我有一个网格视图,其中一些行附有图片。当我按下 Button2 时,我从 sql 记录中提取信息,关于服务器上哪个文件夹有图片。这已经有效,但我无法让按钮仅在附加了图像文件夹的行中可见。
我用谷歌搜索了很长时间,发现了类似于以下的不同解决方案,但我无法让它工作。我究竟做错了什么?
<asp:SqlDataSource ID="SqlDSodinRSSfeb" runat="server"
ConnectionString="<%$ ConnectionStrings:herning_brand_dk_dbConnectionString %>"
SelectCommand="SELECT PubDateTime, Melding, Station, PhotoFolder FROM OdinRSS ">
</asp:SqlDataSource>
<asp:GridView ID="GridView14" runat="server" DataSourceID="SqlDSodinRSSfeb"
AutoGenerateColumns="False" Width="500px" OnRowCommand="Button_RowCommand" >
<Columns>
<asp:BoundField DataField="PubDateTime" HeaderText="Tidspunkt" />
<asp:BoundField DataField="Melding" HeaderText="Melding for udkaldet" />
<asp:BoundField DataField="Station" HeaderText="Station" />
<asp:TemplateField HeaderText="Foto" >
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("PhotoFolder") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Button ID="Button2" runat="server" Text="Foto" Visible='<%# Eval("PhotoFolder") != "Null" %>'
CommandName="ButtonClick" CommandArgument='<%# Eval("PhotoFolder") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
我的.cs
protected void Button_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandArgument != null)
{
switch (e.CommandName)
{
case "ButtonClick":
{
int Folder = Convert.ToInt32(e.CommandArgument);
PhotoList(Folder);
}
break;
}
}
}
void PhotoList(int FolderNumber)
{
var imagePaths = Directory.GetFiles(Server.MapPath("PhotoFolder\\" + FolderNumber));
var imageNames = new string[imagePaths.Length];
for (int i = 0; i < imagePaths.Length; i++)
{
imageNames[i] = imagePaths[i].Substring(imagePaths[i].LastIndexOf("\\") + 1);
}
var dt = new DataTable();
dt.Columns.Add("ImageName", typeof(string));
dt.Columns.Add("ImagePath", typeof(string));
foreach (var imgName in imageNames)
{
DataRow dr = dt.NewRow();
dr["ImageName"] = RemoveExtension(imgName);
dr["ImagePath"] = "PhotoFolder/" + FolderNumber + "/" + imgName;
dt.Rows.Add(dr);
}
DataList1.DataSource = dt;
DataList1.DataBind();
}
string RemoveExtension(string imgName)
{
return imgName
.Replace(".jpg", "")
.Replace(".png", "");
}
sql 字段“PhotoFolder”是一个 nvarchar(50)。如果有记录的照片,则该字段有一个 100 及以上的数字,表示包含照片的文件夹。如果没有照片记录,该字段包含“Null”
我也试过:
<asp:Button ID="Button2" runat="server" Text="Foto" Visible='<%# Eval("PhotoFolder").ToString() != "Null" %>'
但是该按钮显示在所有行中,而不仅仅是“PhotoFolder”中具有字符串(数字)的那些