DataList,PageDataSource打造简单的相册

我们一般可以使用 PageDataSource类来对Repeter,DataList等控件进行分页。我们同样也可以利用它来打造一个支持分页的简单的相册。

这个是页面源码，显示图片：

    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div align="center">
            <asp:DataList ID="MainAlbum" runat="server" BackColor="#CCCCCC" BorderColor="#999999"
                BorderStyle="Solid" BorderWidth="3px" CellPadding="4" CellSpacing="2" ForeColor="Black"
                GridLines="Both" RepeatColumns="4" RepeatDirection="Horizontal">
                <FooterStyle BackColor="#CCCCCC" />
                <SelectedItemStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
                <ItemStyle BackColor="White" />
                <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
                <ItemTemplate>
                <div>
                     <a href='<%#"Photos/"+Eval("Name") %>' target="_blank" />
                    <asp:Image ID="Image1" runat="server" width="200" Height="160" ImageUrl='<%#"Photos/"+Eval("Name") %>' />
                </div>                         
               </ItemTemplate>
            </asp:DataList></div>
            <div align="center">
                <asp:Label ID="lblPageCount" runat="server"></asp:Label>
                <asp:Label ID="lblCount" runat="server"></asp:Label>
                <asp:LinkButton ID="lbtnPreview" runat="server" Text="上一页" OnClick="lbtnPreview_Click"></asp:LinkButton>
                <asp:LinkButton ID="lbtnNext" runat="server" Text="下一页" OnClick="lbtnNext_Click"></asp:LinkButton>
            </div>
    </form>

 

显示图片的后台代码：

    protected void Page_Load(object sender, EventArgs e)
    ...{
        if (!IsPostBack)
        ...{
            lblCount.Text = "1";
            BindPhotos();
        }
    }

    private void BindPhotos()
    ...{
        //图片路径
        string ImagePath = Server.MapPath("~/Photos/");
        DirectoryInfo ImageFile = new DirectoryInfo(ImagePath);
        //得到目录下的所有图片
        FileInfo[] FileArray = ImageFile.GetFiles("*.jpg");

        DataTable dtPhoto = new DataTable("Album");

        DataColumn colSmall = new DataColumn("Name");
        DataColumn colNormal = new DataColumn("Photo");

        dtPhoto.Columns.Add(colSmall);
        dtPhoto.Columns.Add(colNormal);
        //将图片存入tabele中
         for (int i = 0; i < (FileArray.Length); i++)
         ...{
             DataRow Row = dtPhoto.NewRow();
             Row["Name"] = FileArray[i].Name;
             Row["Photo"] = "./Photos/" + FileArray[i].Name;
             dtPhoto.Rows.Add(Row);
         }
        //这里就是分页的代码
        PagedDataSource Source = new PagedDataSource();
        Source.AllowPaging = true;
        Source.DataSource = dtPhoto.DefaultView;
        Source.PageSize = 12;
        int CurrentPage = Convert.ToInt32(lblCount.Text);
        Source.CurrentPageIndex = CurrentPage - 1;
        lbtnPreview.Enabled = true;
        lbtnNext.Enabled = true;

        if (CurrentPage == 1)
        ...{
            lbtnPreview.Enabled = false;
        }
        if (CurrentPage == Source.PageCount)
        ...{
            lbtnNext.Enabled = false;
        }
        lblPageCount.Text = "共"+Source.PageCount+"页，当前为";
        MainAlbum.DataSource = Source;
        //MainAlbum.DataSource = ImageFile.GetFiles("*.jpg");
        MainAlbum.DataBind();
        
    }

    //下一页
    protected void lbtnNext_Click(object sender, EventArgs e)
    ...{
        lblCount.Text = Convert.ToString(Convert.ToInt32(lblCount.Text) + 1);
        BindPhotos();
    }

    //上一页
    protected void lbtnPreview_Click(object sender, EventArgs e)
    ...{
        lblCount.Text = Convert.ToString(Convert.ToInt32(lblCount.Text) - 1);
        BindPhotos();
    }

 

批量上传的代码：

 

    protected void btnMultiple_Click(object sender, EventArgs e)
    ...{
        string FilePath = Server.MapPath("~/Photos/");
        HttpFileCollection UploadFile = Request.Files;
        if (FileUpload1.HasFile || FileUpload2.HasFile || FileUpload3.HasFile || FileUpload4.HasFile || FileUpload5.HasFile)
        ...{
            for (int i = 0; i < UploadFile.Count; i++)
            ...{
                HttpPostedFile PostFile = UploadFile[i];
                try
                ...{
                    if (PostFile.ContentLength > 0)
                    ...{
                        string FileNames = PostFile.FileName;
                        string SingleName = FileNames.Substring(FileNames.LastIndexOf("/") + 1);
                        PostFile.SaveAs(FilePath + SingleName);
                    }
                }
                catch (Exception ex)
                ...{
                    Assistant.AlertMessage(ex.Message, this);
                }
            }
            Response.Redirect("~/MainAlbum.aspx");
        }
        else
        ...{
            Assistant.AlertMessage("请输入要上传的文件", this);
        }
       
    }