Sharepoint 自定义字段类型

Moss2007默认有许多常见类型，如:文本,日期，数字，选项… ,有时我们需要根据需求自定义一个类型!在WSS3.0中可以通过C#或者VB来编写扩展字段，所有的自动需要继承内置的Sharepoint类型(如：SPFieldText 和 SPFieldNumber)

字段类型构成

字段类型
字段值类(不必需)
字段展现部分(用户控件或者直接输出)
字段描述文件(必须以fldtypes_开头的文件)

Demo:

打开VS2008, 新建Sharepoint类型的“Empty＂工程＂CustomFieldsDemo＂，添加－－＞新项，选择　Field Control 类型，命名为: ＂ddlTree ＂ , 字段描述的XML文件也自动生成了!

打开: ddlTree.Field.cs ，把继承修改为　＂SPFieldChoice＂;

打开: ddlTree.FieldControl.cs , 把继承修改为＂BaseFieldControl＂; 按你字段的需求写逻辑代码!

using System;
using System.Data;
using System.Runtime.InteropServices;
using System.Web.UI.WebControls;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;


namespace CustomFieldsDemo
{
    [CLSCompliant(false)]
    [Guid("74e4f4fc-ccb6-4c75-aafd-5fb04153820e")]
    public class ddlTreeFieldControl : BaseFieldControl //TextField
    {
        protected DropDownList ddlTree;
        protected override string DefaultTemplateName
        {
            get
            {
                //下面的用户控件名,<SharePoint:RenderingTemplate> 控件的ID 需要等于这个值 
                return "ddlTreeFieldRendering";
            }
        }

        public override object Value
        {
            get
            {
                EnsureChildControls();
                return ddlTree.SelectedValue;
            }
            set
            {
                EnsureChildControls();
                ddlTree.SelectedValue = this.ItemFieldValue + "";
            }
        }
        public override void Focus()
        {

            EnsureChildControls();
            ddlTree.Focus();
        }
        protected override void CreateChildControls()
        {
            if (Field == null) return;
            base.CreateChildControls();
            if (ControlMode == SPControlMode.Display) return;
            //控件ID :ddlTree
            ddlTree = (DropDownList) TemplateContainer.FindControl("ddlTree");
            if (ddlTree == null)
                throw new ArgumentException("未找到ddlTree控件");
            ddlTree.ToolTip = Field.Title + "";
            ddlTree.TabIndex = TabIndex;
            ddlTree.CssClass = CssClass;
            if (!Page.IsPostBack)
                BindData();
            
        }
        //List Name : Tree 
        private string sourceTreeList = "Tree";
        private void BindData()
        {
            SPWeb web = SPControl.GetContextWeb(Context);
            SPList treeList = web.Lists[sourceTreeList];
            SPListItemCollection items = treeList.Items;

            ddlTree.Items.Add(new ListItem("设置为一级分类", "0"));
            DataTable dt = items.GetDataTable();
            if(dt.Rows.Count>0)
            {
                foreach (DataRow row in dt.Rows)
                {
                    if(row["ParentID"].ToString().Trim()=="0")
                    {
                        ddlTree.Items.Add(new ListItem(row["ClassName"] + "", row["ClassID"] + ""));
                        BindChildData(dt, row["ClassID"] + "", 1);
                    }
                }
            }
        }

        private void BindChildData(DataTable dt, string classID, int spaceLength)
        {
            DataRow[] rows = dt.Select("ParentID=" + classID, "ClassID");
            foreach (DataRow row in rows)
            {
                ddlTree.Items.Add(new ListItem(SpaceLength(spaceLength) + row["ClassName"] + "", row["ClassID"] + ""));
            }
        }

        private string SpaceLength(int spaceLength)
        {
            string space = "";
            for (int i = 0; i < spaceLength; i++)
            {
                space += " ";
            }
            return space + "┗";
        }
    }
}

新建一个字段类型的呈现控件(这里新建一个用户控件)

<%@ Control Language="C#" Debug="true" %>

<%@ Assembly Name="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>

<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> 

<SharePoint:RenderingTemplate ID="ddlTreeFieldRendering" runat="server">
    <Template>
        <asp:DropDownList ID="ddlTree" runat="server"></asp:DropDownList>
    </Template>
</SharePoint:RenderingTemplate>

文件保存为:ddlTreeFieldRendering.ascx , 这个文件名和 RenderingTemplate 控件的ID 名 和 DefaultTemplateName属性值一致!

fldtypes_ddlTree.xml 里面的内容

TypeName">下拉列表</Field>
    <Field Name="ParentType">Choice</Field>
    <Field Name="TypeDisplayName">这是一个下拉列表</Field>
    <Field Name="TypeShortDescription">直接多级的下拉列表</Field>
    <Field Name="UserCreatable">TRUE</Field>
    <Field Name="UserCreatable">TRUE</Field>
    <Field Name="ShowOnListAuthoringPages">TRUE</Field>
    <Field Name="ShowOnSurveyAuthoringPages">TRUE</Field>
    <Field Name="ShowOnDocumentLibraryAuthoringPages">TRUE</Field>
    <Field Name="ShowOnColumnTemplateAuthoringPages">TRUE</Field>

    <Field Name="FieldTypeClass">CustomFieldsDemo.ddlTreeField,CustomFieldsDemo,Version=1.0.0.0,Culture=neutral,PublicKeyToken=9f4da00116c38ec5</Field>
    
    <RenderPattern Name="DisplayPattern">
      <Switch>
        <Expr>
          <Column/>
        </Expr>
        <Case Value=""></Case>
        
        <Default>
          <Column SobColumnNumber="0" HTMLEncode="TRUE"/>
          <HTML>
            <![CDATA[<BR>]]>
          </HTML>
          <Column SobColumnNumber="1" HTMLEncode="TRUE"/>
          <HTML><![CDATA[&NBSP;-&NBSP;]]></HTML>
          
          <Column SobColumnNumber="2" HTMLEncode="TRUE"/>
          <HTML><![CDATA[<BR>]]></HTML>
        </Default>

      </Switch>
    </RenderPattern>
  </FieldType>

</FieldTypes>

打开你的站点，新建一个List 名为＂Tree ＂效果如下，因为上面代码需要获取Tree里面的数据,字段也要一样哦

部署，使用:

把＂ddlTreeFieldRendering.ascx＂文件复制到＂C:\Program Files\Common Files\microsoft shared\Web Server Extensions\12\TEMPLATE\CONTROLTEMPLATES＂　;
把 fldtypes_ddlTree.xml 文件复制到 C:\Program Files\Common Files\microsoft shared\Web Server Extensions\12\TEMPLATE\XML
把工程的程序集注册到 GAC 并重启IIS! 可使用vs Tools里面的 gacutil -if d:dll.dll 注册到GAC ， iisreset 重启IIS

最后效果图:

参考书籍: SharePoint Server 2007 案例开发实战杨永刚著

自定义字段类型