>
</table>
</ItemTemplate>
<EditItemTemplate>
<table class="style14">
<tr>
<td bgcolor="#E3ACC8">
<asp:LinkButton ID="cmnt2" runat="server" CommandName="Comment">Comment</asp:LinkButton>
<asp:LinkButton ID="cancel" runat="server" CommandName="Cancel">Cancel</asp:LinkButton>
</td>
</tr>
<tr>
<td bgcolor="#CCFFFF">
<asp:TextBox ID="TextBox3" runat="server" BorderColor="#003300" BorderStyle="Inset"
Height="30px" Width="486px"></asp:TextBox>
</td>
</tr>
</table>
<br />
</EditItemTemplate>
<SelectedItemStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<SeparatorStyle BackColor="Yellow" Font-Bold="False" Font-Italic="False" Font-Overline="False"
Font-Size="Small" Font-Strikeout="False" Font-Underline="False" ForeColor="Maroon"
HorizontalAlign="Center" />
</asp:DataList>
最初，我创建了pastimage.visible = false的值; 但是由于上面的编码，出现了空白图像行。
答案 0 :(得分：0)
您可以根据数据中的值设置tr的可见性，但您需要将其转换为服务器控件。我假设如果没有图像集，scrap是一个空字符串。
<tr runat="server" visible='<%# Eval("scrap") != "" %>'>
<td bgcolor="#CCFF99" colspan="2">
<asp:Image ID="postedimage" runat="server" Height="202px" ImageUrl='<%# "~/Postedimages/" +Eval("scrap") %>'
Visible="False" Width="262px" />
</td>
</tr>