WebPart 代码开发

假定你是使用WebPart Library进行开发的。

（一）定义Toolbox data

设置类的属性值。在类声明前加上对该类的属性设置。

[ToolboxData("<{0}:WebPart1 runat=server></{0}:WebPart1>")]    // 注意其中Target的定义与类名相同

public class WebPart1 : Microsoft.SharePoint.WebPartPages.WebPart{

…

}

（二）定义XML namespace

如果想成功导入用户自定义WebPart，你必须为每一个WebPart设置XML namespace属性。这个动作是在Web Part Class 定义的时候完成的。

[XmlRoot(Namespace="MyWebParts")]

（三）逻辑实现

//--------------------------------------------------------------------

// File: SimpleWebPart.cs

//

// Purpose: A sample Web Part that demonstrates how to create a basic

// Web Part.

//--------------------------------------------------------------------

using System;

using System.ComponentModel;

using System.Runtime.InteropServices;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Xml.Serialization;

using Microsoft.SharePoint;

using Microsoft.SharePoint.WebPartPages;

using Microsoft.SharePoint.Utilities;

using System.Web.UI.HtmlControls;

namespace MyWebParts

{

    ///<summary>

    /// This Web Part changes it's own title and implements a custom property.

    ///</summary>

    [XmlRoot(Namespace="MyWebParts")]   

    public class SimpleWebPart : WebPart

    {

        private const string defaultText = "hello";

        private string text=defaultText;

        // Declare variables for HtmlControls user interface elements.

        HtmlButton _mybutton;

        HtmlInputText _mytextbox;

        // Event handler for _mybutton control that sets the

        // Title property to the value in _mytextbox control.

        public void _mybutton_click (object sender, EventArgs e)

        {

            this.Title = _mytextbox.Value;

            try

            {

                this.SaveProperties=true;

            }

            catch

            {

                Caption = "Error... Could not save property.";

            }

        }

        // Override the ASP.NET Web.UI.Controls.CreateChildControls

        // method to create the objects for the Web Part's controls.     

        protected override void CreateChildControls ()

        {        

            // Create _mytextbox control.

            _mytextbox = new HtmlInputText();

            _mytextbox.Value="";

            Controls.Add(_mytextbox);

            // Create _mybutton control and wire its event handler.

            _mybutton = new HtmlButton();

            _mybutton.InnerText = "Set Web Part Title";

            _mybutton.ServerClick += new EventHandler (_mybutton_click);

            Controls.Add (_mybutton);

        }

        [Browsable(true),Category("Miscellaneous"),

        DefaultValue(defaultText),

        WebPartStorage(Storage.Personal),

        FriendlyName("Text"),Description("Text Property")]

        public string Text

        {

            get

            {

                return text;

            }

            set

            {

                text = value;

            }

        }

       

        protected override void RenderWebPart(HtmlTextWriter output)

        {

            RenderChildren(output);

            // Securely write out HTML

            output.Write("<BR>Text Property: " + SPEncode.HtmlEncode(Text));   

        }

    }

}

注意：默认情况下，信认级别设置成WSS_Minimal，它不能访问SharePoint object model。为了能设置 SaveProperties 属性，你必须执行下面三个动作。

       a) Create a custom policy file for your assembly.

       b) Install your assembly in the global assembly cache.

       c) Increase the trust level for the entire virtual server.