4
Я хочу передать несколько значений в параметре EntityDataSource, например:Как реализовать EntityDataSource Где в предложении SQL объекта
Where="it.ORDER_ID IN {@OrderIdList}" (это свойство на EntityDataSource)
<WhereParameters>
<asp:ControlParameter
Name="OrderIdList" Type="Int16"
ControlID="OrderFilterControl" PropertyName="OrderIdList"
/>
</WhereParameters>
Это не работает, так как ORDER_ID имеет тип int32 и должен быть отправлен несколькими значениями, например {1,2,3} и т. Д.
Следующее, что я пробовал, заключалось в установке предложения Where в коде, и все это работает, за исключением того, что я не могу получить привязку данных к DropDownLists для работы. Под этим я подразумеваю, что никакое значение не возвращается из списка dropdownlists в обновляющем событии EntityDataSource.
Моим идеальным решением было бы использовать WhereParameter на EntityDataSource, но любая помощь будет оценена. Спасибо, Тони.
Полный пример кода следующим образом, используя AdventureWorks дб:
Public Class EntityDataSourceWhereInClause
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
CustomersEntityDataSource.Where = WhereClause ''# reset after each postback as its lost otherwise
End Sub
Private Sub cmdFilterCustomers_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdFilterCustomers.Click
Dim CustomerIdList As New Generic.List(Of Int32)
For Each item As ListItem In CustomerIdCheckBoxList.Items
If item.Selected Then
CustomerIdList.Add(item.Value)
End If
Next
Dim CustomerCsvList As String = String.Join(", ", CustomerIdList.Select(Function(o) o.ToString()).ToArray())
WhereClause = "it.CustomerID IN {" & CustomerCsvList & "}"
CustomersEntityDataSource.Where = WhereClause
FormView1.PageIndex = 0
End Sub
''# save between postbacks the custom Where IN clause
Public Property WhereClause() As String
Get
Return ViewState("WhereClause")
End Get
Set(ByVal value As String)
ViewState.Add("WhereClause", value)
End Set
End Property
Private Sub CustomersEntityDataSource_Updating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.EntityDataSourceChangingEventArgs) Handles CustomersEntityDataSource.Updating
Dim c = CType(e.Entity, EntityFrameworkTest.Customer)
If c.Title.Length = 0 Then
Response.Write("Title is empty string, so will save like this!")
End If
End Sub
End Class
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="EntityDataSourceWhereInClause.aspx.vb"
Inherits="EntityFrameworkTest.EntityDataSourceWhereInClause" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<%''# filter control %>
<div>
<asp:EntityDataSource ID="CustomerIdListEntityDataSource" runat="server" ConnectionString="name=AdventureWorksLT2008Entities"
DefaultContainerName="AdventureWorksLT2008Entities" EnableFlattening="False"
EntitySetName="Customers" Select="it.[CustomerID]" OrderBy="it.[CustomerID]">
</asp:EntityDataSource>
<asp:CheckBoxList ID="CustomerIdCheckBoxList" runat="server" DataSourceID="CustomerIdListEntityDataSource"
DataTextField="CustomerID" DataValueField="CustomerID" RepeatDirection="Horizontal">
</asp:CheckBoxList>
<asp:Button ID="cmdFilterCustomers" runat="server" Text="Apply Filter" />
</div>
<%
''# you get this error passing in CSV in the where clause
''# The element type 'Edm.Int32' and the CollectionType 'Transient.collection[Edm.String(Nullable=True,DefaultValue=,MaxLength=,Unicode=,FixedLength=)]' are not compatible. The IN expression only supports entity, primitive, and reference types. Near WHERE predicate, line 6, column 15.
''# so have coded it manually in code-behind Where="it.CustomerID IN {@OrderIdList}"
%>
<asp:EntityDataSource ID="CustomersEntityDataSource" runat="server" ConnectionString="name=AdventureWorksLT2008Entities"
DefaultContainerName="AdventureWorksLT2008Entities" EnableFlattening="False"
EnableUpdate="True" EntitySetName="Customers"
AutoGenerateOrderByClause="false">
</asp:EntityDataSource>
<%''# updating works with DropDownLists until the Where clause is set in code %>
<asp:FormView ID="FormView1" runat="server" AllowPaging="True" CellPadding="4" DataKeyNames="CustomerID"
DataSourceID="CustomersEntityDataSource" ForeColor="#333333">
<EditItemTemplate>
CustomerID:
<asp:Label ID="CustomerIDLabel1" runat="server" Text='<%# Eval("CustomerID") %>' />
<br />
NameStyle:
<asp:CheckBox ID="NameStyleCheckBox" runat="server" Checked='<%# Bind("NameStyle") %>' />
<br />
Title:
<%''# the SelectedValue is not Bound to the EF object if the Where clause is updated in code-behind %>
<asp:DropDownList ID="ddlTitleBound" runat="server" DataSourceID="TitleEntityDataSource"
DataTextField="Title" DataValueField="Title" AutoPostBack="false" AppendDataBoundItems="true"
SelectedValue='<%# Bind("Title") %>'>
</asp:DropDownList>
<asp:EntityDataSource ID="TitleEntityDataSource" runat="server" ConnectionString="name=AdventureWorksLT2008Entities"
DefaultContainerName="AdventureWorksLT2008Entities" EnableFlattening="False"
EntitySetName="Customers" Select="it.[Title]" GroupBy="it.[Title]" ViewStateMode="Enabled">
</asp:EntityDataSource>
<br />
FirstName:
<asp:TextBox ID="FirstNameTextBox" runat="server" Text='<%# Bind("FirstName") %>' />
<br />
MiddleName:
<asp:TextBox ID="MiddleNameTextBox" runat="server" Text='<%# Bind("MiddleName") %>' />
<br />
LastName:
<asp:TextBox ID="LastNameTextBox" runat="server" Text='<%# Bind("LastName") %>' />
<br />
Suffix:
<asp:TextBox ID="SuffixTextBox" runat="server" Text='<%# Bind("Suffix") %>' />
<br />
CompanyName:
<asp:TextBox ID="CompanyNameTextBox" runat="server" Text='<%# Bind("CompanyName") %>' />
<br />
SalesPerson:
<asp:TextBox ID="SalesPersonTextBox" runat="server" Text='<%# Bind("SalesPerson") %>' />
<br />
EmailAddress:
<asp:TextBox ID="EmailAddressTextBox" runat="server" Text='<%# Bind("EmailAddress") %>' />
<br />
Phone:
<asp:TextBox ID="PhoneTextBox" runat="server" Text='<%# Bind("Phone") %>' />
<br />
PasswordHash:
<asp:TextBox ID="PasswordHashTextBox" runat="server" Text='<%# Bind("PasswordHash") %>' />
<br />
PasswordSalt:
<asp:TextBox ID="PasswordSaltTextBox" runat="server" Text='<%# Bind("PasswordSalt") %>' />
<br />
rowguid:
<asp:TextBox ID="rowguidTextBox" runat="server" Text='<%# Bind("rowguid") %>' />
<br />
ModifiedDate:
<asp:TextBox ID="ModifiedDateTextBox" runat="server" Text='<%# Bind("ModifiedDate") %>' />
<br />
<asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
Text="Update" />
<asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False"
CommandName="Cancel" Text="Cancel" />
</EditItemTemplate>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<ItemTemplate>
CustomerID:
<asp:Label ID="CustomerIDLabel" runat="server" Text='<%# Eval("CustomerID") %>' />
<br />
NameStyle:
<asp:CheckBox ID="NameStyleCheckBox" runat="server" Checked='<%# Bind("NameStyle") %>'
Enabled="false" />
<br />
Title:
<asp:Label ID="TitleLabel" runat="server" Text='<%# Bind("Title") %>' />
<br />
FirstName:
<asp:Label ID="FirstNameLabel" runat="server" Text='<%# Bind("FirstName") %>' />
<br />
MiddleName:
<asp:Label ID="MiddleNameLabel" runat="server" Text='<%# Bind("MiddleName") %>' />
<br />
LastName:
<asp:Label ID="LastNameLabel" runat="server" Text='<%# Bind("LastName") %>' />
<br />
Suffix:
<asp:Label ID="SuffixLabel" runat="server" Text='<%# Bind("Suffix") %>' />
<br />
CompanyName:
<asp:Label ID="CompanyNameLabel" runat="server" Text='<%# Bind("CompanyName") %>' />
<br />
SalesPerson:
<asp:Label ID="SalesPersonLabel" runat="server" Text='<%# Bind("SalesPerson") %>' />
<br />
EmailAddress:
<asp:Label ID="EmailAddressLabel" runat="server" Text='<%# Bind("EmailAddress") %>' />
<br />
Phone:
<asp:Label ID="PhoneLabel" runat="server" Text='<%# Bind("Phone") %>' />
<br />
PasswordHash:
<asp:Label ID="PasswordHashLabel" runat="server" Text='<%# Bind("PasswordHash") %>' />
<br />
PasswordSalt:
<asp:Label ID="PasswordSaltLabel" runat="server" Text='<%# Bind("PasswordSalt") %>' />
<br />
rowguid:
<asp:Label ID="rowguidLabel" runat="server" Text='<%# Bind("rowguid") %>' />
<br />
ModifiedDate:
<asp:Label ID="ModifiedDateLabel" runat="server" Text='<%# Bind("ModifiedDate") %>' />
<br />
<asp:LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit"
Text="Edit" />
</ItemTemplate>
<PagerSettings Position="Top" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
</asp:FormView>
</form>
@Tony: Я сделал все возможное, чтобы исправить подсветку синтаксиса, но VB подсветка неотъемлемо нарушена на этом сайте, к сожалению, , – Tomalak