entity-framework - 如何实现EntityDataSource Where IN实体sql子句

标签 entity-framework entitydatasource entity-sql

我想将多个值传递给 EntityDataSource 的参数，例如:
Where="it.ORDER_ID IN {@OrderIdList}" (这是 EntityDataSource 上的一个属性)

<WhereParameters>
    <asp:ControlParameter 
       Name="OrderIdList" Type="Int16" 
       ControlID="OrderFilterControl" PropertyName="OrderIdList" 
    />
</WhereParameters>

这不适用于 ORDER_ID是 int32 类型我需要传入多个值，例如{1,2,3} ETC

我尝试的下一件事是设置 Where代码隐藏中的子句，这一切都有效，除了我无法在 DropDownLists 上获得数据绑定(bind)去工作。我的意思是，EntityDataSource 中的绑定(bind)下拉列表没有返回任何值。更新事件。

我理想的解决方案是使用 WhereParameter在 EntityDataSource但任何帮助表示赞赏。谢谢，托尼。

下面是使用 AdventureWorks db 的完整代码示例:
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" />
        &nbsp;<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>

最佳答案

在浪费了很多时间之后，我现在让它工作了!

与 FormView 分页相关的问题以及通过在 Edit 上将 AllowPaging 设置为 False 一切正常。

仅当您在 HTML 中的 FormView 上有以下内容时才会发生这种情况:

<PagerSettings Mode="NextPrevious" Position="Top" />

使用默认分页，您看不到问题。

关于entity-framework - 如何实现EntityDataSource Where IN实体sql子句，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2768953/

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