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ASP.NETMVC5+EF6+EasyUI后台管理系统中的数据筛选怎么用

发表于:2024-11-19 作者:千家信息网编辑
千家信息网最后更新 2024年11月19日,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.
千家信息网最后更新 2024年11月19日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; ib?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
').appendTo(dc.view); } for(var field in opts.filterCache){ $(opts.filterCache[field]).appendTo(div); } var data = state.data; if (state.filterSource){ data = state.filterSource; $.map(data.rows, function(row){ row.children = undefined; }); } $(this)[name]({ data: data, loadFilter: (opts.oldLoadFilter||undefined), oldLoadFilter: null }); }); }, destroyFilter: function(jq, field){ return jq.each(function(){ var name = getPluginName(this); var state = $.data(this, name); var opts = state.options; if (field){ _destroy(field); } else { for(var f in opts.filterCache){ _destroy(f); } $(this).datagrid('getPanel').find('.datagrid-header .datagrid-filter-row').remove(); $(this).data('datagrid').dc.view.children('.datagrid-filter-cache').remove(); opts.filterCache = {}; $(this)[name]('resize'); $(this)[name]('disableFilter'); } function _destroy(field){ var c = $(opts.filterCache[field]); var input = c.find('.datagrid-filter'); if (input.length){ var filter = input[0].filter; if (filter.destroy){ filter.destroy(input[0]); } } c.find('.datagrid-filter-btn').each(function(){ $(this.menu).menu('destroy'); }); c.remove(); opts.filterCache[field] = undefined; } }); }, getFilterRule: function(jq, field){ return getFilterRule(jq[0], field); }, addFilterRule: function(jq, param){ return jq.each(function(){ addFilterRule(this, param); }); }, removeFilterRule: function(jq, field){ return jq.each(function(){ removeFilterRule(this, field); }); }, doFilter: function(jq){ return jq.each(function(){ doFilter(this); }); }, getFilterComponent: function(jq, field){ return getFilterComponent(jq[0], field); }, resizeFilter: function(jq, field){ return jq.each(function(){ resizeFilter(this, field); }); } });})(jQuery);InitDateFilter = function (dg, field, op) { var filter = { field: field, type: 'datebox', options: { editable: false, onChange: function (newValue, oldValue) { var curRule = dg.datagrid("getFilterRule", field); if (curRule != null) { curRule.value = newValue; dg.datagrid('addFilterRule', curRule); } } }, op: op }; return filter;};//Combox类型过滤InitComboFilter = function (dg, field, data, url, valueField, textField, checkFiled, method) { var comboOption; if (url != null) { comboOption = { panelHeight: 'auto', url: url, method: method, valueField: valueField, textField: textField, panelMaxHeight: 200, onLoadSuccess: function (result) { data = result; }, onChange: function (value) { DoComboFilter(dg, data, field, value, checkFiled); } }; } else { comboOption = { panelHeight: 'auto', data: data, valueField: valueField, textField: textField, panelMaxHeight: 200, onChange: function (value) { DoComboFilter(dg, data, field, value, checkFiled); } }; } var filter = { field: field, type: 'combobox', options: comboOption, } //$(".datagrid-filter-row td[field='" + field + "']").find("input").height(22); //console.log($(".datagrid-filter-row").html()); return filter;};InitNumberFilter = function (dg, field, op) { var filter = { field: field, type: 'numberbox', options: { precision: 1 }, op: op }; return filter;};//启动combo过滤器function DoComboFilter(dg, data, field, value, checkFiled) { if (value == "") { dg.datagrid('removeFilterRule', field); dg.datagrid('doFilter'); return; } // if (Common.CommonHelper.lslnArray(data, value, checkFiled)) { dg.datagrid('addFilterRule', { field: field, op: 'equal', value: value }); dg.datagrid('doFilter'); // }}

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 List GetList(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  ///  ///  //  ///  ///  /// ///  ///  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))   {    List dataFilterList = 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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