SharePoint(WSS)学习(2) 开发WebPart
WebPart可以看作是SharePoint的一种插件，是用来实现特定功能的组件。本篇开发一个非常简单的WebPart，了解一下其开发、部署。1.开发
新建项目，选择SharePoint的Webpa模板，项目名称为SimpleCalculator。
http://www.xianfen.net/Upload/img_big/2008111522094749.jpg
可以看到解决方案管理器里自动添加了Microsoft.SharePoint的引用；添加了*.snk,*.cs,*.webpart,*.xml等几个文件，我们将它改成友好的文件名称：
http://www.xianfen.net/Upload/img_big/200811152210149.jpg
实现SimpleCalculator：
using System;
using System.Runtime.InteropServices;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
namespace SimpleCalculator
{
public class Calculator : System.Web.UI.WebControls.WebParts.WebPart
{
TextBox txt1 = new TextBox();
DropDownList ddl1 = new DropDownList();
TextBox txt2 = new TextBox();
HtmlGenericControl lbl1 = new HtmlGenericControl("span");
TextBox txt3 = new TextBox();
Button btn1 = new Button();
HtmlGenericControl lbl2 = new HtmlGenericControl("span");
protected override void CreateChildControls()
{
txt2.Width = ddl1.Width = txt1.Width = 40;
ddl1.Items.Add("+");
ddl1.Items.Add("-");
ddl1.Items.Add("*");
ddl1.Items.Add("/");
lbl1.InnerHtml = "=";
btn1.Text = "Calculate";
btn1.Click += new EventHandler(btn1_Click);
lbl2.Style.Add("color", "red");
this.Controls.Add(txt1);
this.Controls.Add(ddl1);
this.Controls.Add(txt2);
this.Controls.Add(lbl1);
this.Controls.Add(lbl2);
this.Controls.Add(btn1);
}
void btn1_Click(object sender, EventArgs e)
{
try
{
double db1 = double.Parse(txt1.Text);
double db2 = double.Parse(txt2.Text);
double result = 0.0;
switch (ddl1.SelectedValue)
{
case "+":
result = db1 + db2;
break;
case "-":
result = db1 - db2;
break;
case "*":
result = db1 * db2;
break;
case "/":
result = db1 / db2;
break;
}
lbl2.InnerHtml = result.ToString("F2");
}
catch (Exception ex)
{
lbl2.InnerHtml = ex.Message;
}
}
}
}
Calculator文件中自动添加了以下SharePoint命名空间(在本例中不需要使用)
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages; 一个GUID，这是这个WebPart的唯一标志。 F5一键即可实现编译、部署。
在WebPart列表页面可以看到我们刚在部署的WebPart。
http://www.xianfen.net/Upload/img_big/200811152210466.jpg
退出编辑模式可以SimpleCalcuator能正确显示和运行，没有修饰的UI很不漂亮;-)
http://www.xianfen.net/Upload/img_big/2008111522110427.jpg
部署成功，那就看看自己的文件部署到哪去了呢？
http://www.xianfen.net/Upload/img_big/2008111522115419.jpg
http://www.xianfen.net/Upload/img_big/2008111522112191.jpg
可以看到，dll文件竟然部署到GAC里了，对于一个测试的程序来说，这不是我们想要的。
显示所有的文件，看到有个pkg文件夹，manifest.xml的DeploymentTarget设为WebApplication即可。
<?xml version="1.0" encoding="utf-8"?>
<Solution SolutionId="4658fa3d-5de4-4b46-85a8-5988cc6c977d" xmlns="http://schemas.microsoft.com/sharepoint/">
<FeatureManifests>
<FeatureManifest Location="Calculator\feature.xml" />
</FeatureManifests>
<Assemblies>
<Assembly Location="SimpleCalculator.dll" DeploymentTarget="WebApplication" />
</Assemblies>
</Solution>
修改后，dll文件在站点的bin目录，但再把该webpa添加到页面会出现以下错误：
Assemblies that implement ASP.NET Web Parts and are installed into a partially trusted location, such as the bin directory, must be compiled with the AllowPartiallyTrustedCallersAttribute set for import to succeed.
在程序集添加属性
，该方法位于System.Security命名空间中。
*.webpart文件中，Title属性为WebPart的名称，Description为WebPart的描述，上图显示的ToolTip就是描述的内容。
飘遥的BLOG：http://www.cnblogs.com/zxjay/
作者：飘遥(周振兴)
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