匿名类型，取值方法范围 [英] Anonymous type and getting values out side of method scope
本文介绍了匿名类型，取值方法范围的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
1：方法调用表单aspx.cs页面：
helper cls = new helper ）;
var query = cls.GetQuery（GroupID，emailCap）;
2：助手类中的方法：
public IQueryable< VariablesForIQueryble> GetQuery（int incomingGroupID，int incomingEmailCap）
{
var ctx = new some connection_Connection（）;
ObjectSet< Members1> member = ctx.Members11;
ObjectSet< groupMember> groupMembers = ctx.groupMembers;
var query =从成员中的m
在g.MemberID中的groupMembers中加入gmMemberID等于gm.MemID
其中（gm.groupID == incomingGroupID）&& （m.EmailCap == incomingEmailCap）
选择新的VariablesForIQueryble（m.MemberID，m.MemberFirst，m.MemberLast，m.MemberEmail，m.ValidEmail，m.EmailCap）;
// select new {m.MemberID，m.MemberFirst，m.MemberLast，m.MemberEmail，m.ValidEmail，m.EmailCap};
返回查询;
}
我尝试使用IEnumerable的上述代码，没有任何运气。这是类VariablesForIQueryble的代码：
3：对于匿名类型进行类化，并将其转换为适当的类型：
public class VariablesForIQueryble
{
private int _emailCap;
public int EmailCap
{
get {return _emailCap; }
set {_emailCap = value; }
}`....................................
4：和一个构造函数：
public VariablesForIQueryble（int memberID，string memberFirst，string memberLast，string memberEmail，int？validEmail，int？emailCap）
{
this.EmailCap =（int）emailCap;
.........................
}
我似乎无法获得查询结果，首先它告诉我匿名类型的问题，我读了一个类后：链接文本;现在它告诉我的参数不支持的构造函数。现在我是一个中间开发人员，有一个简单的解决方案，或者我必须把我的查询回到.aspx.cs页面。
解决方案
使用反射来解决问题：
A：查询，不使用自定义的VariablesForIQueryble类：
//帮助类中的方法
public IEnumerable GetQuery（int incomingGroupID，int incomingEmailCap）
{
var ctx = new some_Connection（）;
ObjectSet< Members1> member = ctx.Members11;
ObjectSet< groupMember> groupMembers = ctx.groupMembers;
var query = from m in members
join gm in groupMembers on m.MemberID equals gm.MemID
其中（（gm.groupID == incomingGroupID）&&（ m.EmailCap == incomingEmailCap））// select m;
选择新的{m.MemberID，m.MemberFirst，m.MemberLast，m.MemberEmail，m.ValidEmail，m.EmailCap};
//选择新的VariablesForIQueryble（m.MemberID，m.MemberFirst，m.MemberLast，m.MemberEmail，m.ValidEmail，m.EmailCap）;
//列表< object> lst = new List< object>（）;
// foreach（查询中的var i）
// {
// lst.Add（i.MemberEmail）;
//}
// return lst;
// return query.Select（x => new {x.MemberEmail，x.MemberID，x.ValidEmail，x.MemberFirst，x.MemberLast}）ToList（）;
返回查询;
}
B：使用反射捕获对象和转换这些对象的代码
helper cls = new helper（）;
var query = cls.GetQuery（GroupID，emailCap）;
if（query！= null）
{
foreach（查询中的var objRow）
{
System.Type type = objRow .GetType（）;
int memberId =（int）type.GetProperty（MemberID）。GetValue（objRow，null）;
string memberEmail =（string）type.GetProperty（MemberEmail）。GetValue（objRow，null）;
}
else
{
其他....
}
I am building an asp.net site in .net framework 4.0, and I am stuck at the method that supposed to call a .cs class and get the query result back here is my method call and method
1: method call form aspx.cs page:
helper cls = new helper();
var query = cls.GetQuery(GroupID,emailCap);
2: Method in helper class:
public IQueryable<VariablesForIQueryble> GetQuery(int incomingGroupID, int incomingEmailCap)
{
var ctx = new some connection_Connection();
ObjectSet<Members1> members = ctx.Members11;
ObjectSet<groupMember> groupMembers = ctx.groupMembers;
var query = from m in members
join gm in groupMembers on m.MemberID equals gm.MemID
where (gm.groupID == incomingGroupID) && (m.EmailCap == incomingEmailCap)
select new VariablesForIQueryble(m.MemberID, m.MemberFirst, m.MemberLast, m.MemberEmail, m.ValidEmail, m.EmailCap);
//select new {m.MemberID, m.MemberFirst, m.MemberLast, m.MemberEmail, m.ValidEmail, m.EmailCap};
return query ;
}
I tried the above code with IEnumerable too without any luck. This is the code for class VariablesForIQueryble:
3:Class it self for taking anonymouse type and cast it to proper types:
public class VariablesForIQueryble
{
private int _emailCap;
public int EmailCap
{
get { return _emailCap; }
set { _emailCap = value; }
}`....................................
4: and a constructor:
public VariablesForIQueryble(int memberID, string memberFirst, string memberLast, string memberEmail, int? validEmail, int? emailCap)
{
this.EmailCap = (int) emailCap;
.........................
}
I can't seem to get the query result back, first it told me anonymous type problem, I made a class after reading this: link text; and now it tells me constructors with parameters not supported. Now I am an intermediate developer, is there an easy solution to this or do I have to take my query back to the .aspx.cs page.
解决方案
Used reflection to solve the problem:
A: Query, not using custom made "VariablesForIQueryble" class any more:
//Method in helper class
public IEnumerable GetQuery(int incomingGroupID, int incomingEmailCap)
{
var ctx = new some_Connection();
ObjectSet<Members1> members = ctx.Members11;
ObjectSet<groupMember> groupMembers = ctx.groupMembers;
var query = from m in members
join gm in groupMembers on m.MemberID equals gm.MemID
where ((gm.groupID == incomingGroupID) && (m.EmailCap == incomingEmailCap)) //select m;
select new { m.MemberID, m.MemberFirst, m.MemberLast, m.MemberEmail, m.ValidEmail, m.EmailCap };
//select new VariablesForIQueryble (m.MemberID, m.MemberFirst, m.MemberLast, m.MemberEmail, m.ValidEmail, m.EmailCap);
//List<object> lst = new List<object>();
//foreach (var i in query)
//{
// lst.Add(i.MemberEmail);
//}
//return lst;
//return query.Select(x => new{x.MemberEmail,x.MemberID,x.ValidEmail,x.MemberFirst,x.MemberLast}).ToList();
return query;
}
B:Code to catch objects and conversion of those objects using reflection
helper cls = new helper();
var query = cls.GetQuery(GroupID,emailCap);
if (query != null)
{
foreach (var objRow in query)
{
System.Type type = objRow.GetType();
int memberId = (int)type.GetProperty("MemberID").GetValue(objRow, null);
string memberEmail = (string)type.GetProperty("MemberEmail").GetValue(objRow, null);
}
else
{
something else....
}
这篇关于匿名类型，取值方法范围的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
