顯示照片自定義控件

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using PhotoManage;

namespace PhotoControl

{

    [DefaultProperty("PhotoID")]

    [ToolboxData("<{0}:PhotoImage runat=server></{0}:PhotoImage>")]

    public class PhotoImage : WebControl

    {

        [Bindable(true)]

        [Category("Appearance")]

        [DefaultValue("")]

        [Localizable(true)]

        private string _PhotoID;

        private string _NavigateUrl;

        private Targer _Target;

        private string _SqlConn;

        private string _ToolTip;

        private string _NOPhotoUrl;

        /// <summary>

        /// 資料庫連結字元串

        /// </summary>

        [Description("資料庫連結字元串"), Category("Appearance")]

        public string SqlConn

        {

            get

            {

                return _SqlConn;

            }

            set

                _SqlConn = value;

        }

        /// 要顯示的照片ID

        [Description("要顯示的照片ID"), Category("Appearance")]

        public string PhotoID

                return _PhotoID;

                _PhotoID = value;

        /// 連結位址

        [Description("連結位址"), Category("Appearance")]

        public string NavigateUrl

                return ((_NavigateUrl == null) ? String.Empty : _NavigateUrl);

                _NavigateUrl = value;

        /// 連結打開方式

        [Description("連結打開方式"), Category("Appearance")]

        //[DefaultValue("_blank")]

        public Targer Target

                return _Target;

                _Target = value;

        /// 将滑鼠移到控件上時顯示的工具提示。

        [Description("将滑鼠移到控件上時顯示的工具提示。"), Category("Appearance")]

        public string ToolTip

                return ((_ToolTip == null) ? String.Empty : _ToolTip);

                _ToolTip = value;

        /// 無照片時使用的替換圖檔

        [Description("無照片時使用的替換圖檔"), Category("Appearance")]

        public string NOPhotoUrl

                return ((_NOPhotoUrl == null) ? String.Empty : _NOPhotoUrl);

                _NOPhotoUrl = value;

        protected override void RenderContents(HtmlTextWriter output)

            string outStr = "";

            if (this.PhotoID != null && this.PhotoID != "" && this.SqlConn != null && this.SqlConn != "")

                PhotoDetail pDetail = new PhotoManage.PhotoDB(this.SqlConn).getPhotoDetail(this.PhotoID);

                if (pDetail != null)

                {

                    string tar = "";

                    switch (this.Target)

                    {

                        case Targer._blank: tar = "_blank"; break;

                        case Targer._parent: tar = "_parent"; break;

                        case Targer._search: tar = "_search"; break;

                        case Targer._self: tar = "_self"; break;

                        case Targer._top: tar = "_top"; break;

                    }

                    if (this.NavigateUrl == null || this.NavigateUrl == string.Empty)

                        this.NavigateUrl = pDetail.PhotoPath;                   

                    if (this.Height.IsEmpty != true && this.Width.IsEmpty != true)

                        outStr = "<a href=\"" + this.NavigateUrl + "\" target=\"" + tar + "\"><img border=\"0\" height=\"" + this.Height + "\" width=\"" + this.Width + "\" src=\"" + pDetail.SmallPhotoPath + "\" Alt=\"" + this.ToolTip + "\"/></a>";

                    else if (this.Height.IsEmpty == true && this.Width.IsEmpty == false)

                        outStr = "<a href=\"" + this.NavigateUrl + "\" target=\"" + tar + "\"><img border=\"0\" width=\"" + this.Width + "\" src=\"" + pDetail.SmallPhotoPath + "\" Alt=\"" + this.ToolTip + "\"/></a>";

                    else if (this.Height.IsEmpty == false && this.Width.IsEmpty == true)

                        outStr = "<a href=\"" + this.NavigateUrl + "\" target=\"" + tar + "\"><img border=\"0\" height=\"" + this.Height + "\" src=\"" + pDetail.SmallPhotoPath + "\" Alt=\"" + this.ToolTip + "\"/></a>";

                    else

                        outStr = "<a href=\"" + this.NavigateUrl + "\" target=\"" + tar + "\"><img border=\"0\" src=\"" + pDetail.SmallPhotoPath + "\" Alt=\"" + this.ToolTip + "\"/></a>";

                    output.Write(outStr);

                    return;

                }

                else

                    outStr = "<img border=\"0\" src=\"" + this.NOPhotoUrl + "\" alt=\"暫無照片\"";

            else

                outStr = "<img border=\"0\" alt=\"未提供屬性SqlConn或者屬性PhotoID\"";

                output.Write(outStr);

                return;

    }

   public enum Targer

        _blank = 0,

        _parent,

        _search,

        _self,

        _top

}