ASP.Net开发中datatable的几种思路
来源：爱站网时间：2020-06-29编辑：网友分享
datatable与内存的数据是有关联的，而我们可以通过几种方式实现，最常见的是以下几种，下文是爱站技术频道小编和大家分享的ASP.Net开发中datatable的几种思路，参考下文看看吧！
datatable与内存的数据是有关联的，而我们可以通过几种方式实现，最常见的是以下几种，下文是爱站技术频道小编和大家分享的ASP.Net开发中datatable的几种思路，参考下文看看吧！
实现思路：
使用datatable内置的分页，排序
使用attribute+反射来控制需要排序和显示的字段以及顺序
分离排序和显示逻辑
若要添加搜索逻辑只需要传递搜索的字段到后端即可(js初始化时把"searching": false拿掉)。
View :
@using BCMS.BusinessLogic @using BCMS.BusinessLogic.Models @model List@section scripts { }
@Html.DisplayNameFor(model => model.First().PersNo) @Html.DisplayNameFor(model => model.First().Personnel_Name) @Html.DisplayNameFor(model => model.First().Position) @Html.DisplayNameFor(model => model.First().Interchange) Action
Controller :
public ActionResult GetJsonData(int draw, int start, int length)
{
string search = Request.QueryString[DataTableQueryString.Searching];
string sortColumn = "";
string sortDirection = "asc";
if (Request.QueryString[DataTableQueryString.OrderingColumn] != null)
{
sortColumn = GetSortColumn(Request.QueryString[DataTableQueryString.OrderingColumn]);
}
if (Request.QueryString[DataTableQueryString.OrderingDir] != null)
{
sortDirection = Request.QueryString[DataTableQueryString.OrderingDir];
}
DataTableData dataTableData = new DataTableData();
dataTableData.draw = draw;
int recordsFiltered = 0;
dataTableData.data = BusCaptainService.Instance.SearchMyBuscaptains(User.Identity.Name, out recordsFiltered, start, length, sortColumn, sortDirection, search).Data;
dataTableData.recordsFiltered = recordsFiltered;
return Json(dataTableData, JsonRequestBehavior.AllowGet);
}
public string GetSortColumn(string sortColumnNo)
{
var name = DataTableHelper.SoringColumnName(sortColumnNo);
return name;
}
public class DataTableData
{
public int draw { get; set; }
public int recordsFiltered { get; set; }
public List data { get; set; }
}
Model :
class XXX{
...
[DisplayColumn(0)]
[SortingColumn(0)]
public int? A { get; set; }
[DisplayColumn(1)]
[SortingColumn(1)]
public string B { get; set; }
...
}
Helper class :
public class SortingColumnAttribute : Attribute
{
public int Index { get; }
public SortingColumnAttribute(int index)
{
Index = index;
}
}
public class DisplayColumnAttribute : Attribute
{
public int Index { get; }
public DisplayColumnAttribute(int index)
{
Index = index;
}
}
public static class DataTableQueryString
{
public static string OrderingColumn = "order[0][column]";
public static string OrderingDir = "order[0][dir]";
public static string Searching = "search[value]";
}
public static class DataTableHelper
{
public static IList DisplayColumns()
{
var result = new Dictionary();
var props = typeof(T).GetProperties();
foreach (var propertyInfo in props)
{
var propAttr =
propertyInfo
.GetCustomAttributes(false)
.OfType()
.FirstOrDefault();
if (propAttr != null)
{
result.Add(propAttr.Index,propertyInfo.Name);
}
}
return result.OrderBy(x => x.Key).Select(x => x.Value).ToList();
}
public static string SoringColumnName(string columnIndex)
{
int index;
if (!int.TryParse(columnIndex, out index))
{
throw new ArgumentOutOfRangeException();
}
return SoringColumnName(index);
}
public static string SoringColumnName(int index)
{
var props = typeof(T).GetProperties();
foreach (var propertyInfo in props)
{
var propAttr =
propertyInfo
.GetCustomAttributes(false)
.OfType()
.FirstOrDefault();
if (propAttr != null && propAttr.Index == index)
{
return propertyInfo.Name;
}
}
return "";
}
}
Query：
...
var query = context.BusCaptains
.Where(x => ...)
.OrderByEx(sortDirection, sortField)
.Skip(start)
.Take(pageSize);
...
LINQ Helper :
... public static IQueryableOrderByEx (this IQueryable q, string direction, string fieldName) { try { var customProperty = typeof(T).GetCustomAttributes(false).OfType ().FirstOrDefault(); if (customProperty != null) { fieldName = customProperty.Name; } var param = Expression.Parameter(typeof(T), "p"); var prop = Expression.Property(param, fieldName); var exp = Expression.Lambda(prop, param); string method = direction.ToLower() == "asc" ? "OrderBy" : "OrderByDescending"; Type[] types = new Type[] {q.ElementType, exp.Body.Type}; var mce = Expression.Call(typeof(Queryable), method, types, q.Expression, exp); return q.Provider.CreateQuery (mce); } catch (Exception ex) { _log.ErrorFormat("error form OrderByEx."); _log.Error(ex); throw ; } } ... 上述是爱站技术频道小编为大家带来的ASP.Net开发中datatable的几种思路，开发中我们要爱惜我们的项目，他们就像是我们自己培育的孩子一样。
