继承并自定制SharePoint中的Content Query Web Part (CQWP)

1：CQWP 是什么， 作用是什么

2：将Site 以及 Site Collection 的Publishing Feature 打开才能看到

3：在页面中应用sharepoint自带的content query web part，之后Edit 其中的Query以及Filter 条件，然后Apply查看结果

4：将含有Query 和 Filter 条件的WebPart 导出，会得到webpart此时的所有 property

5：在VS中添加自己的 Visual WebPart 让其继承CQWP， 然后将导出来的Property 添加到对应的 .WebPart 文件中（这样完成了属性的自定义）

6：之后根据 ItemStyle.xsl 完全自定义一份自己的ItemStyle.xsl（后续简称 MyItemStyle）

7：property中的ItemXslLink 制定我们用哪个ItemStyle文件，再次填写默认值，指定到我们的 MyItemStyle

8：在MyItemStyle可以自定义css，也可以自定制那些元素可以显示在页面上 （这样完成了ItemStyle的自定义）

9：在VS中创建一个Module然后将 MyItemStyle 部署到SharePoint中指定位置【注：可以将MyItemStyle的Build action 设置为none，以保证build通过】

10：9要依赖于我们Feature的部署，在Feature中将9中的Module加上

11：还可以 Custom Toolpart properties for CQWP【注意properties的持久化问题】

如下代码：

EricSunArticlesQueryWebPart.cs :

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.Publishing.WebControls;
using Microsoft.SharePoint.WebPartPages;
using System.Collections.Generic;

namespace EricSunSharePointProject.WebParts.EricSunArticlesQueryWebPart
{
    [ToolboxItemAttribute(false)]
    public class EricSunArticlesQueryWebPart : ContentByQueryWebPart
    {
        private string articleCategory = string.Empty;

        [WebBrowsable(true),
         Personalizable(PersonalizationScope.Shared),
         WebPartStorage(Storage.Personal),
         WebDisplayName("User Category Field"),
         WebDescription("Enter the Category name which the CQWP will filter on"),
         SPWebCategoryName("CategoryConfigureQuery")]
        public string ArticleCategory
        {
            get
            {
                return articleCategory;
            }
            set
            {
                articleCategory = value;
            }
        }

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
        }

        protected override void CreateChildControls()
        {
            base.CreateChildControls();
        }

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

        public override ToolPart[] GetToolParts()
        {
            List<ToolPart> _toolParts = new List<ToolPart>(base.GetToolParts());
            _toolParts.Insert(0, new EricSunExtendedCQWPToolPart(ArticleCategory));
            return _toolParts.ToArray();
        }

        /// <summary>
        /// Change web part properties

        /// </summary>
        public void ApplyChanges()
        {
            this.Title = string.Format("{0}", ArticleCategory);
            this.TitleUrl = "/Pages/CategoryLanding.aspx?Title=" + this.Title;
            this.FilterOperator1 = FilterFieldQueryOperator.Contains;
            this.FilterDisplayValue1 = ArticleCategory;
            this.FilterValue1 = ArticleCategory;
            this.FilterField1 = "EricSunCategoryString";
        }

        protected override void Render(HtmlTextWriter writer)
        {
            string articlesCount = string.Empty;
            if (!string.IsNullOrEmpty(ArticleCategory))
            {
                articlesCount = " ( " + GetArticlesCount(ArticleCategory).ToString() + " ) ";
                writer.Write("<div><a href=/Pages/CategoryLanding.aspx?Title=" + HttpUtility.UrlPathEncode(ArticleCategory) + ">" + ArticleCategory + "</a><span style=\"font-family:Arial; font-size:18px; font-weight:normal; color:#666666\">" + articlesCount + "</span></div>");
            }
            base.Render(writer);
        }

        /// <summary>
        /// Get articles count
        /// </summary>
        /// <returns></returns>
        private int GetArticlesCount(string category)
        {
            int articlesCount = 0;
            SPSite currentSite = null;
            SPWeb currentWeb = null;
            try
            {
                if (!string.IsNullOrEmpty(category))
                {
                    currentSite = SPContext.Current.Site;
                    currentWeb = currentSite.RootWeb;
                    SPList articlesList = currentWeb.GetList("/Lists/EricSunArticlesList");
                    for (int i = 0; i < articlesList.ItemCount; i++)
                    {
                        if (articlesList.Items[i]["EricSunCategoryString"].ToString().Contains(category) && articlesList.Items[i]["EricSunStatus"].ToString().Equals("Published", StringComparison.OrdinalIgnoreCase))
                        {
                            articlesCount++;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
            }
            return articlesCount;
        }
    }
}

EricSunExtendedCQWPToolPart .cs

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebPartPages;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI.WebControls;

namespace EricSunSharePointProject.WebParts.EricSunArticlesQueryWebPart
{
    public class EricSunExtendedCQWPToolPart : ToolPart
    {
        public Literal Ltrl { get; set; }
        public DropDownList CategoryDdl { get; set; }

        public EricSunExtendedCQWPToolPart(string _ddlValue)
        {
            List<string> categories = GetArticleCategoryNames();
            CategoryDdl = new DropDownList();
            CategoryDdl.Items.Add(new ListItem("Select a category for the web part", ""));
            foreach (string category in categories)
            {
                CategoryDdl.Items.Add(new ListItem(category, category));
            }

            if (!string.IsNullOrEmpty(_ddlValue))
            {
                CategoryDdl.SelectedValue = _ddlValue;
            }
        }

        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            this.Title = "Extended Settings";

            Ltrl = new Literal();
            Ltrl.Text = "<b>Category Selection</b><br/>";

            this.Controls.Add(Ltrl);
            this.Controls.Add(CategoryDdl);

        }

        /// <summary>
        /// Apply Changes
        /// </summary>
        public override void ApplyChanges()
        {
            EricSunArticlesQueryWebPart _parentWebPart = (EricSunArticlesQueryWebPart)this.ParentToolPane.SelectedWebPart;
            if (_parentWebPart != null && CategoryDdl.SelectedIndex > 0)
            {
                _parentWebPart.ArticleCategory = CategoryDdl.SelectedValue;

                _parentWebPart.ApplyChanges();
            }
            base.ApplyChanges();
        }

        /// <summary>
        /// Get article category names
        /// </summary>
        /// <returns></returns>
        private List<string> GetArticleCategoryNames()
        {
            List<string> categoryNameList = new List<string>();
            SPSite currentSite = null;
            SPWeb currentWeb = null;
            try
            {
                currentSite = SPContext.Current.Site;
                currentWeb = currentSite.RootWeb;
                SPList categoryList = currentWeb.GetList("/Lists/EricSunCategoriesList");
                for (int i = 0; i < categoryList.ItemCount; i++)
                {
                    categoryNameList.Add(categoryList.Items[i].Name);
                }
            }
            catch (Exception ex)
            {
            }
            return categoryNameList;
        }
    }
}

Elements.xml

<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/" >
  <Module Name="EricSunArticlesQueryWebPart" List="113" Url="_catalogs/wp">
    <File Path="EricSunArticlesQueryWebPart\EricSunArticlesQueryWebPart.webpart" Url="EricSunSharePointProject_EricSunArticlesQueryWebPart.webpart" Type="GhostableInLibrary">
      <Property Name="Group" Value="Custom" />
    </File>
  </Module>
</Elements>

EricSunArticlesQueryWebPart.webpart

<?xml version="1.0" encoding="utf-8"?>
<webParts>
  <webPart xmlns="http://schemas.microsoft.com/WebPart/v3">
    <metaData>
      <type name="EricSunSharePointProject.WebParts.EricSunArticlesQueryWebPart.EricSunArticlesQueryWebPart, $SharePoint.Project.AssemblyFullName$" />
      <importErrorMessage>$Resources:core,ImportErrorMessage;</importErrorMessage>
    </metaData>
    <data>
      <properties>
        <property name="Title" type="string">EricSun Articles Query WebPart</property>
        <property name="Description" type="string">My Web Part</property>
      </properties>
    </data>
  </webPart>
</webParts>

非常感谢如下文章的支持：

http://sharepoint-snippets.com/using-content-query-web-part-cqwp/

http://blog.csdn.net/crazysharepoint/article/details/6183541

http://blog.csdn.net/crazysharepoint/article/details/6308669

https://maulikdhorajia.blogspot.com/2012/01/sharepoint-custom-toolpart-properties.html

http://msdn.microsoft.com/en-us/library/aa981241.aspx **********

http://sharepoint.infoyen.com/2012/03/14/custom-content-query-webpart/