How to implement EntityDataSource Where IN entity sql clause
I want to pass a number of values into a parameter of the EntityDataSource, e.g.:
Where="it.ORDER_ID IN {@OrderIdList}" (this is a property on the EntityDataSource)
<WhereParameters>
<asp:ControlParameter
Name="OrderIdList" Type="Int16"
ControlID="OrderFilterControl" PropertyName="OrderIdList"
/>
</WhereParameters>
This doesn't work as ORDER_ID is of type int32 and I need to pass in multiple values, e.g. {1,2,3} etc
The next thing I tried was setting the Where clause in code-behind and this all works except I can't get data binding on DropDownLists to work. By this I mean no value is returned from the bound dropdownlists in the EntityDataSource Updating Event.
My ideal solution would be to use a WhereParameter on the EntityDataSource but any help is appreciated. Thanks, Tony.
A complete code example follows using the AdventureWorks db:
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("WhereC开发者_高级运维lause")
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>
After many wasted hours I now have it working!
The problem related to FormView paging and by setting AllowPaging to False on Edit everything was ok.
This only occurs when you have the following on the FormView in the HTML:
<PagerSettings Mode="NextPrevious" Position="Top" />
With default paging you don't see the problem.
Alternate work-around below, if paging is disabled and your still having an issue:
Private Sub DetailsView1_ModeChanged(sender As Object, e As System.EventArgs) Handles DetailsView1.ModeChanged
EntityDataSource1.Where = "it.[ID]=" & Me.lstFilter.SelectedValue ' DetailView.Edit work-around for lost context: Reset bound EntityDataSource.Where
Sub
加载中,请稍侯......
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