C# jqGrid LINQ和匿名类型
jqGrid采用以下JSON格式:C# jqGrid LINQ和匿名类型,c#,asp.net,ajax,jqgrid,webforms,C#,Asp.net,Ajax,Jqgrid,Webforms,jqGrid采用以下JSON格式: { "total": "5", "page": "2", "records": "55", "rows" : [ {"id" :"21", "cell" :["cell11", "cell12", "cell13"]}, {"id" :"22", "cell" :["cell21", "cell22", "cell23"]}, ... {"id" :"30", "cell" :["cell31", "c
{
"total": "5",
"page": "2",
"records": "55",
"rows" : [
{"id" :"21", "cell" :["cell11", "cell12", "cell13"]},
{"id" :"22", "cell" :["cell21", "cell22", "cell23"]},
...
{"id" :"30", "cell" :["cell31", "cell32", "cell33"]},
]
}
我试图使一种方法尽可能可重用,以便通过AJAX将数据传递回jqGrid
var result = new
{
total = (int) Math.Ceiling((double) totalCount/PageSize),
page = PageIndex,
records = totalCount,
rows = data.Select((d, id) => new {id, cell = d.SerializeGridParameters()}).ToArray()
};
正如您所看到的,目前我没有额外的努力就添加了索引,但是我在字段数据方面遇到了问题
到目前为止,我通过使用一个界面来处理它:
public interface IGridParameterListable
{
List<string> SerializeGridParameters();
}
公共接口IGridParameterListable
{
列出参数();
}
对于我的数据(这是一个IEnumerable,其中T:IGridParameterListable
)。问题是,我更希望有一个通用方法,它只是盲目地将对象属性值转换为
列表
听起来不太可爱,我知道,我愿意接受其他想法。我希望尽可能避免在客户端和服务器端重复网格的数据结构。这可能是一个更好的选择
public string SerializeQuery<T>(IQueryable<T> query, Func<T, List<string>> select)
{
// stuff ...
var result = new
{
total = (int)Math.Ceiling((double)totalCount / PageSize),
page = PageIndex,
records = totalCount,
rows = data.Select((d, id) => new { id, cell = select(d) }).ToArray()
};
// stuff ...
}
公共字符串序列化查询(IQueryable查询,Func选择)
{
//东西。。。
var结果=新
{
总数=(整数)数学上限((两倍)总数/页面大小),
页面=页面索引,
记录=总计数,
rows=data.Select((d,id)=>new{id,cell=Select(d)}).ToArray()
};
//东西。。。
}
我消除了对接口的需要,并将转换转移到每个特定网格的查询实现。在本例中:
[WebMethod]
[ScriptMethod]
public string GetData(GridSettings grid)
{
var query = new FakeComputersRepository().Computers();
var response = grid.SerializeQuery(query, d => new List<string>
{
d.ID.ToString(),
d.IsOnline.ToString(),
d.Name,
d.IP,
d.User
});
return response;
}
[WebMethod]
[脚本方法]
公共字符串GetData(网格设置网格)
{
var query=new FakeComputersRepository().Computers();
var response=grid.SerializeQuery(查询,d=>newlist
{
d、 ID.ToString(),
d、 IsOnline.ToString(),
d、 名字,
d、 知识产权,
d、 使用者
});
返回响应;
}
我想好一点。
还有其他的想法吗?这不是答案,只是一些源代码
如果有人想要我的ASP.NET WebForms jqGrid实现,鉴于它很难实现,我将在这里发布代码
首先,一些JSON类:
public class GridFilter
{
public string groupOp { get; set; }
public GridRule[] rules { get; set; }
}
public class GridRule
{
public string field { get; set; }
public string op { get; set; }
public string data { get; set; }
}
public class GridSettings
{
public bool IsSearch { get; set; }
public int PageSize { get; set; }
public int PageIndex { get; set; }
public string SortColumn { get; set; }
public string SortOrder { get; set; }
public GridFilter Where { get; set; }
}
前端代码,我修改了一些,这样我就可以只使用一个参数,填充网格信息发布到服务。另外,我并不真正喜欢单过滤器,所以我只支持多过滤器模式(这在我看来绝对是更好的)
$(文档).ready(函数(){
$('#UsersGrid').jqGrid({
colNames:['ID','Online','Computer','IP','User'],
colModel:[
{名称:'ID',宽度:100,索引:'ID',搜索选项:{sopt:['eq',ne']},
{name:'IsOnline',宽度:100,索引:'IsOnline',搜索选项:{sopt:['eq','ne']},
{name:'name',index:'name',searchoptions:{sopt:['eq',ne',cn']},
{name:'IP',index:'IP',searchoptions:{sopt:['eq','ne','cn']},
{名称:'User',索引:'User',搜索选项:{sopt:['eq','ne','cn']}
],
jsonReader:{
root:function(json){return json.parse(json.d).rows;},
page:function(json){return json.parse(json.d).page;},
total:function(json){return json.parse(json.d).total;},
记录:函数(json){返回json.parse(json.d).records;}
},
serializeGridData:jqGridSettings,
描述:“Usuarios”,
空记述:“不允许使用任何其他文件”,
url:“/GridTest/GridTestService.asmx/GetData”,
ajaxGridOptions:{contentType:'application/json;charset=utf-8'},
数据类型:“json”,
mtype:“POST”,
身高:250,
rowNum:10,
行列表:[10,25,50],
行数:对,
自动宽度:正确,
寻呼机:“#用户呼叫寻呼机”
}).navGrid(“#UsersGridPager”,
{
刷新:是的,
加:错,,
编辑:false,
戴尔:错,
搜索:正确
},
{},
{},
{},
{
sopt:[“eq”、“ne”、“cn”],
多重搜索:对,
showQuery:true
}
);
函数jqGridSettings(p){
变量设置={
网格:{
页面索引:第页,
页面大小:p.rows,
i搜索:p.(u搜索),
SortColumn:p.sidx,
排序者:p.sord,
其中:jqGridFilters(p.filters)
}
};
返回JSON.stringify(设置);
}
函数jqGridFilters(json){
变量过滤器={};
如果(!json){
回来
}
如果(!json.length){
回来
}
var parsed=JSON.parse(JSON);
如果(!!解析的规则){
过滤器=已解析;
}
回流过滤器;
}
});
现在,对于实际实施。。。首先,我们需要两种LINQ扩展方法来对数据进行排序和排序。详情如下:
public static IQueryable<T> OrderBy<T>(this IQueryable<T> query, string sortColumn, string direction)
{
if (string.IsNullOrEmpty(sortColumn))
return query;
string methodName = string.Format("OrderBy{0}",
direction.ToLower() == "asc" ? "" : "descending");
ParameterExpression parameter = Expression.Parameter(query.ElementType, "p");
MemberExpression memberAccess = null;
foreach (var property in sortColumn.Split('.'))
memberAccess = MemberExpression.Property(memberAccess ?? (parameter as Expression), property);
LambdaExpression orderByLambda = Expression.Lambda(memberAccess, parameter);
MethodCallExpression result = Expression.Call(
typeof(Queryable),
methodName,
new[] { query.ElementType, memberAccess.Type },
query.Expression,
Expression.Quote(orderByLambda));
return query.Provider.CreateQuery<T>(result);
}
public static IQueryable<T> Where<T>(this IQueryable<T> query, string column, object value, string operation)
{
if (string.IsNullOrEmpty(column))
return query;
ParameterExpression parameter = Expression.Parameter(query.ElementType, "p");
MemberExpression memberAccess = null;
foreach (var property in column.Split('.'))
memberAccess = MemberExpression.Property
(memberAccess ?? (parameter as Expression), property);
//change param value type
//necessary to getting bool from string
ConstantExpression filter = Expression.Constant
(
Convert.ChangeType(value, memberAccess.Type)
);
//switch operation
LambdaExpression lambda = null;
switch (operation)
{
case "eq": // equal
{
lambda = Expression.Lambda(Expression.Equal(memberAccess, filter), parameter);
break;
}
case "ne": // not equal
{
lambda = Expression.Lambda(Expression.NotEqual(memberAccess, filter), parameter);
break;
}
case "cn": // contains
{
Expression condition = Expression.Call(memberAccess,
typeof (string).GetMethod("Contains"),
Expression.Constant(value.ToString()));
lambda = Expression.Lambda(condition, parameter);
break;
}
}
var result = Expression.Call(
typeof(Queryable), "Where",
new[] { query.ElementType },
query.Expression,
lambda);
return query.Provider.CreateQuery<T>(result);
}
public静态IQueryable OrderBy(此IQueryable查询,字符串sortColumn,字符串方向)
{
if(string.IsNullOrEmpty(sortColumn))
返回查询;
string methodName=string.Format(“OrderBy{0}”,
direction.ToLower()=“asc”?:“下行”);
ParameterExpression参数=Expression.parameter(query.ElementType,“p”);
MemberExpression memberAccess=null;
foreach(sortColumn.Split('.')中的var属性)
memberAccess=MemberExpression.Property(memberAccess???(参数作为表达式),Property);
LambdaExpression orderByLambda=Expression.Lambda(memberAccess,参数);
MethodCallExpression结果=表达式.Call(
类型(
public static IQueryable<T> OrderBy<T>(this IQueryable<T> query, string sortColumn, string direction)
{
if (string.IsNullOrEmpty(sortColumn))
return query;
string methodName = string.Format("OrderBy{0}",
direction.ToLower() == "asc" ? "" : "descending");
ParameterExpression parameter = Expression.Parameter(query.ElementType, "p");
MemberExpression memberAccess = null;
foreach (var property in sortColumn.Split('.'))
memberAccess = MemberExpression.Property(memberAccess ?? (parameter as Expression), property);
LambdaExpression orderByLambda = Expression.Lambda(memberAccess, parameter);
MethodCallExpression result = Expression.Call(
typeof(Queryable),
methodName,
new[] { query.ElementType, memberAccess.Type },
query.Expression,
Expression.Quote(orderByLambda));
return query.Provider.CreateQuery<T>(result);
}
public static IQueryable<T> Where<T>(this IQueryable<T> query, string column, object value, string operation)
{
if (string.IsNullOrEmpty(column))
return query;
ParameterExpression parameter = Expression.Parameter(query.ElementType, "p");
MemberExpression memberAccess = null;
foreach (var property in column.Split('.'))
memberAccess = MemberExpression.Property
(memberAccess ?? (parameter as Expression), property);
//change param value type
//necessary to getting bool from string
ConstantExpression filter = Expression.Constant
(
Convert.ChangeType(value, memberAccess.Type)
);
//switch operation
LambdaExpression lambda = null;
switch (operation)
{
case "eq": // equal
{
lambda = Expression.Lambda(Expression.Equal(memberAccess, filter), parameter);
break;
}
case "ne": // not equal
{
lambda = Expression.Lambda(Expression.NotEqual(memberAccess, filter), parameter);
break;
}
case "cn": // contains
{
Expression condition = Expression.Call(memberAccess,
typeof (string).GetMethod("Contains"),
Expression.Constant(value.ToString()));
lambda = Expression.Lambda(condition, parameter);
break;
}
}
var result = Expression.Call(
typeof(Queryable), "Where",
new[] { query.ElementType },
query.Expression,
lambda);
return query.Provider.CreateQuery<T>(result);
}
public string SerializeQuery<T>(IQueryable<T> query, Func<T, List<string>> select)
{
//filtering
if (IsSearch && Where.rules != null)
{
if (Where.groupOp == "AND") // TODO: INSENSITIVE EQUALS, Y un enum GridGroupOperation.And.Name()
{
foreach (var rule in Where.rules)
query = query.Where(rule.field, rule.data, rule.op);
}
else if (Where.groupOp == "OR") // TODO: INSENSITIVE EQUALS, Y un enum GridGroupOperation.Or.Name()
{
var temp = (new List<T>()).AsQueryable();
foreach (var rule in Where.rules)
{
var t = query.Where(rule.field, rule.data, rule.op);
temp = temp.Concat(t);
}
//remove repeat records
query = temp.Distinct();
}
}
//sorting
query = query.OrderBy(SortColumn, SortOrder);
//count
var totalCount = query.Count();
//paging
var data = query.Skip((PageIndex - 1) * PageSize).Take(PageSize);
//convert to grid format
var result = new
{
total = (int)Math.Ceiling((double)totalCount / PageSize),
page = PageIndex,
records = totalCount,
rows = data.Select((d, id) => new { id, cell = select(d) }).ToArray()
};
return JsonConvert.SerializeObject(result);
}
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
[ScriptService]
public class GridTestService : System.Web.Services.WebService
{
[WebMethod]
[ScriptMethod]
public string GetData(GridSettings grid)
{
var query = new FakeComputersRepository().Computers();
var response = grid.SerializeQuery(query, d => new List<string>
{
d.ID.ToString(),
d.IsOnline.ToString(),
d.Name,
d.IP,
d.User
});
return response;
}
}
public string SerializeQuery<T>(IQueryable<T> query, Func<T, List<string>> select, Func<T, List<int>> ids)
{
//filtering
if (IsSearch && Where.rules != null)
{
if (Where.groupOp == "AND") // TODO: INSENSITIVE EQUALS, Y un enum GridGroupOperation.And.Name()
{
foreach (var rule in Where.rules)
query = query.Where(rule.field, rule.data, rule.op);
}
else if (Where.groupOp == "OR") // TODO: INSENSITIVE EQUALS, Y un enum GridGroupOperation.Or.Name()
{
var temp = (new List<T>()).AsQueryable();
foreach (var rule in Where.rules)
{
var t = query.Where(rule.field, rule.data, rule.op);
temp = temp.Concat(t);
}
//remove repeat records
query = temp.Distinct();
}
}
//sorting
query = query.OrderBy(SortColumn, SortOrder);
//count
var totalCount = query.Count();
//paging
var data = query.Skip((PageIndex - 1) * PageSize).Take(PageSize);
//convert to grid format
var result = new
{
total = (int)Math.Ceiling((double)totalCount / PageSize),
page = PageIndex,
records = totalCount,
rows = data.Select((d) => new {
id = ids(d),
cell = select(d)
}).ToArray()
};
return JsonConvert.SerializeObject(result);
}