並べ替えが呼び出されたときに、デフォルトのMVC3 WebGridの並べ替え動作をオーバーライドして、コントローラー（サーバー側の並べ替えを実行し、データを返す）を呼び出す方法はありますか？
助けてくれてありがとう！
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サーバー側で並べ替えられたデータを、レコードの数に関する情報とともにWebグリッドに渡すことができます。 http://msdn.microsoft.com/en-us/magazine/hh288075.aspxには、役立つウォークスルーがあります。渡されるデータの量を最小限に抑えるために、データベースレベルの並べ替え/フィルタリング/ページングを行っています。IEnumerableコレクションをラップする非常に軽量なビューモデルを除いて、顧客が持っている70,000個のオブジェクトをすべて渡して、1ページの25を表示できるようにした場合、Webサーバーが私を気に入ってくれるとは思いません。いくつかの追加のページングデータがあります。
Webグリッドはクエリ文字列変数を使用して何をするかを決定するだけなので、getメソッドフォームを使用する必要があります。また、webgridが読み取り方法を認識できるように、クエリ文字列に並べ替えフィールド/方向を含める必要があります。したがって、最終的にはlocalhost / example / admin / things？thingName = Hyatt＆City =＆State = TX＆Country =＆sort = city＆sortdir=ASCのようなURLになります。
コントローラ：
public ActionResult Index(string thingName, string city, string state, string country, int page = 1)
{
const int pageSize = 25;
int totalRecords = 0;
IEnumerable<Thing> things = ThingModel.GetPagedSortedLocationsForCustomer(customerId, sort, sortdir, out totalRecords, pageSize, page, thingName, city, state, country);
PagedThings viewModel = new PagedThings(pageSize, page, totalRecords, things);
return View(viewModel);
}
意見：
@model ExampleCompany.Area.ViewModels.PagedThings
@{
using (Html.BeginForm("Index", "ThingaMaBob", System.Web.Mvc.FormMethod.Get))
{
<label for="ThingName">ThingName</label>@Html.TextBox("ThingName", "")
<label for="City">City</label>@Html.TextBox("City", "")
<label for="State">State</label>@Html.TextBox("State", "")
<label for="Country">Country</label>@Html.TextBox("Country", "")
<input type="submit" value="Filter" />
<br />
var grid = new WebGrid(canPage: true, rowsPerPage: Model.PageSize, canSort: true);
grid.Bind(Model.Things, rowCount: Model.TotalRows, autoSortAndPage: false);
grid.Pager(WebGridPagerModes.All);
@grid.GetHtml(htmlAttributes: new { id = "grid"},
columns: grid.Columns(
//ommitted
grid.Column("thingName", "Thing"),
));
Html.Hidden(grid.SortFieldName, grid.SortColumn);
Html.Hidden(grid.SortDirectionFieldName, grid.SortDirection == SortDirection.Ascending ? "ASC" : "DESC");
}
モデル：
public static IEnumerable<Thing> GetPagedSortedThingsForCustomer(int customerid, String sortby, String sorttype, out int totalRecords, int pageSize, int pageIndex, string thingName, string city, string state, string country)
{
var tmp = new List<Thing>();
int total = 0;
dynamic dr = OurDBUtility.ReturnDR("ExampleProc_GetThingsSortedPaged", ConnectionInfo.ExampleConnection, customerid, sortby, sorttype, pageSize, pageIndex, thingName, city, state, country);
{
while (dr.Read())
{
var tmpThing = new Thing();
tmpThing.LoadFromDr(dr);
tmp.Add(tmpThing);
if (total == 0)
{
total = (int)dr["TOTAL_THINGS"];
}
}
}
totalRecords = total;
return tmp;
}
動的SQLを使用したProc-はい、必要に応じてLinq-to-Sqlまたは他の手法を使用できますが、私は古い学校です：
CREATE PROCEDURE ExampleProc_GetThingsSortedPaged
( @CustomerId int
, @sortby nvarchar(60)
, @sorttype nvarchar(60)
, @pageSize int
, @pageIndex int
, @thingName nvarchar(255) = null
, @city nvarchar(30) = null
, @state nvarchar(30) = null
, @country char(2) = null
)
as
DECLARE @strSql nvarchar(3000)
--calculate paging rows
declare @startRow int, @endRow int
--e.g. if you have a page size of 10, page 1 = 1 - 10, page 2 = 11 -20
set @startRow = ((@pageIndex - 1) * @pageSize) + 1
set @endRow = @startRow + @pageSize - 1
if @thingName = ''
set @thingName = null
if @city = ''
set @city = null
if @state = ''
set @state = null
if @country = ''
set @country = null
--return total for webgrid, accounting for filter
declare @totalThings int
select @totalThings = COUNT(*)
from EXAMPLE_TABLE T with(nolock)
where CUSTOMER_ID = @CustomerId
AND (T.THING_NAME LIKE @thingName + '%' OR @thingName is null)
AND (T.CITY LIKE @city + '%' or @city is null)
AND (T.STATE LIKE @state + '%' or @state is null)
AND (T.COUNTRY = @country or @country is null)
DECLARE @ParameterDefinition AS NVARCHAR(200)
set @ParameterDefinition = '@totalThings int, @CustomerId INT, @startRow INT, @endRow INT, @thingName nvarchar(255), @city nvarchar(30), @state nvarchar(30), @country char(2)'
--When we need to do dynamic sql it is better to use paramterization, but you cannot do (ORDER BY @sortBy).
SET @strSql = N'SELECT * from
(
select ROW_NUMBER() OVER (ORDER BY T.' + @sortby + ' ' + @sorttype + ') as Row,
@totalThings [TOTAL_THINGS],
T.THING_ID, T.THING_NAME, T.ADDRESS, T.CITY, T.STATE,
T.ZIP_CODE, T.COUNTRY
FROM EXAMPLE_TABLE T
WHERE T.CUSTOMER_ID = @CustomerId
AND (T.THING_NAME LIKE @thingName + ''%'' OR @thingName is null)
AND (T.CITY LIKE @city + ''%'' or @city is null)
AND (T.STATE LIKE @state + ''%'' or @state is null)
AND (T.COUNTRY = @country or @country is null)
) paged
where Row between @startRow and @endRow
ORDER BY Row'
--print @strSql
EXECUTE sp_executesql @strSql, @ParameterDefinition, @totalThings, @CustomerId, @startRow, @endRow, @thingName, @city, @state, @country
GO
CTEによる手順：
CREATE PROCEDURE ExampleProc_GetThingsSortedPaged
( @CustomerID int
, @sortby nvarchar(60)
, @sorttype nvarchar(60)
, @pageSize int = 25
, @pageIndex int = 1
, @thingName nvarchar(255) = null
, @city varchar(30) = null
, @state nvarchar(30) = null
, @country char(2) = null
)
as
declare @startRow int
declare @endRow int
SET @startRow = ((@pageIndex - 1) * @pageSize) + 1;
SET @endRow = @startRow + @pageSize - 1;
set @sortby = replace(LOWER(@sortby), '_', '')
SET @sorttype = LOWER(@sorttype)
if @sorttype != 'asc' and @sorttype != 'desc'
begin
set @sorttype = 'asc'
end
;with cte_things as (
SELECT
CASE
WHEN @sortby ='country' AND @sorttype = 'asc' then row_number() over (order by C.COUNTRY_NAME ASC)
WHEN @sortby ='country' AND @sorttype = 'desc' then row_number() over (order by C.COUNTRY_NAME DESC)
WHEN @sortby ='state' AND @sorttype = 'asc' then row_number() over (order by STATE ASC)
WHEN @sortby ='state' AND @sorttype = 'desc' then row_number() over (order by STATE DESC)
WHEN @sortby ='city' AND @sorttype = 'asc' then row_number() over (order by CITY ASC)
WHEN @sortby ='city' AND @sorttype = 'desc' then row_number() over (order by CITY DESC)
WHEN @sortby ='thingname' AND @sorttype = 'desc' then row_number() over (order by THING_NAME DESC)
ELSE row_number() over (order by THING_NAME ASC)
END AS Row
,T.THING_ID, T.THING_NAME, T.THING_TYPE, T.ADDRESS, T.CITY, T.STATE
, T.ZIP_CODE, T.COUNTRY_CODE, C.COUNTRY_NAME, T.PHONE_NUMBER
, T.LATITUDE, T.LONGITUDE
FROM EXAMPLE_TABLE L
join COUNTRIES C
on C.COUNTRY_CODE = L.COUNTRY_CODE
where
T.CUSTOMER_ID = @CustomerId
and L.CITY = ISNULL(@city, CITY)
and L.STATE = ISNULL(@state, STATE)
and L.COUNTRY_CODE = ISNULL(@country, L.COUNTRY_CODE)
and L.THING_NAME = ISNULL(@thingName, THING_NAME)
)
, cte_total as (select COUNT(*) as TOTAL_THINGS from cte_things)
, cte_all as (select cte_things.*, cte_total.TOTAL_THINGS from cte_things cross join cte_total)
SELECT * FROM cte_all
where
Row >= @startRow
and Row <= @endRow
ORDER BY Row
GO
于 2012-05-25T18:42:43.580 に答える