SharePoint GridView的使用，DataSource的实现

SharePoint GridView使用可以通过两种方式来使用：
1. 直接给SPGridVew的DataSource属性赋值一个DataTable, 之后调用BindData方法。缺点是只使用SPGridView来显示数据，而排序，分页，过滤和其他的功能都不可用。
2. 通过SPGridView的DataSourceId绑定一个DataSource控件，之后就可以通过这个DataSource控件实现SPGridView的排序，分页，过滤等功能。

关于SPGridView的菜单项，排序分页和过滤的实现可以参考：http://www.cnblogs.com/ericfine/archive/2008/10/22/1316431.html
http://blog.csdn.net/ericfine/archive/2008/10/23/3130387.aspx

然而我的实现方式并和他一样，在上面链接的文章当中，SPGridView的排序可以使用，过滤也只能过滤一个条件，同时还要一个缺点，如果要显示的数据有上千甚至上万条的数据时，SPGridView还是将全部的数据导入到DataTable中，结果却只显示其中的10（SPGridView的PageSize）条，这样不但速度效率会非常的慢。

如下是我的实现方式：使用Microsoft.SharePoint.WebControlsDataTableDataSourceView和System.Web.UI.DataSourceControl控件。
WebControlsDataTableDataSourceView是SharePoint实现的一个DataSourceView的派生类。它的主要方法有

IEnumerable Select(DataSourceSelectArguments selectArguments)

我就不多说了，贴代码给大家直接看吧：

页面：

<Mine:MyDataSource runat="server" ID="DataSource" ViewName="FilterJob" ></Mine:MyDataSource>
                        <SharePoint:SPGridView PagerSettings-Visible="true" AllowPaging="true" ID="ViewList" runat="server" AllowFiltering="true" FilteredDataSourcePropertyFormat="{1} = '{0}'" FilteredDataSourcePropertyName="FilterExpression"
                         FilterDataFields=",JobId,PlanName,StartTime,EndTime,Status,Progress" DataSourceID="DataSource" AutoGenerateColumns="False" AllowSorting="True" BorderStyle="None" CssClass="ms-listviewtable" GridLines="None"  Width="100%">    
                            <SelectedRowStyle CssClass="ms-selectednav" Font-Bold="True" />
                            <AlternatingRowStyle CssClass="ms-alternating" />
          </SharePoint:SPGridView>

由于为了实现国际化，Columns的添加在后台，我就不介绍了，上面的那两个链接。

自定义DataSource的实现：

 

[ToolboxData("<{0}:MyDataSource runat=server></{0}:MyDataSource>")]
    public class MyDataSource : DataSourceControl
    {
        private ACDataSourceView mView;
        private string mViewName;
        private static string[] mViewNames = new string[] { "FrontEnd", "ScanJob", "ScanReport", "FilterJob", "FilterReport", "ManualScan", "ContentFilter", "RealTimeReport" ,"Test"};

        // Methods
        protected virtual ACDataSourceView CreateView()
        {
            int num = -1;
            if (!String.IsNullOrEmpty(this.ViewName) && (num = GetViewNumber()) != -1)
            {
                switch (num)
                {
                    case 0:
                        return new ACFrontEndDataSourceView(this, this.ViewName, this.Context);
                    case 1:
                        return new ACJobDataSourceView(this, this.ViewName, this.Context);
                    case 2:
                        return new ACScanReportDataSourceView(this, this.ViewName, this.Context);
                    case 3:
                        return new ACJobDataSourceView(this, this.ViewName, this.Context, true);
                    case 4:
                        return new ACFilterReportDataSourceView(this, this.ViewName, this.Context);
                    case 5:
                        return new ACPlanListView(this, this.ViewName, this.Context, false);
                    case 6:
                        return new ACPlanListView(this, this.ViewName, this.Context, true);
                    case 7:
                        return new ACScanReportDataSourceView(this, this.ViewName, this.Context);
                    case 8:
                        return new ACTestDataSourceView(this, this.ViewName, this.Context);
                    default:
                        break;
                }
            }
            return null;
        }

        private int GetViewNumber()
        {
            for (int i = 0; i < mViewNames.Length; i++)
            {
                if (mViewNames[i] == mViewName)
                {
                    return i;
                }
            }
            return -1;
        }

        protected override DataSourceView GetView(string viewName)
        {
            return this.View;
        }

        protected override ICollection GetViewNames()
        {
            return mViewNames;
        }

        private void LoadCompleteEventHandler(object sender, EventArgs e)
        {
            this.SelectParameters.UpdateValues(this.Context, this);
        }

        protected override void LoadViewState(object savedState)
        {
            Pair pair = (Pair)savedState;
            if (savedState != null)
            {
                base.LoadViewState(pair.First);
                if (pair.Second != null)
                {
                    this.View.LoadViewState(pair.Second);
                }
            }
            else
            {
                base.LoadViewState(null);
            }
        }

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            this.Page.LoadComplete += new EventHandler(this.LoadCompleteEventHandler);
        }

        protected override object SaveViewState()
        {
            Pair pair = new Pair();
            pair.First = base.SaveViewState();
            if (this.mView != null)
            {
                pair.Second = this.mView.SaveViewState();
            }
            if (pair.First != null)
            {
                return pair;
            }
            if (pair.Second != null)
            {
                return pair;
            }
            return null;
        }

        protected override void TrackViewState()
        {
            base.TrackViewState();
            if (this.mView != null)
            {
                this.mView.TrackViewState();
            }
        }

        // Properties
        [MergableProperty(false), DefaultValue((string)null), PersistenceMode(PersistenceMode.InnerProperty)]
        public ParameterCollection SelectParameters
        {
            get
            {
                return this.View.SelectParameters;
            }
        }

        protected ACDataSourceView View
        {
            get
            {
                if (this.mView == null)
                {
                    this.mView = this.CreateView();
                    if (base.IsTrackingViewState)
                    {
                        this.mView.TrackViewState();
                    }
                }
                return this.mView;
            }
        }

        public string ViewName
        {
            get
            {
                return this.mViewName;
            }
            set
            {
                mViewName = value;
            }
        }

        public string FilterExpression
        {
            get
            {
                return this.View.FilterExpression;
            }
            set
            {
                this.View.FilterExpression = value;
            }
        }

        public bool IsFilter
        {
            get
            {
                return this.View.IsFilter;
            }
            set
            {
                this.View.IsFilter = value;
            }
        }

 DataSourceView的实现在后面的文章再介绍。