環境：

VS2010 , ASP web Forms , FineUI 4.2.3, LINQ TO SQL

要實現如下的查詢，使用資料庫分頁，一次只查詢介面需要的資料。

FineUI的定義：

<f:Grid ID="Grid1" ShowBorder="false" PageSize="15" AllowPaging="true" IsDatabasePaging="true"
                OnPageIndexChange="Grid1_PageIndexChange" ForceFit="true" ShowHeader="false"
                runat="server" EnableCollapse="true" DataKeyNames="Guid">
                <Columns>
                    <f:BoundField DataField="BOXBARCODE" HeaderText="包裝箱條碼" MinWidth="100px" />
                    <f:BoundField DataField="SCANDATE" HeaderText="日期" DataFormatString="{0:yyyy.MM.dd HH:mm:ss}" />
                    <f:BoundField DataField="LGORT" HeaderText="地點" />
                    <f:BoundField DataField="MATNR" HeaderText="物料" />
                    <f:BoundField DataField="LIFNR" HeaderText="供應商" />
                    <f:BoundField DataField="MENGE" HeaderText="數量" />
                    <f:BoundField DataField="WERKS" HeaderText="工廠" />
                    <f:BoundField DataField="ISGW" HeaderText="歸位" />
                </Columns>
            </f:Grid>
 

ASP頁面關鍵程式碼：

        DataTable dt = new DataTable();
        linq.DataClasses_GRDataContext db = new linq.DataClasses_GRDataContext();// 需要匯出XLS，所以定義為全域性變數

  var query = from c in db.GR
                                     where
                                         (
                                         (c.ASN.Contains(TextBox1.Text) || string.IsNullOrEmpty(TextBox1.Text.Trim())) &&
                                         (c.MATNR.Contains(TextBox2.Text) || string.IsNullOrEmpty(TextBox2.Text.Trim())) &&
                                         (c.LIFNR.Contains(TextBox3.Text) || string.IsNullOrEmpty(TextBox3.Text.Trim())) &&
                                         (c.SCANDATE.Value.Date.Equals(DatePicker1.SelectedDate) || string.IsNullOrEmpty(DatePicker1.Text.Trim()))
                                         )
                                     select c;
            

            // 1.控制元件設定總項數（特別注意：資料庫分頁一定要設定滿足條件的總記錄數RecordCount）
            Grid1.RecordCount = query.Count();

            // 2.獲取當前分頁資料
            var q = query.Skip(Grid1.PageIndex * Grid1.PageSize).Take(Grid1.PageSize);

            dt = mytools.ListToDataTable(q.ToList());

            // 3.繫結到Grid
            Grid1.DataSource = dt;
            Grid1.DataBind();       
 

看一下LINQ產生的SQL，第一個是count，第二個是15條資料

SELECT COUNT(*) AS [value]
FROM [dbo].[GR] AS [t0]
WHERE ([t0].[ASN] LIKE @p0) AND ([t0].[MATNR] LIKE @p1)
-- @p0: Input NVarChar (Size = 4000; Prec = 0; Scale = 0) [%5500005836%]
-- @p1: Input NVarChar (Size = 4000; Prec = 0; Scale = 0) [%10005731%]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 4.0.30319.18408

SELECT [t1].[ID], [t1].[ASN], [t1].[LGORT], [t1].[TXTID], [t1].[MATNR], [t1].[LIFNR], [t1].[MENGE], [t1].[WERKS], [t1].[BOXBARCODE], [t1].[SCANDATE], [t1].[ISGW]
FROM (
    SELECT ROW_NUMBER() OVER (ORDER BY [t0].[ID], [t0].[ASN], [t0].[LGORT], [t0].[TXTID], [t0].[MATNR], [t0].[LIFNR], [t0].[MENGE], [t0].[WERKS], [t0].[BOXBARCODE], [t0].[SCANDATE], [t0].[ISGW]) AS [ROW_NUMBER], [t0].[ID], [t0].[ASN], [t0].[LGORT], [t0].[TXTID], [t0].[MATNR], [t0].[LIFNR], [t0].[MENGE], [t0].[WERKS], [t0].[BOXBARCODE], [t0].[SCANDATE], [t0].[ISGW]
    FROM [dbo].[GR] AS [t0]
    WHERE ([t0].[ASN] LIKE @p0) AND ([t0].[MATNR] LIKE @p1)
    ) AS [t1]
WHERE [t1].[ROW_NUMBER] BETWEEN @p2 + 1 AND @p2 + @p3
ORDER BY [t1].[ROW_NUMBER]
-- @p0: Input NVarChar (Size = 4000; Prec = 0; Scale = 0) [%5500005836%]
-- @p1: Input NVarChar (Size = 4000; Prec = 0; Scale = 0) [%10005731%]
-- @p2: Input Int (Size = -1; Prec = 0; Scale = 0) [0]
-- @p3: Input Int (Size = -1; Prec = 0; Scale = 0) [15]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 4.0.30319.18408
 

這三行程式碼，可以檢視LINQ的SQL語句。

 #if DEBUG
                db.Log = new  DebugTextWriter(); //該類在mytools檔案中
            #endif

注意SCANDATE欄位，在資料庫中是Datetime型別，FineUI中DatePicker日期控制元件用SelectedDate屬性取到Datetime型別的變數。