Visual Studio 2008中| Silverlight的3 | SQL Server 2005中| 域服务类| 实体数据模型
我有一个数据库表“学生”的列名字，姓氏，学期，ProgramOfStudy，柱等.......
我们的目标是返回一个总计 （按姓氏的第一个字母分组学生人数）的基础上，在某一学期和Programofstudy所有学生的姓氏的第一个字母。
我是不成功的编写LINQ查询，并想我会尝试使用SQL视图。
- 创建视图（17,000行分组到5000行）。
- 该意见由“LastNameStartsWith”，“总”，“AcademicPeriod”，“的程序代码”的。
- 增加了查看到的.edmx模型
- 写了下面的查询。
作为LINQ的;
public IQueryable GetVw_studentAlphabetSet(int cycleID, string progCode)
{
var query = from s in db.vw_studentAlphabetSet
where ((s.programCode == progCode) && (s.academicPeriod == cycleID))
select s;
return query;
}
当与填充MSSMS参数运行SQL视图筛选到25行报告发生的次数。 AZ，以X为有开始X.没有lastnames未报告
如果一个断点设置在返回查询，则它正确地报告的24实体数量，但每一个实体是相同的。 LastNamesStartsWith = 'A' 和总= 21。
因此，它似乎像过滤工作，但有一个bug。 每个实体应该是唯一的AZ。
如果我增加了。哪里像这样
where (s.programCode == progCode) && (s.academicPeriod == cycleID) && (s.LastNameStartsWith == "B");
生成一个正确的返回。 B，35，200890，BSED-ELED-ED
当使用LINQ的回报元素，我可以用一个可怜的元素。 LastNameStartsWith =“A”和总= 21，但再次乙 - 不返回Z和有总计。 在域服务类，它并报告该元素计为24他们都到哪里去了。 我应该得到即使他们是所有报告A和21 23更多的元素。
那么，有没有什么可以欣赏和LINQ工作时，特别应该知道吗？
在这里，设计师为实体模型
[assembly: global::System.Data.Objects.DataClasses.EdmSchemaAttribute()]
// Original file name:
// Generation date: 2/21/2010 10:25:00 PM
namespace sproc.Web
{
///
/// There are no comments for GLADYS_2010Entities in the schema.
///
public partial class GLADYS_2010Entities : global::System.Data.Objects.ObjectContext
{
///
/// Initializes a new GLADYS_2010Entities object using the connection string found in the 'GLADYS_2010Entities' section of the application configuration file.
///
public GLADYS_2010Entities() :
base("name=GLADYS_2010Entities", "GLADYS_2010Entities")
{
this.OnContextCreated();
}
///
/// Initialize a new GLADYS_2010Entities object.
///
public GLADYS_2010Entities(string connectionString) :
base(connectionString, "GLADYS_2010Entities")
{
this.OnContextCreated();
}
///
/// Initialize a new GLADYS_2010Entities object.
///
public GLADYS_2010Entities(global::System.Data.EntityClient.EntityConnection connection) :
base(connection, "GLADYS_2010Entities")
{
this.OnContextCreated();
}
partial void OnContextCreated();
///
/// There are no comments for vw_studentAlphabet in the schema.
///
public global::System.Data.Objects.ObjectQuery vw_studentAlphabet
{
get
{
if ((this._vw_studentAlphabet == null))
{
this._vw_studentAlphabet = base.CreateQuery("[vw_studentAlphabet]");
}
return this._vw_studentAlphabet;
}
}
private global::System.Data.Objects.ObjectQuery _vw_studentAlphabet;
///
/// There are no comments for vw_studentAlphabet in the schema.
///
public void AddTovw_studentAlphabet(vw_studentAlphabet vw_studentAlphabet)
{
base.AddObject("vw_studentAlphabet", vw_studentAlphabet);
}
}
///
/// There are no comments for GLADYS_2010Model.vw_studentAlphabet in the schema.
///
///
/// academicPeriod
/// programCode
///
[global::System.Data.Objects.DataClasses.EdmEntityTypeAttribute(NamespaceName="GLADYS_2010Model", Name="vw_studentAlphabet")]
[global::System.Runtime.Serialization.DataContractAttribute(IsReference=true)]
[global::System.Serializable()]
public partial class vw_studentAlphabet : global::System.Data.Objects.DataClasses.EntityObject
{
///
/// Create a new vw_studentAlphabet object.
///
/// Initial value of academicPeriod.
/// Initial value of programCode.
public static vw_studentAlphabet Createvw_studentAlphabet(int academicPeriod, string programCode)
{
vw_studentAlphabet vw_studentAlphabet = new vw_studentAlphabet();
vw_studentAlphabet.academicPeriod = academicPeriod;
vw_studentAlphabet.programCode = programCode;
return vw_studentAlphabet;
}
///
/// There are no comments for Property LastNameStartsWith in the schema.
///
[global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute()]
[global::System.Runtime.Serialization.DataMemberAttribute()]
public string LastNameStartsWith
{
get
{
return this._LastNameStartsWith;
}
set
{
this.OnLastNameStartsWithChanging(value);
this.ReportPropertyChanging("LastNameStartsWith");
this._LastNameStartsWith = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, true);
this.ReportPropertyChanged("LastNameStartsWith");
this.OnLastNameStartsWithChanged();
}
}
private string _LastNameStartsWith;
partial void OnLastNameStartsWithChanging(string value);
partial void OnLastNameStartsWithChanged();
///
/// There are no comments for Property Total in the schema.
///
[global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute()]
[global::System.Runtime.Serialization.DataMemberAttribute()]
public global::System.Nullable Total
{
get
{
return this._Total;
}
set
{
this.OnTotalChanging(value);
this.ReportPropertyChanging("Total");
this._Total = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value);
this.ReportPropertyChanged("Total");
this.OnTotalChanged();
}
}
private global::System.Nullable _Total;
partial void OnTotalChanging(global::System.Nullable value);
partial void OnTotalChanged();
///
/// There are no comments for Property academicPeriod in the schema.
///
[global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
[global::System.Runtime.Serialization.DataMemberAttribute()]
public int academicPeriod
{
get
{
return this._academicPeriod;
}
set
{
this.OnacademicPeriodChanging(value);
this.ReportPropertyChanging("academicPeriod");
this._academicPeriod = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value);
this.ReportPropertyChanged("academicPeriod");
this.OnacademicPeriodChanged();
}
}
private int _academicPeriod;
partial void OnacademicPeriodChanging(int value);
partial void OnacademicPeriodChanged();
///
/// There are no comments for Property programCode in the schema.
///
[global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
[global::System.Runtime.Serialization.DataMemberAttribute()]
public string programCode
{
get
{
return this._programCode;
}
set
{
this.OnprogramCodeChanging(value);
this.ReportPropertyChanging("programCode");
this._programCode = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, false);
this.ReportPropertyChanged("programCode");
this.OnprogramCodeChanged();
}
}
private string _programCode;
partial void OnprogramCodeChanging(string value);
partial void OnprogramCodeChanged();
}
}
这里是客户端代码调用域服务和实体模型。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Ria.Data;
using GLADYS.Web.GladysDataLayers;
using GLADYS.Web.GladysServices;
namespace GLADYS
{
public partial class uc_AlphabetFilter : UserControl
{
//data context for getting the data through the ria service.
private dscStudents ctx = new dscStudents();
public uc_AlphabetFilter()
{
InitializeComponent();
//Loaded += new RoutedEventHandler(uc_AlphabetFilter_Loaded);
ctx.Load(ctx.GetVw_studentAlphabetSetQuery(200980, "BSED-ELED-ED")).Completed += new EventHandler(uc_AlphabetFilter_Completed);
}
void uc_AlphabetFilter_Completed(object sender, EventArgs e)
{
foreach (var q in ctx.vw_studentAlphabets)
{
uc_AlphaButton btn = new uc_AlphaButton();
btn.pAlphaLetter = q.LastNameStartsWith;
btn.PNumber = q.Total.Value;
myWrapPanel.Children.Add(btn);
}
}
同样的问题被问在这里 ，而是通过不同的方法。
