接上篇:我的 WPF+EF(DBFirst) 簡單應用開發習慣及EF學習測試(備忘) -- 1html
從Model類庫的 App.Config 把數據庫字符串拷貝出來,放到主程序 App.Config 中:數據庫
<connectionStrings> <add name="DBEntities" connectionString="metadata=res://*/EFDBFirstModel.csdl|res://*/EFDBFirstModel.ssdl|res://*/EFDBFirstModel.msl;provider=System.Data.SqlClient;provider connection string="data source=localhost;initial catalog=AdventureWorks2016;persist security info=True;user id=sa;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" /> </connectionStrings>
注:此前從數據庫中創建模型時選擇的是:在數據庫鏈接字符串裏把密碼隱藏,之後在應用中指定密碼;因此此字符串中密碼是不顯示的;express
在 主程序 App中設置這個完整的帶密碼的字符串,做爲後續鏈接時使用:(後面直接用 App.DBConnectionString 這個靜態字符串屬性便可)ide
using System; using System.Configuration; using System.Data.Common; using System.Data.Entity.Core.EntityClient; using System.Windows; namespace WPF_EF_DBFirst { /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { private static string _db_ConnectionString; /// <summary> /// DB Connection String With Password /// </summary> public static string DBConnectionString { get { if (String.IsNullOrEmpty(_db_ConnectionString)) { var originalConnectionString = ConfigurationManager.ConnectionStrings["DBEntities"].ConnectionString; var entityBuilder = new EntityConnectionStringBuilder(originalConnectionString); var factory = DbProviderFactories.GetFactory(entityBuilder.Provider); var providerBuilder = factory.CreateConnectionStringBuilder(); providerBuilder.ConnectionString = entityBuilder.ProviderConnectionString; providerBuilder.Add("Password", "Your Password"); _db_ConnectionString = providerBuilder.ToString(); } return _db_ConnectionString; } } } }
在 MainWindow 窗口上放第一個測試按鈕:函數
<Button x:Name="ListView" Content="列表顯示" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Click="ListView_Click"/>
在 ListView_Click 事件中,打開準備要新建的 Win_ListView 測試窗口:post
private void ListView_Click(object sender, RoutedEventArgs e) { Win_ListView win_ListView = new Win_ListView(); win_ListView.Owner = this; win_ListView.ShowDialog(); }
新建一個 Win_ListView 測試顯示窗口: (就放一個 TabControl 、一個DataGrid 和一個退回 按鈕) (先準備測試顯示 Person表裏的人名數據)學習
<Window x:Class="WPF_EF_DBFirst.Win_ListView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:WPF_EF_DBFirst" mc:Ignorable="d" Title="Win_ListView" Height="326.341" Width="455.122" Loaded="Window_Loaded" WindowState="Maximized"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="257*"/> <RowDefinition Height="38"/> </Grid.RowDefinitions> <TabControl Margin="6,3,3,3"> <TabItem Header="Person"> <Grid Background="#FFE5E5E5"> <DataGrid Margin="3,3,3,3" x:Name="dg_Person" AutoGenerateColumns="False" IsReadOnly="True"> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding FirstName}" Header="FirstName" ElementStyle="{StaticResource DataGridTextCenter}"/> <DataGridTextColumn Binding="{Binding MiddleName}" Header="MiddleName" ElementStyle="{StaticResource DataGridTextCenter}"/> <DataGridTextColumn Binding="{Binding LastName}" Header="LastName" ElementStyle="{StaticResource DataGridTextCenter}"/> </DataGrid.Columns> </DataGrid> </Grid> </TabItem> <TabItem Header="TabItem"> <Grid Background="#FFE5E5E5"/> </TabItem> </TabControl> <Button x:Name="btBack" Content="Back" HorizontalAlignment="Right" Margin="0,3,3,0" Grid.Row="1" VerticalAlignment="Top" Width="75" Click="btBack_Click"/> </Grid> </Window>
Win_ListView中增長實體定義(簡單測試就直接在本窗口內進行數據鏈接了)以及增長 2個事件處理:(一個是Windows Load 一個是 退出按鈕);測試
using System.Linq; using System.Windows; using WPF_EF_DBFirst.Model; namespace WPF_EF_DBFirst { /// <summary> /// Interaction logic for Win_ListView.xaml /// </summary> public partial class Win_ListView : Window { private DBEntities DB; public Win_ListView() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { DB = new DBEntities(); DB.Database.Connection.ConnectionString = App.DBConnectionString; dg_Person.ItemsSource = DB.Person.ToList(); } private void btBack_Click(object sender, RoutedEventArgs e) { Close(); } } }
運行結果:ui
在主窗口隨便加個測試按鈕,而後爲按鈕事件加上如下代碼:this
private void ListReadTest_Click(object sender, RoutedEventArgs e) { try { DBEntities DB = new DBEntities(); DB.Database.Connection.ConnectionString = App.DBConnectionString; MessageBox.Show(DB.Address.First().AddressLine1); } catch (Exception ex) { MessageBox.Show(ex.Message); } }
很是簡單的代碼,就是直接讀取 Address 表的第一條記錄的 AddressLine1 列的數據;
直接運行,點擊這個按鈕後會彈出如下錯誤:
(Spatial types and functions are not available for this provider because the assmbly 'Microsoft.SqlServer.Types' version 10 or higher could not be found.)
以爲挺奇怪的,本機 是安裝了 VS2017 + SQL Server 2016 的,爲何會出現這個錯誤;
一樣,若是這個時候把 Bin目錄 拷貝到其餘PC運行,一樣也會出現這個錯誤;(若是是SQL Server 2012 就不會有這個錯誤。)
具體原理確實不是很清楚。。。
我的經過查詢參考相關帖子,而後用瞭如下解決方法:
在Model類庫中對 數據庫上下文類的構造函數中加入強制定義:(在本機上就能夠直接執行,若是要發佈到其餘PC運行,則須要拷貝SQL Server 2016 對應的Microsoft.SqlServer.Types.dll 到應用程序根目錄)
public DBEntities() : base("name=DBEntities") { SqlProviderServices.SqlServerTypesAssemblyName = "Microsoft.SqlServer.Types, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"; }
注:這樣作也有個小問題,好像每次若是數據庫更新要刷新這個Model的時候,這行代碼可能會自動消失,還要手動再拷貝進來;
這樣就能夠正確取出數據:
Step3