4
我想传递一个数值进入EntityDataSource的参数，如：如何实现EntityDataSource凡在实体SQL子句
Where="it.ORDER_ID IN {@OrderIdList}"（这是对EntityDataSource属性）
<WhereParameters>
<asp:ControlParameter
Name="OrderIdList" Type="Int16"
ControlID="OrderFilterControl" PropertyName="OrderIdList"
/>
</WhereParameters>
这不起作用ORDER_ID是int32类型，我需要传递多个值，例如{1,2,3}等
接下来我尝试的是在代码隐藏中设置Where子句，并且除了我无法获得DropDownLists上的数据绑定的工作外，这一切都可行。我的意思是，EntityDataSource更新事件中的绑定下拉列表不会返回任何值。
我理想的解决方案是在EntityDataSource上使用WhereParameter，但任何帮助表示赞赏。谢谢，托尼。
一个完整的代码示例如下使用了AdventureWorks数据库：
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：我做了我所能来解决语法高亮，但VB高亮本质上破此网站，黯然。 – Tomalak 2010-05-04 21:37:58