ASP.NETMVC5+EF6+EasyUI后台管理系统中的数据筛选怎么用
这篇文章给大家介绍ASP.NETMVC5+EF6+EasyUI后台管理系统中的数据筛选怎么用,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
我们都知道Excel中是如何筛选数据的.就像下面一样
他是一个并的关系,我们现在要做的也是这样的效果,下面我们将利用EasyUI的DataGrid为例来扩展(就算是其他组件也是可以的,同样的实现方式!)
实现思路
1.前台通过查询组合json
2.后台通过反射拆解json
3.进行组合查询
虽然短短3点,够你写个3天天夜了
优点:需要从很多数据中得到精准的数据,通常查一些商品他们的属性异常接近的情况下使用
缺点:我实现的方式为伪查询,大量数据请使用存储过程
简单了解
从Easyui的官方扩展中了解到一个JS文件,但是实质上,这个文件BUG很多,在使用中我曾经一度认为是使用出现问题,其实他根本就不可用
所以我这里先献上修改后的整个JS代码
(function($){ function getPluginName(target){ if ($(target).data('treegrid')){ return 'treegrid'; } else { return 'datagrid'; } } var autoSizeColumn1 = $.fn.datagrid.methods.autoSizeColumn; var loadDataMethod1 = $.fn.datagrid.methods.loadData; var appendMethod1 = $.fn.datagrid.methods.appendRow; var deleteMethod1 = $.fn.datagrid.methods.deleteRow; $.extend($.fn.datagrid.methods, { autoSizeColumn: function(jq, field){ return jq.each(function(){ var fc = $(this).datagrid('getPanel').find('.datagrid-header .datagrid-filter-c'); fc.hide(); autoSizeColumn1.call($.fn.datagrid.methods, $(this), field); fc.show(); resizeFilter(this, field); }); }, loadData: function(jq, data){ jq.each(function(){ $.data(this, 'datagrid').filterSource = null; }); return loadDataMethod1.call($.fn.datagrid.methods, jq, data); }, appendRow: function(jq, row){ var result = appendMethod1.call($.fn.datagrid.methods, jq, row); jq.each(function(){ var state = $(this).data('datagrid'); if (state.filterSource){ state.filterSource.total++; if (state.filterSource.rows != state.data.rows){ state.filterSource.rows.push(row); } } }); return result; }, deleteRow: function(jq, index){ jq.each(function(){ var state = $(this).data('datagrid'); var opts = state.options; if (state.filterSource && opts.idField){ if (state.filterSource.rows == state.data.rows){ state.filterSource.total--; } else { for(var i=0; i=0 ? state.filterSource.rows[index]._parentId : null; var rows = translateTreeData(this, [param.data], pid); var newRows = state.filterSource.rows.splice(0, index>=0 ? (param.before ? index : index+1) : (state.filterSource.rows.length)); newRows = newRows.concat(rows); newRows = newRows.concat(state.filterSource.rows); state.filterSource.total += rows.length; state.filterSource.rows = newRows; $(this).treegrid('loadData', state.filterSource); function getNodeIndex(id){ var rows = state.filterSource.rows; for(var i=0; i ').appendTo(container); }, getValue: function(target){ return $(target).html(); }, setValue: function(target, value){ $(target).html(value); }, resize: function(target, width){ $(target)._outerWidth(width)._outerHeight(22); } } }); $.fn.treegrid.defaults.filters = $.fn.datagrid.defaults.filters; // filter operators $.fn.datagrid.defaults.operators = { nofilter: { text:Lang.Nofilter //'No Filter' }, contains: { text:Lang.Contains , isMatch: function(source, value){ source = String(source); value = String(value); return source.toLowerCase().indexOf(value.toLowerCase()) >= 0; } }, equal: { text:Lang.Equal, isMatch: function(source, value){ return source == value; } }, notequal: { text: Lang.Notequal, isMatch: function(source, value){ return source != value; } }, beginwith: { text: Lang.Beginwith, isMatch: function(source, value){ source = String(source); value = String(value); return source.toLowerCase().indexOf(value.toLowerCase()) == 0; } }, endwith: { text:Lang.Endwith, isMatch: function(source, value){ source = String(source); value = String(value); return source.toLowerCase().indexOf(value.toLowerCase(), source.length - value.length) !== -1; } }, less: { text: Lang.Less, isMatch: function(source, value){ return source < value; } }, lessorequal: { text: Lang.Lessorequal, isMatch: function(source, value){ return source <= value; } }, greater: { text: Lang.Greater, isMatch: function(source, value){ return source > value; } }, greaterorequal: { text: Lang.Greaterorequal, isMatch: function(source, value){ return source >= value; } } }; $.fn.treegrid.defaults.operators = $.fn.datagrid.defaults.operators; function resizeFilter(target, field){ var toFixColumnSize = false; var dg = $(target); var header = dg.datagrid('getPanel').find('div.datagrid-header'); var tr = header.find('.datagrid-header-row:not(.datagrid-filter-row)'); var ff = field ? header.find('.datagrid-filter[name="'+field+'"]') : header.find('.datagrid-filter'); ff.each(function(){ var name = $(this).attr('name'); var col = dg.datagrid('getColumnOption', name); var cc = $(this).closest('div.datagrid-filter-c'); var btn = cc.find('a.datagrid-filter-btn'); var cell = tr.find('td[field="'+name+'"] .datagrid-cell'); var cellWidth = cell._outerWidth(); if (cellWidth != _getContentWidth(cc)){ this.filter.resize(this, cellWidth - btn._outerWidth()); } if (cc.width() > col.boxWidth+col.deltaWidth-1){ col.boxWidth = cc.width() - col.deltaWidth + 1; col.width = col.boxWidth + col.deltaWidth; toFixColumnSize = true; } }); if (toFixColumnSize){ $(target).datagrid('fixColumnSize'); } function _getContentWidth(cc){ var w = 0; $(cc).children(':visible').each(function(){ w += $(this)._outerWidth(); }); return w; } } function getFilterComponent(target, field){ var header = $(target).datagrid('getPanel').find('div.datagrid-header'); return header.find('tr.datagrid-filter-row td[field="'+field+'"] .datagrid-filter'); } /** * get filter rule index, return -1 if not found. */ function getRuleIndex(target, field){ var name = getPluginName(target); var rules = $(target)[name]('options').filterRules; for(var i=0; i = 0){ return rules[index]; } else { return null; } } function addFilterRule(target, param) { var name = getPluginName(target); var opts = $(target)[name]('options'); var rules = opts.filterRules; if (param.op == 'nofilter'){ removeFilterRule(target, param.field); } else { var index = getRuleIndex(target, param.field); if (index >= 0){ $.extend(rules[index], param); } else { rules.push(param); } } var input = getFilterComponent(target, param.field); if (input.length){ if (param.op != 'nofilter'){ input[0].filter.setValue(input, param.value); } var menu = input[0].menu; if (menu){ menu.find('.'+opts.filterMenuIconCls).removeClass(opts.filterMenuIconCls); var item = menu.menu('findItem', opts.operators[param.op]['text']); menu.menu('setIcon', { target: item.target, iconCls: opts.filterMenuIconCls }); } } } function removeFilterRule(target, field){ var name = getPluginName(target); var dg = $(target); var opts = dg[name]('options'); if (field){ var index = getRuleIndex(target, field); if (index >= 0){ opts.filterRules.splice(index, 1); } _clear([field]); } else { opts.filterRules = []; var fields = dg.datagrid('getColumnFields',true).concat(dg.datagrid('getColumnFields')); _clear(fields); } function _clear(fields){ for(var i=0; i b?1:-1); }; r = sortFunc(r1[sn], r2[sn]) * (so=='asc'?1:-1); if (r != 0){ return r; } } return r; }); } data = opts.filterMatcher.call(target, { total: state.filterSource.total, rows: state.filterSource.rows }); if (opts.pagination){ var dg = $(target); var pager = dg[name]('getPager'); pager.pagination({ onSelectPage:function(pageNum, pageSize){ opts.pageNumber = pageNum; opts.pageSize = pageSize; pager.pagination('refresh',{ pageNumber:pageNum, pageSize:pageSize }); //dg.datagrid('loadData', state.filterSource); dg[name]('loadData', state.filterSource); }, onBeforeRefresh:function(){ dg[name]('reload'); return false; } }); if (name == 'datagrid'){ var start = (opts.pageNumber-1)*parseInt(opts.pageSize); var end = start + parseInt(opts.pageSize); data.rows = data.rows.slice(start, end); } else { var topRows = []; var childRows = []; $.map(data.rows, function(row){ row._parentId ? childRows.push(row) : topRows.push(row); }); data.total = topRows.length; var start = (opts.pageNumber-1)*parseInt(opts.pageSize); var end = start + parseInt(opts.pageSize); data.rows = topRows.slice(start, end).concat(childRows); } } $.map(data.rows, function(row){ row.children = undefined; }); } return data; } function init(target, filters){ filters = filters || []; var name = getPluginName(target); var state = $.data(target, name); var opts = state.options; if (!opts.filterRules.length){ opts.filterRules = []; } opts.filterCache = opts.filterCache || {}; var dgOpts = $.data(target, 'datagrid').options; var onResize = dgOpts.onResize; dgOpts.onResize = function(width,height){ resizeFilter(target); onResize.call(this, width, height); } var onBeforeSortColumn = dgOpts.onBeforeSortColumn; dgOpts.onBeforeSortColumn = function(sort, order){ var result = onBeforeSortColumn.call(this, sort, order); if (result != false){ opts.isSorting = true; } return result; }; var onResizeColumn = opts.onResizeColumn; opts.onResizeColumn = function(field,width){ var fc = $(this).datagrid('getPanel').find('.datagrid-header .datagrid-filter-c'); fc.hide(); $(target).datagrid('fitColumns'); if (opts.fitColumns){ resizeFilter(target); } else { resizeFilter(target, field); } fc.show(); onResizeColumn.call(target, field, width); }; var onBeforeLoad = opts.onBeforeLoad; opts.onBeforeLoad = function(param1, param2){ if (param1){ param1.filterRules = opts.filterStringify(opts.filterRules); } if (param2){ param2.filterRules = opts.filterStringify(opts.filterRules); } var result = onBeforeLoad.call(this, param1, param2); if (result != false && opts.url) { if (name == 'datagrid'){ state.filterSource = null; } else if (name == 'treegrid' && state.filterSource){ if (param1){ var id = param1[opts.idField]; // the id of the expanding row var rows = state.filterSource.rows || []; for(var i=0; i ' + 'a.datagrid-filter-btn{display:inline-block;width:16px;height:16px;vertical-align:top;cursor:pointer;opacity:0.6;filter:alpha(opacity=60);}' + 'a:hover.datagrid-filter-btn{opacity:1;filter:alpha(opacity=100);}' + '.datagrid-filter-row .textbox,.datagrid-filter-row .textbox .textbox-text{-moz-border-radius:0;-webkit-border-radius:0;border-radius:0;height:22px;line-height:22px;padding:0px;padding-left:3px;}' + '.datagrid-filter-row input{margin:0;-moz-border-radius:0;-webkit-border-radius:0;border-radius:0;}' + '.datagrid-filter-cache{position:absolute;width:10px;height:10px;left:-99999px;}' + '' ); } } /** * create filter component */ function createFilter(frozen){ var dc = state.dc; var fields = $(target).datagrid('getColumnFields', frozen); if (frozen && opts.rownumbers){ fields.unshift('_'); } var table = (frozen?dc.header1:dc.header2).find('table.datagrid-htable'); // clear the old filter component table.find('.datagrid-filter').each(function(){ if (this.filter.destroy){ this.filter.destroy(this); } if (this.menu){ $(this.menu).menu('destroy'); } }); table.find('tr.datagrid-filter-row').remove(); var tr = $(' '); if (opts.filterPosition == 'bottom'){ tr.appendTo(table.find('tbody')); } else { tr.prependTo(table.find('tbody')); } if (!opts.showFilterBar){ tr.hide(); } for(var i=0; i ').attr('field', field).appendTo(tr); if (col && col.hidden){ td.hide(); } if (field == '_'){ continue; } if (col && (col.checkbox || col.expander)){ continue; } var fopts = getFilter(field); if (fopts){ $(target)[name]('destroyFilter', field); // destroy the old filter component } else { fopts = $.extend({}, { field: field, type: opts.defaultFilterType, options: opts.defaultFilterOptions }); } var div = opts.filterCache[field]; if (!div){ div = $('').appendTo(td); var filter = opts.filters[fopts.type]; var input = filter.init(div, fopts.options||{}); input.addClass('datagrid-filter').attr('name', field); input[0].filter = filter; input[0].menu = createFilterButton(div, fopts.op); if (fopts.options){ if (fopts.options.onInit){ fopts.options.onInit.call(input[0], target); } } else { opts.defaultFilterOptions.onInit.call(input[0], target); } opts.filterCache[field] = div; resizeFilter(target, field); } else { div.appendTo(td); } } } function createFilterButton(container, operators){ if (!operators){return null;} var btn = $(' ').addClass(opts.filterBtnIconCls); if (opts.filterBtnPosition == 'right'){ btn.appendTo(container); } else { btn.prependTo(container); } var menu = $('').appendTo('body'); $.map(['nofilter'].concat(operators), function(item){ var op = opts.operators[item]; if (op){ $('').attr('name', item).html(op.text).appendTo(menu); } }); menu.menu({ alignTo:btn, onClick:function(item){ var btn = $(this).menu('options').alignTo; var td = btn.closest('td[field]'); var field = td.attr('field'); var input = td.find('.datagrid-filter'); var value = input[0].filter.getValue(input); if (opts.onClickMenu.call(target, item, btn, field) == false){ return; } addFilterRule(target, { field: field, op: item.name, value: value }); doFilter(target); } }); btn[0].menu = menu; btn.bind('click', {menu:menu}, function(e){ $(this.menu).menu('show'); return false; }); return menu; } function getFilter(field){ for(var i=0; i
修改版datagrid-filter.js
为了实现一个目的:输入数据后按回车查询数据。
这个扩展可以集成:Easyui 90%的Form组件
1.时间
2.数字
3.下拉Combobox
4.密码框
等等.......
实际上只用到1,2,3个Combxbox一般为动态数据AJAX从后台获取
看到代码(我已经封装好了,尽情调用即可,想要了解就进入查看代码写法和逻辑)
上面的废话已经说完了!下面来说说如何调用
前端实现方式
1.引入datagrid-filter.js
2.调用
调用之前来看看我们以前写的datagrid。这是一个普通的datagrid
$('#List').datagrid({ url: '@Url.Action("GetList")', width: SetGridWidthSub(10), methord: 'post', height: $(window).height()/2-35, fitColumns: true, sortName: 'CreateTime', sortOrder: 'desc', idField: 'Id', pageSize: 15, pageList: [15, 20, 30, 40, 50], pagination: true, striped: true, //奇偶行是否区分 singleSelect: true,//单选模式 remoteFilter:true, columns: [[ { field: 'Id', title: 'Id', width: 80,hidden:true}, { field: 'Name', title: '产品名称', width: 80, sortable: true }, { field: 'Code', title: '产品代码', width: 80, sortable: true }, { field: 'Price', title: '产品价格', width: 80, sortable: true }, { field: 'Color', title: '产品颜色', width: 80, sortable: true }, { field: 'Number', title: '产品数量', width: 80, sortable: true }, { field: 'CategoryId', title: '类别', width: 80, sortable: true, formatter: function (value, row, index) { return row.ProductCategory; } }, { field: 'ProductCategory', title: '类别', width: 80, sortable: true,hidden:true }, { field: 'CreateTime', title: 'CreateTime', width: 80, sortable: true }, { field: 'CreateBy', title: 'CreateBy', width: 80, sortable: true } ]] });
那么我只想告诉大家我的DataGrid用的id名称是List而已
var dg = $('#List'); var op = ['equal', 'notequal', 'less', 'greater']; var comboData=[{ value: '', text: 'All' }, { value: 'P', text: 'P' }, { value: 'N', text: 'N' }] dg.datagrid('enableFilter', [ InitNumberFilter(dg, 'Price', op), InitNumberFilter(dg, 'Number', op), InitDateFilter(dg, 'CreateTime', op), InitComboFilter(dg, 'CategoryId', comboData, '', 'Id', 'Name', 'Name', "post") ]);
那么前端的效果就出来了!如此简单都是因为封装的JS帮我们做了大量的工作,效果如下:
说明一下:InitComboFilter如果是Ajax那么第4个参数传URL即可,键值分别是Id和Name
其中:var op = ['equal', 'notequal', 'less', 'greater'];是漏斗,说再多也不明白,如要深入了解需要看源码
3.回车执行过滤
回车事件在源码中的
到此,前端的调用就结束了!
后台实现方式
因为前端会传过来多一个参数,所以我们后台需要写多一个参数来接受,修改以前的GridPager就补多一个参数就好了。
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Apps.Common{ public class GridPager { public int rows { get; set; }//每页行数 public int page { get; set; }//当前页是第几页 public string order { get; set; }//排序方式 public string sort { get; set; }//排序列 public int totalRows { get; set; }//总行数 public int totalPages //总页数 { get { return (int)Math.Ceiling((float)totalRows / (float)rows); } } public string filterRules { get; set; } } public class GridRows{ public List rows { get; set; } public int total { get; set; } }}
public string filterRules { get; set; }
所以Controller没有变化。
BLL变化如下:
using Apps.Common;using Apps.Models;using Apps.Models.Spl;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Apps.Spl.BLL{ public partial class Spl_ProductBLL { public override ListGetList(ref GridPager pager, string queryStr) { IQueryable queryData = null; if (!string.IsNullOrWhiteSpace(queryStr)) { queryData = m_Rep.GetList( a=>a.Id.Contains(queryStr) || a.Name.Contains(queryStr) || a.Code.Contains(queryStr) || a.Color.Contains(queryStr) || a.CategoryId.Contains(queryStr) || a.CreateBy.Contains(queryStr) ); } else { queryData = m_Rep.GetList(); } //启用通用列头过滤 if (!string.IsNullOrWhiteSpace(pager.filterRules)) { List dataFilterList = JsonHandler.Deserialize >(pager.filterRules).Where(f => !string.IsNullOrWhiteSpace(f.value)).ToList(); queryData = LinqHelper.DataFilter
(queryData, dataFilterList); } pager.totalRows = queryData.Count(); //排序 queryData = LinqHelper.SortingAndPaging(queryData, pager.sort, pager.order, pager.page, pager.rows); return CreateModelList(ref queryData); } public override List CreateModelList(ref IQueryable queryData) { List modelList = (from r in queryData select new Spl_ProductModel { Id = r.Id, Name = r.Name, Code = r.Code, Price = r.Price, Color = r.Color, Number = r.Number, CategoryId = r.CategoryId, CreateTime = r.CreateTime, CreateBy = r.CreateBy, CostPrice = r.CostPrice, ProductCategory = r.Spl_ProductCategory.Name }).ToList(); return modelList; } }}//启用通用列头过滤 if (!string.IsNullOrWhiteSpace(pager.filterRules)) { List dataFilterList = JsonHandler.Deserialize >(pager.filterRules).Where(f => !string.IsNullOrWhiteSpace(f.value)).ToList(); queryData = LinqHelper.DataFilter
(queryData, dataFilterList); }
其他都不变。
后台也是做了大量大量的工作的,看LinqHelper这个类
using System;using System.Collections.Generic;using System.Linq;using System.Linq.Expressions;using System.Reflection;using System.Text;using System.Threading.Tasks;namespace Apps.Common{ public class LinqHelper { ////// 排序 /// ////// /// /// /// public static IQueryable DataSorting (IQueryable source, string sortExpression, string sortDirection) { //错误查询 if (string.IsNullOrEmpty(sortExpression) || string.IsNullOrEmpty(sortDirection)) { return source; } string sortingDir = string.Empty; if (sortDirection.ToUpper().Trim() == "ASC") sortingDir = "OrderBy"; else if (sortDirection.ToUpper().Trim() == "DESC") sortingDir = "OrderByDescending"; ParameterExpression param = Expression.Parameter(typeof(T), sortExpression); PropertyInfo pi = typeof(T).GetProperty(sortExpression); Type[] types = new Type[2]; types[0] = typeof(T); types[1] = pi.PropertyType; Expression expr = Expression.Call(typeof(Queryable), sortingDir, types, source.Expression, Expression.Lambda(Expression.Property(param, sortExpression), param)); IQueryable query = source.AsQueryable().Provider.CreateQuery (expr); return query; } /// /// 分页 /// ////// /// /// /// public static IQueryable DataPaging (IQueryable source, int pageNumber, int pageSize) { if (pageNumber <= 1) { return source.Take(pageSize); } else { return source.Skip((pageNumber - 1) * pageSize).Take(pageSize); } } /// /// 排序并分页 /// ////// /// /// /// /// /// public static IQueryable SortingAndPaging (IQueryable source, string sortExpression, string sortDirection, int pageNumber, int pageSize) { IQueryable query = DataSorting (source, sortExpression, sortDirection); return DataPaging(query, pageNumber, pageSize); } /// ///表达式操作 /// /// /// ///public delegate Expression ExpressionOpretaDelegate(Expression left, Expression right); /* * if (!string.IsNullOrWhiteSpace(pager.filterRules)) * { * IEnumerable dataFilterList = JsonHelper.DeserializeJsonToObject >(pager.filterRules).Where(f => !string.IsNullOrWhiteSpace(f.value)); * queryData = LinqHelper.DataFilter
(queryData.AsQueryable(), dataFilterList); * } */ /// ///通用数据列表按过滤方法 /// ///过滤的数据类型 ///过滤的数据源 ///过滤条件集合(包含,字段名,值,操作符) /// public static IQueryable DataFilter (IQueryable source, IEnumerable datas) { T obj = System.Activator.CreateInstance (); PropertyInfo[] properties = obj.GetType().GetProperties(); foreach (var item in datas) { PropertyInfo p = properties.Where(pro => pro.Name == item.field).FirstOrDefault(); //不进行无效过滤 if (p == null || item.value == null) { continue; } if (p.PropertyType == typeof(DateTime) || p.PropertyType == typeof(DateTime?)) { //时间过1滤 source = DateDataFilter (source, item, p); } else { //普通过滤 source = OrdinaryDataFilter (source, item, p); } } return source; } /// ///普通数据过滤 /// ////// /// /// /// private static IQueryable OrdinaryDataFilter (IQueryable source, DataFilterModel item, PropertyInfo p) { //var selectvalue = Convert. // ChangeType(item.value, p.PropertyType); var option = (DataFliterOperatorTypeEnum) Enum.Parse(typeof(DataFliterOperatorTypeEnum), item.op); switch (option) { case DataFliterOperatorTypeEnum.contains: { /* 包含, 目前只支持字符串 */ source = ExpressionOperate(StringContains, source, p, item.value); break; } case DataFliterOperatorTypeEnum.equal: { /* 等于 */ source = ExpressionOperate(Expression.Equal, source, p, item.value); break; } case DataFliterOperatorTypeEnum.greater: { /* 大于 */ source = ExpressionOperate(Expression.GreaterThan, source, p, item.value); break; } case DataFliterOperatorTypeEnum.greaterorequal: { /* 大于等于 */ source = ExpressionOperate(Expression.GreaterThanOrEqual, source, p, item.value); break; } case DataFliterOperatorTypeEnum.less: { /* 小于 */ source = ExpressionOperate(Expression.LessThan, source, p, item.value); break; } case DataFliterOperatorTypeEnum.lessorequal: { /* 小于等于 */ source = ExpressionOperate(Expression.LessThanOrEqual, source, p, item.value); break; } default: break; } return (source); } /// ///时间过滤 /// ////// /// /// /// public static IQueryable DateDataFilter (IQueryable source, DataFilterModel item, PropertyInfo p) { var selectDate= Convert.ToDateTime(item.value); var option= (DataFliterOperatorTypeEnum) Enum.Parse(typeof(DataFliterOperatorTypeEnum), item.op); switch(option) { case DataFliterOperatorTypeEnum.equal: { //大于0时 source=ExpressionOperate(Expression.GreaterThanOrEqual, source, p,selectDate); //小于后一天 var nextDate= selectDate.AddDays(1); source=ExpressionOperate(Expression.LessThan, source, p, nextDate); break; } case DataFliterOperatorTypeEnum.greater: { //大于等于后一天 selectDate= selectDate.AddDays(1); source=ExpressionOperate(Expression.GreaterThanOrEqual, source, p,selectDate); break; } case DataFliterOperatorTypeEnum.greaterorequal: { //大于等于当天 source=ExpressionOperate(Expression.GreaterThanOrEqual, source, p,selectDate); break; } case DataFliterOperatorTypeEnum.less: { //小于当天 source=ExpressionOperate(Expression. LessThan, source, p,selectDate); break; } case DataFliterOperatorTypeEnum.lessorequal: { //小于第二天 selectDate= selectDate.AddDays(1); source=ExpressionOperate(Expression. LessThan, source, p,selectDate); break; } default: break; } return source; } /// ///过滤操作 /// ///// /// param> /// /// /// /// private static IQueryable ExpressionOperate (ExpressionOpretaDelegate operateExpression, IQueryable source, PropertyInfo p, V value) { Expression right = null; if (p.PropertyType == typeof(Int32)) { int val = Convert.ToInt32(value); right = Expression.Constant(val, p.PropertyType); } else if (p.PropertyType == typeof(Decimal)) { Decimal val = Convert.ToDecimal(value); right = Expression.Constant(val, p.PropertyType); } else if (p.PropertyType == typeof(Byte)) { Byteval = Convert.ToByte(value); right = Expression.Constant(val, p.PropertyType); } else { right = Expression.Constant(value, p.PropertyType); } ParameterExpression param = Expression.Parameter(typeof(T), "x"); Expression left = Expression.Property(param, p.Name); Expression filter = operate_Expression(left, right); Expression > pred = Expression.Lambda >(filter, param); source = source.Where(pred); return source; } /// ///字符串包含操作 /// /// /// ///public static Expression StringContains(Expression left, Expression right) { Expression filter = Expression.Call(left, typeof(string).GetMethod("Contains"), right); return filter; } }}
预览效果:
总结
实现一个组合查询,只需要在原来的基础上添加几行代码
后台:
//启用通用列头过滤 if (!string.IsNullOrWhiteSpace(pager.filterRules)) { ListdataFilterList = JsonHandler.Deserialize >(pager.filterRules).Where(f => !string.IsNullOrWhiteSpace(f.value)).ToList(); queryData = LinqHelper.DataFilter
(queryData, dataFilterList); }
前端:
var dg = $('#List'); var op = ['equal', 'notequal', 'less', 'greater']; var comboData={Category:[]}; //[{ value: '', text: 'All' }, { value: 'P', text: 'P' }, { value: 'N', text: 'N' }] dg.datagrid('enableFilter', [ InitNumberFilter(dg, 'Price', op), InitNumberFilter(dg, 'Number', op), InitDateFilter(dg, 'CreateTime', op), InitComboFilter(dg, 'CategoryId', comboData, '../Spl/ProductCategory/GetComboxData', 'Id', 'Name', 'Name', "post") ]);
完全没有任何逻辑,谁都能用。
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