SharePoint 2007图文开发教程(4) 实现高级的WebPart

前面的文章中，我们编写了一个非常简单的WebPart，只是在网页中输出一段字符串。在实际的应用中没有什么作用。此文和大家分享如何开发高级的WebPart，为控件添加事件，实现有复合控件的WebPart等，使我们的WebPart更佳实用。

如果大家有开发服务器控件的基础，此文对你来说没有什么难度。想了解相关内容，参看我的《 ASP.NET的服务器控件开发》系列。废话不多说，直接进入今天的主题。

Demo 1

第一个例子也很简单，点击一个按钮，显示当前系统时间。如何创建WebPart就不细说了，不清楚的朋友可以参看《 SharePoint 2007图文开发教程(3)---实现简单的WebPart》。

直接看代码：

C# Code 复制内容到剪贴板

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml.Serialization;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;

namespace GetNow
{
    [Guid("0708695c-869c-4e8f-a6e9-cfcf148f404c")]
    public class GetNow : System.Web.UI.WebControls.WebParts.WebPart, INamingContainer
    {
        private string _text;
        private HtmlTableCell _tablecell = new HtmlTableCell();
        private Label lb = new Label();
        private Button btn = new Button();

        [WebBrowsable(true), Personalizable(true)]
        public string Text
        {
            get { return _text; }
            set { _text = value; }
        }
        public GetNow()
        {
            this.btn.Click += new EventHandler(btn_Click);
            this.ExportMode = WebPartExportMode.All;
        }
        ///
        /// 重写OnLoad
        ///
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            if (this.Page.IsPostBack == true)
            {
                this.AddControls();
            }
        }
        ///
        /// 重写CreateChildControls
        ///
        protected override void CreateChildControls()
        {
            this.Controls.Add(new LiteralControl("" + "\n"));               this.Controls.Add(new LiteralControl("    " + "\n"));               this.Controls.Add(this._tablecell);                this.Controls.Add(new LiteralControl("    " + "\n"));               this.Controls.Add(new LiteralControl("  
      
     
      
    " + "\n"));

            if (this.Page.IsPostBack == false)
            {
                this.AddControls();
            }
        }
        ///
        /// click处理函数
        ///
        void btn_Click(object sender, EventArgs e)
        {
            this._text = DateTime.Now.ToString();
            this._tablecell.InnerHtml = "";
            this.AddControls();
        }
        ///
        /// 重写Render
        ///
        protected override void Render(HtmlTextWriter writer)
        {
            base.Render(writer);
        }

        private void AddControls()
        {
            this.lb.ID = this.ID + "Label";
            this.lb.Text = this._text;
            this._tablecell.Controls.Add(this.lb);
            this._tablecell.Controls.Add(new LiteralControl(""));
            this.btn.ID = this.ID + "Button";
            this.btn.Text = "获取当前时间:";
            this._tablecell.Controls.Add(this.btn);
        }
    }
}

按照上文的部署方法，将GetNow的WebPart添加到SharePoint网站中：测试一下，获取时间成功！



Demo 2

第二个例子我们来实现WebPart的联动控制，也就是说通过一个WebPart来控制另外一个WebPart。还是直接看代码：

C# Code 复制内容到剪贴板

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;
using System.Collections;
using System.Drawing;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
using GetNow;

namespace SetColor
{
    [Guid("803617a2-9dc9-4eb8-b05c-3e064bc16642")]
    public class SetColor : System.Web.UI.WebControls.WebParts.WebPart, IPostBackEventHandler
    {
        private IList _colorlist = new ArrayList();
        private HtmlTableCell _TableCell = new HtmlTableCell();

        public SetColor()
        {
            this.GetItems();

            this.ExportMode = WebPartExportMode.All;
        }

        private void GetItems()
        {
            this._colorlist.Add("红色");
            this._colorlist.Add("黄色");
            this._colorlist.Add("蓝色");
            this._colorlist.Add("绿色");
            this._colorlist.Add("紫色");
        }

        private void AddRows()
        {
            for (int i = 0; i < _colorlist.Count; i++)
            {
                this._TableCell.Controls.Add(new LiteralControl("" + "\n"));                   this._TableCell.Controls.Add(new LiteralControl("    " + "\n"));                   this._TableCell.Controls.Add(new LiteralControl("         + this.Page.ClientScript.GetPostBackEventReference(this, this._colorlist[i].ToString()) + "\">" + this._colorlist[i].ToString() + "" + "\n"));                    this._TableCell.Controls.Add(new LiteralControl("    " + "\n"));                   this._TableCell.Controls.Add(new LiteralControl("  
      
     
      
    " + "\n"));
            }
        }

        protected override void CreateChildControls()
        {
            this.Controls.Add(new LiteralControl("" + "\n"));               this.Controls.Add(new LiteralControl("    " + "\n"));               this.Controls.Add(this._TableCell);                this.Controls.Add(new LiteralControl("    " + "\n"));               this.Controls.Add(new LiteralControl("  
      
     
      
    " + "\n"));

            if (this.Page.IsPostBack == false)
            {
                this.AddRows();
            }
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            if (this.Page.IsPostBack == true)
            {
                this.AddRows();
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            base.Render(writer);
        }

        public void RaisePostBackEvent(string eventArgument)
        {

            for (int i = 0; i < WebPartManager.WebParts.Count; i++)
            {

                if (WebPartManager.WebParts[i].Title == "GetNow")
                {
                    GetNow.GetNow instance = (GetNow.GetNow)WebPartManager.WebParts[i];
                    switch (eventArgument)
                    {
                        case "红色":
                            instance.BackColor = Color.Red;
                            break;
                        case "黄色":
                            instance.BackColor = Color.Yellow;
                            break;
                        case "蓝色":
                            instance.BackColor = Color.Blue;
                            break;
                        case "绿色":
                            instance.BackColor = Color.Green;
                            break;
                        case "紫色":
                            instance.BackColor = Color.Purple;
                            break;
                        default:
                            break;
                    }
                }

            }
        }
    }
}

代码不是很难，创建一个WebPart，向其中添加一个List，提供用户几种颜色的选择情况，然后通过用户选择的情况改变我们上面GetNow这个WebPart的背景颜色。

按照前面的方法加到SharePoint网站中：

选择红色：

选择紫色：

 ok。我们想要的效果已经实现啦！

小结：上面只是自己抛砖引玉的小例子，希望对新手有帮助。对于WebPart的开发部分就介绍这些吧，望支持。有什么不得当的地方还望大家指教。根据自己的业务需要，大家可以开发出更实用的WebPart。还有建议大家多看看服务器控件开发的文章，会有帮助!