当调用sort时，有没有办法覆盖默认的MVC3 WebGrid排序行为来调用我的控制器（它将执行服务器端排序并返回数据）？
感谢您的帮助！
答案 0 :(得分：9)
您可以将服务器端排序数据传递给webgrid，以及有关记录数量的信息。 http://msdn.microsoft.com/en-us/magazine/hh288075.aspx有一个有用的演练。我正在进行数据库级排序/过滤/分页，以最大限度地减少传递的数据量。我不认为我的网络服务器会爱我，如果我通过了客户所有的70,000个对象，他们就可以看到第1页上的25个。这几乎是你需要的一切，除了包装你的IEnumerable集合的非常轻量级的视图模型一些额外的分页数据。
由于web网格只使用查询字符串变量决定要做什么，因此需要使用get方法表单。并且您需要以webgrid知道如何读取它的方式在querystring中包含排序字段/方向。所以你最终得到像localhost / example / admin / thing这样的网址？thingName = Hyatt＆amp; City =＆amp; State = TX＆amp; Country =＆amp; sort = city＆amp; sortdir = ASC
控制器：
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);
}
查看：
@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");
}
型号：
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;
}
使用动态sql进行处理 - 是的，如果你愿意，你可以使用Linq-to-Sql或其他技术，但我已经老了：
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
Proc CTE：
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