根據(jù)上面一篇隨筆所介紹的PC購買流程的項(xiàng)目，在項(xiàng)目中，需要有一個(gè)生成訂單的功能，能夠使得Admin很方便的在獲得批準(zhǔn)的申請(qǐng)中選取一些來生成訂單，要求界面操作簡(jiǎn)單明了，大概的效果圖如下：

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點(diǎn)擊checkbox，自動(dòng)計(jì)算當(dāng)前訂單的總價(jià)值，點(diǎn)擊按鈕，生成訂單。

有此想到了用SPGridView這個(gè)現(xiàn)成的控件來完成，以前也用過這個(gè)控件，其實(shí)和GridView沒什么大區(qū)別。這里就簡(jiǎn)單介紹一下了：

首先Create 一個(gè)WebPart

在CreateChildControls()中可以設(shè)置SPGridView 的數(shù)據(jù)源和屬性，添加Field等等。

但是CheckBox這一列，必須自己自定義一個(gè)模板類來生成，下面是我們自定義的CheckBox模板類，它實(shí)現(xiàn)了ITemplate接口:

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代碼

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????class?CheckBoxTemplateField:ITemplate
????{
????????string?id;
????????public?EventHandler?OnCheck?=?null;
????????public?CheckBoxTemplateField(string?chbId,?EventHandler?checkEvent)
????????{
????????????id?=?chbId;
????????????OnCheck?=?checkEvent;
????????}
????????
????????public?void?InstantiateIn(System.Web.UI.Control?container)
????????{
????????????CheckBox?chb?=?new?CheckBox();
????????????chb.AutoPostBack?=?true;
????????????chb.ID?=?id;
????????????chb.CheckedChanged?+=?OnCheck;
????????????container.Controls.Add(chb);
????????}
????}

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這樣就可以在SPGridView中調(diào)用這個(gè)模板類，并且為Oncheck事件提供處理方法：

代碼

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?????protected?override?void?CreateChildControls()
????????{
????????????if?(!_error)
????????????{
????????????????try
????????????????{
????????????????????SPList?sourceList?=?SPContext.Current.Web.Lists["Purchase?Request"];
????????????????????dataSource?=?new?SPDataSource();
????????????????????this.Controls.Add(dataSource);
????????????????????dataSource.List?=?sourceList;
????????????????????gridView?=?new?SPGridView();
????????????????????gridView.AutoGenerateColumns?=?false;

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????????????????????TemplateField?chbField?=?new?TemplateField();
????????????????????chbField.HeaderText?=?"";
????????????????????EventHandler?onCheck?=?new?EventHandler(OnCheck);
????????????????????chbField.ItemTemplate?=?new?CheckBoxTemplateField("chb",?onCheck);
????????????????????gridView.Columns.Add(chbField);

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當(dāng)我們提供了所以的Field綁定后，需要指定一列為Group列，我們這里指定了"Team"列:

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代碼

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????????????????????SPBoundField?createdField?=?CreateNewBoundField("Created",?"Created",?0);
????????????????????gridView.Columns.Add(createdField);

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????????????????????SPBoundField?applicantField?=?CreateNewBoundField("Created?By",?"Created?By",?0);
????????????????????gridView.Columns.Add(applicantField);

????????????????????SPBoundField?mtField?=?CreateNewBoundField("Machine?Type",?"Machine?Type",?0);
????????????????????gridView.Columns.Add(mtField);

????????????????????SPBoundField?compField?=?CreateNewBoundField("Component?Type",?"Component?Type",?0);
????????????????????gridView.Columns.Add(compField);

????????????????????SPBoundField?purNumField?=?CreateNewBoundField("Purchase?Number",?"Purchase?Number",?0);
????????????????????gridView.Columns.Add(purNumField);

????????????????????SPBoundField?purReasonField?=?CreateNewBoundField("Purchase?Reason",?"Purchase?Reason",?0);
????????????????????gridView.Columns.Add(purReasonField);

????????????????????SPBoundField?mgrAppField?=?CreateNewBoundField("Manager?Approval",?"Manager?Approval",?0);
????????????????????gridView.Columns.Add(mgrAppField);

????????????????????SPBoundField?drtAppField?=?CreateNewBoundField("Director?Approval",?"Director?Approval",?0);
????????????????????gridView.Columns.Add(drtAppField);

????????????????????SPBoundField?priceField?=?CreateNewBoundField("Total?Price",?"Total?Price",?0);
????????????????????gridView.Columns.Add(priceField);

????????????????????gridView.AllowGrouping?=?true;
????????????????????gridView.AllowGroupCollapse?=?true;
????????????????????gridView.GroupField?=?"Team";
????????????????????gridView.GroupFieldDisplayName?=?"Team";

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但是"Team"這個(gè)Field在數(shù)據(jù)源的List中是Lookup類型的，如果不作處理，那么顯示的結(jié)果將會(huì)是Team：23;#SharePoint Test,即 連lookupid也顯示出來了，這里我們需要在數(shù)據(jù)綁定的時(shí)候作處理，為此我們添加了gridView.RowDataBound += new GridViewRowEventHandler(gridView_RowDataBound)這個(gè)事件，gridView_RowDataBound的代碼如下：

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代碼

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void?gridView_RowDataBound(object?sender,?GridViewRowEventArgs?e)
????????{
????????????if?(e.Row.RowType?==?DataControlRowType.DataRow)
????????????{
????????????????if?((sender?as?SPGridView).AllowGrouping)
????????????????{
????????????????????SPGridViewRow?gridViewRow?=?e.Row?as?SPGridViewRow;
????????????????????if?(gridViewRow?!=?null?&&?gridViewRow.HeaderText?!=?null)
????????????????????{
????????????????????????gridViewRow.HeaderText?=?"Team?:?"?+?new?SPFieldLookupValue(DataBinder.GetPropertyValue(e.Row.DataItem,?(sender?as?SPGridView).GroupField).ToString()).LookupValue;
????????????????????}
????????????????}
????????????}
????????}

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這樣，確保我們?cè)赟PGridView中做Groupby時(shí)，顯示的只是LookupValue，而非LookupId;#LookUpValue的形式。

另外我們可以通過設(shè)置SPGridView的DataKeyNames為各行保存一些我們可能需要的信息，例如

gridView.DataKeyNames = new string[] { "ID", "Team", "Created By", "Total Price", "Machine Type", "Component Type", "Purchase Number", "Shipped Order" };

如下就可以使用這些數(shù)據(jù)：

gridView.DataKeys[row.RowIndex].Values["Machine Type"].ToString();

我們用SPGridView作為WebPart開發(fā)的時(shí)候還遇到了一個(gè)問題，就是一訪問SharePoint的Session，頁面就報(bào)異常。但是在代碼中，并為出現(xiàn)異常，檢查了Web.config文件，發(fā)現(xiàn)HttpModule中也加了Session Module，<Page>節(jié)點(diǎn)中也Enable了Session, 至今未能找出原因，后來不得已，用了Context.Cache來代替，希望各位看官，有知道原因的，還請(qǐng)不吝賜教。謝謝拉～

SPGridView使用不復(fù)雜，關(guān)鍵還在于理清楚項(xiàng)目中的業(yè)務(wù)邏輯，選擇合適的Solution來解決問題。

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